SDMS DocID 454824 GE - Superfund Records … · SDMS DocID 454824 GE ... measures required to be installed on the banks of Silver Lake under the Consent ... (Trustees) relating to

SDMS DocID 454824

GE 159 Plastics Avenue Pittsfield. MA 01201 USA SLipcrfun(d Records Ceiuci

SITE: Ct-ho^i2^£ BREAK: ICA OTHER: HSHllZ^

July 2, 2009

Mr. Dean Tagliaferro EPA Project Coordinator United States Environmental Protection Agency c/o Weston Solutions, Inc. 10 Lyman Street Pittsfield, MA 01201

Re: GE-Pittsfielcl/Housatonic River Site Silver Lake Area (GECD600) Responses to Trustee Comments Regarding Natural Resource Restoration/Enhancement

Measures for Banks of Silver Lake

Dear Mr. Tagliaferro:

On March 4, 2009, the U.S. Environmental Protection Agency (EPA) issued a letter to the General Electric Company (GE) conditionally approving GE's Revised Conceptual Removal Design/Removal Action (RD/RA) Work Plan for Soils Adjacent to Silver Lake, which GE had submitted on October 22, 2008. One ofthe conditions in that letter related to the natural resource restoration/enhancement (NRRE) measures required to be installed on the banks of Silver Lake under the Consent Decree (CD) for the GE-Pittsfield/Housatonic River Site and accompanying Statement of Work (SOW) for Removal Actions Outside the River. Specifically, EPA directed GE to provide a revised submittal addressing the comments ofthe natural resource trustees (Trustees) relating to "the walking path, the picnic areas, and the tree and shrub plantings" on the Silver Lake banks. Those comments had been included in a December 23, 2008 letter from the Lead Administrative Trustee to GE, which was attached to a separate conditional approval letter from EPA, dated March 2, 2009, for GE's July 3, 2008 Conceptual RD/RA Work Plan for the Silver Lake Sediments. EPA stated that GE should provide the revised submittal addressing those comments prior to the submittal of a combined Final RD/RA Work Plan for both the Silver Lake sediments and the soils adjacent to the lake.

This letter constitutes the revised submittal required by EPA. In accordance with EPA's March 4, 2009 letter, this letter is limited to addressing the Trustees' comments relating to the above-referenced NRRE measures for the Silver Lake banks. The Trustees' comments relating to the NRRE measures to be implemented within Silver Lake itself, including the shallow-water shoreline shelf and scrub-shrub island, as well as other design matters pertaining to those measures, have been addressed in GE's Revised Conceptual RD/RA Work Plan for the Silver Lake Sediments (submitted on April 15, 2009) and/or will be addressed further in the Final RD/RA Work Plan for both the sediments and soils.

It is important to note that the SOW specifies that the NRRE measures to be installed on the Silver Lake banks (i.e., the walking path, picnic areas, plantings) will be installed in "non-privately-owned areas" along the eastem and northern sides ofthe lake (SOW, Attachment 1, pp. 17, 19, 20). At the time the SOW was prepared, it was believed that the recreational areas on the eastem and northern sides of the lake were publicly owned. However, GE's recent review of deeds records has revealed that the

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CorpofOie Enwfonmenlal Programs

recreational areas along the eastem and northem sides ofthe lake are in fact privately owned - with the portions of those areas on Silver Lake Boulevard owned by GE and Westem Massachusetts Electric Company (WMECo) and the portion along Fourth Street owned by entities and persons that no longer exist (Pittsfield Industrial Development Company and some individual heirs). However, the City has easements through these properties for City streets. GE is currently discussing with EPA, the Trustees, and the City of Pittsfield mechanisms for the portions of the bank properties between Silver Lake Boulevard and the lake to be transferred to the City so that the walking path and associated structures can be placed in publicly owned areas, as provided in the SOW. In this situation, the responses set forth below in this letter are premised on the assumption that these properties will be transferred to the City. GE will continue to update EPA and the Trustees on the status of any such transfers of ownership and any related changes that may be required to the plans discussed herein.

It should also be noted that, although the SOW calls for the installation of picnic areas (as well as a walking path and tree/shrub plantings) on the Silver Lake banks, it has been determined, based on discussions with EPA, the Trustees, and the City, that it would be preferable to have benches along the walking path in lieu of picnic areas. As a result, GE's current plans for these NRRE measures provide for the installation of benches, rather than picnic areas, at a number of locations along the proposed walking path, as discussed further below.

Set forth below are each ofthe Trustees' December 23, 2008 comments pertaining to the NRRE measures for the Silver Lake banks (in italics), followed by GE's response.

Walking Path

1. Walkway Width: Trustees agree with a minimum width of 5 ' but suggest increasing the width by 1-2' especially in areas along the shoreline with viewsheds of the City and the Berkshires. We also recommend installation of benches at such locations for users to enjoy the lake and views.

GE Response: In consideration of comments by the Trustees and the City in recent discussions regarding the walking path, and in light of plans for re-use put forth by the Pittsfield Economic Development Authority (PEDA), the walking path alignment has been modified. Attachment A consists of a conceptual design drawing package summarizing the proposed layout and alignment, select cross-sections, and construction details of the walking path. As illustrated on Drawing C-101 in Attachment A, the walking path will extend along Silver Lake Boulevard from new crosswalks installed at the intersection of Silver Lake Boulevard and Fourth Street to a point about 125 feet south ofthe new outfall to Silver Lake from the new PEDA stormwater basin. The design width ofthe proposed walkway along this entire length is 5 feet. In addition, nine bench locations have been included along the northern and eastern shores of Silver Lake to promote use ofthe path. To provide access to these bench areas, and to allow improved lake views, additional pathways, approximately 4 feet in width branch off from the main path and lead to concrete pads on which the benches will be installed. Additional details regarding the construction of the walking path and associated bench locations can be found in Attachment A.

