## 2008 ANNUAL SUMMARY REPORT GROUNDWATER MONITORING PROGRAM Town Garage/Radio Beacon Site

Londonderry, New Hampshire

NHDES Site No. 198509001

Prepared for Town of Londonderry, New Hampshire

Prepared by Sanborn, Head & Associates, Inc.

File 2049.02 December 2008

### December 10, 2008 File No. 2049.02 Sherilyn B. Young, Esq. Rath, Young and Pignatelli, P.A. P.O. Box 1500 Concord, NH 03302-1500 Re: 2008 Annual Summary Report - Groundwater Monitoring Program Town Garage/Radio Beacon Site Londonderry, New Hampshire NHDES Site No. 198509001 Dear Sherry: On behalf of the Town of Londonderry (Town), Sanborn, Head & Associates, Inc. (SHA) has completed the year 2008 groundwater quality monitoring round at the Town Garage/Radio Beacon Site (site). This work has been completed in accordance with the Unilateral Administrative Order (UAO) issued to the Town in September 1996 by the United States Environmental Protection Agency (USEPA); a Statement of Work (SOW) that defines the scope of groundwater quality monitoring to be completed at the site was included in the UAO. Further, the monitoring program has been carried out under the auspices of Groundwater Management Permit (GMP) No. GWP-198509001-L-003 issued to the Town by the New Hampshire Department of Environmental Services (NHDES), effective October 10, 1997 and last revised November 26, 2007.
GROUNDWATER SAMPLING AND ANALYSIS One groundwater sample was collected from monitoring well MW-2R on November 6, 2008. Prior to purging/sampling monitoring well MW-2R, the groundwater level in the well was measured with an electric water level meter. Historical water level data are summarized in Table 1. The groundwater sample from monitoring well MW-2R 1 

### was collected using a portable submersible bladder pump. Low-flow sampling techniques were used, as described in SHA’s November 1996 “Groundwater Sampling and Quality Assurance Plan, Town Garage/Radio Beacon Site, Londonderry, New Hampshire.” Water quality parameters including temperature, pH, specific conductance, and dissolved oxygen were monitored during purging using an YSI Model 600 XLM multi-parameter water quality meter with an in-line flow cell. Upon

1 Replacement monitoring well MW-2R was installed October 30, 2006 as a replacement to monitoring well MW-2D-6. The well installation was summarized in the Site’s 2006 Annual Summary Report dated January 31, 2006.Town of Londonderry 2049.02 \ 2008 Annual Rpt December 10, 2008 Page 2 

### parameter stabilization, the in-line flow cell was disconnected and a groundwater sample collected. A summary of stabilized water quality parameter data for the November 2008 round is presented on the Groundwater Quality Field Sampling Summary form included in Attachment A. Historical water quality parameter data are summarized in Table 1. The groundwater sample was placed in 40-milliliter (ml) glass vials with Teflon® septa, which were provided, pre-cleaned and pre-preserved with hydrochloric acid (HCl), by the analytical laboratory. Following collection, sample containers were stored in coolers packed with ice and delivered to Eastern Analytical, Inc. (EAI) of Concord, New Hampshire, a New Hampshire certified laboratory, for volatile organic compound (VOC) analysis by USEPA Method 8260B. The sample was handled and transported following standard chain-of-custody procedures. A trip blank, prepared beforehand by EAI, was also analyzed for VOCs by USEPA Method 8260B. A copy of EAI’s analytical laboratory data report for this monitoring round is included in Attachment B.
SUMMARY OF ANALYTICAL RESULTS The November 2008 groundwater quality monitoring results for monitoring well MW-2R indicate that 1,1-dichloroethane (1,1-DCA), and 1,1-dichloroethene (1,1-DCE) were the only VOCs detected in the sample from MW-2R. There was only one exceedance of groundwater cleanup levels, namely 1,1-DCE at a concentration of 9 μ g/l. The concentrations of the VOCs observed for the November 2008 round are lower than the results for the three prior rounds that included well MW-2R, and compared to the historical results for MW-2R and MW-2D-6, are the lowest detected to date for this monitoring location. The water quality analytical database for site monitoring wells is presented in Table 2. A concentration versus time plot for VOCs for MW-2D-6 and MW-2R is presented as Figure 2. Constituent-specific cleanup levels established for the Site are indicated on the concentration versus time plot.
CLOSING Results of the November 2008 groundwater monitoring at the Town Garage/Radio Beacon Site in Londonderry, New Hampshire indicate improving groundwater quality conditions in the vicinity of monitoring well MW-2R, although 1,1-DCE continues to be detected at a concentration slightly above its cleanup level.

