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STORMWATER MANAGEMENT for 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE SUBDIVISION LEXINGTON, MASSACHUSETTS Prepared for: 12 Summit Road, LLC c/o DND Homes, LLC 271 Lincoln Street, #10 Lexington, Massachusetts 02421 Prepared by: Patriot Engineering 35 Bedford Street, Suite 4 Lexington, Massachusetts 02420 (978) 726-2654 DATE: OCTOBER 18, 2021
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Page 1: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

STORMWATER MANAGEMENT

for

12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE SUBDIVISION

LEXINGTON, MASSACHUSETTS

Prepared for:

12 Summit Road, LLC c/o DND Homes, LLC

271 Lincoln Street, #10 Lexington, Massachusetts 02421

Prepared by:

Patriot Engineering

35 Bedford Street, Suite 4 Lexington, Massachusetts 02420

(978) 726-2654

DATE: OCTOBER 18, 2021

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 1 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

A. Introduction Important: When filling out forms on the computer, use only the tab key to move your cursor - do not use the return key.

A Stormwater Report must be submitted with the Notice of Intent permit application to document compliance with the Stormwater Management Standards. The following checklist is NOT a substitute for the Stormwater Report (which should provide more substantive and detailed information) but is offered here as a tool to help the applicant organize their Stormwater Management documentation for their Report and for the reviewer to assess this information in a consistent format. As noted in the Checklist, the Stormwater Report must contain the engineering computations and supporting information set forth in Volume 3 of the Massachusetts Stormwater Handbook. The Stormwater Report must be prepared and certified by a Registered Professional Engineer (RPE) licensed in the Commonwealth. The Stormwater Report must include:

• The Stormwater Checklist completed and stamped by a Registered Professional Engineer (see page 2) that certifies that the Stormwater Report contains all required submittals.1 This Checklist is to be used as the cover for the completed Stormwater Report.

• Applicant/Project Name • Project Address • Name of Firm and Registered Professional Engineer that prepared the Report • Long-Term Pollution Prevention Plan required by Standards 4-6 • Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan required

by Standard 82 • Operation and Maintenance Plan required by Standard 9

In addition to all plans and supporting information, the Stormwater Report must include a brief narrative describing stormwater management practices, including environmentally sensitive site design and LID techniques, along with a diagram depicting runoff through the proposed BMP treatment train. Plans are required to show existing and proposed conditions, identify all wetland resource areas, NRCS soil types, critical areas, Land Uses with Higher Potential Pollutant Loads (LUHPPL), and any areas on the site where infiltration rate is greater than 2.4 inches per hour. The Plans shall identify the drainage areas for both existing and proposed conditions at a scale that enables verification of supporting calculations.

As noted in the Checklist, the Stormwater Management Report shall document compliance with each of the Stormwater Management Standards as provided in the Massachusetts Stormwater Handbook. The soils evaluation and calculations shall be done using the methodologies set forth in Volume 3 of the Massachusetts Stormwater Handbook. To ensure that the Stormwater Report is complete, applicants are required to fill in the Stormwater Report Checklist by checking the box to indicate that the specified information has been included in the Stormwater Report. If any of the information specified in the checklist has not been submitted, the applicant must provide an explanation. The completed Stormwater Report Checklist and Certification must be submitted with the Stormwater Report.

1 The Stormwater Report may also include the Illicit Discharge Compliance Statement required by Standard 10. If not included in the Stormwater Report, the Illicit Discharge Compliance Statement must be submitted prior to the discharge of stormwater runoff to the post-construction best management practices. 2 For some complex projects, it may not be possible to include the Construction Period Erosion and Sedimentation Control Plan in the Stormwater Report. In that event, the issuing authority has the discretion to issue an Order of Conditions that approves the project and includes a condition requiring the proponent to submit the Construction Period Erosion and Sedimentation Control Plan before commencing any land disturbance activity on the site.

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 2 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

B. Stormwater Checklist and Certification The following checklist is intended to serve as a guide for applicants as to the elements that ordinarily

need to be addressed in a complete Stormwater Report. The checklist is also intended to provide conservation commissions and other reviewing authorities with a summary of the components necessary for a comprehensive Stormwater Report that addresses the ten Stormwater Standards. Note: Because stormwater requirements vary from project to project, it is possible that a complete Stormwater Report may not include information on some of the subjects specified in the Checklist. If it is determined that a specific item does not apply to the project under review, please note that the item is not applicable (N.A.) and provide the reasons for that determination. A complete checklist must include the Certification set forth below signed by the Registered Professional Engineer who prepared the Stormwater Report.

Registered Professional Engineer’s Certification I have reviewed the Stormwater Report, including the soil evaluation, computations, Long-term Pollution

Prevention Plan, the Construction Period Erosion and Sedimentation Control Plan (if included), the Long-term Post-Construction Operation and Maintenance Plan, the Illicit Discharge Compliance Statement (if included) and the plans showing the stormwater management system, and have determined that they have been prepared in accordance with the requirements of the Stormwater Management Standards as further elaborated by the Massachusetts Stormwater Handbook. I have also determined that the information presented in the Stormwater Checklist is accurate and that the information presented in the Stormwater Report accurately reflects conditions at the site as of the date of this permit application.

Registered Professional Engineer Block and Signature

Signature and Date

Checklist

Project Type: Is the application for new development, redevelopment, or a mix of new and redevelopment?

New development

Redevelopment

Mix of New Development and Redevelopment

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 3 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

Checklist (continued) LID Measures: Stormwater Standards require LID measures to be considered. Document what

environmentally sensitive design and LID Techniques were considered during the planning and design of the project:

No disturbance to any Wetland Resource Areas

Site Design Practices (e.g. clustered development, reduced frontage setbacks)

Reduced Impervious Area (Redevelopment Only)

Minimizing disturbance to existing trees and shrubs

LID Site Design Credit Requested:

Credit 1

Credit 2

Credit 3

Use of “country drainage” versus curb and gutter conveyance and pipe

Bioretention Cells (includes Rain Gardens)

Constructed Stormwater Wetlands (includes Gravel Wetlands designs)

Treebox Filter

Water Quality Swale

Grass Channel

Green Roof

Other (describe):

Standard 1: No New Untreated Discharges

No new untreated discharges Outlets have been designed so there is no erosion or scour to wetlands and waters of the

Commonwealth

Supporting calculations specified in Volume 3 of the Massachusetts Stormwater Handbook included.

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 4 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

Checklist (continued)

Standard 2: Peak Rate Attenuation Standard 2 waiver requested because the project is located in land subject to coastal storm flowage

and stormwater discharge is to a wetland subject to coastal flooding. Evaluation provided to determine whether off-site flooding increases during the 100-year 24-hour

storm.

Calculations provided to show that post-development peak discharge rates do not exceed pre-development rates for the 2-year and 10-year 24-hour storms. If evaluation shows that off-site flooding increases during the 100-year 24-hour storm, calculations are also provided to show that post-development peak discharge rates do not exceed pre-development rates for the 100-year 24-hour storm.

Standard 3: Recharge

Soil Analysis provided.

Required Recharge Volume calculation provided.

Required Recharge volume reduced through use of the LID site Design Credits.

Sizing the infiltration, BMPs is based on the following method: Check the method used.

Static Simple Dynamic Dynamic Field1

Runoff from all impervious areas at the site discharging to the infiltration BMP.

Runoff from all impervious areas at the site is not discharging to the infiltration BMP and calculations

are provided showing that the drainage area contributing runoff to the infiltration BMPs is sufficient to generate the required recharge volume.

Recharge BMPs have been sized to infiltrate the Required Recharge Volume.

Recharge BMPs have been sized to infiltrate the Required Recharge Volume only to the maximum extent practicable for the following reason:

Site is comprised solely of C and D soils and/or bedrock at the land surface

M.G.L. c. 21E sites pursuant to 310 CMR 40.0000

Solid Waste Landfill pursuant to 310 CMR 19.000

Project is otherwise subject to Stormwater Management Standards only to the maximum extent practicable.

Calculations showing that the infiltration BMPs will drain in 72 hours are provided.

Property includes a M.G.L. c. 21E site or a solid waste landfill and a mounding analysis is included.

1 80% TSS removal is required prior to discharge to infiltration BMP if Dynamic Field method is used.

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 5 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

Checklist (continued)

Standard 3: Recharge (continued)

The infiltration BMP is used to attenuate peak flows during storms greater than or equal to the 10-year 24-hour storm and separation to seasonal high groundwater is less than 4 feet and a mounding analysis is provided.

Documentation is provided showing that infiltration BMPs do not adversely impact nearby wetland resource areas.

Standard 4: Water Quality

The Long-Term Pollution Prevention Plan typically includes the following: • Good housekeeping practices; • Provisions for storing materials and waste products inside or under cover; • Vehicle washing controls; • Requirements for routine inspections and maintenance of stormwater BMPs; • Spill prevention and response plans; • Provisions for maintenance of lawns, gardens, and other landscaped areas; • Requirements for storage and use of fertilizers, herbicides, and pesticides; • Pet waste management provisions; • Provisions for operation and management of septic systems; • Provisions for solid waste management; • Snow disposal and plowing plans relative to Wetland Resource Areas; • Winter Road Salt and/or Sand Use and Storage restrictions; • Street sweeping schedules; • Provisions for prevention of illicit discharges to the stormwater management system; • Documentation that Stormwater BMPs are designed to provide for shutdown and containment in the

event of a spill or discharges to or near critical areas or from LUHPPL; • Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan; • List of Emergency contacts for implementing Long-Term Pollution Prevention Plan.

A Long-Term Pollution Prevention Plan is attached to Stormwater Report and is included as an attachment to the Wetlands Notice of Intent.

Treatment BMPs subject to the 44% TSS removal pretreatment requirement and the one inch rule for calculating the water quality volume are included, and discharge:

is within the Zone II or Interim Wellhead Protection Area

is near or to other critical areas

is within soils with a rapid infiltration rate (greater than 2.4 inches per hour)

involves runoff from land uses with higher potential pollutant loads.

The Required Water Quality Volume is reduced through use of the LID site Design Credits.

Calculations documenting that the treatment train meets the 80% TSS removal requirement and, if applicable, the 44% TSS removal pretreatment requirement, are provided.

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 6 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

Checklist (continued)

Standard 4: Water Quality (continued)

The BMP is sized (and calculations provided) based on:

The ½” or 1” Water Quality Volume or The equivalent flow rate associated with the Water Quality Volume and documentation is

provided showing that the BMP treats the required water quality volume.

The applicant proposes to use proprietary BMPs, and documentation supporting use of proprietary BMP and proposed TSS removal rate is provided. This documentation may be in the form of the propriety BMP checklist found in Volume 2, Chapter 4 of the Massachusetts Stormwater Handbook and submitting copies of the TARP Report, STEP Report, and/or other third party studies verifying performance of the proprietary BMPs.

A TMDL exists that indicates a need to reduce pollutants other than TSS and documentation showing that the BMPs selected are consistent with the TMDL is provided.

Standard 5: Land Uses With Higher Potential Pollutant Loads (LUHPPLs)

The NPDES Multi-Sector General Permit covers the land use and the Stormwater Pollution

Prevention Plan (SWPPP) has been included with the Stormwater Report.

The NPDES Multi-Sector General Permit covers the land use and the SWPPP will be submitted prior to the discharge of stormwater to the post-construction stormwater BMPs.

The NPDES Multi-Sector General Permit does not cover the land use.

LUHPPLs are located at the site and industry specific source control and pollution prevention measures have been proposed to reduce or eliminate the exposure of LUHPPLs to rain, snow, snow melt and runoff, and been included in the long term Pollution Prevention Plan.

All exposure has been eliminated.

All exposure has not been eliminated and all BMPs selected are on MassDEP LUHPPL list.

The LUHPPL has the potential to generate runoff with moderate to higher concentrations of oil and grease (e.g. all parking lots with >1000 vehicle trips per day) and the treatment train includes an oil grit separator, a filtering bioretention area, a sand filter or equivalent.

Standard 6: Critical Areas

The discharge is near or to a critical area and the treatment train includes only BMPs that MassDEP has approved for stormwater discharges to or near that particular class of critical area.

Critical areas and BMPs are identified in the Stormwater Report.

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 7 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

Checklist (continued)

Standard 7: Redevelopments and Other Projects Subject to the Standards only to the maximum extent practicable

The project is subject to the Stormwater Management Standards only to the maximum Extent Practicable as a:

Limited Project

Small Residential Projects: 5-9 single family houses or 5-9 units in a multi-family development provided there is no discharge that may potentially affect a critical area.

Small Residential Projects: 2-4 single family houses or 2-4 units in a multi-family development with a discharge to a critical area

Marina and/or boatyard provided the hull painting, service and maintenance areas are protected from exposure to rain, snow, snow melt and runoff

Bike Path and/or Foot Path

Redevelopment Project

Redevelopment portion of mix of new and redevelopment.

Certain standards are not fully met (Standard No. 1, 8, 9, and 10 must always be fully met) and an explanation of why these standards are not met is contained in the Stormwater Report.

The project involves redevelopment and a description of all measures that have been taken to improve existing conditions is provided in the Stormwater Report. The redevelopment checklist found in Volume 2 Chapter 3 of the Massachusetts Stormwater Handbook may be used to document that the proposed stormwater management system (a) complies with Standards 2, 3 and the pretreatment and structural BMP requirements of Standards 4-6 to the maximum extent practicable and (b) improves existing conditions.

Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control

A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan must include the following information:

• Narrative; • Construction Period Operation and Maintenance Plan; • Names of Persons or Entity Responsible for Plan Compliance; • Construction Period Pollution Prevention Measures; • Erosion and Sedimentation Control Plan Drawings; • Detail drawings and specifications for erosion control BMPs, including sizing calculations; • Vegetation Planning; • Site Development Plan; • Construction Sequencing Plan; • Sequencing of Erosion and Sedimentation Controls; • Operation and Maintenance of Erosion and Sedimentation Controls; • Inspection Schedule; • Maintenance Schedule; • Inspection and Maintenance Log Form.

A Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan containing the information set forth above has been included in the Stormwater Report.

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21045-swcheck • 04/01/08 Stormwater Report Checklist • Page 8 of 8

Massachusetts Department of Environmental Protection Bureau of Resource Protection - Wetlands Program

Checklist for Stormwater Report

Checklist (continued)

Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control (continued)

The project is highly complex and information is included in the Stormwater Report that explains why it is not possible to submit the Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan with the application. A Construction Period Pollution Prevention and Erosion and Sedimentation Control has not been included in the Stormwater Report but will be submitted before land disturbance begins.

The project is not covered by a NPDES Construction General Permit.

The project is covered by a NPDES Construction General Permit and a copy of the SWPPP is in the Stormwater Report.

The project is covered by a NPDES Construction General Permit but no SWPPP been submitted. The SWPPP will be submitted BEFORE land disturbance begins.

Standard 9: Operation and Maintenance Plan

The Post Construction Operation and Maintenance Plan is included in the Stormwater Report and includes the following information:

Name of the stormwater management system owners;

Party responsible for operation and maintenance;

Schedule for implementation of routine and non-routine maintenance tasks;

Plan showing the location of all stormwater BMPs maintenance access areas;

Description and delineation of public safety features;

Estimated operation and maintenance budget; and

Operation and Maintenance Log Form.

The responsible party is not the owner of the parcel where the BMP is located and the Stormwater Report includes the following submissions:

A copy of the legal instrument (deed, homeowner’s association, utility trust or other legal entity) that establishes the terms of and legal responsibility for the operation and maintenance of the project site stormwater BMPs;

A plan and easement deed that allows site access for the legal entity to operate and maintain BMP functions.

Standard 10: Prohibition of Illicit Discharges

The Long-Term Pollution Prevention Plan includes measures to prevent illicit discharges;

An Illicit Discharge Compliance Statement is attached;

NO Illicit Discharge Compliance Statement is attached but will be submitted prior to the discharge of any stormwater to post-construction BMPs.

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Stormwater Management Standards Project Narrative: The project site is comprised of a single-family lot located within the Residential (RS) District. The parcel is identified on the Town of Lexington Assessor’s Map 22 as Lot 146A. The subject property has an area of 76,070 s.f., and site features currently existing include a single-family dwelling, a bituminous concrete driveway, walkways, patios, grassed/landscaped areas and wooded areas. The applicant is proposing to subdivide the above-mentioned lot into a Public Benefit Special Permit Residential Subdivision as constructed per Town of Lexington Zoning Bylaw. This proposal utilizes conventional stormwater management techniques including area/trench drains (with sumps), isolator rows and subsurface infiltration systems for the treatment and mitigation of stormwater. The following is a summary of how the proposed project meets the DEP Stormwater Standards: Standard 1: No new stormwater conveyances may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth. There are no untreated stormwater conveyances proposed to discharge to wetlands or waters of the Commonwealth from the project. Standard 2: Peak Rate Attenuation - Stormwater management systems shall be designed so that post-development peak discharge rates do not exceed pre-development peak discharge rates. This standard may be waived for discharges to land subject to coastal storm flowage as defined in 310 CMR 10.04. For the purpose of analyzing pre and post development stormwater peak rates of runoff, three (3) design points have been selected based on existing topographic conditions which were used for both the pre and the post peak rate calculations. The design points are Summit Road to the west, 8 Summit Road to the north, and Bridal Path to the east. The storm event rainfall frequencies used for this analysis have been selected based upon the Extreme Precipitation Tables for the Northeast Regional Climate Center. A full detail of peak rate attenuation along with supplemental stormwater calculations utilizing HydroCAD as well as pre and post drainage site plans have been submitted with the Definitive Subdivision Application. The details of this report will show that the peak rates of runoff for the 2-year, 10-year and 100-year events have been either maintained or reduced from pre to post conditions through the use of area/trench drains (with sumps), isolator rows and subsurface infiltration systems. The hydrologic calculations from the HydroCAD® have been included in this report and are located in section tab entitled “Hydrologic Calculations”.

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2

Proposed Design Points and Subcatchment Areas Design Point #1 (DP#1) is Summit Road to the west. The contributing area to the Design Point consists of Subcatchment 1 & 101. Design Point #1:

Storm Event Existing Conditions (Pre) Peak Flow (CFS)

Proposed Conditions (Post) Peak Flow (CFS)

2-Year (3.2 in./hr.) 0.06 0.01

10-Year (4.8 in./hr.) 0.52 0.19

100-Year (8.8 in./hr.) 2.66 1.44 Design Point #2 (DP#2) is the abutting bordering property to the north, 8 Summit Road. The contributing area to the Design Point consists of Subcatchment 2 & 201. Design Point #2:

Storm Event Existing Conditions (Pre) Peak Flow (CFS)

Proposed Conditions (Post) Peak Flow (CFS)

2-Year (3.2 in./hr.) 0.00 0.00

10-Year (4.8 in./hr.) 0.00 0.00

100-Year (8.8 in./hr.) 0.02 0.02 Design Point #3 (DP#3) is the Bridal Path to the east. The contributing area to the Design Point consists of Subcatchment 3 & 301. Design Point #3:

Storm Event Existing Conditions (Pre) Peak Flow (CFS)

Proposed Conditions (Post) Peak Flow (CFS)

2-Year (3.2 in./hr.) 0.00 0.00

10-Year (4.8 in./hr.) 0.02 0.01

100-Year (8.8 in./hr.) 1.23 0.80 Standard 3: Recharge - Loss of annual recharge to groundwater shall be eliminated or minimized…at a minimum, the annual recharge from the post-development site shall approximate the annual recharge from pre-development conditions based on soil type. This standard is met when the stormwater

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management system is designed to infiltrate the required recharge volume in accordance with the Mass Stormwater Handbook. Loss of annual recharge to groundwater has been minimized through the use of stormwater Best Management Practices (BMP’s), subsurface infiltration systems, and a proposed operation and maintenance program are proposed for this project. The subsurface infiltration systems have been designed for recharging groundwater. Based on soil maps provided by U.S. Department of Agriculture Soil Conservation Service (map located in the Appendix to the narrative) the site consists of one soil type with a hydrologic group of A. Onsite soil testing was conducted by Patriot Engineering on December 21, 2020 in the areas depicted on the attached plan. This testing revealed a mix of sandy loam and loamy sand parent material. Ledge was encountered in a number of the pits. Groundwater was observed in one test pit at a depth of 72”, groundwater was not observed in the other two test pit locations; therefore, the bottom of those test pits have been used as the estimated seasonal high groundwater elevation for design purposes. Utilizing the current regulations, the proposed design will meet this standard as per the following calculation:

Rv = Fx Rv = Required Recharge Volume F = Target Depth Factor associated with hydrologic soil groups located in table 2.3.2 in Volume 3 of the Stormwater Management Handbook x = Total impervious area proposed

Impervious area within project area (HSG A): 22,549 square feet (sf). Required recharge volume depth factor for A type soils: 0.6 inches

Therefore Rv = (22,549)(0.6inches/12 inches per foot) Rv = 1,127 cubic feet (cf)

The proposed subsurface infiltration system provides a total recharge storage volume of 6,668 cf. In accordance with the Stormwater Handbook, a capture area adjustment calculation has been provided in the appendix of this report to ensure a minimum of 65% of the site impervious areas are directed into recharge facilities. The calculation demonstrates the proposed project directs 70% of the site's proposed impervious surface areas will be directed toward the recharge facility. Standard 4: Water Quality – Stormwater management systems shall be designed to remove 80% of the average annual post-construction load of Total Suspended Solids (TSS). The standard is met with pollution prevention plans, stormwater BMP’s sized to capture required water quality volume, and pretreatment measures.

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The stormwater management system has been designed to remove a minimum of 80% of the average annual post-construction load of Total Suspended Solids (TSS). TSS Removal Calculation Worksheets are included in the Stormwater Analysis and Calculations Report noted herein. These percentages have been achieved by the use of deep sump catch basins, isolator rows and a subsurface infiltration system. The Stormwater Management Handbook assigns TSS removal percentages to each treatment BMP. Each treatment BMP is sized to capture the required water quality volume as calculated in accordance with the Handbook in order to achieve the assigned TSS removal rates. General Equation from Stormwater Management Handbook

Vwq = (Dwq)(A) Vwq = required water quality volume Dwq = water quality depth (1” for critical areas, 0.5” for non-critical areas) A = impervious area

The following are treatment sizing calculations for portions of the treatment trains based on the 0.5’’ for non-critical areas: Train 1+2 (Area/Trench Drains to Isolator Row to PSIS)

Vwq = (22,549)(0.5”/12) = 940 cf The proposed subsurface infiltration systems provide a total recharge storage volume of 4,984 cf.