2. Walkway Material: We recognize that Technical Attachment I specifies a walking path covered with crushed stone. However, we suggest GE explore and compare benefits of various soft surface and hard surface products in terms of maintenance/erosion issues and multi-functional goals including public use. Trustees strongly advocate soft-surfaces to mitigate non-point source pollution, but recognize that hard surface/porous products have been developed which may also be feasible.

GE Response: The walking path will be constructed across remediated and non-remediated areas along the alignment shown on Drawing C-101 (in Attachment A). The existing surface will be cleared of vegetation and excavated or filled to location-specific grades. The finished walking path will be composed of 5 distinct layers - a geotextile fabric layer, three layers of subgrade stone, and a finished permeable surface layer. Initially, a Mirafi 500x (or comparable) woven geotextile fabric will be placed over the rough graded surface. A 2-inch layer of y4-inch crushed stone will be placed on the geotextile fabric, over which 7 inches of 1 '/2-inch crushed stone will be placed, followed by an additional 2-inch layer ofthe y4-inch crushed stone placed on top. These materials have been selected to meet Massachusetts Highway Department Section M2 materials specifications M2.01.4 (for y4-inch crushed stone), and M2.01.1 and M2.01.2 (for ]'/2-inch crushed stone). Following receipt ofthe Trustees' December 23, 2008 letter, and in consultation with the City of Pittsfield considering the eventual land transfer to the City, a 3-inch layer of porous bituminous concrete has been selected as the finished surface for the walking path. The entire system (i.e., the porous surface material and type/thickness ofthe gravel subgrade layers, along with the adjacent gravel infiltration trenches) has been designed to infiltrate and temporarily store the rainfall associated with the approximate 10-year storm event, thus reducing erosion concems related to rainfall-runoff. Additional details related to the composition ofthe walking path can be found in Attachment A.

3. The walkway should be graded away from the lake for drainage. It should not be immediately proximal to the lakeshore, if possible, to minimize bank erosion from drainage off the surface, and provide wildlife with a buffer for shoreline and emergent habitat use without disturbance.

GE Response: As illustrated on the figures included in Attachment A, to the extent practicable, the proposed walkway alignment follows the approximate top of bank, and is typically 10 to 20 feet away from the edge of water; creating a buffer space between the walkway and water to minimize any direct runoff to the lake and promote wildlife population development. The finished surface of the path will be graded to slope towards Silver Lake Boulevard such that runoff water from the walkway will be directed away from the lake. To the extent practicable, bank areas immediately adjacent to the walkway will be shaped to match surrounding grades with maximum allowable slopes of 2:1, will be covered with a minimum of 4 inches of topsoil, and will be planted with appropriate herbaceous seed mixes to match the surrounding NRRE planting mix.

4. The cross-section of the walkway/guardrail/top of shoreline will vary depending on existing slopes. Trustees suggest moving the walkway closer to the shoreline in wider areas to take advantage of viewsheds. In other areas, the walkway will be close to the guardrail, but for the majority of the shoreline, the walkway can be placed 5 'from the guardrail.

GE Response: During preparation of the Final RD/RA Work Plan, the most appropriate specific location will be considered for the walking path in coordination with the Trustees and the City of Pittsfield and in accordance with Attachment I to the SOW. As discussed in the response to the prior comment, the walkway will typically be located along the approximate top of bank.

5. Trustees suggest the guardrail be replaced with a more rustic/wood material, or replace the metal rail with wood and retain the metal posts. Portions ofthe existing guardrail will need to be modified in order to allow pedestrian movement from the proposed crosswalks.

GE Response: Completion ofthe remedial activities associated with the Silver Lake Area will likely require removal ofthe existing guard rail along Silver Lake Boulevard. GE notes the material suggested by the Trustees for the replacement guardrail and will discuss the guardrail composition, construction, and alignment with the City. Further, during preparation of the Final RD/RA Work

Plan, the most appropriate locations for crosswalks and entry points associated with access to the walking path will be selected in coordination with the Trustees and the City.

6. Access: Pathway alignment and access should correlate with existing sidewalks and reuse projections by PEDA for the area, e.g. access to the pathway could occur at both ends and possibly at 1-2 intervals along Silver Lake Blvd, dependent on reuse projections by PEDA. Due to steep banks and limited area, a portion of the walkway on the eastern shoreline should be eliminated and not extended to the intersection of East Street,

GE Response: The proposed walkway will extend from the Fourth Street intersection along the northern and eastem shore of Silver Lake, and will terminate just south of the new PEDA outfall (rather than extending to East Street), as further detailed in the design drawings included in Attachment A.

7. Picnic Areas: Trustees do not recommend locating a picnic area @ the intersection with East Street. Another more appropriate location along the northern shoreline would be recommended.

GE Response: As noted above, based on discussions with the City, EPA, and the Trustees, it was determined to substitute benches with viewsheds for picnic areas. In light of these discussions, it is currently anticipated that no picnic areas will be placed around Silver Lake, and that, instead, benches will be installed at nine locations along the proposed walking path, as illustrated in design drawings included in Attachment A.