# Sanborn, Head and Associate s, Inc. Digitally signed by Sanborn, Head and Associates, Inc. DN: cn=Sanborn, Head and Associates, Inc., o=Sanborn, Head and Associates, Inc., ou, email=lsmith@sanbornh ead.com, c=US Date: 2008.12.11 15:10:49 -05'00'

## TABLES

### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Sampling Location Sampling Date Ground Surface Elevation (Feet MSL) Reference Point Elevation (Feet MSL) Groundwater Elevation (Feet MSL) Temperature (°C) Specific Conductance ( ȝs/cm) Dissolved Oxygen (mg/l) pH (Standard

Units) Monitoring Wells 11/26/1996 357.60 9.0 2,910 8.3 6.7 11/20/1997 354.27 11.7 4,160 6.5 5.8

1/1/1998 11/22/1999 351.45 12.2 1,080 3.3 6.1 12/6/2000 352.00** 9.0** 1,500** 7.8** 5.8** 11/19/2001 348.72 13.1 2,870 7.7 5.8 11/15/2002 352.09 13.1 775 3.7 6.0 11/4/2003 352.20 13.0 560 9.8 6.1 11/3/2004 349.84 13.8 1,200 3.8 5.6 11/28/2005 352.51 10.3 1,350 4.9 5.5 11/27/1996 337.65 6.8 7,700 5.7 6.7 11/20/1997 336.20 7.9 5,750 1.5 6.3 11/10/1998 335.44 8.4 7,590 5.3 6.3 11/23/1999 335.54 11.7 6,620 1.2 6.5 11/21/2000 335.93 9.3 6,900 7.8 6.5 11/19/2001 333.81 10.7 6,730 0.0 6.4 11/15/2002 334 69 11 4 6 380 0 1 6 4 MW-2S

MW-2D-2 †† 201.77 359.29 361.79 Monitoring Well Destroyed

356.35 356.04

11/15/2002 334

. 69 11

. 4 6 , 380 0

. 1 6

. 4 11/4/2003 335.83 9.7 7,130 0.0 6.9 11/4/2004 334.50 10.5 7,220 0.6 6.5 11/28/2005 336.11 10.3 7,260 0.2 6.4 11/27/1996 351.95 6.9 29,100 2.9 6.9 11/20/1997 345.42 8.2 29,600 3.0 6.5 11/10/1998 347.87 8.9 37,600 8.4 6.7 11/23/1999 344.87 12.5 26,200 0.7 6.7 11/21/2000 349.08 10.4 23,600 2.2 6.8 11/19/2001 343.97 11.6 22,500 0.0 6.7 11/15/2002 348.10 13.3 16,500 0.0 6.7 11/4/2003 348.76 10.2 15,800 0.1 7.2 11/4/2004 346.78 11.5 15,100 0.7 7.0 11/29/2005 349.23 12.3 13,900 0.2 7.0 11/13/2006 351.99 12.5 13,700 0.5 7.0 12/11/2006 351.56 8.8 14,700 0.8 6.9 11/9/2007 352.07 12.9 12,500 0.3 6.8 11/6/2008 352.19 14.2 11,740 1.0 6.8 11/26/1996 334.69 6.9 12,900 0.2 6.9 11/20/1997 333.65 8.9 12,200 1.9 7.3 11/9/1998 333.33 8.5 11,800 0.2 7.6 11/22/1999 334.17 10.1 9,790 0.6 7.6 11/17/2000 334.47 9.9 9,000 0.5 7.5 11/19/2001 333.00 10.1 8,550 0.3 7.4 11/14/2002 333.79 10.0 8,940 

### † 7.5 11/5/2003 334.44 9.1 8,300 0.3 7.5 11/3/2004 333.98 9.7 7,930 0.3 7.3 11/28/2005 335.08 8.7 7,480 0.6 7.2 MW-2D-6

