GE - HOUSATONIC RIVER, PROPOSAL TO REMOVE / REPLACE … · 2020-04-28 · Transmitted Via Overnight Courier October 30,2009 Mr. Richard Fisher U.S. Environmental Protection Agency

Transmitted Via Overnight Courier

October 30,2009

Mr. Richard Fisher U.S. Environmental Protection Agency EPA - New England One Congress Street, Suite 1100 Boston, Massachusetts 02114-2023

Re: GE-PittsfieldlHousatonic River Site Groundwater Management Area 1 (GECD3I0)

GE 159 Plastics Avenue Pittsfield, MA 01201 USA

East Street Area I-North, East Street Area I-South; East Street Area 2-North and East Street Area 2-South Removal Action Areas Proposal to RemovelReplace Monitoring Wells

Dear Mr. Fisher:

On April 11, 2008, the U.S. Environmental Protection Agency (EPA) issued a letter to the General Electric Company (GE) providing conditional approval of a December 12,2007 document relating to the East Street Area 2-South Removal Action Area (RAA) titled Addendum to Conceptual Removal Design/Removal Action Work Plan (Addendum). That conditional approval letter provided comments on the Addendum and required the preparation of a Second Addendum to the January 2006 Conceptual Removal Design/Removal Action Work Plan for East Street Area 2-South (Conceptual Work Plan). On April 21, 2009, GE submitted the Second Addendum to Conceptual Removal Design/Removal Action Work Plan for East Street Area 2 -South (Second Addendum), which provided responses to the comments included in EPA's April 11, 2008 letter and presented supplemental information supporting those responses. Consistent with the Conceptual Work Plan and Addendum, GE proposed to complete the remaining design-related activities and submit the Final Work Plan for the East Street Area 2-South RAA within six months of EPA approval of the Second Addendum.

The Conceptual Work Plan and the two Addenda describe the need for and proposed scope of soil-related response actions for East Street Area 2-South, Groundwater at East Street Area 2-South is included within the Plant Site 1 Groundwater Management Area (GMA 1). In general, the response actions for soil at East Street Area 2-South are anticipated to include soil removaVreplacement, pavement enhancement, installation of a vegetative engineered barrier, and restoration activities. This letter summarizes the modifications to the ongoing groundwater quality and non-aqueous phase liquid (NAPL) monitoring programs at GMA 1 that will be necessary to accommodate the implementation of the soil response actions at East Street Area 2-South, pmiicularly in regard to monitoring wells located within or adjacent to areas subject to soil-related response actions. Specifically, this letter describes GE's proposed approach to protect, remove, and/or replace celiain monitoring wells at East Street Area 2-South.

In addition, this letter contains proposals to decommission several other wells within the East Street Area I-NOlih, East Street Area I-South, East Street Area 2-North and East Street Area 2-South portions of GMA 1 that are not needed to suppOli GE's ongoing groundwater quality and NAPL monitoring programs. GE has previously proposed and implemented (following EPA approval) modifications to the monitoring well network at the Lyman Street Area, Newell Street Areas I and II, and the 20s/30s/40s

Carpol ate EnVironmental Programs

Mr. Richard Fisher October 30, 2009

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Complexes in conjunction with the soil-related response actions or redevelopment activities associated with those areas. Therefore, no additional proposals related to those pOltions of GMA 1 are provided.

Overview of GMA 1 MonitoringlRecovery Well Network Within East Street Area 2-South

One hundred and fifty-one groundwaterINAPL monitoring wells and thirteen recovery wells are currently located within East Street Area 2-South. Ninety-eight of these monitoring wells and all of the NAPL recovery wells are currently Palt of the GMA 1 groundwater qualitylNAPL monitoring and recovery well network. Table 1 contains a listing of the monitoring wells within East Street Area 2-South, along with their current usage (if any) and a brief description of any soil-related response actions to be performed in their vicinity. The monitoring well locations are illustrated on Figure 1, along with the limits of the soilrelated response actions to be conducted at East Street Area 2-South, as proposed in the Second Addendum.

Of the III wells currently utilized in the GMA 1 groundwater qualitylNAPL monitoring and recovelY well network within East Street Area 2-South:

• Seven monitoring wells are currently sampled under the interim groundwater quality monitoring program, currently in progress at GMA 1.

• Six other monitoring wells that were previously sampled under the baseline groundwater quality monitoring program for GMA 1 are currently utilized for groundwater elevation monitoring only, and will also be evaluated as potential long-term monitoring locations once the long-term groundwater quality monitoring program is developed.

• Twelve recovelY wells are utilized for hydraulic control and/or to remove NAPL.

• Eighty-five monitoring wells (in addition to the wells that are or have been sampled under the GMA 1 groundwater quality monitoring program) are routinely monitored for groundwater elevation data and to assess the presence and extent of LNAPL and/or DNAPL.

Proposed Modifications to Existing Well Network Within East Street Area 2-South

In evaluating the future status of each well in East Street Area 2-South, GE considered: 1) the current usage of the well (e.g., groundwaterlNAPL monitoring, NAPL recovelY, etc.); 2) the response actions (i.e., soil removal/replacement, pavement enhancement, any/or barrier installation) to be conducted in the vicinity of the well; 3) the potential for the well to interfere with or be damaged during the performance of response actions; and 4) the existence of nearby wells to provide adequate monitoring. GE also reviewed the extent of NAPL within this portion of GMA 1 (depicted on Figure 2) to ensure that sufficient monitoring locations would remain (both within and down-gradient of known NAPL areas) following any proposed well decommissioning activities. Based on these considerations, GE proposes the following approach for the disposition of the monitoring wells within East Street Area 2-South:

• Existing wells that al'e located within or near an area subject to soil-related response actions that are not included in any groundwater quality or NAPL monitoring program are proposed to be removed and not replaced.

• Wells that are included in GE's ongoing groundwater quality or NAPL monitoring program and that are located within a paved area to be addressed by soil-related response actions are generally proposed to be removed and replaced following performance of the Removal Action, since the

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Mr. Richard Fisher October 30,2009

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removal of pavement during the course of the Response Action would likely result in the destruction of the well.

• Wells that are included in GE's ongoing groundwater quality or NAPL monitOling program and that are located within an unpaved area to be addressed by soil-related response actions are generally proposed to be protected during performance of the response action, since it is anticipated that the relatively shallow soil removals can be conducted without damaging the monitoring wells. If a well is damaged, it will be repaired or replaced following performance of the response action, if necessary. Wells that are included in GE's groundwater quality or NAPL monitoring program and located in areas subject to deeper soil removals or other areas that could interfere with the response action are proposed to be removed and replaced following performance of the response action. Celiain wells may be modified (e.g., converted from above-grade stickup to flushmount surface completion) or have protective covers replaced, if necessary.