Bank Plantings

1. // is unclear how the NRD plantings identified in Technical Attachment I to the SOW are going to be performed in conjunction with the installation of the walking path and Bank Soils removal. GE should provide a clear description of the integration of these activities in the Final RD/RA Work Plan.

GE Response: GE will describe the integration of these activities in the Final RD/RA Work Plan.

2. Trees and shrubs: Trustees recommend changing the location of the shrubs and trees, such that shrubs are planted nearest the cap armor versus the trees. • Shrubs: In lieu of oblong patches, shrubs should be planted in two rows with alternating spacing,

at the originally prescribed distances from the mean high water/armor edge and the individual spacing requirement of 4'. Total number of shrubs should at least equal the originally specified numbers based on the oblong patches but may need to be augmented dependent on the requirement to populate all shoreline areas.

• Trees should be planted above the bank from the shrubs at the original space separation (from the shrubs). The performance criteria state that black willow and eastern cottonwood be planted as a single line of trees @ 8 ' on center; however, we recommend that tree separation could be greater than 8 ' (10-12') and the size be increased to at least 2-1/2" - 3 " caliper, with percent survivability increased to 100% in such areas. Tree species may also include silver maple.

GE Response: A double row of shmbs will be planted with staggered alignment along the bank of Silver Lake with a maximum spacing of 5 feet on center between plantings. The first row of shrubs will be planted a minimum of 2 feet from the top edge ofthe bank armoring system. In addition, a single row of trees will be planted at the approximate top of bank (i.e., further up the bank from the shrubs). In accordance with the Trustees' request, new tree species with an approximate caliper size

of 2/2 to 3 inches will be installed, with an approximate spacing of 12 feet on center. Trees will maintain a minimum distance of 6 feet from the new walking path. Tree species to be planted include black willow (Salix nigra), silver maple (Acer saccharinum) and eastem cottonwood (Populus deltoids). Following installation, the 80% survivability Performance Standard specified in Attachment I to the SOW will be maintained for the newly planted trees and shrubs. Additional details related to NRRE planting plans are summarized in design Drawings C-103 and C-502 in Attachment A.

3. Presently, the shoreline of the lake supports a predominantly hardwood overstory and a mixed understory of trees, shrubs and vines. This vegetation provides multi-use habitat for a variety of migratory birds. We assume that clearing of vegetation for bank soil removal and shoreline armoring will entail removal of most, if not all, of the existing vegetation. We recommend that habitat commensurate with existing habitat should be replaced around the entire lake, not just with the proposed woody plantings along the eastern and northern perimeters and herbaceous seeding elsewhere.

GE Response: NRRE areas will be restored in accordance with the proposed design presented in GE's response to the prior comment. Affected private parcels will generally be restored to be consistent with the existing type of surface and vegetation, in consideration of the bank habitat characterization results presented in Section 2.4 the Pre-Design Investigation Report for Silver Lke Sediments (revised September 2004). Prior to construction, GE will initiate discussions with property owners regarding the details of parcel-specific restoration.

4. Invasive species monitoring and control should be included in long-term monitoring operations for all re-vegetated bank and shoreline areas and submerged aquatic habitat.

GE Response: An invasive species control plan will be included in the Post-Removal Site Control Plan that will be included either in the Final RD/RA Work Plan or in a subsequent Supplemental Infonnation Package. At a minimum, the invasive species control plan will provide for periodic inspections ofthe NRRE areas and application of herbicides targeting the plant species included on the Massachusetts Invasive Species list (copy in Attachment B) for a specified number of years following the completion of restoration activities.

Please call me ifyou have any comments or questions about these responses or the attached plans.

Sincerely,

/ f ^ ( >r Richard W. Gates Remediation Project Manager

Attachments

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cc: Richard Fisher, EPA Susan Svirsky, EPA Tim Conway, EPA Holly Inglis, EPA Rose Howell, EPA* K.C. Mitkevicius, USAGE Michael Gorski, MDEP* Susan Steenstrup, MDEP (2 copies) Jane Rothchild, MDEP* Eva Tor, MDEP* John Ziegler, MDEP Nancy E. Harper, MA AG* Dale Young, MA EOEEA Kenneth Munney, USFWS Ken Finkelstein, NOAA Linda Palmieri, Weston (2 copies) Mayor James Ruberto, City of Pittsfield Deanna Ruffer, Director, Dept. of Community Development, City of Pittsfield James McGrath, Dept. of Parks and Recreation, City of Pittsfield William Hines, Sr., Executive Director, PEDA Barbara Landau, Noble & Wickersham Susan Peterson, CDEP Michael Carroll, GE* Roderic McLaren, GE* James Nuss, ARCADIS Mark Gravelding, ARCADIS James Bieke, Goodwin Procter Charles Nicol, Northeast Utilities Robert Dvorchik, WMECo Salvatore Giuliano, WMECo John Tulloch, WMECo Public Information Repositories GE Internal Repository