MW-3D MW-2R Installed 10/30/06 †† 315.77

339.72 341.54 355.99 355.69

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### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Sampling Location Sampling Date Ground Surface Elevation (Feet MSL) Reference Point Elevation (Feet MSL) Groundwater Elevation (Feet MSL) Temperature (°C) Specific Conductance ( ȝs/cm) Dissolved Oxygen (mg/l) pH (Standard

Units) 11/25/1996 345.71 6.4 58,600 2.6 7.0 11/20/1997 343.06 6.1 40,500 2.3 5.9 11/10/1998 344.44 7.9 35,400 0.0 6.7 11/23/1999 344.66 12.5 31,400 1.1 6.3 11/21/2000 345.81 7.4 28,200 4.1 6.7 11/20/2001 344.16 8.0 28,100 0.8 6.4 11/15/2002 344.06 11.9 23,700 0.0 6.9 11/4/2003 346.72 6.2 23,600 0.7 6.7 11/4/2004 344.19 8.6 21,100 0.7 6.5 11/29/2005 347.79 10.6 19,900 0.7 6.4 11/25/1996 372.18 7.5 3,400 2.5 7.0 11/20/1997 370.26 7.2 19,400 2.1 6.7 11/10/1998 370.26 7.1 19,000 0.3 7.2 11/23/1999 370.83 11.8 14,570 0.6 7.3 11/21/2000 371.18 8.1 12,900 3.3 7.3 11/20/2001 368.40 9.0 11,900 0.9 7.2 11/15/2002 369.64 10.9 11,000 0.1 7.2 11/4/2003 368 67 8 2 11 500 0 3 7 7 MW-4D-3 MW-4D-2

384.24 343.24 309.74 384.24

11/4/2003 368

. 67 8

. 2 11 , 500 0

. 3 7

. 7 11/4/2004 369.30 9.3 11,300 0.7 7.3 11/29/2005 371.63 9.9 11,400 0.2 7.3 11/25/1996 373.06 7.9 19,100 2.2 7.0 11/20/1997 370.26 9.4 12,000 4.9 5.2 11/10/1998 370.44 9.1 18,900 1.4 5.9 11/23/1999 372.22 13.6 16,500 0.6 6.0 12/6/2000 372.67** 9.5** 11,000** 1.3** 5.9** 11/20/2001 369.69 9.7 16,100 0.1 6.0 11/15/2002 370.15 11.6 14,300 0.4 5.9 11/4/2003 372.57 10.1 12,000 1.3 6.2 11/4/2004 371.66 9.4 14,400 0.8 6.2 11/29/2005 373.90 11.0 13,500 0.6 6.2 11/25/1996 376.86 6.9 17,700 3.8 7.0 11/20/1997 373.36 8.1 14,100 2.2 5.9 11/10/1998 372.88 7.9 18,500 1.2 6.6 11/23/1999 373.66 12.6 15,370 2.3 6.5 11/21/2000 374.24 8.6 15,200 5.0 6.5 11/26/1996 333.00 7.9 20,700 2.9 7.0 11/20/1997 * 7.7 20,200 2.6 6.3 11/9/1998 * 8.1 19,100 2.9 7.3 11/22/1999 331.39 10.0 15,210 0.4 7.2 11/17/2000 331.64 9.3 12,600 0.6 7.4 11/19/2001 330.36 9.4 12,000 0.8 7.2 11/14/2002 330.79 10.1 13,000 

### † 7.3 11/5/2003 331.54 8.5 11,200 1.0 7.4 11/3/2004 330.31 9.5 10,400 0.4 7.4 11/28/2005 331.66 9.1 8,640 0.0 7.3 MW-6D-2 338.35 241.28

MW-5S 383.00 385.00

MW-5D-4 382.63 327.53

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### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Sampling Location Sampling Date Ground Surface Elevation (Feet MSL) Reference Point Elevation (Feet MSL) Groundwater Elevation (Feet MSL) Temperature (°C) Specific Conductance ( ȝs/cm) Dissolved Oxygen (mg/l) pH (Standard

