1 Williams, Kenneth From: Williams, Kenneth Sent: Monday, February 27, 2017 3:15 PM To: 'Sebastian Sandoval' Cc: Sauder, Ryan Subject: RE: Wellers Corner-STPL 2016-0049 Yes, please forward a PDF of the revised response letter. Thanks From: Sebastian Sandoval [mailto:[email protected]] Sent: Monday, February 27, 2017 2:39 PM To: Williams, Kenneth <[email protected]> Cc: Sauder, Ryan <[email protected]> Subject: RE: Wellers Corner‐STPL 2016‐0049 Ken, We left a hard copy of the response letter with Ryan, there only 2 responses that needed to be updated. Ryan, let me know if you need a PDF of the response letter. Thanks SS Sebastian Sandoval P.E. J2 Engineers, Inc. Office: 703-361-1550 ext. 326 From: Williams, Kenneth [mailto:[email protected]] Sent: Monday, February 27, 2017 2:04 PM To: Sebastian Sandoval Cc: Sauder, Ryan Subject: RE: Wellers Corner-STPL 2016-0049 Hi Sebastian, I was expecting a revised response letter but unless Ryan needs that for his review the email below will suffice. Thanks for the PDF of the updated sheets. Ken From: Sebastian Sandoval [mailto:[email protected]] Sent: Monday, February 27, 2017 1:06 PM To: Williams, Kenneth <[email protected]> Cc: Sauder, Ryan <[email protected]> Subject: Wellers Corner‐STPL 2016‐0049 Ken,
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Yes, please forward a PDF of the revised response letter. Thanks
From: Sebastian Sandoval [mailto:[email protected]] Sent: Monday, February 27, 2017 2:39 PM To: Williams, Kenneth <[email protected]> Cc: Sauder, Ryan <[email protected]> Subject: RE: Wellers Corner‐STPL 2016‐0049 Ken, We left a hard copy of the response letter with Ryan, there only 2 responses that needed to be updated. Ryan, let me know if you need a PDF of the response letter. Thanks SS Sebastian Sandoval P.E.
J2 Engineers, Inc. Office: 703-361-1550 ext. 326
From: Williams, Kenneth [mailto:[email protected]] Sent: Monday, February 27, 2017 2:04 PM To: Sebastian Sandoval Cc: Sauder, Ryan Subject: RE: Wellers Corner-STPL 2016-0049 Hi Sebastian, I was expecting a revised response letter but unless Ryan needs that for his review the email below will suffice. Thanks for the PDF of the updated sheets. Ken
From: Sebastian Sandoval [mailto:[email protected]] Sent: Monday, February 27, 2017 1:06 PM To: Williams, Kenneth <[email protected]> Cc: Sauder, Ryan <[email protected]> Subject: Wellers Corner‐STPL 2016‐0049 Ken,
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I hope you are well….as discussed this morning and as a follow up to a meeting with had with Ryan and Jimmy, we went ahead and added routing calculations to the plan set, and while the sheets affected simply had calculations and details added there was a storm manhole structured (#11) that was added at the end of Village View Terrace‐see sheet 4. Attached is PDF of the sheets inserted to Ryan’s set. Please let me know if anything else is needed. Thanks SS Sebastian Sandoval, P.E. | Senior Project Manager
J2 Engineers, Inc. 4080 Lafayette Center Drive, Suite 330 Chantilly, Virginia 20151 Office: 703-361-1550 ext. 326 Fax: 703-956-6845 Mobile: 703-862-0400 [email protected] | www.j2engineers.com The information and files in this transfer is the property of J2 Engineers, Inc. (J2E), and has been prepared by J2E for exclusive use by its staff. It is provided herewith for information only and is not to be relied upon by any parties other than J2E staff and employees. Any reliance thereupon by any party other than J2E staff and employees shall be at that user's sole risk; and said user choosing to rely upon this information agrees, that by relying on it, he/she/they accepts full responsibility for all work related thereto and agrees to indemnify and hold J2E harmless from any and all liability arising from or relating to the use of or reliance upon said information. The information and files are and shall remain the property of J2E; however J2E exclusively permits the recipient to use the documents/files for information and reference in connection with the project. The party receiving this information is responsible for requesting any future updated and/or current copy of the information hereon prior to considering this information final. No update notification will be sent. Any comments or questions are to be directed in writing to the principals of J2E. BY USING THE PROVIDED PLANS, PLATS, COMPUTATIONS AND/OR CAD FILES, THE RECIPIENT AGREES TO THESE TERMS AND CONDITIONS.
GRAPHIC SCALE0
( IN FEET )
1 INCH = FEET
10 20 40
20
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PROP. SAN. SEW. ESM'T LABELESM'T WIDTH
PROP. WATER ESM'T LABELESM'T WIDTH
PROP. PUBLIC ACCESSESM'T LABEL
PROPOSED ROADWAY
5' PROP. SW (unless otherwise noted)
PERVIOUS PAVEMENT
PROPOSED CONTOUR
EXISTING CONTOUR
CLEARING & GRADINGPROPOSED LIMITS OF
EXISTING TREE LINE
OVERLAND RELIEF
PROPOSED 0.5' CONTOUR
PROPOSED 1' CONTOUR
OLR
EXISTING SANITARY SEWER
PROPOSED WATER LINE
EXISTING WATER LINE
PROPOSED SANITARY SEWER
PROPOSED 6" PVC UNDERDRAIN
EXISTING STORM DRAIN
PROPOSED FIRE HYDRANT
3/4" WATER METER CROCK
4" SANITARY LATERAL
PROPOSED CG-12 HC RAMPS(SEE SHEET 02)
CURB TRANSITION
VEHICLES PER DAY
DRY SWALE
WALL
TEST PIT
NOTES1. ALL ROADS ARE CATEGORY B1, UNLESS OTHERWISE
NOTED ON PLANS.2. MAX POSTED SPEED = 15 MPH3. ALL STREETS AND TRAVELWAYS ON SITE SHALL BE
PRIVATELY OWNED AND MAINTAINED4. CONTRACTOR SHALL VERIFY LOCATION OF ALL
EXISTING UTILITY CROSSINGS WITH PROPOSEDUTILITIES ON THIS PLAN WITH A TEST PIT.