A separate document entitled “Operation and Maintenance & Erosion and Sedimentation Control Program for a Proposed Stormwater Management System” is included as part of this report. Suitable practices for source control and long-term pollution prevention have been identified and shall be implemented as discussed. The utilization of pretreatment and treatment BMP’s combined with the operation and maintenance plan provides compliance with this standard. Standard 5: Land Uses with Higher Potential Pollutant Loads (LUHPPLs) – Source control and pollution prevention shall be implemented in accordance with the Stormwater Handbook to eliminate or reduce the discharge of stormwater runoff from such land uses to the maximum extent practicable. Stormwater Standard 5 is not applicable to this project. The proposed development will not subject the site to higher potential pollutant loads as defined in the Massachusetts Department of Environmental protection Wetlands and Water Quality Regulations. LUHPPLs are identified in 310 CMR 22.20B(2) and C(2)(a)-(k) and (m) and CMR 22.21(2)(a)(1)-(8) and (b)(1)-(6), areas within a site that are the location of activities that are subject to an individual National Pollutant Discharge Elimination System (NPDES) permit or the NPDES Multi-sector General Permit; auto fueling facilities, exterior fleet storage areas, exterior vehicle service and equipment cleaning areas; marinas and

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boatyards; parking lots with high-intensity-use; confined disposal facilities and disposal sites. Standard 6: Critical Areas – Stormwater discharges to critical areas require the use of specific source control and pollution prevention measures and specific structural stormwater best management practices determined by the Department to be suitable for managing discharges to such areas. Stormwater Standard 6 is not applicable to this project given that proposed stormwater does not discharge near a critical area. Critical areas being Outstanding Resource Waters and Special Resource Waters as designated in 314 CMR 4.0, recharge areas for public water supplies as defined in 310 CMR 22.02, bathing beaches as defined in 105 CMR 445.000, cold-water fisheries and shellfish growing areas as defined in 314 CMR 9.02 and 310 CMR 10.04. The design points are not considered a critical area therefore Standard #6 does not applies to this project. Standard 7: Redevelopments – A redevelopment project is required to meet Standards 1-6 only to the maximum extent practicable. Remaining standards shall be met as well as the project shall improve the existing conditions. Stormwater Standard 7 is not applicable to this project. Within the Stormwater Management Handbook (volume 1 chapter 1 page 20), the definition of a redevelopment project includes, “development, rehabilitation, expansion and phased projects on previously developed sites, provided the redevelopment results in no net increase in impervious area”. This project will not result in a reduction of impervious area in the proposed conditions. Standard 8: Construction Period Pollution Prevention and Erosion and Sedimentation Control Plan shall be implemented. An Operation and Maintenance & Erosion and Sediment Control Program for a Proposed Stormwater Management System is included with this report. The program details the construction period operation and maintenance plan and sequencing for pollution prevention measures and erosion and sedimentation controls. Locations of erosion control measures for the project are depicted on the site plan set accompanying this report. Standard 9: A long term Operation and Maintenance Plan shall be implemented. An Operation and Maintenance & Erosion and Sediment Control Program for a Proposed Stormwater Management System is included with this report. The long term operation and maintenance section of the program provides details and the schedule for routine and non-routine maintenance tasks to be implemented at the completion of the project. Standard 10: Prohibition of Illicit Discharges – Illicit discharges to the stormwater management system are prohibited. Illicit discharges to the stormwater management system are discharges that are not entirely comprised of stormwater. Discharges to the stormwater management system

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from the following activities or facilities are permissible: Firefighting, water line flushing, landscape irrigation, uncontaminated groundwater, potable water sources, foundation drains, air conditioning condensation, footing drains, individual resident car washing, flows from riparian habitats and wetlands, dechlorinated water from swimming pools, water used for street washing and water used to clean residential buildings without detergents. All other illicit discharges are prohibited. There are no known illicit discharges anticipated through the completion of this project. During construction and post construction procedures are provided to dissipate the potential for illicit discharges to the drainage system. Post construction preventions of illicit discharges are described in the Operation and Maintenance Program under the Good Housekeeping Practices section of the report.

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STORMWATER ANALYSIS & CALCULATIONS

for

12 SUMMIT ROAD PUBLIC BENEFIT DEFINITIVE SUBDIVISION

LEXINGTON, MASSACHUSETTS

Prepared for:

12 Summit Road, LLC c/o DND Homes, LLC

271 Lincoln Street, #10 Lexington, Massachusetts 02421

Prepared by:

Patriot Engineering

35 Bedford Street, Suite 4 Lexington, Massachusetts 02420

(978) 726-2654

Date: October 18, 2021

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TABLE OF CONTENTS

Calculation Methods

Source of Data Report Summary

Stormwater Analysis: * Existing Conditions • Watershed Routing Diagram • 2-Year 24 Hour Storm Event Analysis

• 10-Year 24 Hour Storm Event Analysis • 100-Year 24 Hour Storm Event Analysis

* Proposed Conditions • Watershed Routing Diagram

• 2-Year 24 Hour Storm Event Analysis • 10-Year 24 Hour Storm Event Analysis • 100-Year 24 Hour Storm Event Analysis

Appendix: * Pre-Development Drainage Plan * Post-Development Drainage Plan *

* * * *

NRCS – Soils Map TSS Calculation Capture Area Adjustment 72-Hour Draw Down Calculations Operation & Maintenance Program

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CALCULATION METHODS

− TR 20 SCS Unit Hydrograph Procedure − Runoff Curve Numbers − Time of Concentration by TR55 Methodology − Reach and Pond Rating by the Storage-Indication Method − Manning Equation

SOURCE OF DATA

− Technical Report No. 20

− Technical Report No. 55 − Extreme Precipitation Tables for the Northeast Regional

Climate Center − Field Survey and Soil Testing by Meridian Associates, Inc. − Massachusetts Stormwater Handbook February 2008

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REPORT SUMMARY: This project proposes to create a special permit residential development through the process outlined in Chapter 135-6.9.3 of the Lexington Zoning Bylaw. Calculation Objective The purpose of this drainage analysis is to design a stormwater management system that maintains and/or reduces the peak rates and volumes of stormwater runoff from pre-development conditions in the post development conditions for the 2, 10 and 100-year design storm events The proposed stormwater management system designed for this project will consist of the installation of four (4) subsurface infiltration system to allow for the mitigation of the runoff from the proposed impervious areas within the project right of way. The installation of the subsurface infiltration systems will allow the development to not have an increase in stormwater runoff (rate or volume) from the site during the 2, 10 and 100-year design storms. Classification of Soils Existing soil conditions within the limits of the watershed analyzed for this study have been categorized as:

• Charlton-Urban Land-Hollis Complex, Hydrologic Group A The classification is based upon the Natural Resource Conservation Service Maps dated May 1984. A copy of this soil map is contained in the Appendix of this report. Onsite soil testing was conducted by Patriot Engineering, Inc. on December 21, 2020 in the areas depicted on the attached plan. This testing revealed a mix of sandy loam and loamy sand parent material. Groundwater was observed in one test pit at a depth of 72”, groundwater was not observed in the other two test pit locations; therefore, the bottom of those test pits have been used as the estimated seasonal high groundwater elevation for design purposes. Selection of Storm Events The storm event frequencies and intensities have been selected based upon the Lexington Stormwater Management Regulations. The storm event rainfall frequencies used for this analysis have been selected based upon the Extreme Precipitation Tables for the Northeast Regional Climate Center. Rainfall frequency data has been provided as follows:

Frequency Rainfall [24 hour event (inch)]

2 year

3.2 10 year 4.8 100 year 8.8

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Existing Site Overview The project site is comprised of a single-family lot located within the Residential (RS) District. The parcel is identified on the Town of Lexington Assessor’s Map 22 as Lot 146A. The subject property has an area of 76,070 s.f., and site features currently existing include a single-family dwelling, a bituminous concrete driveway, walkways, patios, grassed/landscaped areas and wooded areas. The slope of the existing site promotes overland runoff in three (3) main directions: westerly toward Summit Road, northerly to the abutting property (8 Summit Road), and easterly toward Bridle Path. This result in three (3) subcatchments (SC) and three (3) design points (DP):

• Subcatchment SC-1 – This subcatchment area consists of portions of the existing single-family dwelling, driveway, grassed and wooded areas. Stormwater runoff generated in this subcatchment flows west to Summit Road to design point 1 (DP1).

• Subcatchment SC-2 – This subcatchment area consists of lawn and wooded

areas. Stormwater runoff generated in this subcatchment flows north to the abutting property at 8 Summit Road to design point 2 (DP2).

• Subcatchment SC-3 – This subcatchment area consists of portions of the

existing single-family dwelling, driveway, exposed ledge, grassed and wooded areas. Stormwater runoff generated in this subcatchment flows east to Bridal Path to design point 3 (DP3).

Proposed Site Overview The proposed project is comprised of a Public Benefit Special Permit Subdivision development of the existing property into a six-unit development. The development proposes four (4) new single-family dwellings, along with converting the existing dwelling into a two-unit duplex, which will be served by a shared driveway and consist of stormwater management systems, new utilities and associated grassed/landscaped areas. This project will be subject to the Lexington Stormwater Management Regulations as the subdivision disturbs more than one (1) acre of land. Four drainage systems have been designed in order to manage stormwater runoff in an appropriate and responsible manner. The proposed project has been developed with the intent of maintaining the existing drainage patterns of the site to the maximum extent practicable. In order to not increase runoff from the project site runoff from a portion of the proposed development will be directed to subsurface infiltration systems. The seven (7) subcatchments in the post construction scenario are as follows:

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• Subcatchment SC101 – This subcatchment area consists of portions of the proposed proposed roof area, driveway/walkways and grassed areas. Stormwater runoff generated in this subcatchment flows west to Summit Road to design point 1 (DP1).

• Subcatchment SC201 – This subcatchment area consists of lawn and wooded areas. Stormwater runoff generated in this subcatchment flows north to the abutting property at 8 Summit Road to design point 2 (DP2).

• Subcatchment SC301 – This subcatchment area consists of proposed roof area and lawn/wooded areas. Stormwater runoff generated in this subcatchment flows east to Bridal Path to design point 3 (DP3).

• Subcatchment SC401 – This subcatchment area consists of portions of the

proposed impervious area (driveway, walkways, etc.) and lawn areas. Stormwater runoff generated in this subcatchment will be directed to proposed subsurface infiltration system (PSIS-1), with an isolator row, via area drains with sumps.

• Subcatchment SC501 – This subcatchment area consists of portions of the proposed impervious area (roadway, sidewalk, driveway aprons) and lawn areas. Stormwater runoff generated in this subcatchment will be directed to proposed subsurface infiltration system (PSIS-2), with an isolator row, via area drains with sumps.

• Subcatchment SC601 – This subcatchment area consists of portions of the

proposed roof area. Stormwater runoff generated in this subcatchment will be directed to proposed subsurface infiltration system (PSIS-3) via a gutters and downspouts.

• Subcatchment SC701 – This subcatchment area consists of portions of the proposed roof area. Stormwater runoff generated in this subcatchment will be directed to proposed subsurface infiltration system (PSIS-4) via a gutters and downspouts.

Summary of Flows at the Design Point Design Point 1 (DP1): Peak Rates (CFS)

DP1 2-Year Storm

10-Year Storm

100-Year Storm

Existing 0.06 0.52 2.66 Proposed 0.01 0.19 1.44

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Peak Volumes (CF)

DP1 2-Year Storm

10-Year Storm

100-Year Storm

Existing 599 2,211 8,644 Proposed 225 1,073 4,823

Design Point 2 (DP2): Peak Rates (CFS)

DP2 2-Year Storm

10-Year Storm

100-Year Storm

Existing 0.00 0.00 0.02 Proposed 0.00 0.00 0.02

Peak Volumes (CF)

DP2 2-Year Storm

10-Year Storm

100-Year Storm

Existing 0 1 157 Proposed 0 1 157

Design Point 3 (DP3): Peak Rates (CFS)

DP3 2-Year Storm

10-Year Storm

100-Year Storm

Existing 0.00 0.02 1.23 Proposed 0.00 0.01 0.80

Peak Volumes (CF)

DP3 2-Year

Storm 10-Year Storm

100-Year Storm

Existing 1 553 5,176 Proposed 0 334 3,549

Conclusion The calculations for each of the selected Design Points demonstrate that proposed site improvements will not result in an increase in the peak rate or volume of stormwater runoff for the 2-year, 10-year or 100-year 24-hour storm events at the design points with the proposed stormwater mitigation system improvements.

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SC-1

Subcatchment 1

SC-2

Subcatchment 2

SC-3

Subcatchment 3

DP-1

Design Point 1

DP-2

Design Point 2

DP-3

Design Point 3

Routing Diagram for 12 SUMMIT_PREPrepared by {enter your company name here}, Printed 10/18/2021HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Subcat Reach Pond Link

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12 Summit Rd PBH Definitive Pre-Construction Analysis12 SUMMIT_PRE

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Area Listing (all nodes)

Area(sq-ft)

CN Description(subcatchment-numbers)

35,756 39 >75% Grass cover, Good, HSG A (SC-1, SC-2, SC-3)6,551 98 Driveway/Walkways/Patios (SC-1, SC-3)1,385 98 Ledge Outcrop (SC-3)4,339 98 Roof (SC-1, SC-3)

28,039 30 Woods, Good, HSG A (SC-1, SC-2, SC-3)

76,070 45 TOTAL AREA

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 3HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CN

Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method

Runoff Area=32,201 sf 26.53% Impervious Runoff Depth>0.22"Subcatchment SC-1: Subcatchment 1 Tc=6.0 min CN=54 Runoff=0.06 cfs 599 cf

Runoff Area=2,654 sf 0.00% Impervious Runoff Depth=0.00"Subcatchment SC-2: Subcatchment 2 Tc=6.0 min CN=31 Runoff=0.00 cfs 0 cf

Runoff Area=41,215 sf 9.05% Impervious Runoff Depth>0.00"Subcatchment SC-3: Subcatchment 3 Tc=6.0 min CN=39 Runoff=0.00 cfs 1 cf

Inflow=0.06 cfs 599 cfReach DP-1: Design Point 1 Outflow=0.06 cfs 599 cf

Inflow=0.00 cfs 0 cfReach DP-2: Design Point 2 Outflow=0.00 cfs 0 cf

Inflow=0.00 cfs 1 cfReach DP-3: Design Point 3 Outflow=0.00 cfs 1 cf

Total Runoff Area = 76,070 sf Runoff Volume = 600 cf Average Runoff Depth = 0.09"83.86% Pervious = 63,795 sf 16.14% Impervious = 12,275 sf

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 4HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Subcatchment SC-1: Subcatchment 1

Runoff = 0.06 cfs @ 12.36 hrs, Volume= 599 cf, Depth> 0.22" Routed to Reach DP-1 : Design Point 1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description20,282 39 >75% Grass cover, Good, HSG A

3,376 30 Woods, Good, HSG A* 5,254 98 Driveway/Walkways/Patios* 3,289 98 Roof

32,201 54 Weighted Average23,658 73.47% Pervious Area

8,543 26.53% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-1: Subcatchment 1

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.07

0.065

0.06

0.055

0.05

0.045

0.04

0.035

0.03

0.025

0.02

0.015

0.01

0.005

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=32,201 sfRunoff Volume=599 cfRunoff Depth>0.22"Tc=6.0 minCN=54

0.06 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

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Summary for Subcatchment SC-2: Subcatchment 2

Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Depth= 0.00" Routed to Reach DP-2 : Design Point 2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description341 39 >75% Grass cover, Good, HSG A

2,313 30 Woods, Good, HSG A* 0 98 Driveway/Walkways/Patios* 0 98 Roof

2,654 31 Weighted Average2,654 100.00% Pervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-2: Subcatchment 2

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"

Runoff Area=2,654 sfRunoff Volume=0 cfRunoff Depth=0.00"

Tc=6.0 minCN=31

0.00 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

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Summary for Subcatchment SC-3: Subcatchment 3

Runoff = 0.00 cfs @ 24.00 hrs, Volume= 1 cf, Depth> 0.00" Routed to Reach DP-3 : Design Point 3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description15,133 39 >75% Grass cover, Good, HSG A22,350 30 Woods, Good, HSG A

* 1,297 98 Driveway/Walkways/Patios* 1,050 98 Roof* 1,385 98 Ledge Outcrop

41,215 39 Weighted Average37,483 90.95% Pervious Area

3,732 9.05% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-3: Subcatchment 3

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.000

0000000000

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=41,215 sfRunoff Volume=1 cfRunoff Depth>0.00"Tc=6.0 minCN=39

0.00 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

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Summary for Reach DP-1: Design Point 1

Inflow Area = 32,201 sf, 26.53% Impervious, Inflow Depth > 0.22" for 2-Yr 24 Hr eventInflow = 0.06 cfs @ 12.36 hrs, Volume= 599 cfOutflow = 0.06 cfs @ 12.36 hrs, Volume= 599 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-1: Design Point 1

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.07

0.065

0.06

0.055

0.05

0.045

0.04

0.035

0.03

0.025

0.02

0.015

0.01

0.005

0

Inflow Area=32,201 sf0.06 cfs

0.06 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

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Summary for Reach DP-2: Design Point 2

Inflow Area = 2,654 sf, 0.00% Impervious, Inflow Depth = 0.00" for 2-Yr 24 Hr eventInflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cfOutflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-2: Design Point 2

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Inflow Area=2,654 sf

0.00 cfs0.00 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_PRE

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Summary for Reach DP-3: Design Point 3

Inflow Area = 41,215 sf, 9.05% Impervious, Inflow Depth > 0.00" for 2-Yr 24 Hr eventInflow = 0.00 cfs @ 24.00 hrs, Volume= 1 cfOutflow = 0.00 cfs @ 24.00 hrs, Volume= 1 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-3: Design Point 3

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.000

0.000

0.000

0.000

0.000

0.000

0.000

0.000

0

0

0

0

0

Inflow Area=41,215 sf0.00 cfs

0.00 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 10HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CN

Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method

Runoff Area=32,201 sf 26.53% Impervious Runoff Depth>0.82"Subcatchment SC-1: Subcatchment 1 Tc=6.0 min CN=54 Runoff=0.52 cfs 2,211 cf

Runoff Area=2,654 sf 0.00% Impervious Runoff Depth>0.01"Subcatchment SC-2: Subcatchment 2 Tc=6.0 min CN=31 Runoff=0.00 cfs 1 cf

Runoff Area=41,215 sf 9.05% Impervious Runoff Depth>0.16"Subcatchment SC-3: Subcatchment 3 Tc=6.0 min CN=39 Runoff=0.02 cfs 553 cf

Inflow=0.52 cfs 2,211 cfReach DP-1: Design Point 1 Outflow=0.52 cfs 2,211 cf

Inflow=0.00 cfs 1 cfReach DP-2: Design Point 2 Outflow=0.00 cfs 1 cf

Inflow=0.02 cfs 553 cfReach DP-3: Design Point 3 Outflow=0.02 cfs 553 cf

Total Runoff Area = 76,070 sf Runoff Volume = 2,765 cf Average Runoff Depth = 0.44"83.86% Pervious = 63,795 sf 16.14% Impervious = 12,275 sf

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_PRE

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Summary for Subcatchment SC-1: Subcatchment 1

Runoff = 0.52 cfs @ 12.12 hrs, Volume= 2,211 cf, Depth> 0.82" Routed to Reach DP-1 : Design Point 1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description20,282 39 >75% Grass cover, Good, HSG A

3,376 30 Woods, Good, HSG A* 5,254 98 Driveway/Walkways/Patios* 3,289 98 Roof

32,201 54 Weighted Average23,658 73.47% Pervious Area

8,543 26.53% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-1: Subcatchment 1

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=32,201 sfRunoff Volume=2,211 cfRunoff Depth>0.82"Tc=6.0 minCN=54

0.52 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_PRE

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Summary for Subcatchment SC-2: Subcatchment 2

Runoff = 0.00 cfs @ 23.73 hrs, Volume= 1 cf, Depth> 0.01" Routed to Reach DP-2 : Design Point 2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description341 39 >75% Grass cover, Good, HSG A

2,313 30 Woods, Good, HSG A* 0 98 Driveway/Walkways/Patios* 0 98 Roof

2,654 31 Weighted Average2,654 100.00% Pervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-2: Subcatchment 2

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=2,654 sfRunoff Volume=1 cfRunoff Depth>0.01"Tc=6.0 minCN=31

0.00 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_PRE

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Summary for Subcatchment SC-3: Subcatchment 3

Runoff = 0.02 cfs @ 13.67 hrs, Volume= 553 cf, Depth> 0.16" Routed to Reach DP-3 : Design Point 3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description15,133 39 >75% Grass cover, Good, HSG A22,350 30 Woods, Good, HSG A

* 1,297 98 Driveway/Walkways/Patios* 1,050 98 Roof* 1,385 98 Ledge Outcrop

41,215 39 Weighted Average37,483 90.95% Pervious Area

3,732 9.05% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-3: Subcatchment 3

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.0230.0220.021

0.020.0190.0180.0170.0160.0150.0140.0130.0120.011

0.010.0090.0080.0070.0060.0050.0040.0030.0020.001

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=41,215 sfRunoff Volume=553 cfRunoff Depth>0.16"Tc=6.0 minCN=39

0.02 cfs

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Summary for Reach DP-1: Design Point 1

Inflow Area = 32,201 sf, 26.53% Impervious, Inflow Depth > 0.82" for 10-Yr 24 Hr eventInflow = 0.52 cfs @ 12.12 hrs, Volume= 2,211 cfOutflow = 0.52 cfs @ 12.12 hrs, Volume= 2,211 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-1: Design Point 1

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=32,201 sf0.52 cfs

0.52 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_PRE

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Summary for Reach DP-2: Design Point 2

Inflow Area = 2,654 sf, 0.00% Impervious, Inflow Depth > 0.01" for 10-Yr 24 Hr eventInflow = 0.00 cfs @ 23.73 hrs, Volume= 1 cfOutflow = 0.00 cfs @ 23.73 hrs, Volume= 1 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-2: Design Point 2

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Inflow Area=2,654 sf0.00 cfs

0.00 cfs

Page 38: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 16HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Reach DP-3: Design Point 3

Inflow Area = 41,215 sf, 9.05% Impervious, Inflow Depth > 0.16" for 10-Yr 24 Hr eventInflow = 0.02 cfs @ 13.67 hrs, Volume= 553 cfOutflow = 0.02 cfs @ 13.67 hrs, Volume= 553 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-3: Design Point 3

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.0230.0220.021

0.020.0190.0180.0170.0160.0150.0140.0130.0120.011

0.010.0090.0080.0070.0060.0050.0040.0030.0020.001

0

Inflow Area=41,215 sf0.02 cfs

0.02 cfs

Page 39: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 17HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CN

Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method

Runoff Area=32,201 sf 26.53% Impervious Runoff Depth>3.22"Subcatchment SC-1: Subcatchment 1 Tc=6.0 min CN=54 Runoff=2.66 cfs 8,644 cf