Units) 11/26/1996 * 7.8 11,000 2.9 6.9 11/20/1997 * 8.1 19,100 2.0 6.8 11/9/1998 * 7.8 19,800 0.5 7.1 11/22/1999 * 11.6 11,780 0.4 7.2 11/17/2000 * 10.0 11,300 0.4 7.3 11/19/2001 * 10.1 13,200 0.0 7.1 11/14/2002 * 10.3 12,300 

### † 7.2 11/5/2003 * 7.6 7,300 0.3 7.5 11/3/2004 * 9.9 7,080 0.1 7.2 11/28/2005 * 9.0 3,530 0.3 7.3 11/27/1996 339.69 9.7 24,400 6.5 7.0 11/20/1997 336.95 10.8 19,700 0.1 7.3 11/9/1998 337.35 12.0 16,200 0.0 7.5 11/22/1999 338.23 13.1 14,930 0.6 7.4 11/17/2000 339.08 12.9 11,800 0.3 7.1 11/19/2001 336.46 11.8 10,800 0.0 7.5 11/14/2002 338.53 11.0 9,790 0.1 7.3 11/4/2003 339 45 11 5 8 400 0 4 7 5 MW-8D 357.16 359.15 MW-6D-4 338.35 309.28

11/4/2003 339

. 45 11

. 5 8 , 400 0

. 4 7

. 5 11/3/2004 338.28 11.5 8,650 0.2 7.5 11/28/2005 339.45 11.6 8,000 1.5 8.2 Residential Wells 11/20/1997 - - - 2.4 2,930 + 6.3 11/18/1999 - - - 7.9 1,033 + 6.6 11/20/1997 - - - 10.7 950 + 7.5 11/27/1999 - - - 11 1,240 + 7.5 MW-16D 11/18/1999 - - - 6.9 533 + 6.9 11/20/1997 - - - 4.1 1,680 + 6.3 11/18/1999 - - - 6.8 1,944 + 6.6 11/20/1997 - - - 3.3 2,510 + 6.0 11/18/1999 - - - 6.8 8,980 + 6.5 11/16/2001 - - - 17.2 3,310 + 6.3 11/4/2003 - - - 8.5 980 + 6.6 11/28/2005 - - - 10.5 340 + 6.6 11/20/1997 - - - 3.4 500 + 6.4 11/18/1999 - - - 6.2 446 + 7.3 11/16/2001 - - - 17.4 420 + 7.0 11/4/2003 - - - 8.9 430 + 7.4 11/28/2005 - - - 10.6 490 + 7.5 11/20/1997 - - - 3.3 550 + 6.5 11/22/1999 - - - 14.5 545 + 6.9 11/20/1997 - - - 1.9 590 + 6.4 11/18/1999 - - - 8.2 660 + 6.7 11/20/2001 - - - 8.3 860 + 6.2 11/4/2003 - - - 9.5 960 + 7.2 11/28/2005 - - - 12.1 560 + 6.8 MW-23D MW-14D