5. ALL TRAVELWAYS ARE 25' WIDE (FOC TO FOC)UNLESS OTHERWISE NOTED.
6. HEAVY DUTY CLEANOUT COVER TO BE USED ONALL SANITARY CLEANOUTS IN THE TRAVELWAY.
7. NO DECKS OR OVER HANGS ALLOWED IN LOUDOUNWATER EASEMENTS
8. WATER METER BOXES LOCATED IN DRIVEWAYMUST BE TRAFFIC RATED PER APPROVEDMATERIALS
9. SEE SHEET 13 FOR PERVIOUS PAVEMENT ANDUNDER DRAIN DETAILS
PROP. LINE OF SIGHT ESM'T LABEL
Summary for Subcatchment 4S: OUTFALL A - POST-ENERGY
Project: 0From To Drainage C C x A Inlet Rain Runoff Invert Elev. Length Slope Dia. Capacity VEL. FlowPoint Point Area Factor Increment Cumm. Time Fall Q Upper Lower Q Time
Min. In/Hr C.F.S. End End FT. % IN. C.F.S. F.P.S. MIN.*
Outlet JUNCTION LOSS InletINLET UPSTREAM Water Do Qo Lo Sfo Hf 1.3 0.5 FINAL Water RIM STATION INLET Surface Vo Ho Qi Vi QiVi 2 Hi Angle Hd Ht Ht Ht H Surface ELEV.
Elev. in cfs ft % ft Vi /2g Elev.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
1 YEAR ENERGY - POND OUTLET HYDROGRAPH 10 YEAR FLOOD - POND OUTLET HYDROGRAPH
2.17
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Lic. No. 45207
NOTE:
THE OWNER IS RESPONSIBLE FOR MAINTENANCE OF THE PERMEABLE PAVEMENT TO THE EXTENT NOT MAINTAINED BY LOUDOUN COUNTYPERSUANT TO SECTION 1096.02 OF THE CODIFIED ORDINANCE. FURTHERMORE, MAINTENANCE RESPONSIBILITIES SHALL BE ESTABLISHED INTHAT REQUIRED DEED OF EASEMNT AND RESERVATION
PERMEABLE PAVEMENT DESIGN (POROUS ASPHALT)
3"
2"
12" MINIMUM
8"
PERMEABLE PAVEMENTPermeable Pavement Information
Pervious Pavers Design Level LEVEL 1
Impervious Area (Ac) 1.62 ac
Tv (cf) (From VRRM spredsheet) (SEE SHEET 10) 5587 ft3
Drainage Area
Permeable Pavement Surface Area 25482 ft2
External Contributing Impervious Area 45085 ft2
Ratio 1.77 < 2
Depth of Stone Reservior Layer, dstone (ft) (Equation 7.1)
P=Rainfall Depth 0.083 ft
AI=Contributing impervious drainage area 70567 ft2
RvI=Volumetric runoff coefficient for impervious cover 0.95
Ap=Area of permeable pavement 25482 ft2
Nr=Porosity of reservoir layer 0.4
dstone =[(P X AI X RvI) + (P X AP)] / (Nr x AP) 0.75 ft
Maximum Reservior Depth, dstone‐max (Equation 7.2)
i=Field‐verified infiltration rate for the native soils 1 in/hr
td=Maximum allowable drain time 48 hours
Nr=Porosity of reservoir layer 0.4
dstone‐max=(0.5 X i X td) / (Nr X 12) 5.00 ft
Volume of Stone Reservior Layer, V
dstone =[(P X AI X RvI) + (P X AP)] / (Nr x AP) 0.75 ft
SA=Permeable Pavement Surface Area 25482.00 ft2
V = DSTONE X SA 19198.07 ft3
Volume of Stone Reservior Provided 19447.05 ft3
Trench Conversion
Lengh of Trench, L 846.26 ft
Width of Trench, W 6 ft
Min Depth of Trench = V / (L*W) 3.78 ft
Min Depth of Trench Provided 3.83 ft
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DRY SWALE DESIGNDRY SWALEDry Swale Information
Dry Swale Design Level LEVEL 1
Dry Swale Soil Media, Vr. 0.25
Gravel, Vr 0.4
Surface Storage behind check dams, Vr 1
Tv (cf) (From VRRM spredsheet) 778 ft3
Dry Swale Design Depths
Depth of Soil Media 2 ft
Depth of Gravel 1.75 ft
Surface Ponding Depth 0 ft
Equivalent Storage Depth
= (Soil Depth x Vrs)+(Gravel Depth x Vrg)+ Ponding Depth 1.200 ft