Runoff Area=2,654 sf 0.00% Impervious Runoff Depth>0.71"Subcatchment SC-2: Subcatchment 2 Tc=6.0 min CN=31 Runoff=0.02 cfs 157 cf

Runoff Area=41,215 sf 9.05% Impervious Runoff Depth>1.51"Subcatchment SC-3: Subcatchment 3 Tc=6.0 min CN=39 Runoff=1.23 cfs 5,176 cf

Inflow=2.66 cfs 8,644 cfReach DP-1: Design Point 1 Outflow=2.66 cfs 8,644 cf

Inflow=0.02 cfs 157 cfReach DP-2: Design Point 2 Outflow=0.02 cfs 157 cf

Inflow=1.23 cfs 5,176 cfReach DP-3: Design Point 3 Outflow=1.23 cfs 5,176 cf

Total Runoff Area = 76,070 sf Runoff Volume = 13,977 cf Average Runoff Depth = 2.20"83.86% Pervious = 63,795 sf 16.14% Impervious = 12,275 sf

Page 40: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 18HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Subcatchment SC-1: Subcatchment 1

Runoff = 2.66 cfs @ 12.10 hrs, Volume= 8,644 cf, Depth> 3.22" Routed to Reach DP-1 : Design Point 1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description20,282 39 >75% Grass cover, Good, HSG A

3,376 30 Woods, Good, HSG A* 5,254 98 Driveway/Walkways/Patios* 3,289 98 Roof

32,201 54 Weighted Average23,658 73.47% Pervious Area

8,543 26.53% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-1: Subcatchment 1

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

2

1

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=32,201 sfRunoff Volume=8,644 cfRunoff Depth>3.22"Tc=6.0 minCN=54

2.66 cfs

Page 41: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 19HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Subcatchment SC-2: Subcatchment 2

Runoff = 0.02 cfs @ 12.33 hrs, Volume= 157 cf, Depth> 0.71" Routed to Reach DP-2 : Design Point 2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description341 39 >75% Grass cover, Good, HSG A

2,313 30 Woods, Good, HSG A* 0 98 Driveway/Walkways/Patios* 0 98 Roof

2,654 31 Weighted Average2,654 100.00% Pervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-2: Subcatchment 2

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.02

0.019

0.018

0.017

0.016

0.015

0.014

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=2,654 sfRunoff Volume=157 cfRunoff Depth>0.71"Tc=6.0 minCN=31

0.02 cfs

Page 42: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 20HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Subcatchment SC-3: Subcatchment 3

Runoff = 1.23 cfs @ 12.12 hrs, Volume= 5,176 cf, Depth> 1.51" Routed to Reach DP-3 : Design Point 3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description15,133 39 >75% Grass cover, Good, HSG A22,350 30 Woods, Good, HSG A

* 1,297 98 Driveway/Walkways/Patios* 1,050 98 Roof* 1,385 98 Ledge Outcrop

41,215 39 Weighted Average37,483 90.95% Pervious Area

3,732 9.05% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-3: Subcatchment 3

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=41,215 sfRunoff Volume=5,176 cfRunoff Depth>1.51"Tc=6.0 minCN=39

1.23 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 21HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Reach DP-1: Design Point 1

Inflow Area = 32,201 sf, 26.53% Impervious, Inflow Depth > 3.22" for 100-Yr 24 Hr eventInflow = 2.66 cfs @ 12.10 hrs, Volume= 8,644 cfOutflow = 2.66 cfs @ 12.10 hrs, Volume= 8,644 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-1: Design Point 1

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

2

1

0

Inflow Area=32,201 sf2.66 cfs

2.66 cfs

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12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 22HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Reach DP-2: Design Point 2

Inflow Area = 2,654 sf, 0.00% Impervious, Inflow Depth > 0.71" for 100-Yr 24 Hr eventInflow = 0.02 cfs @ 12.33 hrs, Volume= 157 cfOutflow = 0.02 cfs @ 12.33 hrs, Volume= 157 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-2: Design Point 2

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.02

0.019

0.018

0.017

0.016

0.015

0.014

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Inflow Area=2,654 sf0.02 cfs

0.02 cfs

Page 45: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Pre-Construction AnalysisType III 24-hr 100-Yr 24 Hr Rainfall=8.80"12 SUMMIT_PRE

Printed 10/18/2021Prepared by {enter your company name here}Page 23HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Reach DP-3: Design Point 3

Inflow Area = 41,215 sf, 9.05% Impervious, Inflow Depth > 1.51" for 100-Yr 24 Hr eventInflow = 1.23 cfs @ 12.12 hrs, Volume= 5,176 cfOutflow = 1.23 cfs @ 12.12 hrs, Volume= 5,176 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-3: Design Point 3

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Inflow Area=41,215 sf1.23 cfs

1.23 cfs

Page 46: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

SC-101

Subcatchment 101

SC-201

Subcatchment 201

SC-301

Subcatchment 301

SC-401

Subcatchment 401

SC-501

Subcatchment 501

SC-601

Subcatchment 601

SC-701

Subcatchment 701

DP-1

Design Point 1

DP-2

Design Point 2

DP-3

Design Point 3

PSIS-1

Proposed Subsurface Infiltration System-1

PSIS-2

Proposed Subsurface Infiltration System-2

PSIS-3

Proposed Subsurface Infiltration System-3

PSIS-4

Proposed Subsurface Infiltration System-4

Routing Diagram for 12 SUMMIT_BHD_POSTPrepared by {enter your company name here}, Printed 10/18/2021HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Subcat Reach Pond Link

Page 47: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

12 Summit Rd PBH Definitive Post-Construction Analysis12 SUMMIT_BHD_POST

Printed 10/18/2021Prepared by {enter your company name here}Page 2HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Area Listing (all nodes)

Area(sq-ft)

CN Description(subcatchment-numbers)

35,071 39 >75% Grass cover, Good, HSG A (SC-101, SC-201, SC-301, SC-401, SC-501)734 98 Proposed Driveway/Walkway (SC-101)

11,936 98 Proposed Driveway/Walkways (SC-401, SC-501)11,016 98 Proposed Roof Area (SC-101, SC-301, SC-601, SC-701)17,313 30 Woods, Good, HSG A (SC-201, SC-301)

76,070 55 TOTAL AREA

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

Printed 10/18/2021Prepared by {enter your company name here}Page 3HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CN

Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method

Runoff Area=21,051 sf 18.82% Impervious Runoff Depth>0.13"Subcatchment SC-101: Subcatchment 101 Tc=6.0 min CN=50 Runoff=0.01 cfs 225 cf

Runoff Area=2,654 sf 0.00% Impervious Runoff Depth=0.00"Subcatchment SC-201: Subcatchment 201 Tc=6.0 min CN=31 Runoff=0.00 cfs 0 cf

Runoff Area=30,403 sf 5.80% Impervious Runoff Depth=0.00"Subcatchment SC-301: Subcatchment 301 Tc=6.0 min CN=38 Runoff=0.00 cfs 0 cf

Runoff Area=9,831 sf 86.18% Impervious Runoff Depth>2.17"Subcatchment SC-401: Subcatchment 401 Tc=6.0 min CN=90 Runoff=0.56 cfs 1,775 cf

Runoff Area=6,104 sf 56.75% Impervious Runoff Depth>0.93"Subcatchment SC-501: Subcatchment 501 Tc=6.0 min CN=72 Runoff=0.14 cfs 472 cf

Runoff Area=1,839 sf 100.00% Impervious Runoff Depth>2.97"Subcatchment SC-601: Subcatchment 601 Tc=6.0 min CN=98 Runoff=0.13 cfs 454 cf

Runoff Area=4,188 sf 100.00% Impervious Runoff Depth>2.97"Subcatchment SC-701: Subcatchment 701 Tc=6.0 min CN=98 Runoff=0.29 cfs 1,035 cf

Inflow=0.01 cfs 225 cfReach DP-1: Design Point 1 Outflow=0.01 cfs 225 cf

Inflow=0.00 cfs 0 cfReach DP-2: Design Point 2 Outflow=0.00 cfs 0 cf

Inflow=0.00 cfs 0 cfReach DP-3: Design Point 3 Outflow=0.00 cfs 0 cf

Peak Elev=290.73' Storage=723 cf Inflow=0.56 cfs 1,775 cfPond PSIS-1: Proposed Subsurface Infiltration Outflow=0.05 cfs 1,772 cf

Peak Elev=294.31' Storage=89 cf Inflow=0.14 cfs 472 cfPond PSIS-2: Proposed Subsurface Infiltration Outflow=0.04 cfs 472 cf

Peak Elev=290.88' Storage=178 cf Inflow=0.13 cfs 454 cfPond PSIS-3: Proposed Subsurface Infiltration Outflow=0.01 cfs 454 cf

Peak Elev=294.87' Storage=307 cf Inflow=0.29 cfs 1,035 cfPond PSIS-4: Proposed Subsurface Infiltration Outflow=0.04 cfs 1,034 cf

Total Runoff Area = 76,070 sf Runoff Volume = 3,962 cf Average Runoff Depth = 0.62"68.86% Pervious = 52,384 sf 31.14% Impervious = 23,686 sf

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

Printed 10/18/2021Prepared by {enter your company name here}Page 4HydroCAD® 10.10-6a s/n 04881 © 2020 HydroCAD Software Solutions LLC

Summary for Subcatchment SC-101: Subcatchment 101

Runoff = 0.01 cfs @ 12.48 hrs, Volume= 225 cf, Depth> 0.13" Routed to Reach DP-1 : Design Point 1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description17,090 39 >75% Grass cover, Good, HSG A

* 3,227 98 Proposed Roof Area* 734 98 Proposed Driveway/Walkway

21,051 50 Weighted Average17,090 81.18% Pervious Area

3,961 18.82% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-101: Subcatchment 101

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.0130.0130.0120.0110.011

0.010.01

0.0090.0090.0080.0080.0070.0070.0060.0060.0050.0050.0040.0040.0030.0030.0020.0020.0010.0010.000

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=21,051 sfRunoff Volume=225 cfRunoff Depth>0.13"Tc=6.0 minCN=50

0.01 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

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Summary for Subcatchment SC-201: Subcatchment 201

Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Depth= 0.00" Routed to Reach DP-2 : Design Point 2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description341 39 >75% Grass cover, Good, HSG A

2,313 30 Woods, Good, HSG A2,654 31 Weighted Average2,654 100.00% Pervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-201: Subcatchment 201

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"

Runoff Area=2,654 sfRunoff Volume=0 cfRunoff Depth=0.00"

Tc=6.0 minCN=31

0.00 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

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Summary for Subcatchment SC-301: Subcatchment 301

Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Depth= 0.00" Routed to Reach DP-3 : Design Point 3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description13,641 39 >75% Grass cover, Good, HSG A15,000 30 Woods, Good, HSG A

* 1,762 98 Proposed Roof Area30,403 38 Weighted Average28,641 94.20% Pervious Area

1,762 5.80% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-301: Subcatchment 301

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"

Runoff Area=30,403 sfRunoff Volume=0 cfRunoff Depth=0.00"

Tc=6.0 minCN=38

0.00 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

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Summary for Subcatchment SC-401: Subcatchment 401

Runoff = 0.56 cfs @ 12.09 hrs, Volume= 1,775 cf, Depth> 2.17" Routed to Pond PSIS-1 : Proposed Subsurface Infiltration System-1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description1,359 39 >75% Grass cover, Good, HSG A

* 8,472 98 Proposed Driveway/Walkways9,831 90 Weighted Average1,359 13.82% Pervious Area8,472 86.18% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-401: Subcatchment 401

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=9,831 sfRunoff Volume=1,775 cfRunoff Depth>2.17"Tc=6.0 minCN=90

0.56 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

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Summary for Subcatchment SC-501: Subcatchment 501

Runoff = 0.14 cfs @ 12.10 hrs, Volume= 472 cf, Depth> 0.93" Routed to Pond PSIS-2 : Proposed Subsurface Infiltration System-2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description* 3,464 98 Proposed Driveway/Walkways

2,640 39 >75% Grass cover, Good, HSG A6,104 72 Weighted Average2,640 43.25% Pervious Area3,464 56.75% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-501: Subcatchment 501

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.15

0.14

0.13

0.12

0.11

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=6,104 sfRunoff Volume=472 cfRunoff Depth>0.93"Tc=6.0 minCN=72

0.14 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

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Summary for Subcatchment SC-601: Subcatchment 601

Runoff = 0.13 cfs @ 12.09 hrs, Volume= 454 cf, Depth> 2.97" Routed to Pond PSIS-3 : Proposed Subsurface Infiltration System-3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description* 1,839 98 Proposed Roof Area

1,839 100.00% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-601: Subcatchment 601

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.14

0.13

0.12

0.11

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=1,839 sfRunoff Volume=454 cfRunoff Depth>2.97"Tc=6.0 minCN=98

0.13 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 2-Yr 24 Hr Rainfall=3.20"12 SUMMIT_BHD_POST

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Summary for Subcatchment SC-701: Subcatchment 701

Runoff = 0.29 cfs @ 12.09 hrs, Volume= 1,035 cf, Depth> 2.97" Routed to Pond PSIS-4 : Proposed Subsurface Infiltration System-4

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 2-Yr 24 Hr Rainfall=3.20"

Area (sf) CN Description* 3,084 98 Proposed Roof Area* 1,104 98 Proposed Roof Area

4,188 98 Weighted Average4,188 100.00% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-701: Subcatchment 701

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.32

0.3

0.28

0.26

0.24

0.22

0.2

0.18

0.16

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

Type III 24-hr2-Yr 24 Hr Rainfall=3.20"Runoff Area=4,188 sfRunoff Volume=1,035 cfRunoff Depth>2.97"Tc=6.0 minCN=98

0.29 cfs

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Summary for Reach DP-1: Design Point 1

Inflow Area = 21,051 sf, 18.82% Impervious, Inflow Depth > 0.13" for 2-Yr 24 Hr eventInflow = 0.01 cfs @ 12.48 hrs, Volume= 225 cfOutflow = 0.01 cfs @ 12.48 hrs, Volume= 225 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-1: Design Point 1

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Inflow Area=21,051 sf0.01 cfs

0.01 cfs

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Summary for Reach DP-2: Design Point 2

Inflow Area = 2,654 sf, 0.00% Impervious, Inflow Depth = 0.00" for 2-Yr 24 Hr eventInflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cfOutflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-2: Design Point 2

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Inflow Area=2,654 sf

0.00 cfs0.00 cfs

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Summary for Reach DP-3: Design Point 3

Inflow Area = 30,403 sf, 5.80% Impervious, Inflow Depth = 0.00" for 2-Yr 24 Hr eventInflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cfOutflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-3: Design Point 3

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Inflow Area=30,403 sf

0.00 cfs0.00 cfs

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Summary for Pond PSIS-1: Proposed Subsurface Infiltration System-1

Inflow Area = 9,831 sf, 86.18% Impervious, Inflow Depth > 2.17" for 2-Yr 24 Hr eventInflow = 0.56 cfs @ 12.09 hrs, Volume= 1,775 cfOutflow = 0.05 cfs @ 13.13 hrs, Volume= 1,772 cf, Atten= 92%, Lag= 62.5 minDiscarded = 0.05 cfs @ 13.13 hrs, Volume= 1,772 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 290.73' @ 13.13 hrs Surf.Area= 1,858 sf Storage= 723 cf

Plug-Flow detention time= 134.1 min calculated for 1,768 cf (100% of inflow)Center-of-Mass det. time= 132.6 min ( 939.0 - 806.4 )

Volume Invert Avail.Storage Storage Description#1A 290.00' 1,700 cf 34.75'W x 53.46'L x 3.50'H Field A

6,502 cf Overall - 2,251 cf Embedded = 4,251 cf x 40.0% Voids#2A 290.50' 2,251 cf ADS_StormTech SC-740 +Cap x 49 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap49 Chambers in 7 Rows

3,951 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 290.00' 1.020 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.05 cfs @ 13.13 hrs HW=290.73' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)

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Pond PSIS-1: Proposed Subsurface Infiltration System-1 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

7 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 51.46' Row Length +12.0" End Stone x 2 = 53.46' Base Length7 Rows x 51.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 34.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

49 Chambers x 45.9 cf = 2,251.1 cf Chamber Storage

6,501.7 cf Field - 2,251.1 cf Chambers = 4,250.6 cf Stone x 40.0% Voids = 1,700.2 cf Stone Storage

Chamber Storage + Stone Storage = 3,951.3 cf = 0.091 afOverall Storage Efficiency = 60.8%Overall System Size = 53.46' x 34.75' x 3.50'

49 Chambers240.8 cy Field157.4 cy Stone

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Pond PSIS-1: Proposed Subsurface Infiltration System-1

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=9,831 sfPeak Elev=290.73'Storage=723 cf

0.56 cfs

0.05 cfs

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Summary for Pond PSIS-2: Proposed Subsurface Infiltration System-2

Inflow Area = 6,104 sf, 56.75% Impervious, Inflow Depth > 0.93" for 2-Yr 24 Hr eventInflow = 0.14 cfs @ 12.10 hrs, Volume= 472 cfOutflow = 0.04 cfs @ 12.50 hrs, Volume= 472 cf, Atten= 69%, Lag= 23.6 minDiscarded = 0.04 cfs @ 12.50 hrs, Volume= 472 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 294.31' @ 12.50 hrs Surf.Area= 730 sf Storage= 89 cf

Plug-Flow detention time= 13.3 min calculated for 471 cf (100% of inflow)Center-of-Mass det. time= 12.5 min ( 880.6 - 868.0 )

Volume Invert Avail.Storage Storage Description#1A 294.00' 728 cf 21.83'W x 33.43'L x 3.50'H Field A

2,555 cf Overall - 735 cf Embedded = 1,820 cf x 40.0% Voids#2A 294.50' 735 cf ADS_StormTech SC-740 +Cap x 16 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap16 Chambers in 4 Rows

1,463 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 294.00' 2.410 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.04 cfs @ 12.50 hrs HW=294.31' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.04 cfs)

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Pond PSIS-2: Proposed Subsurface Infiltration System-2 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

4 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 30.10' Row Length +20.0" End Stone x 2 = 33.43' Base Length4 Rows x 51.0" Wide + 6.0" Spacing x 3 + 20.0" Side Stone x 2 = 21.83' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

16 Chambers x 45.9 cf = 735.0 cf Chamber Storage

2,554.6 cf Field - 735.0 cf Chambers = 1,819.6 cf Stone x 40.0% Voids = 727.8 cf Stone Storage

Chamber Storage + Stone Storage = 1,462.9 cf = 0.034 afOverall Storage Efficiency = 57.3%Overall System Size = 33.43' x 21.83' x 3.50'

16 Chambers94.6 cy Field67.4 cy Stone

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Pond PSIS-2: Proposed Subsurface Infiltration System-2

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.15

0.14

0.13

0.12

0.11

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0

Inflow Area=6,104 sfPeak Elev=294.31'Storage=89 cf

0.14 cfs

0.04 cfs

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Summary for Pond PSIS-3: Proposed Subsurface Infiltration System-3

Inflow Area = 1,839 sf,100.00% Impervious, Inflow Depth > 2.97" for 2-Yr 24 Hr eventInflow = 0.13 cfs @ 12.09 hrs, Volume= 454 cfOutflow = 0.01 cfs @ 13.07 hrs, Volume= 454 cf, Atten= 92%, Lag= 59.1 minDiscarded = 0.01 cfs @ 13.07 hrs, Volume= 454 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 290.88' @ 13.07 hrs Surf.Area= 366 sf Storage= 178 cf

Plug-Flow detention time= 137.6 min calculated for 454 cf (100% of inflow)Center-of-Mass det. time= 136.5 min ( 892.5 - 756.0 )

Volume Invert Avail.Storage Storage Description#1A 290.00' 365 cf 20.50'W x 17.86'L x 3.50'H Field A

1,281 cf Overall - 368 cf Embedded = 914 cf x 40.0% Voids#2A 290.50' 368 cf ADS_StormTech SC-740 +Cap x 8 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap8 Chambers in 4 Rows

733 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 290.00' 1.020 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.01 cfs @ 13.07 hrs HW=290.88' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)

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Pond PSIS-3: Proposed Subsurface Infiltration System-3 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

2 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 15.86' Row Length +12.0" End Stone x 2 = 17.86' Base Length4 Rows x 51.0" Wide + 6.0" Spacing x 3 + 12.0" Side Stone x 2 = 20.50' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

8 Chambers x 45.9 cf = 367.5 cf Chamber Storage

1,281.2 cf Field - 367.5 cf Chambers = 913.7 cf Stone x 40.0% Voids = 365.5 cf Stone Storage

Chamber Storage + Stone Storage = 733.0 cf = 0.017 afOverall Storage Efficiency = 57.2%Overall System Size = 17.86' x 20.50' x 3.50'

8 Chambers47.5 cy Field33.8 cy Stone

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Pond PSIS-3: Proposed Subsurface Infiltration System-3

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.14

0.13

0.12

0.11

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0

Inflow Area=1,839 sfPeak Elev=290.88'Storage=178 cf

0.13 cfs

0.01 cfs

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Summary for Pond PSIS-4: Proposed Subsurface Infiltration System-4

Inflow Area = 4,188 sf,100.00% Impervious, Inflow Depth > 2.97" for 2-Yr 24 Hr eventInflow = 0.29 cfs @ 12.09 hrs, Volume= 1,035 cfOutflow = 0.04 cfs @ 12.59 hrs, Volume= 1,034 cf, Atten= 85%, Lag= 30.0 minDiscarded = 0.04 cfs @ 12.59 hrs, Volume= 1,034 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 294.87' @ 12.59 hrs Surf.Area= 653 sf Storage= 307 cf

Plug-Flow detention time= 45.6 min calculated for 1,034 cf (100% of inflow)Center-of-Mass det. time= 45.2 min ( 801.1 - 756.0 )

Volume Invert Avail.Storage Storage Description#1A 294.00' 658 cf 12.00'W x 54.46'L x 3.50'H Field A

2,287 cf Overall - 643 cf Embedded = 1,644 cf x 40.0% Voids#2A 294.50' 643 cf ADS_StormTech SC-740 +Cap x 14 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap14 Chambers in 2 Rows

1,301 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 294.00' 2.410 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.04 cfs @ 12.59 hrs HW=294.87' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.04 cfs)

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Pond PSIS-4: Proposed Subsurface Infiltration System-4 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

7 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 51.46' Row Length +18.0" End Stone x 2 = 54.46' Base Length2 Rows x 51.0" Wide + 6.0" Spacing x 1 + 18.0" Side Stone x 2 = 12.00' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