• Select wells that are not currently being monitored or are being monitored but where there are other nearby wells providing adequate information are proposed to be removed.

Table 2 contains a listing of the monitoring wells identified in Table 1 as being within or near portions of East Street Area 2-South subject to soil-related response actions and presents GE's proposed approach for each well. A summary of the wells within each Averaging Area within East Street Area 2-South and their proposed disposition during and after performance of the East Street Area 2-South response action is presented below.

Averaging Area 4A:

There are three monitOling wells located within Averaging Area 4A. One well (95-25) is utilized in GE's groundwater quality monitoring program and one well (16R) is utilized as a groundwater elevation/NAPL monitoring point in GE's NAPL monitoring program. The remaining well (17R) is not currently utilized by GE and is located within an area subject to future pavement enhancement/maintenance activities. Accordingly, GE proposes to decommission well 17R without installing a replacement well.

Averaging Area 4B:

There are 65 wells and five recovery wells/caissons located within Averaging Area 4B. Three of these wells are included in GE's groundwater quality monitoring program and 44 other wells are utilized as groundwater elevationlNAPL monitoring points in GE's NAPL monitoring program. The remaining 18 wells are not currently utilized by GE. Eighteen currently-utilized locations, including 16 groundwater elevationlNAPL monitoring points, are located within or near soil removal/vegetative engineered batTier areas, as indicated in Table 1 and illustrated on Figure 1. Nine other wells, of which eight are groundwater elevationlNAPL monitoring points, are located in areas subject to pavement enhancement.

As indicated in Table 2, GE proposes the following:

• Decommissioning of wells 8 and 95-19: These two wells are located within an area subject to future soil removal/replacement or pavement enhancement and are not currently included in either the groundwater quality or NAPL monitoring program.

• Decommissioning of well 6: This well is currently utilized in GE's groundwater elevationINAPL monitoring program and located within a one-foot soil removal area. Well 6 is in the vicinity of several wells that are either within areas subject to soil removal activities or will be protected during these activities, therefore GE proposes to decommission and not replace this well.

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• Decommissioning of caisson 64S2: This inactive caisson is located within an area subject to soil removal. However, a groundwaterlNAPL recovery system is not in use at this location, nor is LNAPL present. Additionally, the well is no longer utilized in GE's NAPL monitoring program. Therefore, GE proposes that it be removed and not re-installed.

• Replacement of well 9S-4R: GE proposes to decommission this well, which is utilized in GE's groundwater elevationlNAPL monitoring program and located within a six-foot soil removal area. A replacement well will be installed following performance of the soil removal and restoration activities.

• The remaining wells within or near areas subject to soil-related response actions will be protected during the performance of those activities (see Table 2). Several wells may require height modification andlor replacement of protective covers as part of the site restoration.

In addition to the wells listed above that will be impacted by the soil-related response actions, GE also proposes to decommission fourteen monitoring wells, thirteen of which are not utilized in its ongoing groundwater quality and NAPL monitoring programs. The specifications of these fourteen wells (i.e., wells 3, llR, 22, 31, 39, E2SC-OS, E2SC-06, E2SC-14, E2SC-2S, PI, P2, P3D, PS, and P7) are listed in Table 3 and their locations are provided on Figure 3 (along with all other wells proposed to be removed in East Street Area 2-South). These wells, which are either located near similar monitoring wells or not optimally screened for their intended monitoring purposes, will not likely be included in any future monitoring efforts.

Averaging AI"ea 4C:

No monitoring wells are utilized by GE within this averaging area, which has already been addressed by GE. Therefore, no groundwater-related modifications in this area are proposed.

Averaging Area 4D:

A total of 40 monitoring wells and seven groundwaterlNAPL recovery wells are located within Averaging Area 4D. Four of these wells are included in GE's groundwater quality monitoring program and 18 wells are utilized as groundwater elevationINAPL monitoring points in GE's NAPL monitoring program. The remaining 18 wells are not currently utilized by GE. Only one well (ES2-12) is located within a soil removal area and two additional wells (E2SC-04 and 64/ESA2S-64) are located near a removal area, as indicated in Table I and illustrated on Figure I.

Since wells E2SC-04 and ES2-12 are not utilized in any ongoing groundwater quality or groundwater elevationlNAPL monitoring program, GE proposes that they be removed and not replaced. GE will protect well 64/ESA2S-64 during the performance of the nearby soil removal activities.

Similar to Averaging Area 4B above, GE also proposes to decommission l3 monitoring wells that will not be impacted by the soil-related response actions but are not utilized in its ongoing groundwater quality and NAPL monitoring programs. The specifications of these wells (i.e., wells S6, 63, 9S-6, E2SC-02, E2SC-03S, E2SC-09, E2SC-16I, E2SC-16S, PZ-ID, PZ-3D, PZ-3S, PZ-7S, and RB-I) are also listed in Table 3 and their locations are provided on Figure 3. These wells are either located near similar monitoring wells or not optimally screened for their intended monitoring purposes, will not likely be included in any future monitoring efforts. In addition, GE proposes to decommission well ES2-6 and install a replacement well, since the entire screen section of this DNAPL monitoring point has become silted in and prior attempts to remove the sediment have been unsuccessful. Installation of this replacement well will eliminate the need for nearby deep monitoring well ES2-1 (which is intended to

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monitor for DNAPL but is not optimally screened at the confining layer) and GE proposes that this well be decommissioned and removed from the GMA 1 monitoring program.

Averaging Area 4E:

A total of 44 monitoring wells are located within this averaging area. Five of these wells are included in GE's groundwater quality monitoring program and 22 wells are utilized as a groundwater elevationlNAPL monitoring point in GE's NAPL monitoring program. The remaining 17 wells are not currently utilized by GE. Almost all of these wells (42 of the 44 wells), including all five groundwater quality monitoring wells and 20 groundwater elevationlNAPL monitoring points, are located in or within close proximity to the proposed soil removal/building demolition/vegetative engineered barrier areas, as indicated in Table 1 and illustrated on Figure 1.