* cover letter only

ARCADIS

Attachment A

Conceptual Design Drawings

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SILVER LAKE WALKING PATH CONCEPTUAL DESIGN

LEGEND - EXISTING

ELECTRIC METER

IRON PIN FOUND

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SIGN

LIGHT POLE

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UTILITY POLE 4 GUT WIRE

CATCH BASIN

SANITARY MANHOLE

MONITORING WELL

APPROXIMATE PROPERTY LINE

EDGE OF TRAVELED WAY

BORDERING VEGETATED WETLANDS

TOP OF BANK ARMOR

WOODEN FENCE

WIRE FENCE

CHAIN LINK FENCE

OVERHEAD WIRES

GUARDRAIL

EDGE OF WATER

EXISTING CONTOURS

EDGE OF BUSHES/HEDGE

CONIFEROUS TREE

DECIDUOUS TREE

AREA OF MISC. DEBRIS

EXISTING SPOT GRADE

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NEW BENCH

NEW PAINTED CROSSWALK

NEW SPOT GRADE

DIRECTIONAL FLOW ARROW

NEW STONE INFILTRATION TRENCH

NEW GRADE

NEW WOOD RAILING

NEW RETAINING WALL

NEW WALKING PATH CENTERLINE AND STATIONING

NEW GUARDRAIL

NEW 6' WIDE WALKING PATH

SECTION

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INDEX OF SHEETS:

G-IOI - TITLE SHEET C-IOI - OVERALL SITE PLAN C-102 - SITE PLAN - ENLARGEMENTS C-103 - NEW PLANTING PLAN C-301 - PLAN & PROFILE STATION 0+00 TO 6+00 C-302 - PLAN & PROFILE STATION 6+00 TO 12+00

C-303 - PLAN & PROFILE STATION 12+00 TO 17+00

C-30Z. - PLAN & PROFILE STATION 17+00 TO 20+00

C-305 - BANK CROSS SECTIONS

C-501 - CONSTRUCTION DETAILS C-502 - CONSTRUCTION DETAILS

S U B J E C T TO THE ACOL iJ? iT iON OP PROPERTIES C U R R E N T L Y O W \ l £ D BV T H E - G > ; N E R A L . E L E C T R I G C O M P A N Y A N D THE W E S T E R N M A S S A C H U S E T T S E L E C T R i C C O M P A N Y 3Y ~HE CITY OF P iTTSF iELD.

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TOPOGRAPHIC SURVET PERFORRLED IN JANUARR/FEBRUARY 2006 AND RIAY 2006 BY WILL-ENGINEERS, ARCHITECTS, PLANNERS, INC

HORIZONTAL COORDINATE SYSTEM

UTILITIES ARE SHOWN IN AN APPROXIHATE WAY ONLY AND ALL UTILITIES HAT NOT BE SHOWN. PRIOR TO ANY CONSTRUCTION, TME CONTRACTOR SHALL CONTACT "DIG-SAFE" AND HAVE ALL UNDERGROUND UTILITIES HARKED ON TME GROUND

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WETLANDS DELINEATION PERFORMED BY NEW ENGLAND ENVIRONMENTAL,

THE 100-YEAR FLOOD PLAIN ELEVATION VARIES FROM APPROXIMATELY QM.4 + / - TO ^A^.B + / - FEET ("DEPENDING OFI LOCATION; AND IS BASED UPON ON FLOOD INSURANCE RATE MAP NO. 250037 0020 C, REVISED DATED FEBRUARY \°I, \°IS>2.

PEDA REDEVELOPMENT PLANS BASED UPON PLANS PROVIDED BY CLOUGH MARBOR ASSOCIATES INC. ON FEBRUARY 20, 200^

PROPOSED SILVER LAKE BOULEVARD AND EAST STREET INTERSECTION RECONSTRUCTION BASED UPON MASS HIGHWAY DRAWINGS (2SX COMPLETE AT TME PRESENT T I M E ; AND PROVIDED TO THIS OFFICE BY CLOUGM HARBOR ASSOCIATES ON FEBRUARY 20, 200=1.

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A.D. - -0 .02 K - 10.37

20 .00 ' VC

SCALE: I " .20'

PVI STA • 11+37.67

PVI ELEV - 164.26 A.D. - -0.01

K - 15.75 2 0 . 0 0 ' VC

O

N

S T A T O N I N G ( F E E T )

SILVER LAKE WALKING PATH - PROFILE SCALE: HORZ. l " -20 '

VERT. l " -2 '

SUBJECT CLIRRENTL CGiViPAN-^' ELEGTR'C ;

•C THE ACCUiSTION GF PROPERTIES Y 0\',/N£D 3--' "HE GENERAL ELECTRiC AND THE WES""ERN MASSACHUSETTS XJi^/IFANY a-: THE CITY OF PiTTSFIELD,

50 Depot Street Dolton, MA 01226 (413) 684-0925

41 Park Street Adorns, MA 01220 (413) 743-0013

www.hillengineer5.com

PRELIMINARY

NOT TO BE

USED FOR

CONSTRUCTION

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DATE DRAWN

SCALE

A P V O BY

2-12-09

AS-NOTED

CAD CODE:

GE-IIO6-O04-C-l0in.DWG

GRAPHIC SCALE.'

PROJECT NUMBER:

GE-1106-004

DRAWING NUWBER

C - 3 0 4

UPPER LIMIT OF EXISTING BORDERING VEGETATED WETLANDS f T T P I C A L ;

WALKING PATH "~

161

180

SILVER LAKE

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50 Depot Street Dalton, MA 01226 (413) 684-0925

41 Park Street Adams, MA 01220 (413) 743-0013

www.hillengineers.com

PRELIMINARY

NOT TO BE

USED FOR

CONSTRUCTION

f i t

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IP 13 .5 EE =

C-305

CROSS SECTION t*l

SCALE: r - 2 0 ' MORZ, l " -2 ' VERT.