14 Chambers x 45.9 cf = 643.2 cf Chamber Storage

2,287.2 cf Field - 643.2 cf Chambers = 1,644.0 cf Stone x 40.0% Voids = 657.6 cf Stone Storage

Chamber Storage + Stone Storage = 1,300.8 cf = 0.030 afOverall Storage Efficiency = 56.9%Overall System Size = 54.46' x 12.00' x 3.50'

14 Chambers84.7 cy Field60.9 cy Stone

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Pond PSIS-4: Proposed Subsurface Infiltration System-4

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.32

0.3

0.28

0.26

0.24

0.22

0.2

0.18

0.16

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

Inflow Area=4,188 sfPeak Elev=294.87'Storage=307 cf

0.29 cfs

0.04 cfs

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12 Summit Rd PBH Definitive Post-Construction AnalysisType III 24-hr 10-Yr 24 Hr Rainfall=4.80"12 SUMMIT_BHD_POST

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Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CN

Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method

Runoff Area=21,051 sf 18.82% Impervious Runoff Depth>0.61"Subcatchment SC-101: Subcatchment 101 Tc=6.0 min CN=50 Runoff=0.19 cfs 1,073 cf

Runoff Area=2,654 sf 0.00% Impervious Runoff Depth>0.01"Subcatchment SC-201: Subcatchment 201 Tc=6.0 min CN=31 Runoff=0.00 cfs 1 cf

Runoff Area=30,403 sf 5.80% Impervious Runoff Depth>0.13"Subcatchment SC-301: Subcatchment 301 Tc=6.0 min CN=38 Runoff=0.01 cfs 334 cf

Runoff Area=9,831 sf 86.18% Impervious Runoff Depth>3.68"Subcatchment SC-401: Subcatchment 401 Tc=6.0 min CN=90 Runoff=0.92 cfs 3,016 cf

Runoff Area=6,104 sf 56.75% Impervious Runoff Depth>2.04"Subcatchment SC-501: Subcatchment 501 Tc=6.0 min CN=72 Runoff=0.33 cfs 1,039 cf

Runoff Area=1,839 sf 100.00% Impervious Runoff Depth>4.56"Subcatchment SC-601: Subcatchment 601 Tc=6.0 min CN=98 Runoff=0.19 cfs 699 cf

Runoff Area=4,188 sf 100.00% Impervious Runoff Depth>4.56"Subcatchment SC-701: Subcatchment 701 Tc=6.0 min CN=98 Runoff=0.44 cfs 1,592 cf

Inflow=0.19 cfs 1,073 cfReach DP-1: Design Point 1 Outflow=0.19 cfs 1,073 cf

Inflow=0.00 cfs 1 cfReach DP-2: Design Point 2 Outflow=0.00 cfs 1 cf

Inflow=0.01 cfs 334 cfReach DP-3: Design Point 3 Outflow=0.01 cfs 334 cf

Peak Elev=291.23' Storage=1,459 cf Inflow=0.92 cfs 3,016 cfPond PSIS-1: Proposed Subsurface Outflow=0.05 cfs 2,559 cf

Peak Elev=294.85' Storage=336 cf Inflow=0.33 cfs 1,039 cfPond PSIS-2: Proposed Subsurface Infiltration Outflow=0.05 cfs 1,038 cf

Peak Elev=291.41' Storage=315 cf Inflow=0.19 cfs 699 cfPond PSIS-3: Proposed Subsurface Infiltration Outflow=0.01 cfs 621 cf

Peak Elev=295.37' Storage=544 cf Inflow=0.44 cfs 1,592 cfPond PSIS-4: Proposed Subsurface Infiltration Outflow=0.05 cfs 1,591 cf

Total Runoff Area = 76,070 sf Runoff Volume = 7,753 cf Average Runoff Depth = 1.22"68.86% Pervious = 52,384 sf 31.14% Impervious = 23,686 sf

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Summary for Subcatchment SC-101: Subcatchment 101

Runoff = 0.19 cfs @ 12.14 hrs, Volume= 1,073 cf, Depth> 0.61" Routed to Reach DP-1 : Design Point 1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description17,090 39 >75% Grass cover, Good, HSG A

* 3,227 98 Proposed Roof Area* 734 98 Proposed Driveway/Walkway

21,051 50 Weighted Average17,090 81.18% Pervious Area

3,961 18.82% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-101: Subcatchment 101

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.210.2

0.19

0.18

0.17

0.160.15

0.14

0.13

0.120.11

0.1

0.09

0.08

0.070.06

0.05

0.04

0.030.02

0.01

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=21,051 sfRunoff Volume=1,073 cfRunoff Depth>0.61"Tc=6.0 minCN=50

0.19 cfs

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Summary for Subcatchment SC-201: Subcatchment 201

Runoff = 0.00 cfs @ 23.73 hrs, Volume= 1 cf, Depth> 0.01" Routed to Reach DP-2 : Design Point 2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description341 39 >75% Grass cover, Good, HSG A

2,313 30 Woods, Good, HSG A2,654 31 Weighted Average2,654 100.00% Pervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-201: Subcatchment 201

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=2,654 sfRunoff Volume=1 cfRunoff Depth>0.01"Tc=6.0 minCN=31

0.00 cfs

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Summary for Subcatchment SC-301: Subcatchment 301

Runoff = 0.01 cfs @ 14.58 hrs, Volume= 334 cf, Depth> 0.13" Routed to Reach DP-3 : Design Point 3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description13,641 39 >75% Grass cover, Good, HSG A15,000 30 Woods, Good, HSG A

* 1,762 98 Proposed Roof Area30,403 38 Weighted Average28,641 94.20% Pervious Area

1,762 5.80% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-301: Subcatchment 301

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=30,403 sfRunoff Volume=334 cfRunoff Depth>0.13"Tc=6.0 minCN=38

0.01 cfs

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Summary for Subcatchment SC-401: Subcatchment 401

Runoff = 0.92 cfs @ 12.09 hrs, Volume= 3,016 cf, Depth> 3.68" Routed to Pond PSIS-1 : Proposed Subsurface Infiltration System-1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description1,359 39 >75% Grass cover, Good, HSG A

* 8,472 98 Proposed Driveway/Walkways9,831 90 Weighted Average1,359 13.82% Pervious Area8,472 86.18% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-401: Subcatchment 401

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=9,831 sfRunoff Volume=3,016 cfRunoff Depth>3.68"Tc=6.0 minCN=90

0.92 cfs

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Summary for Subcatchment SC-501: Subcatchment 501

Runoff = 0.33 cfs @ 12.10 hrs, Volume= 1,039 cf, Depth> 2.04" Routed to Pond PSIS-2 : Proposed Subsurface Infiltration System-2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description* 3,464 98 Proposed Driveway/Walkways

2,640 39 >75% Grass cover, Good, HSG A6,104 72 Weighted Average2,640 43.25% Pervious Area3,464 56.75% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-501: Subcatchment 501

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.36

0.34

0.32

0.3

0.28

0.26

0.24

0.22

0.2

0.18

0.16

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=6,104 sfRunoff Volume=1,039 cfRunoff Depth>2.04"Tc=6.0 minCN=72

0.33 cfs

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Summary for Subcatchment SC-601: Subcatchment 601

Runoff = 0.19 cfs @ 12.09 hrs, Volume= 699 cf, Depth> 4.56" Routed to Pond PSIS-3 : Proposed Subsurface Infiltration System-3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description* 1,839 98 Proposed Roof Area

1,839 100.00% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-601: Subcatchment 601

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.210.2

0.19

0.18

0.170.16

0.15

0.140.13

0.12

0.11

0.10.09

0.08

0.07

0.060.05

0.04

0.03

0.020.01

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=1,839 sfRunoff Volume=699 cfRunoff Depth>4.56"Tc=6.0 minCN=98

0.19 cfs

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Summary for Subcatchment SC-701: Subcatchment 701

Runoff = 0.44 cfs @ 12.09 hrs, Volume= 1,592 cf, Depth> 4.56" Routed to Pond PSIS-4 : Proposed Subsurface Infiltration System-4

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 10-Yr 24 Hr Rainfall=4.80"

Area (sf) CN Description* 3,084 98 Proposed Roof Area* 1,104 98 Proposed Roof Area

4,188 98 Weighted Average4,188 100.00% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-701: Subcatchment 701

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.480.460.440.42

0.40.380.360.340.32

0.30.280.260.240.22

0.20.180.160.140.12

0.10.080.060.040.02

0

Type III 24-hr10-Yr 24 Hr Rainfall=4.80"Runoff Area=4,188 sfRunoff Volume=1,592 cfRunoff Depth>4.56"Tc=6.0 minCN=98

0.44 cfs

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Summary for Reach DP-1: Design Point 1

Inflow Area = 21,051 sf, 18.82% Impervious, Inflow Depth > 0.61" for 10-Yr 24 Hr eventInflow = 0.19 cfs @ 12.14 hrs, Volume= 1,073 cfOutflow = 0.19 cfs @ 12.14 hrs, Volume= 1,073 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-1: Design Point 1

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.210.2

0.19

0.180.170.160.150.140.130.12

0.110.1

0.090.080.070.060.050.04

0.030.020.01

0

Inflow Area=21,051 sf0.19 cfs

0.19 cfs

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Summary for Reach DP-2: Design Point 2

Inflow Area = 2,654 sf, 0.00% Impervious, Inflow Depth > 0.01" for 10-Yr 24 Hr eventInflow = 0.00 cfs @ 23.73 hrs, Volume= 1 cfOutflow = 0.00 cfs @ 23.73 hrs, Volume= 1 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-2: Design Point 2

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Inflow Area=2,654 sf0.00 cfs

0.00 cfs

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Summary for Reach DP-3: Design Point 3

Inflow Area = 30,403 sf, 5.80% Impervious, Inflow Depth > 0.13" for 10-Yr 24 Hr eventInflow = 0.01 cfs @ 14.58 hrs, Volume= 334 cfOutflow = 0.01 cfs @ 14.58 hrs, Volume= 334 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-3: Design Point 3

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Inflow Area=30,403 sf0.01 cfs

0.01 cfs

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Summary for Pond PSIS-1: Proposed Subsurface Infiltration System-1

Inflow Area = 9,831 sf, 86.18% Impervious, Inflow Depth > 3.68" for 10-Yr 24 Hr eventInflow = 0.92 cfs @ 12.09 hrs, Volume= 3,016 cfOutflow = 0.05 cfs @ 14.24 hrs, Volume= 2,559 cf, Atten= 95%, Lag= 128.8 minDiscarded = 0.05 cfs @ 14.24 hrs, Volume= 2,559 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 291.23' @ 14.24 hrs Surf.Area= 1,858 sf Storage= 1,459 cf

Plug-Flow detention time= 260.6 min calculated for 2,559 cf (85% of inflow)Center-of-Mass det. time= 196.8 min ( 988.4 - 791.6 )

Volume Invert Avail.Storage Storage Description#1A 290.00' 1,700 cf 34.75'W x 53.46'L x 3.50'H Field A

6,502 cf Overall - 2,251 cf Embedded = 4,251 cf x 40.0% Voids#2A 290.50' 2,251 cf ADS_StormTech SC-740 +Cap x 49 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap49 Chambers in 7 Rows

3,951 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 290.00' 1.020 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.05 cfs @ 14.24 hrs HW=291.23' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)

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Pond PSIS-1: Proposed Subsurface Infiltration System-1 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

7 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 51.46' Row Length +12.0" End Stone x 2 = 53.46' Base Length7 Rows x 51.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 34.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

49 Chambers x 45.9 cf = 2,251.1 cf Chamber Storage

6,501.7 cf Field - 2,251.1 cf Chambers = 4,250.6 cf Stone x 40.0% Voids = 1,700.2 cf Stone Storage

Chamber Storage + Stone Storage = 3,951.3 cf = 0.091 afOverall Storage Efficiency = 60.8%Overall System Size = 53.46' x 34.75' x 3.50'

49 Chambers240.8 cy Field157.4 cy Stone

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Pond PSIS-1: Proposed Subsurface Infiltration System-1

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Inflow Area=9,831 sfPeak Elev=291.23'Storage=1,459 cf

0.92 cfs

0.05 cfs

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Summary for Pond PSIS-2: Proposed Subsurface Infiltration System-2

Inflow Area = 6,104 sf, 56.75% Impervious, Inflow Depth > 2.04" for 10-Yr 24 Hr eventInflow = 0.33 cfs @ 12.10 hrs, Volume= 1,039 cfOutflow = 0.05 cfs @ 12.75 hrs, Volume= 1,038 cf, Atten= 86%, Lag= 39.5 minDiscarded = 0.05 cfs @ 12.75 hrs, Volume= 1,038 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 294.85' @ 12.75 hrs Surf.Area= 730 sf Storage= 336 cf

Plug-Flow detention time= 58.8 min calculated for 1,038 cf (100% of inflow)Center-of-Mass det. time= 58.1 min ( 902.2 - 844.0 )

Volume Invert Avail.Storage Storage Description#1A 294.00' 728 cf 21.83'W x 33.43'L x 3.50'H Field A

2,555 cf Overall - 735 cf Embedded = 1,820 cf x 40.0% Voids#2A 294.50' 735 cf ADS_StormTech SC-740 +Cap x 16 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap16 Chambers in 4 Rows

1,463 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 294.00' 2.410 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.05 cfs @ 12.75 hrs HW=294.85' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)

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Pond PSIS-2: Proposed Subsurface Infiltration System-2 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

4 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 30.10' Row Length +20.0" End Stone x 2 = 33.43' Base Length4 Rows x 51.0" Wide + 6.0" Spacing x 3 + 20.0" Side Stone x 2 = 21.83' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

16 Chambers x 45.9 cf = 735.0 cf Chamber Storage

2,554.6 cf Field - 735.0 cf Chambers = 1,819.6 cf Stone x 40.0% Voids = 727.8 cf Stone Storage

Chamber Storage + Stone Storage = 1,462.9 cf = 0.034 afOverall Storage Efficiency = 57.3%Overall System Size = 33.43' x 21.83' x 3.50'

16 Chambers94.6 cy Field67.4 cy Stone

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Pond PSIS-2: Proposed Subsurface Infiltration System-2

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.36

0.34

0.32

0.3

0.28

0.26

0.24

0.22

0.2

0.18

0.16

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

Inflow Area=6,104 sfPeak Elev=294.85'Storage=336 cf

0.33 cfs

0.05 cfs

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Summary for Pond PSIS-3: Proposed Subsurface Infiltration System-3

Inflow Area = 1,839 sf,100.00% Impervious, Inflow Depth > 4.56" for 10-Yr 24 Hr eventInflow = 0.19 cfs @ 12.09 hrs, Volume= 699 cfOutflow = 0.01 cfs @ 13.85 hrs, Volume= 621 cf, Atten= 94%, Lag= 105.6 minDiscarded = 0.01 cfs @ 13.85 hrs, Volume= 621 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 291.41' @ 13.85 hrs Surf.Area= 366 sf Storage= 315 cf

Plug-Flow detention time= 233.9 min calculated for 621 cf (89% of inflow)Center-of-Mass det. time= 180.2 min ( 928.5 - 748.3 )

Volume Invert Avail.Storage Storage Description#1A 290.00' 365 cf 20.50'W x 17.86'L x 3.50'H Field A

1,281 cf Overall - 368 cf Embedded = 914 cf x 40.0% Voids#2A 290.50' 368 cf ADS_StormTech SC-740 +Cap x 8 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap8 Chambers in 4 Rows

733 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 290.00' 1.020 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.01 cfs @ 13.85 hrs HW=291.41' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)

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Pond PSIS-3: Proposed Subsurface Infiltration System-3 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

2 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 15.86' Row Length +12.0" End Stone x 2 = 17.86' Base Length4 Rows x 51.0" Wide + 6.0" Spacing x 3 + 12.0" Side Stone x 2 = 20.50' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

8 Chambers x 45.9 cf = 367.5 cf Chamber Storage

1,281.2 cf Field - 367.5 cf Chambers = 913.7 cf Stone x 40.0% Voids = 365.5 cf Stone Storage

Chamber Storage + Stone Storage = 733.0 cf = 0.017 afOverall Storage Efficiency = 57.2%Overall System Size = 17.86' x 20.50' x 3.50'

8 Chambers47.5 cy Field33.8 cy Stone

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Pond PSIS-3: Proposed Subsurface Infiltration System-3

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.210.2

0.190.180.17

0.160.150.140.130.120.11

0.10.090.080.070.06

0.050.040.030.020.01

0

Inflow Area=1,839 sfPeak Elev=291.41'Storage=315 cf

0.19 cfs

0.01 cfs

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Summary for Pond PSIS-4: Proposed Subsurface Infiltration System-4

Inflow Area = 4,188 sf,100.00% Impervious, Inflow Depth > 4.56" for 10-Yr 24 Hr eventInflow = 0.44 cfs @ 12.09 hrs, Volume= 1,592 cfOutflow = 0.05 cfs @ 12.79 hrs, Volume= 1,591 cf, Atten= 89%, Lag= 42.5 minDiscarded = 0.05 cfs @ 12.79 hrs, Volume= 1,591 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 295.37' @ 12.79 hrs Surf.Area= 653 sf Storage= 544 cf

Plug-Flow detention time= 83.9 min calculated for 1,591 cf (100% of inflow)Center-of-Mass det. time= 83.5 min ( 831.8 - 748.3 )

Volume Invert Avail.Storage Storage Description#1A 294.00' 658 cf 12.00'W x 54.46'L x 3.50'H Field A

2,287 cf Overall - 643 cf Embedded = 1,644 cf x 40.0% Voids#2A 294.50' 643 cf ADS_StormTech SC-740 +Cap x 14 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap14 Chambers in 2 Rows

1,301 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 294.00' 2.410 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.05 cfs @ 12.79 hrs HW=295.37' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.05 cfs)

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Pond PSIS-4: Proposed Subsurface Infiltration System-4 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

7 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 51.46' Row Length +18.0" End Stone x 2 = 54.46' Base Length2 Rows x 51.0" Wide + 6.0" Spacing x 1 + 18.0" Side Stone x 2 = 12.00' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

14 Chambers x 45.9 cf = 643.2 cf Chamber Storage

2,287.2 cf Field - 643.2 cf Chambers = 1,644.0 cf Stone x 40.0% Voids = 657.6 cf Stone Storage

Chamber Storage + Stone Storage = 1,300.8 cf = 0.030 afOverall Storage Efficiency = 56.9%Overall System Size = 54.46' x 12.00' x 3.50'

14 Chambers84.7 cy Field60.9 cy Stone

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Pond PSIS-4: Proposed Subsurface Infiltration System-4

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.480.460.440.42

0.40.380.360.340.32

0.30.280.260.240.22

0.20.180.160.140.12

0.10.080.060.040.02

0

Inflow Area=4,188 sfPeak Elev=295.37'Storage=544 cf

0.44 cfs

0.05 cfs

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Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CN

Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method

Runoff Area=21,051 sf 18.82% Impervious Runoff Depth>2.75"Subcatchment SC-101: Subcatchment 101 Tc=6.0 min CN=50 Runoff=1.44 cfs 4,823 cf

Runoff Area=2,654 sf 0.00% Impervious Runoff Depth>0.71"Subcatchment SC-201: Subcatchment 201 Tc=6.0 min CN=31 Runoff=0.02 cfs 157 cf

Runoff Area=30,403 sf 5.80% Impervious Runoff Depth>1.40"Subcatchment SC-301: Subcatchment 301 Tc=6.0 min CN=38 Runoff=0.80 cfs 3,549 cf

Runoff Area=9,831 sf 86.18% Impervious Runoff Depth>7.59"Subcatchment SC-401: Subcatchment 401 Tc=6.0 min CN=90 Runoff=1.82 cfs 6,217 cf

Runoff Area=6,104 sf 56.75% Impervious Runoff Depth>5.40"Subcatchment SC-501: Subcatchment 501 Tc=6.0 min CN=72 Runoff=0.87 cfs 2,746 cf

Runoff Area=1,839 sf 100.00% Impervious Runoff Depth>8.55"Subcatchment SC-601: Subcatchment 601 Tc=6.0 min CN=98 Runoff=0.36 cfs 1,311 cf

Runoff Area=4,188 sf 100.00% Impervious Runoff Depth>8.55"Subcatchment SC-701: Subcatchment 701 Tc=6.0 min CN=98 Runoff=0.81 cfs 2,986 cf

Inflow=1.44 cfs 4,823 cfReach DP-1: Design Point 1 Outflow=1.44 cfs 4,823 cf

Inflow=0.02 cfs 157 cfReach DP-2: Design Point 2 Outflow=0.02 cfs 157 cf

Inflow=0.80 cfs 3,549 cfReach DP-3: Design Point 3 Outflow=0.80 cfs 3,549 cf

Peak Elev=293.20' Storage=3,730 cf Inflow=1.82 cfs 6,217 cfPond PSIS-1: Proposed Subsurface Outflow=0.06 cfs 3,270 cf

Peak Elev=296.83' Storage=1,264 cf Inflow=0.87 cfs 2,746 cfPond PSIS-2: Proposed Subsurface Outflow=0.06 cfs 2,583 cf

Peak Elev=293.35' Storage=711 cf Inflow=0.36 cfs 1,311 cfPond PSIS-3: Proposed Subsurface Infiltration Outflow=0.01 cfs 841 cf

Peak Elev=297.26' Storage=1,239 cf Inflow=0.81 cfs 2,986 cfPond PSIS-4: Proposed Subsurface Outflow=0.06 cfs 2,940 cf

Total Runoff Area = 76,070 sf Runoff Volume = 21,788 cf Average Runoff Depth = 3.44"68.86% Pervious = 52,384 sf 31.14% Impervious = 23,686 sf

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Summary for Subcatchment SC-101: Subcatchment 101

Runoff = 1.44 cfs @ 12.10 hrs, Volume= 4,823 cf, Depth> 2.75" Routed to Reach DP-1 : Design Point 1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description17,090 39 >75% Grass cover, Good, HSG A

* 3,227 98 Proposed Roof Area* 734 98 Proposed Driveway/Walkway

21,051 50 Weighted Average17,090 81.18% Pervious Area

3,961 18.82% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-101: Subcatchment 101

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=21,051 sfRunoff Volume=4,823 cfRunoff Depth>2.75"Tc=6.0 minCN=50

1.44 cfs

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Summary for Subcatchment SC-201: Subcatchment 201

Runoff = 0.02 cfs @ 12.33 hrs, Volume= 157 cf, Depth> 0.71" Routed to Reach DP-2 : Design Point 2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description341 39 >75% Grass cover, Good, HSG A

2,313 30 Woods, Good, HSG A2,654 31 Weighted Average2,654 100.00% Pervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-201: Subcatchment 201