For the five groundwater quality wells located in or within close proximity to soil removal/vegetative engineered barrier areas, GE proposes that two of those locations (HR-G I-MW3 and HR-G3-MWI) be protected if possible, since they are near, but not in, an excavation zone within an unpaved area. Another well, 3-6C-EB-29, is within a one-foot excavation zone within an unpaved area but will also be protected if possible. The other two wells (3-6C-EB-I4 and ES2-2A) are proposed to be abandoned and re-installed post excavation. As approved by EPA in its September 8, 2009 conditional approval letter relating to GE's June 19,2009 Proposed Modifications to Monitoring Well Network, the replacement for weIl3-6CEB-I4 will be installed with a screened section between the depths of 6 and 16 feet below grade, which is approximately centered around the average groundwater elevations of the original well (11.5 feet below grade). To ensure that the well will be appropriately screened to monitor for the presence of LNAPL during all occasions, the top of the replacement well screen will be at an elevation above the historical high groundwater elevations recorded at this location (i.e., approximately 9 feet below grade). Well ES2-2A is proposed to be replaced based on maintenance needs identified during recent well inspections and the likelihood that the well would be fUlther damaged during the removal of adjacent wells ES2-2 and ES2-7 (see below).

For the 20 groundwater elevationINAPL monitoring wells in or within close proximity to the proposed soil removal/vegetative engineered barrier areas, GE proposes that 11 of these wells located within unpaved areas near but not in the excavation zone or in or within close proximity to the vegetative engineered barrier area be protected and that the other six wells that are located in paved areas be removed and replaced following performance of the response action. If a well proposed to be protected is damaged during excavation activities, or determined to be in a portion of the work area that cannot be adequately protected, it will also be removed and replaced following performance of the response action. When possible, replacement wells will be installed at locations outside of the vegetative engineered barrier (i.e., replacements for wells E2SC-2I and GMA 1-23 are proposed to be installed slightly north of the existing well locations along the northern border of the proposed vegetative engineered barrier) to limit the number of barrier penetrations.

It should be noted that as with the replacement for monitoring well 3-6C-EB-14 discussed above, EPA has already approved the specifications of the replacement for well 19. Specifically, GE will install the screened sections of the replacement well at a depth between 6 and 16 feet below grade, which is approximately centered around the average groundwater elevations of well 19 (10.9 feet below grade). The top of the replacement well screen will be at an elevation above the historical high groundwater elevations recorded at this wells (i.e., 8.5 feet below grade at well 19) to ensure that the well will be appropriately screened to monitor for the presence of LNAPL during all seasons.

It is also proposed that for wells to be replaced within areas where a liner will be installed beneath the vegetative engineered barrier that are not replaced prior to placement of the barrier, that an opening be constructed in the liner and sealed to a steel casing that will installed to a depth of approximately three G:IGEIGE]ittsfield_ CD _ GMA_I IReports and PresentationslESA2 Well Proposal\255911222 _ ESA I and2 _ WellDecomLtr.doc


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feet at the future well location and left open following liner installation to facilitate installation of the replacement wells through the casing following completion of the response action activities without penetrating the newly-installed liner.

Finally, GE proposes that the 16 wells listed in Table 2 within soil removal areas in this averaging area that are not included in any ongoing groundwater quality or groundwater elevationlNAPL monitoring program be removed and not replaced.

Overall, GE proposes to initially decommission 61 select wells at East Street Area 2-South prior to the commencement of the soil Removal Actions proposed in the Conceptual Work Plan and Addenda. GE will evaluate further the need to remove other monitoring well locations based on the field survey and discussions with the remediation contractor in order to confirm well locations and their proximity to work areas. Of the 61 monitoring wells that are proposed to be abandoned, 10 wells will be replaced during or following completion of the associated soil restoration activities. GE will decommission each of these monitoring wells in accordance with the general procedures described in Appendix GG of GE's FSP/QAPP for the GE-Pittsfield/Housatonic River Site.

Each of the monitoring wells to remain in place will be protected during the performance of the Removal Action at East Street Area 2-South. Table 3 presents a summaJY of the specifications of the existing monitoring wells proposed to be decommissioned. As indicated in Tables 2 and 3, 44 of the wells proposed to be removed are not currently sampled or monitored under any ongoing programs at GMA 1. None of the wells that were sampled under the baseline groundwater quality monitoring program, including those currently being sampled under the interim groundwater monitoring program for GMA 1, are proposed to be removed and not replaced.

In addition to evaluating the monitoring well network at East Street Area 2-South, GE has reviewed the status of monitoring wells at the other East Street RAAs (i.e., East Street Area I-North, East Street Area I-South, and East Street Area 2-NOlih) within GMA 1 and has identified several wells that are not needed to suppOli GE's ongoing groundwater quality and NAPL monitoring programs. Between these three areas, 18 wells are proposed to be decommissioned, one of which is proposed to be replaced by an upgraded well. GE's proposals to decommission and/or replace those wells, which are listed in Table 4 and illustrated on Figure 4, are discussed below.

East Street Area 1-North:

A total of 18 monitoring wells are located within this averaging area. One of these wells is included in GE's groundwater quality monitoring program and 13 wells are utilized as groundwater elevationlNAPL monitoring points in GE's NAPL monitoring program. The remaining four wells are not currently utilized by GE. GE proposes to decommission five monitoring wells at East Street Area I-NOlih (i.e., wells 6, 49, 52, 127, and 130). Four of these wells aJ'e not currently used by GE and will not be needed in the future due to the presence of other monitoring wells. The fifth well (52) is utilized as a groundwater elevationlNAPL monitoring point as well as a baseline groundwater quality monitoring location. As described in prior GMA 1 monitoring repOlis and discussed with EPA, this well has been found to be damaged by surface infiltration and is no longer usable for groundwater quality monitoring purposes. For safety purposes, installation of a replacement well at the original well 52 location within East Street is not proposed. Instead, GE proposes to install a larger diameter well at the location of East Street Area 1-South well ESI-13 (discussed below), which is to the south of East Street immediately south of well 52 (See Figure 4).

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East Street Area I-South:


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A total of 25 monitoring wells are located within this averaging area. Four of these wells are included in GE's groundwater quality monitoring program and 16 wells are utilized as a groundwater elevationlNAPL monitoring point in GE's NAPL monitoring program. The remaining five wells are not cunently utilized by GE. GE proposes to decommission six monitoring wells at East Street Area I-South (i.e., wells 77, 89, 90, 97, ESI-13, and ESI-24). Four of these wells are not cunently used by GE and, along with well 90 which is monitored for groundwater elevations on a semi-annual basis, are not needed for groundwater elevation contouring purposes. As discussed above, GE proposes to install a replacement for well ESI-13 that will serve as the replacement for nearby East Street Area I-NOlih well 52 as a groundwater elevationINAPL monitoring point and groundwater quality monitoring location. To facilitate potential groundwater sampling needs, GE will decommission small diameter well ES 1-13 (0.75-inch diameter) and install a 2-inch diameter replacement well at that location.