CROSS SECTION «2

SCALE: l " -20' WORZ, r - 2 ' VERT.

CROSS SECTION #3

SCALE. l ' - 2 0 ' WORZ, l ' - 2 ' VERT

_WALKI1 PATH

184

163

182

161

160

SILVER LAKE

177

176

175

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2-12-Oq

AS-NOTED

CAD CODE

GE- l l06-004-C-IOin.DWG

G E - l i 0 6 - 0 0 4

CROS5 SECTION tt4

SCALE; l ' - 2 0 ' MORZ, l ' - 2 ' VERT.

DRAWING NUUBER

C - 3 0 5

GRADE SURROUNDING SIDESLOPES AT HAXIMUn 2.1. SEED AND nULCH, n iN IHUn 4" TOPSOIL.

5' WIDE WALKING PATH

_ 3 ' POROUS BITUMINOUS ASPHALT CONCRETE

niNinun T OF i i/2" CRUSHED O STONE MEETING MASS 0 HIGHWAY SPECIFICATIONS FOR 1-12.01.1 AND ri2.01.2

- UNDISTURBED SUBGRADE -

DO NOT COMPACT SUBGRADE PRIOR TO PATH INSTALLATION. CORRECT ANY OVEREXCAVATION WITH ADDITIONAL STONE INSTALLATION.

n iN IMun 2" OF 3/4" CRUSHED -STONE MEETING MASS

HIGHWAY SPECIFICATIONS FOR M2.0I.4

MINIMUM 2 ' OF 3/4" CRUSHED -STONE MEETING MASS

HIGHWAY SPECIFICATIONS FOR M2.0I.4

MIRAFI 500X (OR ZOUAL) STABILIZATION FABRIC

PIN HOLES AND SLOTS FOR 3/4 ' SETBACK WALL CONSTRUCTION

STRAIGHT SPLIT FACE

ACCENT UNIT

PIN MOLES AND SLOTS FOR 3/4' SETBACK WALL CONSTRUCTION

ill

STRAIGHT SPLIT FACE

COBBLE UNIT

PIN HOLES AND SLOTS FOR 3/4J SETBACK WALL CONSTRUCTION

STRAIGHT SPLIT FACE

STANDARD UNIT

SPLITTING GROOVE FOR HALF UNIT

-I f-

B-CAP ' A-CAP

[ Z Z D : [~~^ 3H'

GENERAL NOTES FOR CAPPING:

1, CAPS SHALL BE ADHERED TO WALL USING VERSA-LOK CONCRETE ADHESIVE.

2, CAPS MAY BE PLACED WITH A 1/2' TO 3 / 4 ' OVERHANG OF TOP COURSE,

3, WHEN SPLITTING CAP UNIT FOR WALL END DO NOT USE A CAP SECTION LESS THAN 6 ' WIDE,

4, DO NOT OVERHANG CAP AT END OF COURSE MORE THAN 1' .

FOR STRAIGHT WALLS, ALTERNATE A-CAP AND B-CAP

B-CAP A-CAP

ALWAYS START PLACEMENT FOR EACH COURSE AT THE CORNER AND WORK OUT INTO THE MIDDLE OF THE WALL.

SECOND COURSE |0"

FIRST COURSE

engmeers archilects plonners

50 Depot Street Dalton, MA 01226 (413) 684-0925

41 Pork Street Adams. MA 01220 (413) 743-0013

www.hlllengineers.com

PRELIMINARY

NOT TO BE

USED FOR

CONSTRUCTION

If" 5S:.

TYPICAL POROUS ASPHALT NALKING PATH - SECTION VERSA-LOK TYPICAL BLOCKS VERSA-LOK CAPPING DETAILS * NOTES

C-501 N.T.S

-SNAP OFF REMAINDER OF PIN ABOVE UNIT

3/4* SETBACK

VERSA-TUFF SNAP-OFF PIN, 2 PER UNIT]

F VERSA-TUFF SNAP-OFF PIN, 2 PER UNIT

ECEIVING SLOT

PINNING DETAIL

PINNING 4" HIGH ACCENT TO i , ' HIGH STANDARD/COBBLE

PINNING DETAIL

PINNING 6" HIGH STANDARD/COBBLE TO 4" HIGH ACCENT

4 V '

DRILL HOLE IN CAP AND REMOVE BACK OF UNITS AS NECCESARY FOR RAILING INSTALLATION

CAP UNIT ADHERES TO TOP UNIT W/VERSA-LOK CONCRETE ADHESIVE

REMOVE BACK OF UNITS

REBAR SET IN 6" TWICK LAYER OF CONCRETE. EXTEND REBAR AND CONCRETE A MINIMUM OF 18" UNDER WALK.

«*5"

VERSA-TUFF SNAP-OFF PIN DETAIL

VERSA-LOK MOSAIC CONCRETE UNITS

CCOBBLE, ACCENT AND STANDARD UNITS;

FIRST COURSE OF BLOCKS BURIED AND LEVEL.

, • ; ACCENT .

COBBLE „

: •• r -TT-

ACCENT .

' •• ' vERSA-LOK

. . _ .STANDARD ' • .

. • _ ACCENT . ACCENT .

'VERSA-LOK •

• • .STANDARD • / . COBBLE ..

EW RAILING POST 8' ON CENTER

SEE DETAIL I ON THIS SHEET FOR WALKING PATH SECTION.