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.02

0.019

0.018

0.017

0.016

0.015

0.014

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=2,654 sfRunoff Volume=157 cfRunoff Depth>0.71"Tc=6.0 minCN=31

0.02 cfs

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Summary for Subcatchment SC-301: Subcatchment 301

Runoff = 0.80 cfs @ 12.12 hrs, Volume= 3,549 cf, Depth> 1.40" Routed to Reach DP-3 : Design Point 3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description13,641 39 >75% Grass cover, Good, HSG A15,000 30 Woods, Good, HSG A

* 1,762 98 Proposed Roof Area30,403 38 Weighted Average28,641 94.20% Pervious Area

1,762 5.80% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-301: Subcatchment 301

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.85

0.8

0.75

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=30,403 sfRunoff Volume=3,549 cfRunoff Depth>1.40"Tc=6.0 minCN=38

0.80 cfs

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Summary for Subcatchment SC-401: Subcatchment 401

Runoff = 1.82 cfs @ 12.09 hrs, Volume= 6,217 cf, Depth> 7.59" Routed to Pond PSIS-1 : Proposed Subsurface Infiltration System-1

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description1,359 39 >75% Grass cover, Good, HSG A

* 8,472 98 Proposed Driveway/Walkways9,831 90 Weighted Average1,359 13.82% Pervious Area8,472 86.18% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-401: Subcatchment 401

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

2

1

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=9,831 sfRunoff Volume=6,217 cfRunoff Depth>7.59"Tc=6.0 minCN=90

1.82 cfs

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Summary for Subcatchment SC-501: Subcatchment 501

Runoff = 0.87 cfs @ 12.09 hrs, Volume= 2,746 cf, Depth> 5.40" Routed to Pond PSIS-2 : Proposed Subsurface Infiltration System-2

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description* 3,464 98 Proposed Driveway/Walkways

2,640 39 >75% Grass cover, Good, HSG A6,104 72 Weighted Average2,640 43.25% Pervious Area3,464 56.75% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-501: Subcatchment 501

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.95

0.9

0.85

0.8

0.75

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=6,104 sfRunoff Volume=2,746 cfRunoff Depth>5.40"Tc=6.0 minCN=72

0.87 cfs

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Summary for Subcatchment SC-601: Subcatchment 601

Runoff = 0.36 cfs @ 12.09 hrs, Volume= 1,311 cf, Depth> 8.55" Routed to Pond PSIS-3 : Proposed Subsurface Infiltration System-3

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description* 1,839 98 Proposed Roof Area

1,839 100.00% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-601: Subcatchment 601

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.38

0.36

0.34

0.32

0.3

0.28

0.26

0.24

0.22

0.2

0.18

0.16

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=1,839 sfRunoff Volume=1,311 cfRunoff Depth>8.55"Tc=6.0 minCN=98

0.36 cfs

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Summary for Subcatchment SC-701: Subcatchment 701

Runoff = 0.81 cfs @ 12.09 hrs, Volume= 2,986 cf, Depth> 8.55" Routed to Pond PSIS-4 : Proposed Subsurface Infiltration System-4

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType III 24-hr 100-Yr 24 Hr Rainfall=8.80"

Area (sf) CN Description* 3,084 98 Proposed Roof Area* 1,104 98 Proposed Roof Area

4,188 98 Weighted Average4,188 100.00% Impervious Area

Tc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)

6.0 Direct Entry, Min. Engineering Standard

Subcatchment SC-701: Subcatchment 701

Runoff

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.9

0.85

0.8

0.75

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Type III 24-hr100-Yr 24 Hr Rainfall=8.80"Runoff Area=4,188 sfRunoff Volume=2,986 cfRunoff Depth>8.55"Tc=6.0 minCN=98

0.81 cfs

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Summary for Reach DP-1: Design Point 1

Inflow Area = 21,051 sf, 18.82% Impervious, Inflow Depth > 2.75" for 100-Yr 24 Hr eventInflow = 1.44 cfs @ 12.10 hrs, Volume= 4,823 cfOutflow = 1.44 cfs @ 12.10 hrs, Volume= 4,823 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-1: Design Point 1

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

1

0

Inflow Area=21,051 sf1.44 cfs

1.44 cfs

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Summary for Reach DP-2: Design Point 2

Inflow Area = 2,654 sf, 0.00% Impervious, Inflow Depth > 0.71" for 100-Yr 24 Hr eventInflow = 0.02 cfs @ 12.33 hrs, Volume= 157 cfOutflow = 0.02 cfs @ 12.33 hrs, Volume= 157 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-2: Design Point 2

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.02

0.019

0.018

0.017

0.016

0.015

0.014

0.013

0.012

0.011

0.01

0.009

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001

0

Inflow Area=2,654 sf0.02 cfs

0.02 cfs

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Summary for Reach DP-3: Design Point 3

Inflow Area = 30,403 sf, 5.80% Impervious, Inflow Depth > 1.40" for 100-Yr 24 Hr eventInflow = 0.80 cfs @ 12.12 hrs, Volume= 3,549 cfOutflow = 0.80 cfs @ 12.12 hrs, Volume= 3,549 cf, Atten= 0%, Lag= 0.0 min

Routing by Stor-Ind+Trans method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs

Reach DP-3: Design Point 3

InflowOutflow

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.85

0.8

0.75

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=30,403 sf0.80 cfs

0.80 cfs

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Summary for Pond PSIS-1: Proposed Subsurface Infiltration System-1

Inflow Area = 9,831 sf, 86.18% Impervious, Inflow Depth > 7.59" for 100-Yr 24 Hr eventInflow = 1.82 cfs @ 12.09 hrs, Volume= 6,217 cfOutflow = 0.06 cfs @ 15.83 hrs, Volume= 3,270 cf, Atten= 97%, Lag= 224.5 minDiscarded = 0.06 cfs @ 15.83 hrs, Volume= 3,270 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 293.20' @ 15.83 hrs Surf.Area= 1,858 sf Storage= 3,730 cf

Plug-Flow detention time= 279.1 min calculated for 3,270 cf (53% of inflow)Center-of-Mass det. time= 165.5 min ( 938.3 - 772.7 )

Volume Invert Avail.Storage Storage Description#1A 290.00' 1,700 cf 34.75'W x 53.46'L x 3.50'H Field A

6,502 cf Overall - 2,251 cf Embedded = 4,251 cf x 40.0% Voids#2A 290.50' 2,251 cf ADS_StormTech SC-740 +Cap x 49 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap49 Chambers in 7 Rows

3,951 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 290.00' 1.020 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.06 cfs @ 15.83 hrs HW=293.20' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.06 cfs)

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Pond PSIS-1: Proposed Subsurface Infiltration System-1 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

7 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 51.46' Row Length +12.0" End Stone x 2 = 53.46' Base Length7 Rows x 51.0" Wide + 6.0" Spacing x 6 + 12.0" Side Stone x 2 = 34.75' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

49 Chambers x 45.9 cf = 2,251.1 cf Chamber Storage

6,501.7 cf Field - 2,251.1 cf Chambers = 4,250.6 cf Stone x 40.0% Voids = 1,700.2 cf Stone Storage

Chamber Storage + Stone Storage = 3,951.3 cf = 0.091 afOverall Storage Efficiency = 60.8%Overall System Size = 53.46' x 34.75' x 3.50'

49 Chambers240.8 cy Field157.4 cy Stone

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Pond PSIS-1: Proposed Subsurface Infiltration System-1

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

2

1

0

Inflow Area=9,831 sfPeak Elev=293.20'Storage=3,730 cf

1.82 cfs

0.06 cfs

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Summary for Pond PSIS-2: Proposed Subsurface Infiltration System-2

Inflow Area = 6,104 sf, 56.75% Impervious, Inflow Depth > 5.40" for 100-Yr 24 Hr eventInflow = 0.87 cfs @ 12.09 hrs, Volume= 2,746 cfOutflow = 0.06 cfs @ 13.85 hrs, Volume= 2,583 cf, Atten= 93%, Lag= 105.5 minDiscarded = 0.06 cfs @ 13.85 hrs, Volume= 2,583 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 296.83' @ 13.85 hrs Surf.Area= 730 sf Storage= 1,264 cf

Plug-Flow detention time= 227.6 min calculated for 2,577 cf (94% of inflow)Center-of-Mass det. time= 195.8 min ( 1,011.8 - 816.0 )

Volume Invert Avail.Storage Storage Description#1A 294.00' 728 cf 21.83'W x 33.43'L x 3.50'H Field A

2,555 cf Overall - 735 cf Embedded = 1,820 cf x 40.0% Voids#2A 294.50' 735 cf ADS_StormTech SC-740 +Cap x 16 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap16 Chambers in 4 Rows

1,463 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 294.00' 2.410 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.06 cfs @ 13.85 hrs HW=296.83' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.06 cfs)

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Pond PSIS-2: Proposed Subsurface Infiltration System-2 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

4 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 30.10' Row Length +20.0" End Stone x 2 = 33.43' Base Length4 Rows x 51.0" Wide + 6.0" Spacing x 3 + 20.0" Side Stone x 2 = 21.83' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

16 Chambers x 45.9 cf = 735.0 cf Chamber Storage

2,554.6 cf Field - 735.0 cf Chambers = 1,819.6 cf Stone x 40.0% Voids = 727.8 cf Stone Storage

Chamber Storage + Stone Storage = 1,462.9 cf = 0.034 afOverall Storage Efficiency = 57.3%Overall System Size = 33.43' x 21.83' x 3.50'

16 Chambers94.6 cy Field67.4 cy Stone

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Pond PSIS-2: Proposed Subsurface Infiltration System-2

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.95

0.9

0.85

0.8

0.75

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=6,104 sfPeak Elev=296.83'Storage=1,264 cf

0.87 cfs

0.06 cfs

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Summary for Pond PSIS-3: Proposed Subsurface Infiltration System-3

Inflow Area = 1,839 sf,100.00% Impervious, Inflow Depth > 8.55" for 100-Yr 24 Hr eventInflow = 0.36 cfs @ 12.09 hrs, Volume= 1,311 cfOutflow = 0.01 cfs @ 14.94 hrs, Volume= 841 cf, Atten= 96%, Lag= 171.0 minDiscarded = 0.01 cfs @ 14.94 hrs, Volume= 841 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 293.35' @ 14.94 hrs Surf.Area= 366 sf Storage= 711 cf

Plug-Flow detention time= 263.6 min calculated for 841 cf (64% of inflow)Center-of-Mass det. time= 157.3 min ( 896.9 - 739.6 )

Volume Invert Avail.Storage Storage Description#1A 290.00' 365 cf 20.50'W x 17.86'L x 3.50'H Field A

1,281 cf Overall - 368 cf Embedded = 914 cf x 40.0% Voids#2A 290.50' 368 cf ADS_StormTech SC-740 +Cap x 8 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap8 Chambers in 4 Rows

733 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 290.00' 1.020 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.01 cfs @ 14.94 hrs HW=293.35' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.01 cfs)

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Pond PSIS-3: Proposed Subsurface Infiltration System-3 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

2 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 15.86' Row Length +12.0" End Stone x 2 = 17.86' Base Length4 Rows x 51.0" Wide + 6.0" Spacing x 3 + 12.0" Side Stone x 2 = 20.50' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

8 Chambers x 45.9 cf = 367.5 cf Chamber Storage

1,281.2 cf Field - 367.5 cf Chambers = 913.7 cf Stone x 40.0% Voids = 365.5 cf Stone Storage

Chamber Storage + Stone Storage = 733.0 cf = 0.017 afOverall Storage Efficiency = 57.2%Overall System Size = 17.86' x 20.50' x 3.50'

8 Chambers47.5 cy Field33.8 cy Stone

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Pond PSIS-3: Proposed Subsurface Infiltration System-3

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.38

0.36

0.34

0.32

0.3

0.28

0.26

0.24

0.22

0.2

0.18

0.16

0.14

0.12

0.1

0.08

0.06

0.04

0.02

0

Inflow Area=1,839 sfPeak Elev=293.35'Storage=711 cf

0.36 cfs

0.01 cfs

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Summary for Pond PSIS-4: Proposed Subsurface Infiltration System-4

Inflow Area = 4,188 sf,100.00% Impervious, Inflow Depth > 8.55" for 100-Yr 24 Hr eventInflow = 0.81 cfs @ 12.09 hrs, Volume= 2,986 cfOutflow = 0.06 cfs @ 13.18 hrs, Volume= 2,940 cf, Atten= 93%, Lag= 65.5 minDiscarded = 0.06 cfs @ 13.18 hrs, Volume= 2,940 cf

Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsPeak Elev= 297.26' @ 13.18 hrs Surf.Area= 653 sf Storage= 1,239 cf

Plug-Flow detention time= 184.2 min calculated for 2,934 cf (98% of inflow)Center-of-Mass det. time= 173.8 min ( 913.5 - 739.6 )

Volume Invert Avail.Storage Storage Description#1A 294.00' 658 cf 12.00'W x 54.46'L x 3.50'H Field A

2,287 cf Overall - 643 cf Embedded = 1,644 cf x 40.0% Voids#2A 294.50' 643 cf ADS_StormTech SC-740 +Cap x 14 Inside #1

Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap14 Chambers in 2 Rows

1,301 cf Total Available Storage

Storage Group A created with Chamber Wizard

Device Routing Invert Outlet Devices#1 Discarded 294.00' 2.410 in/hr Exfiltration over Wetted area

Discarded OutFlow Max=0.06 cfs @ 13.18 hrs HW=297.26' (Free Discharge)1=Exfiltration (Exfiltration Controls 0.06 cfs)

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Pond PSIS-4: Proposed Subsurface Infiltration System-4 - Chamber Wizard Field A

Chamber Model = ADS_StormTech SC-740 +Cap (ADS StormTech® SC-740 with cap length)Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cfOverall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap

51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing

7 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 51.46' Row Length +18.0" End Stone x 2 = 54.46' Base Length2 Rows x 51.0" Wide + 6.0" Spacing x 1 + 18.0" Side Stone x 2 = 12.00' Base Width6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height

14 Chambers x 45.9 cf = 643.2 cf Chamber Storage

2,287.2 cf Field - 643.2 cf Chambers = 1,644.0 cf Stone x 40.0% Voids = 657.6 cf Stone Storage

Chamber Storage + Stone Storage = 1,300.8 cf = 0.030 afOverall Storage Efficiency = 56.9%Overall System Size = 54.46' x 12.00' x 3.50'

14 Chambers84.7 cy Field60.9 cy Stone

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Pond PSIS-4: Proposed Subsurface Infiltration System-4

InflowDiscarded

Hydrograph

Time (hours)2423222120191817161514131211109876543210

Flo

w (

cfs)