East Street Area 2-North:

A total of 26 monitoring wells are located within this averaging area. Seven of these wells are included in GE's groundwater quality monitoring program and II wells are utilized as a groundwater elevation/NAPL monitoring point in GE's NAPL monitoring program. The remaining eight wells are not cunently utilized by GE. GE proposes to decommission seven monitoring wells at East Street Area 2-NOlih (i.e., wells 6-N, 9-N, 21-N, 22-N, 95-12, ESI-II, and ESI-19). None of these wells are currently used by GE nor will any of them be needed in the future due to the presence of other monitoring wells that are better positioned to monitor groundwater elevations and NAPL extent in this area.

Schedule

Following EPA approval of this proposal, GE will decommission each of the monitoring wells that are not currently being utilized in accordance with the general procedures described in Appendix GG of GE's FSP/QAPP for the GE-Pittsfield/Housatonic River Site. Any remaining monitoring wells at East Street Area 2-South will continue to be used for GMA I monitoring purposes until or shortly prior to the initiation of the Removal Action at East Street Area 2-South, during which time they will be protected, replaced, and/or modified (as necessary).

Please call me if you have any questions regarding this proposal.

Remediation Project Manager

Attachments

G:IGEIGE]ittsfield_CD _ GMA_llReports and PresentationslESA2 Well ProposaI1255911222_ESA land2_ WellDecomLtrdoc

cc: D. Tagliaferro, EPA T. Conway, EPA (cover letter only) H. Inglis, EPA (CD-ROM) R. Howell, EPA (CD-ROM) K.C. Mitkevicius, USACE (CD-ROM) L. Palmieri, Weston (2 hard copies and CD-ROM) E. Tor, MDEP (cover letter only) 1. Rothchild, MDEP (cover letter only) M. Gorski, MDEP (cover letter only) 1. Ziegler, MDEP (2 copies) S. Steenstrup, MDEP (cover letter only) 1. Ruberto, Mayor, City of Pittsfield Pittsfield Commissioner of Public Health W. Hines, Director, PEDA B. Landau, Noble & Wickersham T. Bowers, Gradient N. E. Harper, MA AG D. Young, MA EOEA


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M. Carroll, GE (cover letter only) R. McLaren, GE (cover letter only) 1. Nuss, ARCADIS 1. Bieke, Goodwin Procter 1. Ciampa, SPECTRA 1. POlier, Mintz, Levin R. Nasman, Berkshire Gas M. Booher, Dewey & LeBoeuf (cover letter only) 1. Murarka, Ish, Inc. K. Hylton, KHES, LLC (cover letter only) D. Mauro, META (cover letter only) Public Information Repositories GE Internal Repositories

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Tables

Table 1Summary Of East Street Area 2-South Monitoring Wells

General Electric Company - Pittsfield, Massachusetts

Well ID Current Monitoring Well Usage Proposed RD/RA Activities At/Near Well Location

AVERAGING AREA 4A16R Groundwater Elevation/NAPL Monitoring Approximately 10 feet North of Degraded Pavement to be Re-paved 17R None Area of Degraded Pavement to be Re-paved

95-25 Groundwater Quality Sampling (Baseline) None

AVERAGING AREA 4B

1R Groundwater Elevation/NAPL Monitoring Approximately 25 feet North of Soil Removal to 1 Foot2 Groundwater Elevation/NAPL Monitoring None3 None None5 Groundwater Elevation/NAPL Monitoring Approximately 60 feet East of Soil Removal to 1 Foot6 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot8 None Soil Removal to 1 Foot/Pavement Enhancement

9R Groundwater Elevation/NAPL Monitoring Approximately 40 feet East of Soil Removal to 1 Foot10 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot

11R None Approximately 10 feet West of Soil Removal to 1 Foot13 Groundwater Elevation/NAPL Monitoring None14 Groundwater Elevation/NAPL Monitoring Area of Degraded Pavement to be Re-paved 22 None None

25R Groundwater Elevation/NAPL Monitoring None26RR Groundwater Elevation/NAPL Monitoring None

28 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot29 Groundwater Elevation/NAPL Monitoring Approximately 40 feet South of Soil Removal to 1 Foot30 Groundwater Elevation/NAPL Monitoring None31 Groundwater Elevation/NAPL Monitoring None32 Groundwater Elevation/NAPL Monitoring None34 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot35 Groundwater Elevation/NAPL Monitoring Approximately 10 feet South West of Soil Removal to 1 Foot36 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot37 Groundwater Elevation/NAPL Monitoring None38 Groundwater Elevation/NAPL Monitoring None39 None None40 Groundwater Elevation/NAPL Monitoring None47 Groundwater Elevation/NAPL Monitoring None50 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot51 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot52 Groundwater Quality Sampling (Baseline) None57 Groundwater Elevation/NAPL Monitoring None

64R Groundwater/NAPL Recovery Soil Removal to 1 Foot64S Groundwater/NAPL Recovery Soil Removal to 1 Foot64S2 None Soil Removal to 1 Foot

65 None None95-4R Groundwater Elevation/NAPL Monitoring Soil Removal to 6 Feet/Pavement Enhancement95-5 Groundwater Elevation/NAPL Monitoring Pavement Enhancement

95-7R Groundwater Elevation/NAPL Monitoring 1 Foot Soil Removal95-19 None Area of Degraded Pavement to be Re-paved

E2SC-05 None NoneE2SC-06 None NoneE2SC-14 None NoneE2SC-22 None Approximately 20 feet South of Soil Removal to 1 FootE2SC-25 None None

ES2-5 Groundwater Quality Sampling (Baseline) Approximately 40 feet North of Pavement EnhancementES2-10 Groundwater Elevation/NAPL Monitoring NoneES2-11 Groundwater Elevation/NAPL Monitoring Pavement EnhancementES2-14 Groundwater Elevation/NAPL Monitoring Approximately 40 feet West of Pavement Enhancement

Groundwater Management Area 1 - East Street Area 2-South

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AVERAGING AREA 4B (Continued)

ES2-15R Groundwater Elevation/NAPL Monitoring Pavement EnhancementES2-16 Groundwater Elevation/NAPL Monitoring None

ES2-17R Groundwater Elevation/NAPL Monitoring Pavement EnhancementES2-18 Groundwater Elevation/NAPL Monitoring None

GMA1-13 Groundwater Quality Sampling (Interim) NoneGMA1-14 Groundwater Elevation/NAPL Monitoring NoneGMA1-15 Groundwater Elevation/NAPL Monitoring Area of Degraded Pavement to be Re-paved GMA1-16 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 Foot