VERSA-GRID VG 3.0 WITH REINFORCED BACKFILL TYPE Ml.03.1

IRAFI I40N FILTER FABRIC

THICK CRUSHED STONE 12" n i N . TYPE M2.0I.4 4" DIA. DRAIN PIPE OUTLET e EACH END OF WALL

VERSA-LOK STANDARD UNIT ^BASE C O U R S E ;

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VERSA-LOK* • ^

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• COBBLE ..

• • . .. / ' - 1 * .

ACCENT..

,

GRANULAR LEVELING PAD '' ' MIN. 12' THICK ("TYPE M l . 0 3 . 1 ; .

COMPACTED TO 151 M.D.D COMPACTED -SUBGRADE -

BOTTOM OF WALL 176 .2 ' t TOP OF WALL 181 .{. ' t WALL LENGTH: 27 ' t BLOCK TYPE: VERSA-LOK MOSAIC WALL BASE MAYBE STEPPED BUT THE TOP OF THE WALL WILL BE AT THE SAME ELEVATION AND AT A MINIMUM THE FIRST COURSE OF BLOCKS SHALL BE BELOW GRADE. RESTORE TOPSOIL AND SEED/MULCH ALL LAWN AREAS AROUND THE WALL INSTALL WALL AS PER MANUFACTURERS SPECIFICATIONS.

GEOSTNTMETIC NOTES:

GEOSYNTHETIC GRID TO BE VERSA-GRID VG 3.0 ("1250 L B / F T ; . GRID TO BE INSTALLED AS PER MANUFACTURERS SPECIFICATIONS INSTALL AT THE APPROXIMATE MIDHEIGHT OF THE WALL ALONG THE ENTIRE LENGTH. CAREFULLY CUT VERSA-GRID AROUND POST. DO NOT SKIP SECTIONS AROUND POSTS OR SPLICE PIECES IN.

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DRAWN BY

DATE DRAWN

SCALE:

APVD BY

2-)2-C>q

AS-NOTED

CAD CODE

GE-t I06-004-C-IOin.DWG

GRAPHIC SCALE:

PROJEC"T "N UMBER:""

GE-1106-004

PIN AND nOSIAC PANEL CONFIGURATION DETAILS VERSA-LOK RETAINING WALL GEOSYNTHETIC PLACEMENT DRAWING NUUStR

C-501

8" DENSE GRADE CRUSHED STONE BASE COMPACTED TO 151 M.D.D. ( T T P ) MASS HIGHWAY TYPE M2.0I.7

NOTES:

x-^^-^ NATIVE SOIL COMPACTED TO 16% M.D.D. REPLACE UNSUITABLE NATIVE SOIL WITH MASS HIGHWAY TYPE Ml.03.Ob CTYP;

ALL BENCHES ARE TO BE BOLTED TO NEW POURED IN PLACE CONCRETE PAD. ALL PADS TO BE A MINIMUM OF 7 FEET LONG BY 4 FEET WIDE.

BENCHES MAY BE MOUNTED BY POURING ANCHOR BOLTS CMINIMUn )4 • BY 4" LONG; IN PLACE OR BY DRILLING AND INSTALLING AFTER CONCRETE HAS PROPERLY CURED.

FINISH GRADE

6" OF TOPSOl

SHRUB SHALL BEAR THE SAME RELATIONSHIP TO FINISH GRADE AS IT DID IN THE NURSERY.

FINISH GRADE

TOPSOIL C M I N ;

PLANTING MIX

CUT • REMOVE BURLAP FROM TOP 1/3 OF BALL, IF PLASTIC REMOVE ENTIRELY.

TYPICAL CONCRETE MOUNTING PAD FOR NEW BENCHES TTPICAL SHRUB DETAIL

FINISH GRADE

TREES WITH 2 i ' - 3 " CALIPER. TWO STAKES SET OPPOSITE AND INTO SUBGRADE WITH GUT WIRES AT 10 DEGREE ANGLE TO STAKES USING 10 GAUGE, GALVANIZED, SOFT STEEL WIRE AND TURNBUCKLE. TWO-PLY 1/2" DIA. REINFORCED RUBBER HOSE AND 2 ' SO, X b'-O" LONG CEDAR STAKES NOTCHED FOR WIRES.

PLANT TO A DEPTH OF I5"-16' PLANTING HOLE SHOULD BE NO DEEPER THAN THE ACTUAL DEPTH OF THE ROOTBALL PLANT TREE SO THAT THE ROOT FLAIR IS ABOVE THE SOIL LINE

REMOVE WIRE AND/OR ROPE AND REMOVE AS MUCH OF THE BAGGING MATERIAL AS POSSIBLE PARTICULARLY FROM THE TOP OF THE ROOTBAUL

fc" OF TOPSOIL; 6 ' TOPSOIL M I N ;

CUT t REMOVE BURLAP FROM TOP 1/3 OF BALL, IF PLASTIC REMOVE ENTIRELY.

j E J t C

RREf-J

,%,-•: PA.'"

- 0 " ^ r i i (

T T O '

TLY O

'HE AGCUISITION OF PROPERTIES

AJNED BY THE GENERAL ELECTRIC

Y AND THE VVcS ' ERM MASSACHUSE i : S

:; OOK (PANY BY THE CITY OF PiTrSFIELD,

engineers orchilects plonners

yy:--50 Depot Street Dolton. MA 01226 (413) 684-0925

41 Porte Street Adams, MA 01220 (413) 743-0013

www,hillengineers,com

PRELIMINARY

NOT TO BE

USED FOR

CONSTRUCTION

I TYPICAL TREE PLANTING DETAIL

C-502 'N.TS.