0.9

0.85

0.8

0.75

0.7

0.65

0.6

0.55

0.5

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

Inflow Area=4,188 sfPeak Elev=297.26'Storage=1,239 cf

0.81 cfs

0.06 cfs

Page 117: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

APPENDIX

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SUMMIT ROAD
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2 STORY STUCCO
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NO. 12
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50.2'
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80.6'
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64.4'
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111.5'
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LOT B
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76,070%%PS.F.
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30'SETBACK LINE
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15'SETBACK LINE
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15'SETBACK LINE
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20'SETBACK LINE
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15'SETBACK LINE
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BRIDLE PATH
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15'SETBACK LINE
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QUINT. 7"TREE
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QUINT. 7"TREE
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7"+8"HEM
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16"HEM
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7"HEM
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6"+8"HEM
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9"HEM
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8"+8"HEM
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12"HEM
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30"OAK
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21"OAK
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12"OAK
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12"MAPLE
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8''MAPLE
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24''OAK
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15''+22''OAK
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16"MAPLE
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13"+13"OAK
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11"MAPLE
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9''OAK
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13''MAPLE
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9''OAK
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9''+12''OAK
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21''MAPLE
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8''OAK
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10''OAK
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10''OAK
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14''OAK
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6"+6"+9"HEM
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7''HEM
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7''HEM
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9"HEM
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8''+9''HEM
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7''+8''HEM
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9''+9''HEM
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QUAD.8''HEM
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9''HEM
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S
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SMH
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RIM=291.74(BENCH)
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SMH
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S
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S
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SMH
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RIM=296.34
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BIT. BERM
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BIT. BERM
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UP
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UP
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5''+6"HEM
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9"HEM
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9"HEM
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x
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x
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x
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15''OAK
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13''OAK
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10''MAPLE
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12''OAK
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9"OAK
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CHAIN LINK FENCE
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12''OAK
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20''FIR
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16''OAK
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16''OAK
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22''MAPLE(DEAD)
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7''+8''MAPLE
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13''OAK
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10''MAPLE
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13"MAPLE
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7"+9"MAPLE
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8"CEDAR
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10"MAPLE
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15"MAPLE
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8"CEDAR
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14"CEDAR
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26"SYCAMORE
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TP
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8"HEM
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8"HEM
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6"+6"+8"HEM
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8"SPRUCE
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10"HEM
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13"HEM
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8"HEM
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8"HEM
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12"HEM
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10"HEM
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7"+8"HEM
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8"PINE
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10"PINE
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8"PINE
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TP
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7"CEDAR
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LIGHT
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POST
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36"TREE
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TP
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CONC. WALK
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28"SPRUCE
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7"+8"TREE
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32"OAK
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6"+6"HEM
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PATIO
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PATIO
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PATIO
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CE
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GAS
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9"CEDAR
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10"MAPLE
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LEDGE
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BIT. CONC. DRIVEWAY
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BIT. CONC. DRIVEWAY
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BIT. CONC. DRIVEWAY
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CONC. WALK
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RIM=290.67
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BIT. CONC. DRIVEWAY
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S
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S
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S
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S
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S
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S
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S
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8"SEWER
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INV.=284.97
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INV.=283.32
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8"SEWER
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BATH
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BIRD
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SBDH
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SBDH
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SBDH
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UNDER-
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GROUND
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SHED
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W
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W
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W
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W
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W
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6"WATER
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W
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W
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2"GAS
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OHW
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OHW
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OHW
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OHW
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OHW
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SCALE: 1"= 40'
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LOCATED IN
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PREPARED FOR
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0
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DATE: OCTOBER 18, 2021
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(MIDDLESEX COUNTY)
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LEXINGTON, MASSACHUSETTS
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DRAINAGE PLAN
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40
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20
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80
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20
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PRE-DEVELOPMENT
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%%ULEGEND:
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SC1
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631C
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DP1
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HSG
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OVERLAND FLOW DIRECTION
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SUBCATCHMENT DIVIDE
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SUBCATCHMENT
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DESIGN POINT
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SOIL TYPE
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HYDROLOGIC SOIL GROUP
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12 SUMMIT ROAD
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12 SUMMIT ROAD, LLC.
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SC1
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DP1
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631C
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HSG A
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SC2
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SC3
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DP2
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DP3
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SUMMIT ROAD
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0.00
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PC
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RP
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PC
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0.00
AutoCAD SHX Text
24
AutoCAD SHX Text
IP
AutoCAD SHX Text
0.00
AutoCAD SHX Text
25
AutoCAD SHX Text
SBCTR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
26
AutoCAD SHX Text
SBDH
AutoCAD SHX Text
0.00
AutoCAD SHX Text
35
AutoCAD SHX Text
SBCTR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
41
AutoCAD SHX Text
RECSB
AutoCAD SHX Text
0.00
AutoCAD SHX Text
42
AutoCAD SHX Text
SBCTR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
43
AutoCAD SHX Text
BLDCOR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
44
AutoCAD SHX Text
BLDCOR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
45
AutoCAD SHX Text
BLDCOR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
46
AutoCAD SHX Text
BLDCOR
AutoCAD SHX Text
0.00
AutoCAD SHX Text
47
AutoCAD SHX Text
BLDCOR
AutoCAD SHX Text
S01°48'16"W
AutoCAD SHX Text
87.53'
AutoCAD SHX Text
83.66'
AutoCAD SHX Text
S05°25'12"W
AutoCAD SHX Text
S05°25'12"W
AutoCAD SHX Text
137.23'
AutoCAD SHX Text
R=158.91'
AutoCAD SHX Text
L=64.41'
AutoCAD SHX Text
209.48'
AutoCAD SHX Text
S85°25'04"E
AutoCAD SHX Text
149.02'
AutoCAD SHX Text
N76°17'42"E
AutoCAD SHX Text
64.75'
AutoCAD SHX Text
S80°27'24"E
AutoCAD SHX Text
S21°02'49"W
AutoCAD SHX Text
25.93'
AutoCAD SHX Text
102.50'
AutoCAD SHX Text
S15°23'46"E
AutoCAD SHX Text
48.14'
AutoCAD SHX Text
S78°04'05"E
AutoCAD SHX Text
132.07'
AutoCAD SHX Text
N57°46'32"E
AutoCAD SHX Text
132.00'
AutoCAD SHX Text
S15°57'00"W
AutoCAD SHX Text
R=189.80'
AutoCAD SHX Text
L=31.86'
AutoCAD SHX Text
L=26.04'
AutoCAD SHX Text
R=27.50'
AutoCAD SHX Text
2 STORY STUCCO
AutoCAD SHX Text
NO. 12
AutoCAD SHX Text
50.2'
AutoCAD SHX Text
80.6'
AutoCAD SHX Text
64.4'
AutoCAD SHX Text
111.5'
AutoCAD SHX Text
30'SETBACK LINE
AutoCAD SHX Text
15'SETBACK LINE
AutoCAD SHX Text
15'SETBACK LINE
AutoCAD SHX Text
20'SETBACK LINE
AutoCAD SHX Text
15'SETBACK LINE
AutoCAD SHX Text
BRIDLE PATH
AutoCAD SHX Text
15'SETBACK LINE
AutoCAD SHX Text
302.1
AutoCAD SHX Text
1000
AutoCAD SHX Text
NL
AutoCAD SHX Text
299.2
AutoCAD SHX Text
1001
AutoCAD SHX Text
TPIT
AutoCAD SHX Text
299.5
AutoCAD SHX Text
1002
AutoCAD SHX Text
TPIT
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1003
AutoCAD SHX Text
8HEM
AutoCAD SHX Text
300.8
AutoCAD SHX Text
1004
AutoCAD SHX Text
8HEM
AutoCAD SHX Text
300.9
AutoCAD SHX Text
1005
AutoCAD SHX Text
668HEM
AutoCAD SHX Text
299.9
AutoCAD SHX Text
1006
AutoCAD SHX Text
10HEM
AutoCAD SHX Text
299.7
AutoCAD SHX Text
1007
AutoCAD SHX Text
8SPR
AutoCAD SHX Text
299.6
AutoCAD SHX Text
1008
AutoCAD SHX Text
13HEM
AutoCAD SHX Text
299.2
AutoCAD SHX Text
1009
AutoCAD SHX Text
8HEM
AutoCAD SHX Text
298.3
AutoCAD SHX Text
1010
AutoCAD SHX Text
10HEM
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1011
AutoCAD SHX Text
12HEM
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1012
AutoCAD SHX Text
8HEM
AutoCAD SHX Text
298.2
AutoCAD SHX Text
1013
AutoCAD SHX Text
78HEM
AutoCAD SHX Text
297.9
AutoCAD SHX Text
1014
AutoCAD SHX Text
8P
AutoCAD SHX Text
298.3
AutoCAD SHX Text
1015
AutoCAD SHX Text
10P
AutoCAD SHX Text
297.9
AutoCAD SHX Text
1016
AutoCAD SHX Text
8P
AutoCAD SHX Text
296.9
AutoCAD SHX Text
1017
AutoCAD SHX Text
EP
AutoCAD SHX Text
298.9
AutoCAD SHX Text
1018
AutoCAD SHX Text
COR
AutoCAD SHX Text
299.1
AutoCAD SHX Text
1019
AutoCAD SHX Text
COR
AutoCAD SHX Text
300.8
AutoCAD SHX Text
1020
AutoCAD SHX Text
GR
AutoCAD SHX Text
301.5
AutoCAD SHX Text
1021
AutoCAD SHX Text
SRW2.2
AutoCAD SHX Text
301.7
AutoCAD SHX Text
1022
AutoCAD SHX Text
COR2.2
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1023
AutoCAD SHX Text
26SYC
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1024
AutoCAD SHX Text
PCSRW2
AutoCAD SHX Text
301.8
AutoCAD SHX Text
1025
AutoCAD SHX Text
POC
AutoCAD SHX Text
302.0
AutoCAD SHX Text
1026
AutoCAD SHX Text
OR1.5
AutoCAD SHX Text
303.9
AutoCAD SHX Text
1027
AutoCAD SHX Text
END0
AutoCAD SHX Text
303.7
AutoCAD SHX Text
1028
AutoCAD SHX Text
SRW0
AutoCAD SHX Text
302.0
AutoCAD SHX Text
1029
AutoCAD SHX Text
COR1.5
AutoCAD SHX Text
301.8
AutoCAD SHX Text
1030
AutoCAD SHX Text
POC
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1031
AutoCAD SHX Text
COR1
AutoCAD SHX Text
301.2
AutoCAD SHX Text
1032
AutoCAD SHX Text
ENDATIP
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1033
AutoCAD SHX Text
GR
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1034
AutoCAD SHX Text
8CED
AutoCAD SHX Text
304.2
AutoCAD SHX Text
1035
AutoCAD SHX Text
14CED
AutoCAD SHX Text
305.0
AutoCAD SHX Text
1036
AutoCAD SHX Text
GR
AutoCAD SHX Text
305.4
AutoCAD SHX Text
1037
AutoCAD SHX Text
GR
AutoCAD SHX Text
308.5
AutoCAD SHX Text
1038
AutoCAD SHX Text
TS
AutoCAD SHX Text
310.5
AutoCAD SHX Text
1039
AutoCAD SHX Text
TS
AutoCAD SHX Text
311.5
AutoCAD SHX Text
1040
AutoCAD SHX Text
TS
AutoCAD SHX Text
311.2
AutoCAD SHX Text
1041
AutoCAD SHX Text
TS
AutoCAD SHX Text
310.9
AutoCAD SHX Text
1042
AutoCAD SHX Text
TS
AutoCAD SHX Text
310.4
AutoCAD SHX Text
1043
AutoCAD SHX Text
9CED
AutoCAD SHX Text
308.8
AutoCAD SHX Text
1044
AutoCAD SHX Text
11M
AutoCAD SHX Text
309.6
AutoCAD SHX Text
1045
AutoCAD SHX Text
CNCWL1.5W
AutoCAD SHX Text
310.1
AutoCAD SHX Text
1046
AutoCAD SHX Text
CORPC
AutoCAD SHX Text
310.0
AutoCAD SHX Text
1047
AutoCAD SHX Text
POC
AutoCAD SHX Text
310.3
AutoCAD SHX Text
1048
AutoCAD SHX Text
PTCOR
AutoCAD SHX Text
310.4
AutoCAD SHX Text
1049
AutoCAD SHX Text
CLBRK4
AutoCAD SHX Text
310.5
AutoCAD SHX Text
1050
AutoCAD SHX Text
POC1.2
AutoCAD SHX Text
310.4
AutoCAD SHX Text
1051
AutoCAD SHX Text
PTCOR1.2
AutoCAD SHX Text
310.0
AutoCAD SHX Text
1052
AutoCAD SHX Text
ENDWL
AutoCAD SHX Text
307.4
AutoCAD SHX Text
1053
AutoCAD SHX Text
CLF
AutoCAD SHX Text
309.7
AutoCAD SHX Text
1054
AutoCAD SHX Text
CLF
AutoCAD SHX Text
301.8
AutoCAD SHX Text
1055
AutoCAD SHX Text
COR
AutoCAD SHX Text
292.6
AutoCAD SHX Text
1056
AutoCAD SHX Text
ANGCLF
AutoCAD SHX Text
283.1
AutoCAD SHX Text
1057
AutoCAD SHX Text
ANGCLF
AutoCAD SHX Text
278.1
AutoCAD SHX Text
1058
AutoCAD SHX Text
12O
AutoCAD SHX Text
279.4
AutoCAD SHX Text
1059
AutoCAD SHX Text
13O
AutoCAD SHX Text
283.5
AutoCAD SHX Text
1060
AutoCAD SHX Text
10M
AutoCAD SHX Text
274.4
AutoCAD SHX Text
1061
AutoCAD SHX Text
15O
AutoCAD SHX Text
262.4
AutoCAD SHX Text
1062
AutoCAD SHX Text
15O
AutoCAD SHX Text
263.0
AutoCAD SHX Text
1063
AutoCAD SHX Text
12M
AutoCAD SHX Text
273.7
AutoCAD SHX Text
1064
AutoCAD SHX Text
18M
AutoCAD SHX Text
267.8
AutoCAD SHX Text
1065
AutoCAD SHX Text
30O
AutoCAD SHX Text
274.4
AutoCAD SHX Text
1066
AutoCAD SHX Text
21O
AutoCAD SHX Text
279.3
AutoCAD SHX Text
1067
AutoCAD SHX Text
12M
AutoCAD SHX Text
272.8
AutoCAD SHX Text
1068
AutoCAD SHX Text
12O
AutoCAD SHX Text
283.3
AutoCAD SHX Text
1069
AutoCAD SHX Text
10M
AutoCAD SHX Text
279.3
AutoCAD SHX Text
1070
AutoCAD SHX Text
16O
AutoCAD SHX Text
279.6
AutoCAD SHX Text
1071
AutoCAD SHX Text
16O
AutoCAD SHX Text
281.5
AutoCAD SHX Text
1072
AutoCAD SHX Text
8M
AutoCAD SHX Text
275.3
AutoCAD SHX Text
1073
AutoCAD SHX Text
GR
AutoCAD SHX Text
273.5
AutoCAD SHX Text
1074
AutoCAD SHX Text
BS
AutoCAD SHX Text
269.2
AutoCAD SHX Text
1075
AutoCAD SHX Text
14OBS
AutoCAD SHX Text
270.0
AutoCAD SHX Text
1076
AutoCAD SHX Text
10M
AutoCAD SHX Text
262.0
AutoCAD SHX Text
1077
AutoCAD SHX Text
GR
AutoCAD SHX Text
277.6
AutoCAD SHX Text
1078
AutoCAD SHX Text
16O
AutoCAD SHX Text
278.1
AutoCAD SHX Text
1079
AutoCAD SHX Text
24O
AutoCAD SHX Text
287.1
AutoCAD SHX Text
1080
AutoCAD SHX Text
1522O
AutoCAD SHX Text
279.2
AutoCAD SHX Text
1081
AutoCAD SHX Text
15O
AutoCAD SHX Text
278.5
AutoCAD SHX Text
1082
AutoCAD SHX Text
13O
AutoCAD SHX Text
302.1
AutoCAD SHX Text
1083
AutoCAD SHX Text
OUTFCECRW0
AutoCAD SHX Text
298.1
AutoCAD SHX Text
1084
AutoCAD SHX Text
POC3.8
AutoCAD SHX Text
294.9
AutoCAD SHX Text
1085
AutoCAD SHX Text
POC7.2
AutoCAD SHX Text
298.1
AutoCAD SHX Text
1086
AutoCAD SHX Text
PTCOR3.8
AutoCAD SHX Text
297.6
AutoCAD SHX Text
1087
AutoCAD SHX Text
12O
AutoCAD SHX Text
300.8
AutoCAD SHX Text
1088
AutoCAD SHX Text
CRW1
AutoCAD SHX Text
298.1
AutoCAD SHX Text
1089
AutoCAD SHX Text
TS
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1090
AutoCAD SHX Text
TS
AutoCAD SHX Text
298.7
AutoCAD SHX Text
1091
AutoCAD SHX Text
ENDCRW
AutoCAD SHX Text
296.5
AutoCAD SHX Text
1092
AutoCAD SHX Text
TS78M
AutoCAD SHX Text
294.7
AutoCAD SHX Text
1093
AutoCAD SHX Text
16O
AutoCAD SHX Text
287.4
AutoCAD SHX Text
1094
AutoCAD SHX Text
8O
AutoCAD SHX Text
285.3
AutoCAD SHX Text
1095
AutoCAD SHX Text
GR
AutoCAD SHX Text
299.1
AutoCAD SHX Text
1096
AutoCAD SHX Text
INCRW
AutoCAD SHX Text
298.6
AutoCAD SHX Text
1097
AutoCAD SHX Text
CORPC
AutoCAD SHX Text
298.6
AutoCAD SHX Text
1098
AutoCAD SHX Text
POC
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1099
AutoCAD SHX Text
POC
AutoCAD SHX Text
298.6
AutoCAD SHX Text
1100
AutoCAD SHX Text
PTCOR
AutoCAD SHX Text
298.6
AutoCAD SHX Text
1101
AutoCAD SHX Text
COR
AutoCAD SHX Text
299.2
AutoCAD SHX Text
1102
AutoCAD SHX Text
ENDWL
AutoCAD SHX Text
300.2
AutoCAD SHX Text
1103
AutoCAD SHX Text
PCCRW
AutoCAD SHX Text
300.9
AutoCAD SHX Text
1104
AutoCAD SHX Text
POCBRK4
AutoCAD SHX Text
300.4
AutoCAD SHX Text
1105
AutoCAD SHX Text
PTEND
AutoCAD SHX Text
301.5
AutoCAD SHX Text
1106
AutoCAD SHX Text
8CED
AutoCAD SHX Text
300.9
AutoCAD SHX Text
1107
AutoCAD SHX Text
14M
AutoCAD SHX Text
299.8
AutoCAD SHX Text
1108
AutoCAD SHX Text
8CED
AutoCAD SHX Text
298.9
AutoCAD SHX Text
1109
AutoCAD SHX Text
79M
AutoCAD SHX Text
295.9
AutoCAD SHX Text
1110
AutoCAD SHX Text
22MDEAD
AutoCAD SHX Text
295.7
AutoCAD SHX Text
1111
AutoCAD SHX Text
GR
AutoCAD SHX Text
291.8
AutoCAD SHX Text
1112
AutoCAD SHX Text
GR
AutoCAD SHX Text
287.4
AutoCAD SHX Text
1113
AutoCAD SHX Text
13O
AutoCAD SHX Text
289.4
AutoCAD SHX Text
1114
AutoCAD SHX Text
16O
AutoCAD SHX Text
293.7
AutoCAD SHX Text
1115
AutoCAD SHX Text
13O
AutoCAD SHX Text
300.4
AutoCAD SHX Text
1116
AutoCAD SHX Text
10M
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1117
AutoCAD SHX Text
13M
AutoCAD SHX Text
304.8
AutoCAD SHX Text
1118
AutoCAD SHX Text
GR
AutoCAD SHX Text
307.1
AutoCAD SHX Text
1119
AutoCAD SHX Text
10M
AutoCAD SHX Text
308.9
AutoCAD SHX Text
1120
AutoCAD SHX Text
GR
AutoCAD SHX Text
306.5
AutoCAD SHX Text
1121
AutoCAD SHX Text
GR
AutoCAD SHX Text
309.1
AutoCAD SHX Text
1122
AutoCAD SHX Text
10M
AutoCAD SHX Text
299.8
AutoCAD SHX Text
1123
AutoCAD SHX Text
9O
AutoCAD SHX Text
300.8
AutoCAD SHX Text
1124
AutoCAD SHX Text
15M
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1125
AutoCAD SHX Text
GR
AutoCAD SHX Text
296.2
AutoCAD SHX Text
1126
AutoCAD SHX Text
GR
AutoCAD SHX Text