GMA1-17E Groundwater Elevation/NAPL Monitoring NoneGMA1-17W Groundwater/NAPL Recovery NoneGMA1-19 Groundwater Elevation/NAPL Monitoring Approximately 10 feet North of Vegetative Engineered BarrierGMA1-22 Groundwater Elevation/NAPL Monitoring Approximately 10 feet South of Pavement Enhancement

M-R Groundwater Elevation/NAPL Monitoring NoneP1 None NoneP2 None NoneP3 Groundwater Elevation/NAPL Monitoring None

P3D None NoneP5 None NoneP7 None None

RW-1(S) Groundwater/NAPL Recovery NoneRW-4 Groundwater/NAPL Recovery NoneTMP-1 Groundwater Elevation/NAPL Monitoring None

AVERAGING AREA 4D

42 Groundwater Elevation/NAPL Monitoring None43 Groundwater Elevation/NAPL Monitoring None44 Groundwater Elevation/NAPL Monitoring None48 Groundwater Elevation/NAPL Monitoring None

49R Groundwater Elevation/NAPL Monitoring None49RR Groundwater Elevation/NAPL Monitoring None

53 Groundwater Elevation/NAPL Monitoring None54 Groundwater Elevation/NAPL Monitoring None55 Groundwater Elevation/NAPL Monitoring None56 None None58 Groundwater Elevation/NAPL Monitoring None59 Groundwater Elevation/NAPL Monitoring None63 None None

64/ESA2S-64 Groundwater Quality Sampling (Interim) Approximately 45 feet East of Soil Removal to 1 Foot64V Groundwater/NAPL Recovery None

64X(N) Groundwater/NAPL Recovery None64X(S) Groundwater/NAPL Recovery None64X(W) Groundwater/NAPL Recovery None

95-6 None NoneE2SC-01 None NoneE2SC-02 None NoneE2SC-03I Groundwater Elevation/NAPL Monitoring NoneE2SC-03S None NoneE2SC-04 None Approximately 55 feet South West of Soil Removal to 1 FootE2SC-09 None NoneE2SC-13 None NoneE2SC-16I None NoneE2SC-16S None NoneE2SC-17 Groundwater Elevation/NAPL Monitoring None






AVERAGING AREA 4D (Continued)

E2SC-23 Groundwater Quality Sampling (Interim) NoneE2SC-24 Groundwater Quality Sampling (Interim) NoneES2-1 Groundwater Elevation/NAPL Monitoring NoneES2-6 Groundwater Elevation/NAPL Monitoring NoneES2-8 Groundwater Quality Sampling (Baseline) NoneES2-12 None Soil Removal to 1 Foot

HR-C-RW-1 Groundwater Elevation/NAPL Monitoring NoneP6 None None

PZ-1D None NonePZ-1S Groundwater Elevation/NAPL Monitoring NonePZ-3D None NonePZ-3S None NonePZ-6S Groundwater Elevation/NAPL Monitoring NonePZ-7S None NoneRB-1 None None

RW-1(X) Groundwater/NAPL Recovery NoneRW-2(X) Groundwater/NAPL Recovery NoneRW-3(X) Groundwater/NAPL Recovery None

AVERAGING AREA 4E

3-6C-EB-13 None Vegetative Engineered Barrier3-6C-EB-14 Groundwater Quality Sampling (Interim) Vegetative Engineered Barrier3-6C-EB-22 Groundwater Elevation/NAPL Monitoring Vegetative Engineered Barrier3-6C-EB-23 None Approximately 5 feet South of Vegetative Engineered Barrier3-6C-EB-24 None Soil Removal to 1 Foot3-6C-EB-25 Groundwater Elevation/NAPL Monitoring Approximately 5 feet South of Soil Removal to 1 Foot3-6C-EB-26 None Soil Removal to 1 Foot3-6C-EB-27 None Vegetative Engineered Barrier3-6C-EB-28 Groundwater Elevation/NAPL Monitoring Approximately 5 feet South of Soil Removal to 1 Foot3-6C-EB-29 Groundwater Quality Sampling (Baseline) Soil Removal to 1 Foot3-6C-EB-30 None Building Demolition/ Soil Removal to 1 Foot3-6C-EB-31 None Building Demolition/ Soil Removal to 1 Foot

18 None Vegetative Engineered Barrier19 Groundwater Elevation/NAPL Monitoring Vegetative Engineered Barrier21 None Vegetative Engineered Barrier62 None Vegetative Engineered Barrier

95-1 Groundwater Elevation/NAPL Monitoring Vegetative Engineered Barrier95-2 None Vegetative Engineered BarrierC-60 None Vegetative Engineered Barrier

E2SC-21 Groundwater Elevation/NAPL Monitoring Vegetative Engineered BarrierES2-2 None Vegetative Engineered Barrier

ES2-2A Groundwater Quality Sampling (Interim) Vegetative Engineered BarrierES2-3 None Vegetative Engineered BarrierES2-4 None Vegetative Engineered BarrierES2-7 None Vegetative Engineered Barrier

GMA1-20 Groundwater Elevation/NAPL Monitoring Vegetative Engineered BarrierGMA1-21 Groundwater Elevation/NAPL Monitoring Vegetative Engineered BarrierGMA1-23 Groundwater Elevation/NAPL Monitoring Vegetative Engineered BarrierGMA1-24 Groundwater Elevation/NAPL Monitoring Vegetative Engineered Barrier

HR-G1-MW1 Groundwater Elevation/NAPL Monitoring Vegetative Engineered BarrierHR-G1-MW2 Groundwater Elevation/NAPL Monitoring Vegetative Engineered BarrierHR-G1-MW3 Groundwater Quality Sampling (Baseline) Approximately 5 feet South of Vegetative Engineered Barrier






AVERAGING AREA 4E (Continued)

HR-G2-MW1 Groundwater Elevation/NAPL Monitoring Approximately 5 feet South of Vegetative Engineered BarrierHR-G2-MW2 Groundwater Elevation/NAPL Monitoring Approximately 5 feet South of Vegetative Engineered BarrierHR-G2-MW3 Groundwater Elevation/NAPL Monitoring Approximately 5 feet South of Vegetative Engineered BarrierHR-G2-RW1 Groundwater Elevation/NAPL Monitoring Approximately 10 feet South of Vegetative Engineered BarrierHR-G3-MW1 Groundwater Quality Sampling (Interim) Approximately 5 feet South of Vegetative Engineered BarrierHR-G3-MW2 Groundwater Elevation/NAPL Monitoring Approximately 5 feet South of Vegetative Engineered BarrierHR-G3-RW1 Groundwater Elevation/NAPL Monitoring NoneHR-J1-MW-1 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 FootHR-J1-MW-2 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 FootHR-J1-MW-3 Groundwater Elevation/NAPL Monitoring Soil Removal to 1 FootHR-J1-RW-1 Groundwater Elevation/NAPL Monitoring None