MW-15D

MW-18D

MW-22D MW-19D

MW-20D

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### TABLE 1 Summary of Elevations and Field Screening - Monitoring Wells & Residential Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire
Notes:
1. Groundwater leve ls and water quality field screening parameters were measured by SHA on the dates indicated. 2. Groundwater level measurements in overburden and bedrock monitoring wells were obtained with either a Slope Indicator Company or a QED Environmental Systems electric water level meter. Groundwater level measurements in multi-level monitoring wells were obtained using previously-installed Geokon, Inc. vibrating wire pressure transducers and a Geokon, Inc. GK-401 readout box. 3. Water quality parameters obtained for monitoring wells in November 1996, 1997, and 1998 were measured in an in-line flow cell using an O.I. Analytical Aqua-CheckTM Water Analyzer; in November 1999 were measured in an in-line flow cell using an Orion Model 830 dissolved oxygen meter, an Orion Model 130 conductivity meter, and an Orion Model 260 pH meter; and in November/December 2000, November 2001, November 2002 (pH, temperature, and specific conductance), November 2003, November 2004, and November 2008 were measured using a YSI Model 600XLM multi-parameter water quality meter with in-line flow cell; and, in November 2005, November and December 2006, and November 2007 were measured using a YSI Model 556MPS multi-parameter water quality meter with in-line flow cell. In November 2002 dissolved oxygen was measured using a YSI 85 dissolved oxygen meter, located within a separate flow cell; the flow cell containing the dissolved oxygen probe was connected in series and upstream of the flow cell containing the pH, specific conductance, and temperature probes, as described in U.S. Environmental Protection Agency Region I, Low Stress (low flow) Purging and Sampling Procedure for the Collection of Ground Water Samples from Monitoring Wells, July 30, 1996, Revision 2. 4. Water quality parameters obtained for residential wells in November 1997 were measured using an Extech Oyster pH/conductivity probe, in November 1999 and 2001 using a Cole Parmer pH/Con Series 10 meter, and in November 2003 and 2005 using a Hanna HI 991301 portable pH/EC/TDS/Temperature meter. 5. Groundwater level measurements were referenced to the top of steel casing elevation for the overburden and bedrock monitoring wells and to the pressure transducer elevation in m ulti-level monitoring wells. Groundwater level measurements in MW-2R were referenced to p g top of PVC. Elevations are presented in feet above mean sea level (MSL).
6. Parameters reported for monitoring wells represent values obtained after parameter measurements stabilized; and for residential wells, represent values obtained after allowing the water to run for approximately 15 minutes to purge stagnant water from the piping system. 7. "*" indicates that the pressure transducers installed in MW-6D-2 and MW-6D-4 were not operational at the time of measurement. "†" indicates that the dissolved oxygen probe was not operational at the time of measurement. "††" indicates that ground surface elevation in the vicinity of monitoring well MW-2D was altered during construction of the Saddleback residential neighborhood in 1997/1998. "**" indicates measurement from December 6, 2000 when well was resampled because the initial sample collected on November 16, 2000 was analyzed by the laboratory past its holding time. "-" indicates that water level was not measured in the residential wells. "+" indicates that dissolved oxygen was not measured in groundwater from these wells. 8. The ground surface and reference elevations indicated for MW-2S are for the replacement well installed on November 18, 1999 by Capital Environmental Drilling, Inc. of Dunbarton, New Hampshire. Prior to the installation of the replacement well, the ground surface and reference elevations for MW-2S were 359.29 feet and 361.79 feet, respectively. 9. Prior to the 2001 sampling round, Amendment No. 1 to the Statement of Work (SOW) was approved by USEPA allowing sampling locations MW-5D-4, MW-12D, MW-14D, MW-15D, MW-16D, MW-18D, and MW-22D to be dropped from the groundwater monitoring program.10. Prior to the 2006 sampling round, Revised Amendment No. 2 to the SOW was approved by USEPA allowing sampling locations MW2S, MW-2D-2, MW-2D-6, MW-3D, MW-4D-2, MW-4D-3, MW-5S, MW-6D-2, MW-6D-4, MW-8D, MW-19D, MW-20D, and MW23D to be dropped from the groundwater monitoring program. 11. Monitoring well MW-2R was installed on October 30, 2006 as a replacement to monitoring well MW-2D-6.

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μg/l 200 μg/l Nov-90 440 BDL BDL BDL 5/9/1994 257 BDL BDL BDL 2.20 - THM 11/3/1994 NS BDL BDL BDL 4.20 - THM 4/26/1995 192 BDL BDL BDL 2.5 - THM 11/1/1990 NS BDL BDL BDL 5/9/1994 833 BDL BDL BDL 12/6/1994 797 BDL BDL BDL 4/26/1995 810 BDL BDL BDL

Nov-90 3,410 74 18 790 5/11/1994 1,682 59 15 200 11/3/1994 1,170 150 29 450 4/21/1995 1,211 78 25 200 10/12/1995 2,440 150 31 410 14 - MTBE

5/2/1996 760 30 6.7 79 11/26/1996 NS 23 4 59 11/20/1997 NS 33 8 81 Replacement Well installed 11/18/99 

### 11/22/1999 NS BDL BDL 4 12/6/2000 NS 4 1 9 11/19/2001 NS 6 2 12 8 THM Date

MW-1S

MW-1D

MW-2S

11/19/2001 NS 6 2 12 8 - THM 11/15/2002 NS BDL BDL BDL 11/4/2003 NS BDL BDL BDL 5 - THM 11/3/2004 NS BDL BDL BDL 11/28/2005 NS BDL BDL BDL MW-2D* Nov-90 3,960 46 41 BDL 4/20/1995 5,749 100 9.1 7.3 180 - MTBE 24 - Toluene