298.1
AutoCAD SHX Text
1127
AutoCAD SHX Text
GR
AutoCAD SHX Text
297.6
AutoCAD SHX Text
1128
AutoCAD SHX Text
GR
AutoCAD SHX Text
299.0
AutoCAD SHX Text
1129
AutoCAD SHX Text
20FIR
AutoCAD SHX Text
299.4
AutoCAD SHX Text
1130
AutoCAD SHX Text
BS
AutoCAD SHX Text
299.5
AutoCAD SHX Text
1131
AutoCAD SHX Text
BS
AutoCAD SHX Text
299.8
AutoCAD SHX Text
1132
AutoCAD SHX Text
BSCOR2X2PST
AutoCAD SHX Text
299.9
AutoCAD SHX Text
1133
AutoCAD SHX Text
COR2X2PST
AutoCAD SHX Text
301.9
AutoCAD SHX Text
1134
AutoCAD SHX Text
CORCRW3
AutoCAD SHX Text
302.0
AutoCAD SHX Text
1135
AutoCAD SHX Text
CORCRW3
AutoCAD SHX Text
301.7
AutoCAD SHX Text
1136
AutoCAD SHX Text
CRW.6
AutoCAD SHX Text
301.3
AutoCAD SHX Text
1137
AutoCAD SHX Text
END1
AutoCAD SHX Text
301.4
AutoCAD SHX Text
1138
AutoCAD SHX Text
TS
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1139
AutoCAD SHX Text
TS7CED
AutoCAD SHX Text
299.4
AutoCAD SHX Text
1140
AutoCAD SHX Text
GR
AutoCAD SHX Text
299.5
AutoCAD SHX Text
1141
AutoCAD SHX Text
GR
AutoCAD SHX Text
299.4
AutoCAD SHX Text
1142
AutoCAD SHX Text
GR
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1143
AutoCAD SHX Text
CRW.6
AutoCAD SHX Text
298.6
AutoCAD SHX Text
1144
AutoCAD SHX Text
END.6
AutoCAD SHX Text
299.4
AutoCAD SHX Text
1145
AutoCAD SHX Text
GAS
AutoCAD SHX Text
299.6
AutoCAD SHX Text
1146
AutoCAD SHX Text
GAS
AutoCAD SHX Text
299.6
AutoCAD SHX Text
1147
AutoCAD SHX Text
CRW2.3
AutoCAD SHX Text
299.2
AutoCAD SHX Text
1148
AutoCAD SHX Text
COR2.7
AutoCAD SHX Text
299.6
AutoCAD SHX Text
1149
AutoCAD SHX Text
END2.4
AutoCAD SHX Text
304.9
AutoCAD SHX Text
1150
AutoCAD SHX Text
PAT
AutoCAD SHX Text
302.5
AutoCAD SHX Text
1151
AutoCAD SHX Text
CRW2.1
AutoCAD SHX Text
302.5
AutoCAD SHX Text
1152
AutoCAD SHX Text
COR
AutoCAD SHX Text
303.7
AutoCAD SHX Text
1153
AutoCAD SHX Text
CRW1
AutoCAD SHX Text
304.4
AutoCAD SHX Text
1154
AutoCAD SHX Text
END.5
AutoCAD SHX Text
305.3
AutoCAD SHX Text
1155
AutoCAD SHX Text
GR
AutoCAD SHX Text
305.1
AutoCAD SHX Text
1156
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
305.8
AutoCAD SHX Text
1157
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
307.1
AutoCAD SHX Text
1158
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
306.4
AutoCAD SHX Text
1159
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1160
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
301.9
AutoCAD SHX Text
1161
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1162
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
305.1
AutoCAD SHX Text
1163
AutoCAD SHX Text
CORLDG
AutoCAD SHX Text
304.4
AutoCAD SHX Text
1164
AutoCAD SHX Text
CORLDGSRW.6
AutoCAD SHX Text
304.0
AutoCAD SHX Text
1165
AutoCAD SHX Text
SRW.8
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1166
AutoCAD SHX Text
SRW.8
AutoCAD SHX Text
300.4
AutoCAD SHX Text
1167
AutoCAD SHX Text
ENDSRW
AutoCAD SHX Text
304.7
AutoCAD SHX Text
1168
AutoCAD SHX Text
ONLDG
AutoCAD SHX Text
306.3
AutoCAD SHX Text
1169
AutoCAD SHX Text
ONLDG
AutoCAD SHX Text
306.9
AutoCAD SHX Text
1170
AutoCAD SHX Text
ONLDG
AutoCAD SHX Text
306.6
AutoCAD SHX Text
1171
AutoCAD SHX Text
ONLDG
AutoCAD SHX Text
305.4
AutoCAD SHX Text
1172
AutoCAD SHX Text
JOG3
AutoCAD SHX Text
305.8
AutoCAD SHX Text
1173
AutoCAD SHX Text
JOG4
AutoCAD SHX Text
306.9
AutoCAD SHX Text
1174
AutoCAD SHX Text
GR
AutoCAD SHX Text
304.7
AutoCAD SHX Text
1175
AutoCAD SHX Text
OUTFCCRW2
AutoCAD SHX Text
306.8
AutoCAD SHX Text
1176
AutoCAD SHX Text
OUTFCCRW2
AutoCAD SHX Text
307.1
AutoCAD SHX Text
1177
AutoCAD SHX Text
ENDWL
AutoCAD SHX Text
307.3
AutoCAD SHX Text
1178
AutoCAD SHX Text
CRW.5
AutoCAD SHX Text
307.6
AutoCAD SHX Text
1179
AutoCAD SHX Text
CRW0
AutoCAD SHX Text
306.4
AutoCAD SHX Text
1180
AutoCAD SHX Text
INTSRW1
AutoCAD SHX Text
305.8
AutoCAD SHX Text
1181
AutoCAD SHX Text
ENDSRW.7
AutoCAD SHX Text
308.2
AutoCAD SHX Text
1182
AutoCAD SHX Text
CRW0
AutoCAD SHX Text
307.9
AutoCAD SHX Text
1183
AutoCAD SHX Text
COR.6
AutoCAD SHX Text
308.0
AutoCAD SHX Text
1184
AutoCAD SHX Text
COR.6
AutoCAD SHX Text
309.4
AutoCAD SHX Text
1185
AutoCAD SHX Text
END0
AutoCAD SHX Text
309.6
AutoCAD SHX Text
1186
AutoCAD SHX Text
28SPR
AutoCAD SHX Text
307.9
AutoCAD SHX Text
1187
AutoCAD SHX Text
END0
AutoCAD SHX Text
306.4
AutoCAD SHX Text
1188
AutoCAD SHX Text
CRW.5
AutoCAD SHX Text
306.7
AutoCAD SHX Text
1189
AutoCAD SHX Text
END.5
AutoCAD SHX Text
308.6
AutoCAD SHX Text
1190
AutoCAD SHX Text
CRW0
AutoCAD SHX Text
306.5
AutoCAD SHX Text
1191
AutoCAD SHX Text
PC1.7
AutoCAD SHX Text
306.2
AutoCAD SHX Text
1192
AutoCAD SHX Text
POC2
AutoCAD SHX Text
306.2
AutoCAD SHX Text
1193
AutoCAD SHX Text
PTINT2.00.7
AutoCAD SHX Text
307.8
AutoCAD SHX Text
1194
AutoCAD SHX Text
78TREE
AutoCAD SHX Text
308.8
AutoCAD SHX Text
1195
AutoCAD SHX Text
PCSRW1
AutoCAD SHX Text
308.6
AutoCAD SHX Text
1196
AutoCAD SHX Text
POC1.2
AutoCAD SHX Text
308.5
AutoCAD SHX Text
1197
AutoCAD SHX Text
PRCINT1.2
AutoCAD SHX Text
307.0
AutoCAD SHX Text
1198
AutoCAD SHX Text
INT
AutoCAD SHX Text
307.0
AutoCAD SHX Text
1199
AutoCAD SHX Text
POC1.5
AutoCAD SHX Text
307.6
AutoCAD SHX Text
1200
AutoCAD SHX Text
PTEND1
AutoCAD SHX Text
306.2
AutoCAD SHX Text
1201
AutoCAD SHX Text
PCEND1
AutoCAD SHX Text
305.9
AutoCAD SHX Text
1202
AutoCAD SHX Text
POC
AutoCAD SHX Text
305.9
AutoCAD SHX Text
1203
AutoCAD SHX Text
PTCOR
AutoCAD SHX Text
306.2
AutoCAD SHX Text
1204
AutoCAD SHX Text
INT.9
AutoCAD SHX Text
305.3
AutoCAD SHX Text
1205
AutoCAD SHX Text
POCCRW
AutoCAD SHX Text
305.5
AutoCAD SHX Text
1206
AutoCAD SHX Text
PTCRW
AutoCAD SHX Text
306.1
AutoCAD SHX Text
1207
AutoCAD SHX Text
311.6
AutoCAD SHX Text
1208
AutoCAD SHX Text
INTCRW0
AutoCAD SHX Text
310.4
AutoCAD SHX Text
1209
AutoCAD SHX Text
COR0.7
AutoCAD SHX Text
310.3
AutoCAD SHX Text
1210
AutoCAD SHX Text
PC1
AutoCAD SHX Text
310.2
AutoCAD SHX Text
1211
AutoCAD SHX Text
POC
AutoCAD SHX Text
310.2
AutoCAD SHX Text
1212
AutoCAD SHX Text
PTINT.7
AutoCAD SHX Text
308.7
AutoCAD SHX Text
1213
AutoCAD SHX Text
INT1.5
AutoCAD SHX Text
309.3
AutoCAD SHX Text
1214
AutoCAD SHX Text
END1
AutoCAD SHX Text
311.1
AutoCAD SHX Text
1215
AutoCAD SHX Text
BS
AutoCAD SHX Text
311.9
AutoCAD SHX Text
1216
AutoCAD SHX Text
SRW1
AutoCAD SHX Text
311.5
AutoCAD SHX Text
1217
AutoCAD SHX Text
COR1.2
AutoCAD SHX Text
311.4
AutoCAD SHX Text
1218
AutoCAD SHX Text
ENDWL
AutoCAD SHX Text
313.1
AutoCAD SHX Text
1219
AutoCAD SHX Text
GR
AutoCAD SHX Text
314.0
AutoCAD SHX Text
1220
AutoCAD SHX Text
GR
AutoCAD SHX Text
316.1
AutoCAD SHX Text
1221
AutoCAD SHX Text
BRDBTH
AutoCAD SHX Text
316.3
AutoCAD SHX Text
1222
AutoCAD SHX Text
13M
AutoCAD SHX Text
313.2
AutoCAD SHX Text
1223
AutoCAD SHX Text
9O
AutoCAD SHX Text
312.3
AutoCAD SHX Text
1224
AutoCAD SHX Text
11M
AutoCAD SHX Text
308.9
AutoCAD SHX Text
1225
AutoCAD SHX Text
GR
AutoCAD SHX Text
308.7
AutoCAD SHX Text
1226
AutoCAD SHX Text
1313O
AutoCAD SHX Text
307.4
AutoCAD SHX Text
1227
AutoCAD SHX Text
TS
AutoCAD SHX Text
305.4
AutoCAD SHX Text
1228
AutoCAD SHX Text
16M
AutoCAD SHX Text
305.6
AutoCAD SHX Text
1229
AutoCAD SHX Text
GR
AutoCAD SHX Text
305.2
AutoCAD SHX Text
1230
AutoCAD SHX Text
PAT
AutoCAD SHX Text
305.3
AutoCAD SHX Text
1231
AutoCAD SHX Text
CORPAT
AutoCAD SHX Text
305.3
AutoCAD SHX Text
1232
AutoCAD SHX Text
CORPAT
AutoCAD SHX Text
304.8
AutoCAD SHX Text
1233
AutoCAD SHX Text
CORPAT
AutoCAD SHX Text
304.8
AutoCAD SHX Text
1234
AutoCAD SHX Text
GR
AutoCAD SHX Text
310.4
AutoCAD SHX Text
1235
AutoCAD SHX Text
9O
AutoCAD SHX Text
310.2
AutoCAD SHX Text
1236
AutoCAD SHX Text
8O
AutoCAD SHX Text
309.0
AutoCAD SHX Text
1237
AutoCAD SHX Text
21M
AutoCAD SHX Text
308.8
AutoCAD SHX Text
1238
AutoCAD SHX Text
912O
AutoCAD SHX Text
306.4
AutoCAD SHX Text
1239
AutoCAD SHX Text
10O
AutoCAD SHX Text
305.5
AutoCAD SHX Text
1240
AutoCAD SHX Text
10O
AutoCAD SHX Text
305.8
AutoCAD SHX Text
1241
AutoCAD SHX Text
14O
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1242
AutoCAD SHX Text
SRW1
AutoCAD SHX Text
302.2
AutoCAD SHX Text
1243
AutoCAD SHX Text
POC2
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1244
AutoCAD SHX Text
POC1.9
AutoCAD SHX Text
301.1
AutoCAD SHX Text
1245
AutoCAD SHX Text
28O
AutoCAD SHX Text
302.1
AutoCAD SHX Text
1246
AutoCAD SHX Text
PTINTSRW1.2
AutoCAD SHX Text
301.2
AutoCAD SHX Text
1247
AutoCAD SHX Text
POC1.2
AutoCAD SHX Text
299.3
AutoCAD SHX Text
1248
AutoCAD SHX Text
PC.6
AutoCAD SHX Text
298.4
AutoCAD SHX Text
1249
AutoCAD SHX Text
PC.6
AutoCAD SHX Text
297.2
AutoCAD SHX Text
1250
AutoCAD SHX Text
POC
AutoCAD SHX Text
296.0
AutoCAD SHX Text
1251
AutoCAD SHX Text
PTCOR1.7
AutoCAD SHX Text
294.9
AutoCAD SHX Text
1252
AutoCAD SHX Text
COR2.2
AutoCAD SHX Text
296.7
AutoCAD SHX Text
1253
AutoCAD SHX Text
COR.8
AutoCAD SHX Text
297.7
AutoCAD SHX Text
1254
AutoCAD SHX Text
ENDWL
AutoCAD SHX Text
297.5
AutoCAD SHX Text
1255
AutoCAD SHX Text
8888HEM
AutoCAD SHX Text
297.5
AutoCAD SHX Text
1256
AutoCAD SHX Text
9HEM
AutoCAD SHX Text
298.2
AutoCAD SHX Text
1257
AutoCAD SHX Text
99HEM
AutoCAD SHX Text
299.3
AutoCAD SHX Text
1258
AutoCAD SHX Text
78HEM
AutoCAD SHX Text
299.5
AutoCAD SHX Text
1259
AutoCAD SHX Text
89HEM
AutoCAD SHX Text
299.9
AutoCAD SHX Text
1260
AutoCAD SHX Text
9HEM
AutoCAD SHX Text
300.6
AutoCAD SHX Text
1261
AutoCAD SHX Text
66HEM
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1262
AutoCAD SHX Text
699HEM
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1263
AutoCAD SHX Text
7HEM
AutoCAD SHX Text
302.6
AutoCAD SHX Text
1264
AutoCAD SHX Text
7HEM
AutoCAD SHX Text
302.6
AutoCAD SHX Text
1265
AutoCAD SHX Text
GR
AutoCAD SHX Text
301.4
AutoCAD SHX Text
1266
AutoCAD SHX Text
36O
AutoCAD SHX Text
300.1
AutoCAD SHX Text
1267
AutoCAD SHX Text
SRW0
AutoCAD SHX Text
298.7
AutoCAD SHX Text
1268
AutoCAD SHX Text
COR1.5
AutoCAD SHX Text
299.9
AutoCAD SHX Text
1269
AutoCAD SHX Text
POC1
AutoCAD SHX Text
300.8
AutoCAD SHX Text
1270
AutoCAD SHX Text
PTCOR.6
AutoCAD SHX Text
301.8
AutoCAD SHX Text
1271
AutoCAD SHX Text
END0
AutoCAD SHX Text
301.1
AutoCAD SHX Text
1272
AutoCAD SHX Text
LP
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1273
AutoCAD SHX Text
BS
AutoCAD SHX Text
303.9
AutoCAD SHX Text
1274
AutoCAD SHX Text
TS
AutoCAD SHX Text
304.2
AutoCAD SHX Text
1275
AutoCAD SHX Text
TS
AutoCAD SHX Text
305.2
AutoCAD SHX Text
1277
AutoCAD SHX Text
GR
AutoCAD SHX Text
295.2
AutoCAD SHX Text
1278
AutoCAD SHX Text
BBCORDRV
AutoCAD SHX Text
296.34
AutoCAD SHX Text
1279
AutoCAD SHX Text
SMH
AutoCAD SHX Text
294.5
AutoCAD SHX Text
1280
AutoCAD SHX Text
BBCORDRV
AutoCAD SHX Text
294.7
AutoCAD SHX Text
1281
AutoCAD SHX Text
EP
AutoCAD SHX Text
297.1
AutoCAD SHX Text
1282
AutoCAD SHX Text
PCEP
AutoCAD SHX Text
299.1
AutoCAD SHX Text
1283
AutoCAD SHX Text
POC
AutoCAD SHX Text
301.1
AutoCAD SHX Text
1284
AutoCAD SHX Text
POC
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1285
AutoCAD SHX Text
PTCOR
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1286
AutoCAD SHX Text
EP
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1287
AutoCAD SHX Text
COR
AutoCAD SHX Text
302.4
AutoCAD SHX Text
1288
AutoCAD SHX Text
COR
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1289
AutoCAD SHX Text
COR
AutoCAD SHX Text
301.6
AutoCAD SHX Text
1290
AutoCAD SHX Text
COR
AutoCAD SHX Text
300.5
AutoCAD SHX Text
1291
AutoCAD SHX Text
EP
AutoCAD SHX Text
300.1
AutoCAD SHX Text
1292
AutoCAD SHX Text
PCEP
AutoCAD SHX Text
299.9
AutoCAD SHX Text
1293
AutoCAD SHX Text
CRW1.2
AutoCAD SHX Text
300.4
AutoCAD SHX Text
1294
AutoCAD SHX Text
CRW.7
AutoCAD SHX Text
300.2
AutoCAD SHX Text
1295
AutoCAD SHX Text
CORSRW4.7
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1296
AutoCAD SHX Text
COR2.5
AutoCAD SHX Text
304.7
AutoCAD SHX Text
1297
AutoCAD SHX Text
TOP4STPS0
AutoCAD SHX Text
304.7
AutoCAD SHX Text
1298
AutoCAD SHX Text
TOP4STPS0
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1299
AutoCAD SHX Text
CORSRW2.5
AutoCAD SHX Text
303.3
AutoCAD SHX Text
1300
AutoCAD SHX Text
END1.5
AutoCAD SHX Text
299.6
AutoCAD SHX Text
1301
AutoCAD SHX Text
EPCL6STPS4
AutoCAD SHX Text
300.5
AutoCAD SHX Text
1302
AutoCAD SHX Text
EP
AutoCAD SHX Text
301.3
AutoCAD SHX Text
1303
AutoCAD SHX Text
EPCLWK4
AutoCAD SHX Text
300.3
AutoCAD SHX Text
1304
AutoCAD SHX Text
CLTP6STPS
AutoCAD SHX Text
296.9
AutoCAD SHX Text
1305
AutoCAD SHX Text
CLSTPS
AutoCAD SHX Text
296.5
AutoCAD SHX Text
1306
AutoCAD SHX Text
CL5STPS
AutoCAD SHX Text
293.9
AutoCAD SHX Text
1307
AutoCAD SHX Text
CL5STPS
AutoCAD SHX Text
293.4
AutoCAD SHX Text
1308
AutoCAD SHX Text
ENDCW
AutoCAD SHX Text
293.9
AutoCAD SHX Text
1309
AutoCAD SHX Text
UP
AutoCAD SHX Text
293.9
AutoCAD SHX Text
1310
AutoCAD SHX Text
BBPCDRV
AutoCAD SHX Text
295.7
AutoCAD SHX Text
1311
AutoCAD SHX Text
POC
AutoCAD SHX Text
298.1
AutoCAD SHX Text
1312
AutoCAD SHX Text
POC
AutoCAD SHX Text
300.7
AutoCAD SHX Text
1313
AutoCAD SHX Text
POC
AutoCAD SHX Text
301.5
AutoCAD SHX Text
1314
AutoCAD SHX Text
PTDRV
AutoCAD SHX Text
299.2
AutoCAD SHX Text
1315
AutoCAD SHX Text
SRW.6
AutoCAD SHX Text
298.3
AutoCAD SHX Text
1316
AutoCAD SHX Text
COR1.5
AutoCAD SHX Text
297.3
AutoCAD SHX Text
1317
AutoCAD SHX Text
COR2.3
AutoCAD SHX Text
297.1
AutoCAD SHX Text
1318
AutoCAD SHX Text
COR2.5
AutoCAD SHX Text
299.3
AutoCAD SHX Text
1319
AutoCAD SHX Text
END0
AutoCAD SHX Text
297.1
AutoCAD SHX Text
1320
AutoCAD SHX Text
CL5STPS3
AutoCAD SHX Text
299.8
AutoCAD SHX Text
1321
AutoCAD SHX Text
CL5STPS3
AutoCAD SHX Text
297.0
AutoCAD SHX Text
1322
AutoCAD SHX Text
77777TREE
AutoCAD SHX Text
296.1
AutoCAD SHX Text
1323
AutoCAD SHX Text
SRW.6
AutoCAD SHX Text
295.4
AutoCAD SHX Text
1324
AutoCAD SHX Text
COR1.3
AutoCAD SHX Text
294.3
AutoCAD SHX Text
1325
AutoCAD SHX Text
COR2.3
AutoCAD SHX Text
293.4
AutoCAD SHX Text
1326
AutoCAD SHX Text
COR3.5
AutoCAD SHX Text
293.6
AutoCAD SHX Text
1327
AutoCAD SHX Text
CL6STPS4
AutoCAD SHX Text
296.8
AutoCAD SHX Text
1328
AutoCAD SHX Text
CL6STPS4
AutoCAD SHX Text
293.7
AutoCAD SHX Text
1329
AutoCAD SHX Text
SRW3
AutoCAD SHX Text
293.8
AutoCAD SHX Text
1330
AutoCAD SHX Text
SRW6
AutoCAD SHX Text
293.9
AutoCAD SHX Text
1331
AutoCAD SHX Text
CLDOOR38X10
AutoCAD SHX Text
296.9
AutoCAD SHX Text
1332
AutoCAD SHX Text
SRW3
AutoCAD SHX Text
300.3
AutoCAD SHX Text
1333
AutoCAD SHX Text
END0
AutoCAD SHX Text
300.2
AutoCAD SHX Text
1334
AutoCAD SHX Text
SRW0
AutoCAD SHX Text
296.8
AutoCAD SHX Text
1335
AutoCAD SHX Text
COR3
AutoCAD SHX Text
297.0
AutoCAD SHX Text
1336
AutoCAD SHX Text
COR2.5
AutoCAD SHX Text
297.6
AutoCAD SHX Text
1337
AutoCAD SHX Text
COR2.2
AutoCAD SHX Text
296.9
AutoCAD SHX Text
1338
AutoCAD SHX Text
SRW2.6
AutoCAD SHX Text
296.9
AutoCAD SHX Text
1339
AutoCAD SHX Text
CL6STPS4
AutoCAD SHX Text
297.3
AutoCAD SHX Text
1340
AutoCAD SHX Text
36TREE
AutoCAD SHX Text
294.3
AutoCAD SHX Text
1341
AutoCAD SHX Text
TPIT
AutoCAD SHX Text
293.6
AutoCAD SHX Text
1342
AutoCAD SHX Text
12HEM
AutoCAD SHX Text
293.2
AutoCAD SHX Text
1343
AutoCAD SHX Text
88HEM
AutoCAD SHX Text
293.3
AutoCAD SHX Text
1344
AutoCAD SHX Text
9HEM
AutoCAD SHX Text
293.4
AutoCAD SHX Text
1345
AutoCAD SHX Text
7HEM
AutoCAD SHX Text
293.3
AutoCAD SHX Text
1346
AutoCAD SHX Text
68HEM
AutoCAD SHX Text
293.3
AutoCAD SHX Text
1347
AutoCAD SHX Text
16HEM
AutoCAD SHX Text
293.6
AutoCAD SHX Text
1348
AutoCAD SHX Text
78HEM
AutoCAD SHX Text
293.7
AutoCAD SHX Text
1349
AutoCAD SHX Text
910HEM
AutoCAD SHX Text
293.8
AutoCAD SHX Text
1350
AutoCAD SHX Text
BS
AutoCAD SHX Text
295.9
AutoCAD SHX Text
1351
AutoCAD SHX Text
TS
AutoCAD SHX Text
293.1
AutoCAD SHX Text
1352
AutoCAD SHX Text
BB
AutoCAD SHX Text
292.6
AutoCAD SHX Text
1353
AutoCAD SHX Text
PCBB
AutoCAD SHX Text
292.2
AutoCAD SHX Text
1354
AutoCAD SHX Text
POC
AutoCAD SHX Text
291.7
AutoCAD SHX Text
1355
AutoCAD SHX Text
ENDCORDRV
AutoCAD SHX Text
292.0
AutoCAD SHX Text
1356
AutoCAD SHX Text
UP
AutoCAD SHX Text
291.74
AutoCAD SHX Text
1357
AutoCAD SHX Text
SMHBENCH
AutoCAD SHX Text
297.2
AutoCAD SHX Text
1358
AutoCAD SHX Text
SRW0
AutoCAD SHX Text
294.9
AutoCAD SHX Text
1359
AutoCAD SHX Text
POC1.9
AutoCAD SHX Text
295.4
AutoCAD SHX Text
1360
AutoCAD SHX Text
POC2.1
AutoCAD SHX Text
298.6
AutoCAD SHX Text
1361
AutoCAD SHX Text
PTENDGAS
AutoCAD SHX Text
299.5
AutoCAD SHX Text
1362
AutoCAD SHX Text
GAS
AutoCAD SHX Text
299.5
AutoCAD SHX Text
1363
AutoCAD SHX Text
GAS
AutoCAD SHX Text
295.7
AutoCAD SHX Text
1364
AutoCAD SHX Text
GAS
AutoCAD SHX Text
291.4
AutoCAD SHX Text
1365
AutoCAD SHX Text
GAS
AutoCAD SHX Text
293.2
AutoCAD SHX Text
1366
AutoCAD SHX Text
STNWL2W
AutoCAD SHX Text
292.1
AutoCAD SHX Text
1367
AutoCAD SHX Text
STNWL2W
AutoCAD SHX Text
292.0
AutoCAD SHX Text
1368
AutoCAD SHX Text
CORPC
AutoCAD SHX Text
292.7
AutoCAD SHX Text
1369
AutoCAD SHX Text
POC
AutoCAD SHX Text
292.9
AutoCAD SHX Text
1370
AutoCAD SHX Text
PTWL
AutoCAD SHX Text
293.4
AutoCAD SHX Text
1371
AutoCAD SHX Text
ENDWL
AutoCAD SHX Text
293.8
AutoCAD SHX Text
1372
AutoCAD SHX Text
BKSRW1.3W
AutoCAD SHX Text
294.5
AutoCAD SHX Text
1373
AutoCAD SHX Text
BKSRW1.3W
AutoCAD SHX Text
297.8
AutoCAD SHX Text
1374
AutoCAD SHX Text
BKSRW1.3W
AutoCAD SHX Text
297.9
AutoCAD SHX Text
1375
AutoCAD SHX Text
BKSRW1.3W
AutoCAD SHX Text
299.3
AutoCAD SHX Text
1376
AutoCAD SHX Text
POCEP
AutoCAD SHX Text
298.1
AutoCAD SHX Text
1377
AutoCAD SHX Text
PCC
AutoCAD SHX Text
294.7
AutoCAD SHX Text
1378
AutoCAD SHX Text
POC
AutoCAD SHX Text
294.8
AutoCAD SHX Text
1379
AutoCAD SHX Text
56HEM
AutoCAD SHX Text
294.3
AutoCAD SHX Text
1380
AutoCAD SHX Text
9HEM
AutoCAD SHX Text
293.4
AutoCAD SHX Text
1381
AutoCAD SHX Text
7HEM
AutoCAD SHX Text
300.1
AutoCAD SHX Text
1382
AutoCAD SHX Text
PCEP
AutoCAD SHX Text
299.7
AutoCAD SHX Text
1383
AutoCAD SHX Text
POC
AutoCAD SHX Text
298.3
AutoCAD SHX Text
1384
AutoCAD SHX Text
PCC
AutoCAD SHX Text
294.9
AutoCAD SHX Text
1385
AutoCAD SHX Text
POC
AutoCAD SHX Text
292.4
AutoCAD SHX Text
1386
AutoCAD SHX Text
PTCOR
AutoCAD SHX Text
294.7
AutoCAD SHX Text
1387
AutoCAD SHX Text
EP
AutoCAD SHX Text
291.3
AutoCAD SHX Text
1388
AutoCAD SHX Text
PCDRV
AutoCAD SHX Text
291.8
AutoCAD SHX Text
1389
AutoCAD SHX Text
POC
AutoCAD SHX Text
292.9
AutoCAD SHX Text
1390
AutoCAD SHX Text
POC
AutoCAD SHX Text
293.9
AutoCAD SHX Text
1391
AutoCAD SHX Text
BS
AutoCAD SHX Text
296.1
AutoCAD SHX Text
1392
AutoCAD SHX Text
TS
AutoCAD SHX Text
0.00
AutoCAD SHX Text
23
AutoCAD SHX Text
STK
AutoCAD SHX Text
0.00
AutoCAD SHX Text
30
AutoCAD SHX Text
STK
AutoCAD SHX Text
302.3
AutoCAD SHX Text
1276
AutoCAD SHX Text
TRAV
AutoCAD SHX Text
0.00
AutoCAD SHX Text
22
AutoCAD SHX Text
NAIL
AutoCAD SHX Text
290.7
AutoCAD SHX Text
1393
AutoCAD SHX Text
SMH
AutoCAD SHX Text
QUINT. 7"TREE
AutoCAD SHX Text
QUINT. 7"TREE
AutoCAD SHX Text
7"+8"HEM
AutoCAD SHX Text
16"HEM
AutoCAD SHX Text
7"HEM
AutoCAD SHX Text
6"+8"HEM
AutoCAD SHX Text
9"HEM
AutoCAD SHX Text
8"+8"HEM
AutoCAD SHX Text
12"HEM
AutoCAD SHX Text
30"OAK
AutoCAD SHX Text
21"OAK
AutoCAD SHX Text
12"OAK
AutoCAD SHX Text
18"OAK
AutoCAD SHX Text
12"MAPLE
AutoCAD SHX Text
15"OAK
AutoCAD SHX Text
10''MAPLE
AutoCAD SHX Text
12''OAK
AutoCAD SHX Text
16''OAK
AutoCAD SHX Text
13''OAK
AutoCAD SHX Text
16''OAK
AutoCAD SHX Text
8''MAPLE
AutoCAD SHX Text
8''OAK
AutoCAD SHX Text
14''OAK
AutoCAD SHX Text
10''MAPLE
AutoCAD SHX Text
15''OAK
AutoCAD SHX Text
13''OAK
AutoCAD SHX Text
24''OAK
AutoCAD SHX Text
16''OAK
AutoCAD SHX Text
15''+22''OAK
AutoCAD SHX Text
16"MAPLE
AutoCAD SHX Text
13"+13"OAK
AutoCAD SHX Text
11"MAPLE
AutoCAD SHX Text
9''OAK
AutoCAD SHX Text
13''MAPLE
AutoCAD SHX Text
9''OAK
AutoCAD SHX Text
9''+12''OAK
AutoCAD SHX Text
21''MAPLE
AutoCAD SHX Text
8''OAK
AutoCAD SHX Text
10''OAK
AutoCAD SHX Text
10''OAK
AutoCAD SHX Text
14''OAK
AutoCAD SHX Text
6"+6"+9"HEM
AutoCAD SHX Text
7''HEM
AutoCAD SHX Text
7''HEM
AutoCAD SHX Text
9"HEM
AutoCAD SHX Text
8''+9''HEM
AutoCAD SHX Text
7''+8''HEM
AutoCAD SHX Text
9''+9''HEM
AutoCAD SHX Text
QUAD.8''HEM
AutoCAD SHX Text
9''HEM
AutoCAD SHX Text
S
AutoCAD SHX Text
SMH
AutoCAD SHX Text
RIM=291.74(BENCH)
AutoCAD SHX Text
SMH
AutoCAD SHX Text
S
AutoCAD SHX Text
S
AutoCAD SHX Text
SMH
AutoCAD SHX Text
RIM=296.34
AutoCAD SHX Text
BIT. BERM
AutoCAD SHX Text
BIT. BERM
AutoCAD SHX Text
UP
AutoCAD SHX Text
UP
AutoCAD SHX Text
5''+6"HEM
AutoCAD SHX Text
9"HEM
AutoCAD SHX Text
9"HEM
AutoCAD SHX Text
x
AutoCAD SHX Text
x
AutoCAD SHX Text
x
AutoCAD SHX Text
15''OAK
AutoCAD SHX Text
13''OAK
AutoCAD SHX Text
10''MAPLE
AutoCAD SHX Text
12''OAK
AutoCAD SHX Text
9"OAK
AutoCAD SHX Text
CHAIN LINK FENCE
AutoCAD SHX Text
12''OAK
AutoCAD SHX Text
20''FIR
AutoCAD SHX Text
16''OAK
AutoCAD SHX Text
16''OAK
AutoCAD SHX Text
22''MAPLE(DEAD)
AutoCAD SHX Text
7''+8''MAPLE
AutoCAD SHX Text
13''OAK
AutoCAD SHX Text
10''MAPLE
AutoCAD SHX Text
13"MAPLE
AutoCAD SHX Text
7"+9"MAPLE
AutoCAD SHX Text
8"CEDAR
AutoCAD SHX Text
10"MAPLE
AutoCAD SHX Text
15"MAPLE
AutoCAD SHX Text
8"CEDAR
AutoCAD SHX Text
14"CEDAR
AutoCAD SHX Text
26"SYCAMORE
AutoCAD SHX Text
TP
AutoCAD SHX Text
8"HEM
AutoCAD SHX Text
8"HEM
AutoCAD SHX Text
6"+6"+8"HEM
AutoCAD SHX Text
8"SPRUCE
AutoCAD SHX Text
10"HEM
AutoCAD SHX Text
13"HEM
AutoCAD SHX Text
8"HEM
AutoCAD SHX Text
8"HEM
AutoCAD SHX Text
12"HEM
AutoCAD SHX Text
10"HEM
AutoCAD SHX Text
7"+8"HEM
AutoCAD SHX Text
8"PINE
AutoCAD SHX Text
10"PINE
AutoCAD SHX Text
8"PINE
AutoCAD SHX Text
TP
AutoCAD SHX Text
7"CEDAR
AutoCAD SHX Text
LIGHT
AutoCAD SHX Text
POST
AutoCAD SHX Text
36"TREE
AutoCAD SHX Text
TP
AutoCAD SHX Text
CONC. WALK
AutoCAD SHX Text
28"SPRUCE
AutoCAD SHX Text
7"+8"TREE
AutoCAD SHX Text
32"OAK
AutoCAD SHX Text
6"+6"HEM
AutoCAD SHX Text
PATIO
AutoCAD SHX Text
PATIO
AutoCAD SHX Text
PATIO
AutoCAD SHX Text
CE
AutoCAD SHX Text
GAS
AutoCAD SHX Text
9"CEDAR
AutoCAD SHX Text
10"MAPLE
AutoCAD SHX Text
LEDGE
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303.6
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1650
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303.5
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1651
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302.5
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1652
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303.7
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1653
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299.0
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299.2
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1655
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301.9
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301.1
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299.2
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298.9
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295.8
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SCALE: 1"= 40'
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LOCATED IN
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PREPARED FOR
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DATE: OCTOBER 18, 2021
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(MIDDLESEX COUNTY)
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LEXINGTON, MASSACHUSETTS
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DRAINAGE PLAN
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HYDROLOGIC SOIL GROUP
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12 SUMMIT ROAD
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12 SUMMIT ROAD, LLC.
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Page 120: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Soil Map—Middlesex County, Massachusetts(12 Summit Rd NRCS Web Soil Survey)