RF-1 None Building Demolition/ Soil Removal to 1 Foot


Table 2East Street Area 2-South Monitoring Wells Potentially Impacted by Soil-Related Response Actions


Well ID Proposed RD/RA Activities At/Near Well Location

Paved/ Unpaved Area Proposed Well Disposition

16R Approximately 10 feet North of Degraded Pavement to be Re-paved Paved Protect Well

17R Area of Degraded Pavement to be Re-paved Paved Remove Well/ Do not Replace

AVERAGING AREA 4B

1R Approximately 25 feet North of Soil Removal to 1 Foot Unpaved Protect Well From Damage

5 Approximately 60 feet East of Soil Removal to 1 Foot Unpaved Protect Well From Damage

6 Soil Removal to 1 Foot Unpaved Remove Well/ Do not Replace

8 Soil Removal to 1 Foot/Pavement Enhancement Unpaved (gravel) Remove Well/ Do not Replace

9R Approximately 40 feet East of Soil Removal to 1 Foot Unpaved Protect Well From Damage

10 Soil Removal to 1 Foot Unpaved (gravel) Protect/ Add New Protective Casing/Cover

11R Approximately 10 feet West of Soil Removal to 1 Foot Unpaved Remove Well/ Do not Replace

14 Area of Degraded Pavement to be Re-paved Paved Protect/ Add New Protective Casing/Cover

28 Soil Removal to 1 Foot Unpaved Protect/ Add New Protective Casing/Cover

29 Approximately 40 feet South of Soil Removal to 1 Foot Unpaved Protect Well From Damage


35 Approximately 10 feet South West of Soil Removal to 1 Foot Unpaved Protect Well




64R Soil Removal to 1 Foot Unpaved Protect Well From Damage

64S Soil Removal to 1 Foot Unpaved Protect Well From Damage

64S2 Soil Removal to 1 Foot Unpaved Remove Well/ Do not Replace

95-4R Soil Removal to 6 Feet/Pavement Enhancement Paved Remove Well/ Replace

95-5 Pavement Enhancement Paved Protect Well

95-7R 1 Foot Soil Removal Unpaved Protect Well

95-19 Area of Degraded Pavement to be Re-paved Paved Remove Well/ Do not Replace

E2SC-22 Approximately 20 feet South of Soil Removal to 1 Foot Unpaved Protect Well From Damage

ES2-5 Approximately 40 feet North of Pavement Enhancement Paved Protect/ Add New Protective Casing/Cover

ES2-11 Pavement Enhancement Paved Protect/ Add New Protective Casing/Cover

ES2-14 Approximately 40 feet West of Pavement Enhancement Paved Protect Well

ES2-15R Pavement Enhancement Paved Protect/ Add New Protective Casing/Cover

ES2-17R Pavement Enhancement Paved Protect/ Add New Protective Casing/Cover

GMA1-15 Area of Degraded Pavement to be Re-paved Paved Protect Well

GMA1-16 Soil Removal to 1 Foot Unpaved Protect Well

GMA1-19 Approximately 10 feet North of Vegetative Engineered Barrier Paved Protect Well

GMA1-22 Approximately 10 feet South of Pavement Enhancement Paved Protect Well

RW-4 Pavement Enhancement Paved Protect/ Add New Protective Casing/Cover


AVERAGING AREA 4A







AVERAGING AREA 4D

ESA2S-64 Approximately 45 feet East of Soil Removal to 1 Foot Unpaved Protect Well E2SC-04 Approximately 50-55 feet South West of Soil Removal to 1 Foot Unpaved Remove Well/ Do not Replace

ES2-12 Soil Removal to 1 Foot Unpaved Remove Well/ Do not Replace

AVERAGING AREA 4E

3-6C-EB-13 Vegetative Engineered Barrier Paved Remove Well/ Do not Replace

3-6C-EB-14 Vegetative Engineered Barrier Paved Remove Well/ Replace With Shallower Well

3-6C-EB-22 Vegetative Engineered Barrier Unpaved Protect/ Add New Protective Casing/Cover

3-6C-EB-23 Approximately 5 feet South of Vegetative Engineered Barrier Unpaved Remove Well/ Do not Replace

3-6C-EB-24 Soil Removal to 1 Foot Unpaved Remove Well/ Do not Replace

3-6C-EB-25 Approximately 5 feet South of Soil Removal to 1 Foot Unpaved Protect Well; If Necessary Remove/ Replace Well

3-6C-EB-26 Soil Removal to 1 Foot Unpaved Protect Well; If Necessary Remove/ Replace Well

3-6C-EB-27 Vegetative Engineered Barrier Unpaved Remove Well/ Do not Replace

3-6C-EB-28 Approximately 5 feet South of 1' Removal Unpaved Protect Well; If Necessary Remove/ Replace Well

3-6C-EB-29 Soil Removal to 1 Foot Unpaved Protect Well; If Necessary Remove/ Replace Well

3-6C-EB-30 Building Demolition/ Soil Removal to 1 Foot Paved Remove Well/ Do not Replace

3-6C-EB-31 Building Demolition/ Soil Removal to 1 Foot Paved Remove Well/ Do not Replace

18 Vegetative Engineered Barrier Paved Remove Well/ Do not Replace

19 Vegetative Engineered Barrier Paved Remove Well/ Replace With Shallower Well

21 Vegetative Engineered Barrier Paved Remove Well/ Do not Replace

62 Vegetative Engineered Barrier Unpaved Remove Well/ Do not Replace

95-1 Vegetative Engineered Barrier Paved Remove Well/ Replace

95-2 Vegetative Engineered Barrier Unpaved Remove Well/ Do not Replace

C-60 Vegetative Engineered Barrier Unpaved Remove Well/ Do not Replace

E2SC-21 Vegetative Engineered Barrier Paved Remove Well/ Replace Outside of Barrier Area

ES2-2 Vegetative Engineered Barrier Unpaved Remove Well/ Do not Replace

ES2-2A Vegetative Engineered Barrier Unpaved Remove Well/ Replace

ES2-3 Vegetative Engineered Barrier Paved Remove Well/ Do not Replace



GMA1-20 Vegetative Engineered Barrier Paved Remove Well/ Replace

GMA1-21 Vegetative Engineered Barrier Unpaved Protect Well; If Necessary Remove/ Replace Well