PLANTED TREE

STEM PROTECTOR

fc"» ASSEMBLED WELDED WIRE TREE PROTECTOR

FINISH GRADE

METAL STAPLE (& ' MIN ;

PLANTING SOIL MIXTURE PER NURSERY SPECIFICATIONS/RECOMMENDATION REFER TO DETAIL 2 ON SHEET C-503.

NEW ENGLAND WETMIX

S P E C I E S

Fox Sedge ( C a r e x v u \ p i n o i d c a )

Mop Sedge ( C a r e x [upuWna)

W a t e r P l a n t a i n CAl isnna p lan tago-aq ,ua t i ca , )

Nodd ing B u r M a r i g o l d ( 'B idcns c c r n u a )

L u r i d Sedge ( C a r e x \ u r \ d a )

S o f t Rush CJuncus e f f u s u s ^

G r o s s - l e a v e d G o l d e n r o d ("Sol idago g romin iFo l i a . )

B e a r d e d S e d g e ( C a r e x C o m o r o )

F r i n g e d S e d g e ( C o r a x c r \ r \ \ t a )

B o n e s e t C E u p o t o r i u m p e r f o l i a t u m . )

F l a t - t o p A s t e r ( A s t e r u m b e l l a t u s , )

M a r d - s t e m B u l r u s h ( S c i r p u s a c u t u s ^

G r e e n B u l r u s h CSc i rpus o t r o v i r c n s , )

Woo lg rass ( "Sc i rpus cype r i nus , ) -

S p o t t e d Joe P y c lueed C E u p a t o r i u m m a c u i a t u m )

B l u e V e r v a i n ( "Verbena has to ta , )

D i t c h S t o n e c r o p CPenthTorum s e d o i d e s ^

TOTAL

P E R C E N T

4 0

b

6

5

• 6

5

5

A

A

A

3

3

3

3

2

2

1

\00

PLANTING NOTES:

TREES:

TREES SHALL BE NURSERY STOCK WITH A CALIPER SIZE OF 2 i ' - 3". TREES SMALL DE PLANTED IN AN UNEVENLY SPACED MANNER ('APPROX1P1ATELY 12' ON CENTER^ IN A SINGLE ROW ROUGMLY ALONG THE TOP OF BANK TO SILVER LAKE. ALL THE TREES SHALL BE LOCATED AT LEAST A MIN inun OF 6 FEET ('HORIZONTALLY; FROM THE NEW WALKING PATH.

TREE SPECIES TO BE PLANTED: BLACK WILLOW ("Salix n igra l SILVER MAPLE ^Acer soccharinum; , j EASTERN COTTONWOOD CPopulus dcl to ides;

THE ACCEPTABLE TREE SPECIES WILL BE INSTALLED IN A RANDOM MIXED PATTERN TO ENSURE HETEROGENEOUS DISTRIBUTION OF THE SPECIES IN THE AREAS IDENTIFIED ON THE SITE PLAN.

SHRUBS SHALL BE CONTAINERIZED NURSERY STOCK 2' TO 3' HIGH. SHRUBS ARE TO BE INSTALLED IN DOUBLE ROW IN A RANDOM MIXED PATTERN TO ENSURE HETEROGENEOUS DISTRIBUTION OF TME SPECIES IN THE AREAS IDENTIFIED ON THE SITE PLAN. THE FIRST SHRUB ROW WILL BE LOCATED APPROXIMATELY 2-FEET BACK FROM THE TOP OF BANK ARMOR AND WILL BE INSTALLED 4-FEET ON CENTER. THE SECOND ROW WILL BE STAGGERED FROM THE FIRST AND TME 4-FOOT SPACING WILL BE MAINTAINED THROUGHOUT.

THE ACCEPTABLE SPECIES INCLUDE: NORTHERN ARROWWOOD ('Viburnum r<^co<zn\1urr\) WINTERBERRY ("Ilex ver t ic i l la ta ; RED-OSIER DOGWOOD ("Cornus sericca;

TREES AND SHRUBS WILL BE PLANTED DURING THE MONTHS OF APRIL OR MAY, OR (N OCTOBER OR NOVEMBER.

NEW ENGLAND WETMIX SEEDING NOTES:

APPLICATION RATE I LB PER 2500 SOUARE FEET

A LIGHT MULCH OF CLEAN, WEED-FREE STRAW SHALL BE SPREAD OVER THE SEED AREA. SEEDED AREA INLUDED EDGE OF ARMOR/WATER TO SECOND ROW OF NEW SHRUBS

NEW ENGLAND CONSERVATION / WILDLIFE SEED MIX

S P E C I E S

B i g B l u e s t e m ( A n d r o p o g o n g e r o r d i i ^

L i t t l e B l u e s t e m ( ' S c h i z o c h y r i u m scopo r iun - i ^

S u j i t c h g r o s s ( P a n i c u m v i r g a t u m , )

Fox S e d g e (Care jc vu lp ino idea, )

S i l k y Wi ld R y e ( E l y m u s v i l losus , )

C o m m o n M i l k u j e e d ( A s c l e p i a s s y r i o c a ^

D e e r t a n g u e f P c n i c u m c l andes t i num^ )

P e n n s y l v a n i a S m o r t L u c c d ( P o l y g o n u m p e n s y l v a n i c u m ^