10/13/1995 4,090 31 5.2 6.3 110 - MEK 4.8 - THM 6.1 - Toluene 2.2 - Carbon disulfide

5/1/1996 4,100 69 12 5.3 3.5 - Carbon disulfide 3.3 - THM 130 - MEK 10 - Toluene 5.6 - Chloroethane 12/6/1994 5,420 46 4.5 6.9 12 - Toluene 390 - MEK 4/20/1995 5,484 140 13 BDL 72 - Toluene 10/13/1995 4,270 160 17 BDL 75 - Toluene 6.7 - Dimethyl sulfide 5/1/1996 2,800 87 19 BDL 64 - Acetone 8.4 - Carbon disulfide 120 - Toluene 11/27/1996 NS 20 BDL BDL 180 - Toluene 600 - MEK MW-2S

MW-2D-1

MW-2D-2

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μ g/l 200 μg/l Date

11/20/1997 NS 12 9 BDL 82 - Toluene 220 - MEK 10 - 2-Hexanone 11/10/1998 NS 9 8 BDL 67 - Toluene 60 - MEK 11/23/1999 NS 5 4 BDL 14 - Toluene 10 - MEK
11/21/2000 NS 6 4 BDL 10 - Acetone 30 - MEK 11 - Toluene
11/19/2001 NS 6 4 BDL 20 - Acetone 20 - MEK 14 - Toluene
11/15/2002 NS 4 3 BDL 20 - Acetone 10 - MEK 13 - Toluene 11/4/2003 NS 4 3 BDL 10 - Acetone 9 - Toluene 11/4/2004 N S 6 3 BDL 20 - Acetone 11 T l MW-2D-2

(cont.)

11 - T o luene 11/28/2005 NS 6 3 BDL 20 - Acetone 13 - Toluene 12/6/1994 2,339 7 6.2 2.6 1.20 - Toluene 4/20/1995 2,458 6.5 5.1 1.7 1.20 - Toluene 10/13/1995 2,410 6.6 5.5 1.7 1.5 - MTBE

5/1/1996 2,400 7.8 9.2 BDL 3.3 - MTBE 6/3/1994 NS BDL BDL 7.6 12/6/1994 7,390 11 8 6.4 4/20/1995 7,979 12 8 5.5 10/12/1995 8,810 14 9.9 5.7 2 - MTBE

5/1/1996 8,700 22 20 9.9 2.8 - MTBE 6/3/1994 36,000 33 17 34 12/6/1994 18,980 19 15 23 4/20/1995 17,940 34 20 27 10/12/1995 17,400 37 25 20 2.4 - MTBE

5/1/1996 18,800 50 44 30 2.1 - Chloroethane 6/3/1994 10,900 100 37 300 12/6/1994 12,410 100 48 360 4/20/1995 11,530 120 58 280 10/12/1995 9,000 120 62 320

5/1/1996 11,300 150 86 360 6.9 - Chloroethane 11/27/1996 NS 110 50 240 11/20/1997 NS 100 64 160 1 - Toluene 11/10/1998 NS 110 58 150 1 - Toluene 7 - Chloroethane 11/23/1999 NS 86 40 85 8 - Chloroethane 11/21/2000 NS 120 48 56 13 - Chloroethane MW-2D-5 MW-2D-3

MW-2D-4

MW-2D-6

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μ g/l 200 μg/l Date

11/19/2001 NS 100 48 52 17 - Chloroethane 11/15/2002 NS 57 28 28 7 - Chloroethane 11/4/2003 NS 57 28 19 10 - Chloroethane 11/4/2004 NS 46 18 11 7 - Chloroethane 11/29/2005 NS 36 18 8 5 - Chloroethane 11/13/2006 NS 33 18 7 5 - Chloroethane 12/11/2006 NS 36 21 8 6 - Chloroethane 11/9/2007 NS 21 14 3 11/6/2008 NS 17 9 BDL Nov-90 42 BDL BDL BDL 5/17/1994 39 BDL BDL BDL 11/3/1994 74 6.8 BDL BDL 4/17/1995 29 BDL BDL BDL

10/11/1995 137 BDL BDL BDL 1.1 - Chloroethane 1.7 - THM 2.5 - MTBE 5/13/1996 20 BDL BDL BDL

Nov-90 580 15 BDL BDL 5/17/1994 4 537 11 5 8 BDL MW-3S MW-2R Installed 10/30/06



### MW-2D-6

(cont.)