GMA1-23 Vegetative Engineered Barrier Paved Remove Well/Replace Outside of Barrier

GMA1-24 Vegetative Engineered Barrier Paved Remove Well/ Replace

HR-G1-MW1 Vegetative Engineered Barrier Unpaved Protect Well; If Necessary Remove/ Replace Well

HR-G1-MW2 Vegetative Engineered Barrier Unpaved Protect/ Add New Protective Casing/Cover

HR-G1-MW3 Approximately 5 feet South of Vegetative Engineered Barrier Unpaved Protect/ Add New Protective Casing/Cover







AVERAGING AREA 4E (Continued)



HR-G2-MW3 Approximately 5 feet South of Vegetative Engineered Barrier Unpaved Protect Well; If Necessary Remove/ Replace Well

HR-G2-RW1 Approximately 10 feet South of Vegetative Engineered Barrier Unpaved Protect Well; If Necessary Remove/ Replace Well



HR-J1-MW-1 Soil Removal to 1 Foot Unpaved Protect Well; If Necessary Remove/ Replace Well



RF-1 Building Demolition/ Soil Removal to 1 Foot Paved Remove Well/ Do not Replace


Table 3Specifications of Existing Monitoring Wells Proposed To Be Removed and/or Replaced

Groundwater Management Area 1 - East Street Area 2-SouthGeneral Electric Company - Pittsfield, Massachusetts

Well ID Well Diameter (Inches) Northing Easting

Ground Surface Elevation

(Feet AMSL)

Measuring Point Elevation

(Feet AMSL)

Depth To Top of Screen

(Ft BGS)

Depth to Bottom of Screen

(Ft BGS)Proposed Well Disposition

AVERAGING AREA 4A17R 2.00 533299.1000 131689.6700 985.00 984.89 6.60 21.60 Remove Well/ Do not Replace

AVERAGING AREA 4B

3 2.00 NA NA 982.66 993.96 15.00 25.00 Remove Well/ Do not Replace6 2.00 533799.1800 132650.3400 991.40 991.18 15.00 25.00 Remove Well/ Do not Replace8 NA 533602.5000 132525.0500 985.40 985.35 10.00 20.00 Remove Well/ Do not Replace

11R 2.00 533485.0600 132252.5100 989.20 988.86 5.00 25.00 Remove Well/ Do not Replace22 2.00 NA NA 994.85 994.69 17.00 10.00 Remove Well/ Do not Replace31 2.00 533651.5000 133032.3300 990.96 990.81 9.00 19.00 Rtemove Well/Do not Replace39 2.00 NA NA 984.30 983.89 5.00 10.00 Remove Well/ Do not Replace

64S2 NA 533483.2100 132634.6000 NA NA NA NA Remove Well/ Do not Replace95-4R 4.00 533543.5000 132537.6000 985.80 988.36 10.00 20.00 Remove Well/ Replace95-19 0.75 533307.1000 131940.8900 989.91 989.91 11.40 21.40 Remove Well/ Do not Replace

E2SC-05 2.00 533766.6700 133382.0000 991.42 993.24 30.00 10.00 Remove Well/ Do not ReplaceE2SC-06 2.00 533694.7400 133304.4300 990.46 992.49 8.70 10.00 Remove Well/ Do not ReplaceE2SC-14 2.00 533793.6900 133536.4800 990.19 992.25 9.99 19.99 Remove Well/ Do not ReplaceE2SC-25 2.00 533951.4000 133130.1600 994.81 997.06 28.00 10.00 Remove Well/ Do not Replace

P1 2.00 NA NA 989.25 988.75 3.80 10.00 Remove Well/ Do not ReplaceP2 2.00 533634.6000 133233.1800 988.50 988.22 4.00 10.00 Remove Well/ Do not Replace

P3D 2.00 533662.2400 133183.1000 988.55 988.54 12.75 14.75 Remove Well/ Do not ReplaceP5 2.00 NA NA 985.77 985.64 1.50 11.50 Remove Well/ Do not ReplaceP7 2.00 533596.9400 133115.9600 985.30 989.10 0.50 10.00 Remove Well/ Do not Replace

AVERAGING AREA 4D

56 2.00 533643.8000 133329.0400 987.34 987.28 7.00 20.00 Remove Well/ Do not Replace63 2.00 533407.2900 133207.1500 986.70 986.48 13.00 15.00 Remove Well/ Do not Replace

95-6 0.75 533424.3900 133236.2100 986.14 989.07 20.00 10.00 Remove Well/ Do not ReplaceE2SC-02 2.00 533574.7700 133343.7100 985.93 987.57 31.00 10.00 Remove Well/ Do not Replace

E2SC-03S 2.00 533473.4300 133394.8800 980.57 982.15 10.00 10.00 Remove Well/ Do not ReplaceE2SC-04 2.00 533577.7600 133578.9700 983.53 989.11 34.00 10.00 Remove Well/ Do not ReplaceE2SC-09 2.00 533432.5000 133294.7900 983.48 984.78 30.00 10.00 Remove Well/ Do not ReplaceE2SC-16I 2.00 533539.6800 133513.9000 985.78 987.77 38.50 10.00 Remove Well/ Do not ReplaceE2SC-16S 2.00 533542.8800 133523.7000 985.78 987.69 7.00 10.00 Remove Well/ Do not Replace

ES2-1 4.00 533454.4200 133267.9700 985.70 985.36 25.00 10.00 Remove Well/ Do not ReplaceES2-6 4.00 533465.7700 133277.9200 986.30 986.00 37.50 10.00 Remove Well/Replace

ES2-12 2.00 533269.3400 132750.6600 985.10 984.41 4.50 19.50 Remove Well/ Do not ReplacePZ-1D 1.50 NA NA NA NA 17.84 5.58 Remove Well/ Do not ReplacePZ-3D 1.50 NA NA NA NA 13.77 5.58 Remove Well/ Do not ReplacePZ-3S 1.50 NA NA NA NA 9.22 5.58 Remove Well/ Do not ReplacePZ-7S 2.00 NA NA NA NA 7.34 5.50 Remove Well/ Do not ReplaceRB-1 4.00 533453.7100 133305.7200 NA 985.18 8.00 15.00 Remove Well/ Do not Replace


Table 3Specifications of Existing Monitoring Wells Proposed To Be Removed and/or Replaced

Groundwater Management Area 1 - East Street Area 2-SouthGeneral Electric Company - Pittsfield, Massachusetts

Well ID Well Diameter (Inches) Northing Easting


(Feet AMSL)


(Feet AMSL)


(Ft BGS)