P a r t r i d g e Pea ( C h o m a e c r i s t o fasc icu lo ta , )

S i l k y S m o o t h A s t e r ( "As te r laevis,)

Nodd ing B u r - n a r i g o l d ( B i d e n s cernua, )

F l a t - t o p A s t e r ( A s t e r u m b e l l a t u s . )

T O T A L

P E R C E N T

2 0

2 0

2 0

10

& 6

5

5

4

1.5

I

0 .5

100

NEW E N G L A N D C O N S E R V A T I O N / W I L D L I F E

S E E D I N G N O T E S :

A P P L I C A T I O N R A T E

F E E T

L B P E R 17S0 S O U A R E

A N O N - I N V A S I V E A N N U A L R Y E G R A S S ( " L E S S

T H A N 101 O F S E E D M I X T U R E ^ I S T O B E A D D E D

T O S E E D M I X T U R E .

A L I G H T M U L C H OF C L E A N , W E E D - F R E E S T R A W

S H A L L B E S P R E A D O V E R T H E S E E D E D A R E A .

S E E D E D A R E A I N C L U D E S S L O P E S B E T W E E N

L I M I T O F NEW S H R U B S A N D NEW T R E E L I N E .

DATE: DRAWN

I CAD CODE:.

| G E - I I O 6 - O O 4 - C - I 0 I M . D W G

^GRAPHIC SCALE:

SPPOJECT NUMBER:

i GE-110&-004

4 {TYPICAL TREE PROTECTOR DETAIL

'l C - h O I

ITREE, SHRUB, SEEDING REQUIREMENTS AND NOTES

i C-502

DRAWING NUMBER

C-502

ARCADIS

Attachment B

Massachusetts Invasive Species List

APPENDIX B MASSACHUSETTS INVASIVE SPECIES LIST

' COMMOi;NAME ' ; ,, . • :

Amur honeysuckle Autumn olive

Barnyar(d grass Black locust

Black swallow-wort Bittersweet nightshade

Bushy Rock-cress Canada bluegrass

Chervil Coltsfoot

Common barberry Common buckthorn

Common / hedge privet Common mullein

Creeping buttercup Curly pondweed Cypress spurge Dame's rocket

Eurasian water-milfoil Fanwort

. Garlic mustard Giant waterweed Glossy buckthorn

Goutweed or Hair fescue

Hairy willow-herb Japanese barberry

Japanese honeysuckle Japanese hops

Japanese knotweed Japanese privet Japanese rose

Kiwi vine Kudzu

Lesser naiad Live-forever or Orpine

Money wort Morrow's honeysuckle Morrow's X Tatarian

Multiflora rose Norway maple

Oriental bittersweet Phragmites, Reed grass

' , SCJENTIFIC NAME . • ,,

Lonicera maackii Elaeagnus umbellate Echinochloa crusgalli Robinia pseudoacacia Cynanchum louiseae Solarium dulcamara Cardamine impatiens

Poa compressa Anthriscus sylvestris

Tussilago farfara Berberis vulgaris

Rhamnus cathartica Ligustrum vulgare

Verbascum thapsus Ranunculus repens

Potamogeton crispus Euphorbia cyparissias Hespehs matronalis

Myriophyllum spicatum Cabomba caroliniana

Alliaria petiolata Egeria densa

Rhamnus frangula Aegopodium podagria

Festuca filiformls Epilobium hirsutum Berberis thunbergii Lonicera japonica

Humulus japonicus Polygonum cuspidatum Ligustrum obtusifolium

Rosa rugosa Actinidia arguta

Pueraria montana Najas minor

Sedum telephium Lysimachia nummulaha

Lonicera morrowii Lonicera xbella Rosa mutiflora

Acer platanoides Celastrus orbiculata Phragmites australis

6/24/2009 G:\GE\GE_Silver_Lake_Confidential\Reports and Presentalions\Restoration Plan for TrusteesWtachment B Page 1 of 2

APPENDIX B MASSACHUSETTS INVASIVE SPECIES LIST

coMiyipN;NAME . : : - y 2 : 2 ' : y A : Porcelain berry

Purple loosestrife Reed canary-grass

Russian olive Sea- or horned poppy

Sheep fescue Sheep-sorrel

Silver lace-vine Silver poplar

Spotted knapweed Sweet reedgrass Sycamore maple

. Tartarian honeysuckle Tree-of-heaven

True forget-me-not Water-chestnut

Watercress Wetsern catalpa White mulberry

Wild thyme Winged euonymus

Variable water-milfoil Yellow floating heart

Yellow iris

• ' y 2 A : ' y ' : J-.'SeiENTIFlC3NAME Ampelopsis brevipedunculata

Lythrum salicaria Phalaris arundinacea

Elaeagnus angustifolia Glaucium flavum

Festuca ovina Rumex acetosella

Polygonum aubertii Populus alba

Centaurea biebersteinii Glyceria maxima

Acer pseudoplatanus Lonicera tart ari ca

Ailanthus altissima Myosotis scorpioides

Trapa natans Rorippa nasturtium-aquaticum

Catalpa speciosa Morus alba

Thymus pulegioides Euonymus alata

Myriophyllum heterophyllum Nymphoides peltata

Iris pseudacorus

Notes: 1. Reference:

Weatherbee, P.B., P. Somers, T. Simmons. 1998. A Guide to Invasive Plants in Massachusetts. The Massachusetts Biodiversity Initiative. MassWildlife.

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