5/17/1994 4 , 537 11 5

. 8 BDL 12/1/1994 4,260 11 6.2 BDL 4/17/1995 4,425 9.4 5.1 BDL 10/11/1995 212 11 5.2 BDL 5/13/1996 4,400 12 8.3 BDL 11/26/1996 NS 8 4 BDL 11/20/1997 NS 8 6 BDL 11/9/1998 NS 7 4 BDL 11/22/1999 NS 5 3 BDL 11/17/2000 NS 6 2 BDL 11/19/2001 NS 6 2 BDL 11/14/2002 NS 4 2 BDL 11/5/2003 NS 4 1 BDL 11/3/2004 NS 3 1 BDL 11/28/2005 NS 3 1 BDL

Nov-90 2,880 BDL BDL BDL 5/11/1994 1,124 4.2 BDL BDL 1.40 - Chloroethane 11/3/1994 3,124 6.6 BDL BDL 4/25/1995 2,010 3.6 BDL BDL 4.10 - MTBE 2.20 - Chloroethane 10/17/1995 3,300 4.6 BDL BDL 1.2 - MTBE 4/24/1996 1,210 2.8 BDL BDL 2.7 - Chloroethane MW-4D* Nov-90 23,500 19 18 25

MW-4D-1 4/26/1996 3,810 7.7 5.9 3.8 2 - Carbon disulfide 6.2 - THM 43 - MEK 2.1 - Methylene chloride 2.9 - Toluene MW-3D

MW-4S

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### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μ g/l 200 μg/l Date

4/26/1995 24,850 5.1 7.5 4.2 3.50 - THM 9.80 - Toluene

4/26/1996 22,300 8 11 4.5 2.5 - Carbon disulfide 3.2 - THM 3 - Methylene Chloride 4.5 - Toluene 11/25/1996 NS 7 7 3 3 - THM 4 - Toluene 11/20/1997 NS 10 10 2 2 - THM 3 - Toluene 11/10/1998 NS 9 5 BDL 2 - Toluene 11/23/1999 NS 9 5 BDL 4 - Toluene 20 - MEK
11/21/2000 NS 13 6 BDL 20 - Acetone 50 - MEK 4 - Toluene

11/20/2001 NS 13 8 3 20 - Acetone 2 -THM 40 - MEK 4 l MW-4D-2

4- To luene 11/15/2002 NS 6 2 BDL 20 - MEK 3 - Toluene

11/4/2003 NS 9 6 3 20 - Acetone 2 -THM 30 - MEK 4 - Toluene 11/4/2004 NS 9 5 BDL 20 - MEK 4 - Toluene
11/29/2005 NS 9 6 2 10 - Acetone 20 - MEK 4 - Toluene 6/2/1994 22,000 7.6 6.5 41 3.50 - MTBE 12/6/1994 19,720 9.2 6.9 43 2.90 - MTBE 4/26/1995 12,000 9.5 7.5 31 10/17/1995 12,900 8.9 3.6 21 2.2 - MTBE 4/26/1996 13,700 11 5.6 24 2.4 - MTBE 2.7 - Chloroethane 11/25/1996 NS 9 2 15 11/20/1997 NS 10 2 10 11/10/1998 NS 7 1 6 11/23/1999 NS 4 BDL 3 11/21/2000 NS 3 BDL BDL 11/20/2001 NS 3 BDL BDL 11/15/2002 NS BDL BDL BDL 11/4/2003 NS BDL BDL BDL 11/4/2004 NS BDL BDL BDL 11/29/2005 NS BDL BDL BDL MW-4D-3