AVERAGING AREA 4E

3-6C-EB-13 1.00 NA NA 984.64 984.36 28.25 37.75 Remove Well/ Do not Replace3-6C-EB-14 2.00 532899.2500 132124.9800 984.68 984.20 12.00 21.50 Remove / Replace With Well Screened 6- to 16-feet BGS3-6C-EB-23 2.00 532209.7700 131869.3500 983.25 986.29 6.70 16.50 Remove Well/ Do not Replace3-6C-EB-24 2.00 532896.6970 131815.3220 983.16 985.84 6.80 16.60 Remove Well/ Do not Replace3-6C-EB-27 2.00 532901.3960 131994.2650 982.41 985.03 9.00 18.50 Remove Well/ Do not Replace3-6C-EB-30 2.00 NA NA 984.40 983.80 8.20 22.70 Remove Well/ Do not Replace3-6C-EB-31 2.00 532924.7000 131745.2000 984.40 984.15 46.30 55.80 Remove Well/ Do not Replace

18 2.00 NA NA 983.30 983.33 12.00 27.00 Remove Well/ Do not Replace19 2.00 532948.3000 132198.0000 984.10 983.59 10.00 25.00 Remove / Replace With Well Screened 6- to 16-feet BGS21 2.00 NA NA 984.20 983.82 10.00 20.00 Remove Well/ Do not Replace62 2.00 532980.1700 132526.7200 979.40 979.11 3.00 20.00 Remove Well/ Do not Replace

95-1 0.75 532972.0200 131952.9700 983.89 983.77 8.00 18.00 Remove Well/ Replace95-2 2.00 533264.1100 132662.2700 982.51 985.53 5.50 3.02 Remove Well/ Do not ReplaceC-60 84.00 533015.6100 132543.6500 979.60 979.62 NA NA Remove Well/ Do not Replace

E2SC-21 2.00 533227.1867 132595.2010 982.29 981.70 5.00 15.00 Remove Well/ ReplaceES2-2 4.00 NA NA 980.90 980.12 20.00 30.00 Remove Well/ Do not Replace

ES2-2A 2.00 533023.6000 132497.9000 980.19 979.63 3.00 18.00 Remove Well/ ReplaceES2-3 4.00 NA NA 984.70 984.44 18.00 28.00 Remove Well/ Do not ReplaceES2-4 4.00 532898.8100 132064.1200 984.30 983.84 7.00 22.00 Remove Well/ Do not ReplaceES2-7 4.00 533019.4900 132511.0800 980.40 980.03 33.00 43.00 Remove Well/ Do not Replace

GMA1-20 2.00 533023.2000 132361.6000 983.76 983.49 7.78 17.78 Remove Well/ ReplaceGMA1-23 2.00 533094.4000 132083.4000 986.44 986.16 7.00 17.00 Remove Well/ ReplaceGMA1-24 2.00 533009.4000 132194.8000 984.19 983.81 6.00 16.00 Remove Well/ Replace

RF-1 4.00 532890.8300 131687.3500 984.79 984.42 4.00 19.00 Remove Well/ Do not Replace

Notes:1. Feet AMSL - feet Above Mean Sea Level

2. Feet BGS - feet Below Ground Surface

3.

4.

NA indicates information not available.

The replacements for wells E2SC-21 and GMA1-23 will be installed outside the northern edge of the vegetative engineered barrier.


Table 4Monitoring Wells Proposed To Be Removed and/or Replaced

Groundwater Management Area 1 - East Street Area 1-North, East Street Area 1-South, and East Street Area 2-NorthGeneral Electric Company - Pittsfield, Massachusetts

Well ID Current Monitoring Well Usage Well Diameter (Inches) Northing Easting


(Feet AMSL)


(Feet AMSL)


(Ft BGS)



EAST STREET AREA 1-NORTH

6 None NA 534363.3900 134250.3300 1,003.90 1,003.90 3.5 10 Remove Well/ Do not Replace49 None 2.00 534248.5700 134406.5400 999.90 999.90 2 20 Remove Well/ Do not Replace52 Groundwater Elevation/NAPL Monitoring 2.00 534253.8000 134565.9000 999.73 999.26 2 20 Remove Well/ Do not Replace

127 None 2.00 534255.6100 134421.3100 1,001.10 1,001.13 3 10 Remove Well/ Do not Replace130 None 1.75 534282.1500 134407.8100 1,001.30 1,001.31 3 5 Remove Well/ Do not Replace

EAST STREET AREA 1-SOUTH77 None 2.00 533974.7200 134174.2100 990.30 990.26 6.5 25 Remove Well/ Do not Replace89 None 2.00 534032.2800 134341.8600 993.90 993.89 1 10 Remove Well/ Do not Replace90 Groundwater Elevation/NAPL Monitoring 2.00 NA NA 987.70 987.65 2 13 Remove Well/ Do not Replace97 None 1.00 534104.4200 134296.3100 1,000.40 1,000.43 0 15 Remove Well/ Do not Replace

ES1-13 Groundwater Elevation/NAPL Monitoring 0.75 534209.6800 134576.8000 1,000.03 999.93 4 10 Remove Well/ ReplaceES1-24 None 0.75 533837.4100 134748.8500 990.41 990.61 4 14 Remove Well/ Do not Replace

EAST STREET AREA 2-NORTH

6-N None NA 534367.5300 132925.7700 1,011.20 1,010.83 27 10 Remove Well/ Do not Replace9-N None NA 534431.6000 132374.0800 1,011.20 1,011.01 24 10 Remove Well/ Do not Replace

21-N None NA 534365.4400 132983.7100 1,011.10 1,010.81 30 10 Remove Well/ Do not Replace22-N None NA 534361.5400 132852.7800 1,010.80 1,010.64 30 40 Remove Well/ Do not Replace95-12 None 0.75 534383.1200 132689.2700 1,010.38 1,010.20 30 40 Remove Well/ Do not Replace

ES1-11 None 0.75 534671.6100 134188.6500 1,023.59 1,023.44 5 10 Remove Well/ Do not ReplaceES1-19 None 0.75 NA NA 1,025.82 1,025.82 5 10 Remove Well/ Do not Replace

Notes:1. Feet AMSL - feet Above Mean Sea Level

2. Feet BGS - feet Below Ground Surface

3. NA indicates information not available.

4. The replacement well for ES1-13 will take the place of monitoring well 52.


Figures

Documents

GE - HOUSATONIC RIVER, PROPOSAL TO REMOVE / REPLACE … · 2020-04-28 · Transmitted Via Overnight Courier October 30,2009 Mr. Richard Fisher U.S. Environmental Protection Agency