Natural ResourcesConservation Service

Web Soil SurveyNational Cooperative Soil Survey

10/18/2021Page 1 of 3

4699

730

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770

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318110 318130 318150 318170 318190 318210 318230 318250 318270 318290 318310 318330 318350

318090 318110 318130 318150 318170 318190 318210 318230 318250 318270 318290 318310 318330 318350

42° 25' 48'' N71

° 1

2' 4

1'' W

42° 25' 48'' N

71° 1

2' 2

9'' W

42° 25' 42'' N

71° 1

2' 4

1'' W

42° 25' 42'' N

71° 1

2' 2

9'' W

N

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 19N WGS840 50 100 200 300

Feet0 15 30 60 90

MetersMap Scale: 1:1,240 if printed on A landscape (11" x 8.5") sheet.

Soil Map may not be valid at this scale.

Page 121: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

MAP LEGEND MAP INFORMATION

Area of Interest (AOI)Area of Interest (AOI)

SoilsSoil Map Unit Polygons

Soil Map Unit Lines

Soil Map Unit Points

Special Point FeaturesBlowout

Borrow Pit

Clay Spot

Closed Depression

Gravel Pit

Gravelly Spot

Landfill

Lava Flow

Marsh or swamp

Mine or Quarry

Miscellaneous Water

Perennial Water

Rock Outcrop

Saline Spot

Sandy Spot

Severely Eroded Spot

Sinkhole

Slide or Slip

Sodic Spot

Spoil Area

Stony Spot

Very Stony Spot

Wet Spot

Other

Special Line Features

Water FeaturesStreams and Canals

TransportationRails

Interstate Highways

US Routes

Major Roads

Local Roads

BackgroundAerial Photography

The soil surveys that comprise your AOI were mapped at 1:25,000.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale.

Please rely on the bar scale on each map sheet for map measurements.

Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857)

Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: Middlesex County, MassachusettsSurvey Area Data: Version 21, Sep 2, 2021

Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Aug 13, 2020—Sep 15, 2020

The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Soil Map—Middlesex County, Massachusetts(12 Summit Rd NRCS Web Soil Survey)

Natural ResourcesConservation Service

Web Soil SurveyNational Cooperative Soil Survey

10/18/2021Page 2 of 3

Page 122: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Map Unit Legend

Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI

631C Charlton-Urban land-Hollis complex, 3 to 15 percent slopes, rocky

6.6 100.0%

Totals for Area of Interest 6.6 100.0%

Soil Map—Middlesex County, Massachusetts 12 Summit Rd NRCS Web Soil Survey

Natural ResourcesConservation Service

Web Soil SurveyNational Cooperative Soil Survey

10/18/2021Page 3 of 3

Page 123: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

CAPTURE AREA ADJUSTMENT

Due to a limitation of grading adjustments that can be made for this project the amount of runoff that can be directed to the infiltration facility. Therefor the storage capacity of the infiltration facilities has been increased to allow for so it may capture more of the runoff from the impervious surface within the drainage area. The following calculation in accordance with MA Stormwater Handbook demonstrates at the storage capacity of the infiltration BMP’s is sufficient to meet Standard #3. Steps:

1. Required recharge volume for total site impervious area.

From Standard #3 recharge calculations page, summation of required recharge volume = 1,127 CF

2. Site impervious area draining to recharge facilities (from previous). Roof runoff captured completely within infiltration systems on each lot.

Area = 15,722 SF

3. Divide total site impervious area by impervious area draining to recharge

facilities. Roof runoff captured completely within infiltration systems.

Total Site Impervious =11,849 SF 22,549 SF / 15,722 = 1.43

4. Multiply result of #3 by original recharge volume in #1.

1.43 x 1,127 = 1,616 CF

5. Ensure minimum 65% impervious area draining to recharge facilities.

15,722 SF / 22,549 SF = 0.70 = 70%

6. Recharge facilities provide total recharge volume of 6,668 CF. Recharge volume 6,668 CF > 1,127 CF adjusted total recharge volume.

All Recharge Volumes have been achieved as required by the Massachusetts Stormwater Management Standards

Page 124: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Non-automated: Mar.4, 2008

INSTRUCTIONS:1. Sheet is nonautomated. Print sheet and complete using hand calculations. Column A and B: See MassDEP Structural BMP Table2. The calcualtions must be completed using the Column Headings specified in Chart and Not the Excel Column Headings3. To complete Chart Column D, multiple Column B value within Row x Column C value within Row4. To complete Chart Column E value, subtract Column D value within Row from Column C within Row5. Total TSS Removal = Sum All Values in Column D

Location:

Train 1+2:

A B C D EBMP TSS Removal Starting TSS Amount Remaining

Rate Load* Removed (B*C) Load (C-D)

Project: Prepared By:

Date:

12 Summit Road, Lexington, MA

Isolator Row, PSIS

TS

S R

emo

val

C

alcu

lati

on

Area/Trench Drains

Proposed Subsurface Infiltration System

(PSIS)

1.00

1.00

0.80Isoloator Row

0%

80%

0.00 1.00

0.20

80% 0.20 0.16 0.04

which enters the BMP

** See portion of STEP Fact Sheet for removal rate

21045Patriot Engineering10/18/2021

*Equals remaining load from previous BMP(E)

96.0% Total TSS Removal =

Non-automated TSS Calculation Sheetmust be used if Proprietary BMP Proposed1. From MassDEP Stormwater Handbook Vol. 1

Mass. Dept. of Environmental ProtectionC:\Users\Mike\Desktop\Summit\PBD DEFINITIVE\21045-Tss

Page 125: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

72-HOUR DRAW DOWN CALCULATIONS Time =

Rv = Storage Volume K = Saturated Hydraulic Conductivity for Sandy Loam = 1.02 in/hour Bottom Area = Bottom Area of Recharge Structure n = Porosity (1)

PSIS-1

Rv = 3,951 cf Bottom Area = 1,858 sf

Time = 3,951 cf / (1.02 in/hr)(1’/12”)(1,858 sf)(1)

Time = 25.0 hours

25.0 hours < 72 hours PSIS-2 Rv = 1,463 cf Bottom Area = 730 sf Time = 1,463 cf / (2.41in/hr)(1’/12”)(730 sf)(1) Time = 10.0 hours 10.0 hours < 72 hours PSIS-3 Rv = 733 cf Bottom Area = 366 sf Time = 733 cf / (1.02 in/hr)(1’/12”)(730 sf)(1) Time = 11.8 hours 11.8 hours < 72 hours PSIS-4 Rv = 1,301 cf Bottom Area = 654 sf Time =1,301 cf / (2.41 in/hr)(1’/12”)(654 sf)(1) Time = 9.9 hours 9.9 hours < 72 hours

Page 126: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

OPERATION AND MAINTENANCE & EROSION AND SEDIMENTATION CONTROL PROGRAM

for A PROPOSED STORMWATER MANAGEMENT SYSTEM

located at 12 SUMMIT ROAD

PUBLIC BENEFIT RESIDENTIAL SUBDIVISION

LEXINGTON, MASSACHUSETTS

Applicant:

12 Summit Road, LLC c/o DND Homes, LLC

271 Lincoln Street, #10 Lexington, Massachusetts 02421

Prepared by:

Patriot Engineering

35 Bedford Street, Suite 4 Lexington, Massachusetts 02420

(978) 726-2654

October 18, 2021

Page 127: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Project Name: 12 Summit Road Subdivision

Owner Name: 12 Summit Road, LLC

Party Responsible for Maintenance During Construction: Contractor Party Responsible for Maintenance After Construction: Homeowner’s Association Erosion and Sedimentation Control Measures during Construction Activities Filtermitt (or approved equal)

Filtermitt (or approved equal) will be installed along the down gradient limit of work as depicted on the Site Plan. The filtermitt shall be installed prior to the commencement of any work on-site and in accordance with the design plans. An additional supply of filtermitt shall be on-site to replace and/or repair any filtermitt that have been disturbed or are in poor condition. The line of filtermitt shall be inspected and maintained on a weekly basis and after every major storm event (2-year) during construction. No construction activities are to occur beyond the filtermitt at any time. Deposited sediments shall be removed when the volume of the deposition reaches approximately one-half the height of the filtermitt. Stockpiles

All unused debris, soil, and other material shall be stockpiled in locations of relatively flat grades, away from any trees identified to be saved and upgradient of the filtermitt. Stockpile side slopes shall not be greater than 2:1. All stockpiles shall be surrounded by a row of filtermitt. Surrounding filtermitt shall be inspected and maintained on a daily basis.

Surface Stabilization

The surface of all disturbed areas shall be stabilized during and after construction. Disturbed areas remaining idle for more than 14 days shall be stabilized. Temporary measures shall be taken during construction to prevent erosion and siltation. No construction sediment shall be allowed to enter any infiltration system or formal drainage system. All disturbed slopes will be stabilized with a permanent vegetative cover. Some or all of the following measures will be utilized on this project as conditions may warrant.

a. Temporary Seeding b. Temporary Mulching c. Permanent Seeding d. Placement of Sod e. Hydroseeding f. Placement of Hay g. Placement of Jute Netting

Dust shall be controlled at the site.

Page 128: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Tree Protection Existing trees to be saved shall be protected with orange construction fence (offset from the tree trunk by professional standard based on canopy). Construction Tracking Pad A construction tracking pad shall be installed at the designated entrances/exits, as shown on the Site plans, to the site to reduce the amount of sediment transported off site. The construction tracking pad shall be inspected weekly. Inspection and Maintenance of Trench/Area Drain The performance of the trench/area drain shall be checked after every major storm event during construction. Subsurface Infiltration Facilities Construction activity above and around the proposed location of the subsurface infiltration facility shall be limited to prevent compaction of the existing soil. Care shall be taken to redirect stormwater runoff from this area to prevent ponding. Installation of this system shall occur under dry weather conditions and system shall be backfilled immediately to prohibit the introduction of fines or other material that would compromise the functionality of this system. Removal of Sediment and Erosion Controls At the completion of construction activities and after receiving approval from the Town of Lexington, all physical sediment and erosion controls shall be removed from the site per Town of Lexington. The areas where the controls have been removed shall be seeded and stabilized immediately upon removal.

Long-Term Inspection and Maintenance Measures after Construction

Erosion Control

Eroded sediments can adversely affect the performance of the stormwater management system. Eroding or barren areas should be immediately re-vegetated. Inspection and Maintenance of Trench/Area Drain The area drain shall be inspected six (6) times per year including the end of the foliage and snow removal seasons, and if necessary, any maintenance shall be performed so that it functions as designed. The yard drain shall be cleaned six times per year, or when sediment in the bottom of the sump reaches ½ the depth from the bottom of the invert of the lowest pipe in the basin. Inlet and outlet pipes should be checked for clogging.

Page 129: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Isolator Row

The Isolator Rows should be inspected at regular intervals and maintained when necessary to ensure optimum performance. At minimum, inspections shall be performed twice per year (e.g. spring and fall) and after every major storm. The visual inspection should ascertain that the system components are in working order and that there are no blockages or obstructions in the inlet row or filters. The inspection shall also quantity the accumulation of sediment and high water observation. The isolator rows shall be cleaned annually and when the inspections show that maintenance is necessary. Cleaning of an Isolator Rows shall be down during dry weather when no flow is entering the system. The use of a vacuum truck is generally the most effective and convenient method. The following steps shall occur:

• Remove/Open lid on inline drain manhole • Remove and clean flexstorm filter • Using a flashlight and stadia rod, measure depth of sediment and record on

maintenance log • If sediment is at or above 3” than maintenance is necessary • A fixed culvert cleaning nozzle with rear facing spread shall be used • Apply multiple passes of jetvac until backflush is clean • Vacuum structure sump as required • Replace all covers, grates, filters and lids • Record observations and actions in log • Inspect and clean catchbasins upstream from the subsurface infiltration facility.

Subsurface Infiltration Facility

The infiltration system inspections should include inspections following the first several rainfall events or first few months after construction, after all major storms (3.2” inches of rain over a 24-hour period or greater), and on regular bi-annual scheduled dates, to ascertain whether captured runoff drains within 72 hours following the event. Ponded water inside the system (as visible from the observation well) after several dry days often indicates that the bottom of the system is clogged. If the water does not drain, then a qualified professional should be retained to determine the cause of apparent infiltration failure and recommend corrective action. Such corrective action should be immediately implemented by the homeowner. If depth of sediment is observed to be greater than 3” then the system should be cleaned. The homeowner shall contact a sewer and drain cleaning company to flood the system via pump truck so the water is forced back to the upstream cleanout where sediment can be vacuumed out.

Debris and Litter Removal Trash may collect in the BMP’s, potentially causing clogging of the facilities. All debris and litter shall be removed when necessary, and after each storm event. Sediment and debris collected from vacuuming and/or sweeping should be disposed of at a permitted waste disposal facility. Avoid disposing of this material on site, where it could be washed into the proposed subsurface infiltration systems.

Page 130: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Lawn Mowing All lawn mowing to take place will be done with a mulch mower so grass clippings will not be an issue.

Good Housekeeping Practices (in accordance with Standard 10 of the Stormwater Management Handbook to prevent illicit discharges)

Provisions for storing paints, cleaners, automotive waste and other potentially hazardous household waste products inside or under cover • All materials on site will be stored inside in a neat, orderly, manner in their appropriate

containers with the original manufacturer’s label. • Only store enough material necessary. Whenever possible, all of a product shall be

used up before disposing of container. • Manufacturer, local, and State recommendations for proper use and disposal shall be

followed.

Vehicle washing controls • A commercial car wash shall be used when possible. Car washes treat and/or recycle

water. • Cars shall be washed on gravel, grass, or other permeable surfaces to allow filtration to

occur. • Use biodegradable soaps. • A water hose with a nozzle that automatically turns off when left unattended.

Requirements for routine inspection and maintenance of stormwater BMPs • See Inspection and Maintenance Measures after Construction.

Spill prevention and response plans • Spill Control Practices shall be in conformance with the guidelines set forth in the

National Pollutant Discharge Elimination System (NPDES) Stormwater Pollution Prevention Plan (SWPPP)

Provisions for maintenance of lawns, gardens, and other landscaped areas • Grass shall not be cut shorter than 2 to 3 inches and mulch clipping should be left on

lawn as a natural fertilizer. • Use low volume water approaches such as drip-type or sprinkler systems. Water plants

only when needed to enhance root growth and avoid runoff problems. • The use of mulch shall be utilized where possible. Mulch helps retain water and

prevents erosion. Requirements for storage and use of fertilizers, herbicides and pesticides • Fertilizers used will be applied only in the minimum amounts recommended by the

manufacturer. Once applied, fertilizer will be worked into the soil to limit exposure to storm water. Storage will be in a covered shed. The contents of any partially used bags of fertilizer will be transferred to a sealable plastic bin to avoid spills.

• Do not fertilize before a rainstorm. • Consider using organic fertilizers. They release nutrients more slowly.

Page 131: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

• Pesticides shall be applied on lawns and gardens only when necessary and applied only in the minimum amounts recommended by the manufacturer.

Pet waste management • Scoop up and seal pet wastes in a plastic bag. Dispose of properly, in the garbage.

Provisions for solid waste management • All solid waste shall be disposed of or recycled in accordance with local town

regulations.

Snow disposal and plowing plans relative to Resource Area • Snow shall be plowed and stored on gravel, grass, or other permeable surfaces to allow

filtration to occur. • Once snow melts all sand salt and debris shall be extracted from surface and properly

disposed of. • Snow shall not be disposed of in any resource area or waterbody. • Avoid disposing snow on top of storm drain catchbasins or stormwater drainage swale.

Winter Road Salt and/or Sand use and storage restrictions • Sand storage piles should be located outside the 100-year buffer zone and shall be

covered at all times. No salt to be stored or used on site. • Alternative materials, such as sand or gravel, should be used in especially sensitive

areas.

Roadway and Parking Lot sweeping schedule • Pavement sweeping shall be conducted at a frequency of not less than once per year. • Removal of any accumulated sand, grit, and debris from driveway after the snow melts

shall be completed shortly after snow melts for the season. Documentation that Stormwater BMPs are designed to provide for shutdown and containment in the event of a spill or discharges to or near critical areas or from LUHPPL

Not Applicable

Training for staff or personnel involved with implementing Long-Term Pollution Prevention Plan

To be determined by the owner. List of Emergency contacts for implementing Long-Term Pollution Prevention Plan

To be determined by the owner.

Page 132: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

Applicant’s Certification

I certify under penalty of law that I have read, understand and agree to abide by the practices outlined in this document. Signed:______________________________ Date:________________ 12 Summit Road, LLC

Contractor’s Certification

I certify under penalty of law that I have read, understand and agree to abide by the practices outlined in this document. Signed:______________________________ Date:________________ Contractor

Page 133: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

STORMWATER MANAGEMENT CONSTRUCTION PHASE

INSPECTION SCHEDULE AND EVALUATION CHECKLIST

PROJECT LOCATION: 12 Summit, Lexington, MA WEATHER: ________________________ Inspection

Date Inspector Area Inspected Required Inspection Frequency if BMP Comments Recommendation

Follow-up Inspection Required

(yes/no)

Filtermitt Weekly and After Major Storm Events

Construction Tracking Pad

Weekly and After Major Storm Events

Area/Trench Drains Weekly and After Major Storm Events

Subsurface Infiltration System

Weekly and After Major Storm Events

(1) Refer to the Massachusetts Stormwater Handbook, Volume Two: Stormwater Technical Handbook (February 2008) for

recommendations regarding frequency for inspection and maintenance of specific BMP’s. (2) Inspections to be conducted by a qualified professional such as an environmental scientist or civil engineer. Limited or no use of sodium chloride salts, fertilizers or pesticides recommended. Other notes: (Include deviations from: Con. Comm. Order of Conditions, PB Approval, Construction Sequence and Approved Plan) Stormwater Control Manager: ____________________________________________________

Page 134: 12 SUMMIT ROAD PUBLIC BENEFIT DEVELOPMENT DEFINITIVE ...

STORMWATER MANAGEMENT AFTER CONSTRUCTION

INSPECTION SCHEDULE AND EVALUATION CHECKLIST

PROJECT LOCATION: 12 Summit Road, Lexington, MA WEATHER: ________________________ Inspection

Date Inspector Area Inspected Required Inspection Frequency if BMP Comments Recommendation

Follow-up Inspection Required

(yes/no)

Water Quality Units Bi-annually and After Major Storm Events

Area/Trench Drain Bi-annually and After Major Storm Events

Isolator Rows Bi-annually and After Major Storm Events

Subsurface Infiltration System

Bi-annually and After Major Storm Events

(3) Refer to the Massachusetts Stormwater Handbook, Volume Two: Stormwater Technical Handbook (February 2008) for

recommendations regarding frequency for inspection and maintenance of specific BMP’s. (4) Inspections to be conducted by a qualified professional such as an environmental scientist or civil engineer. Limited or no use of sodium chloride salts, fertilizers or pesticides recommended. Other notes: (Include deviations from: Con. Comm. Order of Conditions, PB Approval, Construction Sequence and Approved Plan) Stormwater Control Manager: ____________________________________________________