S:\CONDATA\2000s\2049.02\originals\2008 Annual Report\Tables.xls Page 4 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μ g/l 200 μg/l Date
Nov-90 3,550 14 21 190 5/18/1994 3,640 2.2 13 89 11/3/1994 2,040 BDL 14 100 4/25/1995 4,072 BDL 9.4 43 10/17/1995 3,000 2.1 13 64 1.4 - PCE 4/24/1996 5,120 2.2 15 81 11/25/1996 NS BDL 9 55 11/20/1997 NS BDL 12 52 11/10/1998 NS BDL 5 27 11/23/1999 NS BDL 4 21 12/6/2000 NS BDL 5 19 7 - MTBE 11/20/2001 NS BDL 3 11 10 - MTBE 11/15/2002 NS BDL 4 11 5 - MTBE 11/4/2003 NS BDL 3 9 11/4/2004 NS BDL 2 5 11/29/2005 NS BDL 1 4 MW-5D* Nov-90 1,110 9 10 66

MW-5D-1 4/25/1996 NS 5 2.4 4.8 96 - Acetone 2.4 - Carbon disulfide MW-5S

20 - Toluene
MW-5D-2 4/25/1996 1,290 BDL BDL 7.1 5.2 - Carbon disulfide 5.1 - THM 4.1 - Toluene 6/3/1994 1,900 3.1 5.4 15 4/25/1996 1,790 BDL 2.6 6.3 6/3/1994 6,900 NS NS NS 12/6/1994 6,110 BDL BDL 4.5 4/25/1995 5,780 BDL BDL BDL 10/11/1995 5,760 1 TRACE 2.2 1.6 - MTBE 4/25/1996 6,030 BDL BDL 3.7 3.5 - MTBE 11/25/1996 NS BDL BDL 2 11/20/1997 NS BDL BDL BDL 11/10/1998 NS BDL BDL BDL 11/23/1999 NS BDL BDL BDL 11/21/2000 NS BDL BDL BDL 10 - MTBE

Nov-90 100 BDL BDL BDL 5/17/1994 191 BDL BDL BDL 5/25/1994 174 NS NS NS 11/3/1994 301 BDL BDL BDL 4/17/1995 118 BDL BDL BDL MW-6D* 11/1/1990 NS 13 6 BDL

6/2/1994 NS 6.6 2.5 BDL 3.80 - THM 7.50 - Toluene

340 - MEK 150 - Acetone
5/9/1996 8,480 16 2.2 BDL 7.8 - Carbon disulfide 40 - MEK 25 - Toluene MW-6D-1 MW-5D-4

MW-6S MW-5D-3

S:\CONDATA\2000s\2049.02\originals\2008 Annual Report\Tables.xls Page 5 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μ g/l 200 μg/l Date
6/2/1994 8,800 11 7 BDL 1.50 - Toluene 12/1/1994 9,050 13 7.1 BDL 4/20/1995 8,714 10 6.3 BDL 1.10 - MTBE 1.80 - Toluene 10/10/1995 9,300 12 6.1 BDL 2.3 - MTBE

5/9/1996 7,350 11 6.8 BDL 2.6 - Toluene 11/26/1996 NS 10 5 BDL 11/20/1997 NS 12 8 BDL 1 - Toluene 11/9/1998 NS 10 6 BDL 2 - Toluene 11/22/1999 NS 9 4 BDL 1 - Toluene 11/17/2000 NS 11 4 BDL 11/19/2001 NS 11 5 BDL 1 - Toluene 11/14/2002 NS 13 5 BDL 1 - Toluene 11/5/2003 NS 9 3 BDL 2 - Toluene 11/3/2004 NS 8 2 BDL 1 - Toluene 11/28/2005 NS 6 1 BDL 1 - Toluene

6/2/1994 2,200 3.2 1.5 BDL 12/1/1994 1,860 3.6 1.7 BDL 1.50 - Toluene 4/20/1995 2,379 3 1.4 BDL 1.50 - Toluene MW-6D-3 MW-6D-2

10/10/1995 7,850 14 6.3 BDL 2.40 - MTBE 5/9/1996 1,570 2.6 BDL BDL 6/2/1994 3,800 5.2 BDL BDL 2.60 - 1,2 DCA 12/1/1994 4,590 8.5 3.4 BDL 4/20/1995 3,621 5 2.1 BDL 10/10/1995 7,410 18 6.6 4.5 1.40 - MTBE

5/9/1996 2,210 3.5 2.1 BDL 11/26/1996 NS 6 3 BDL 1 - Toluene 11/20/1997 NS 18 9 BDL 11/9/1998 NS 16 7 BDL 1 - Toluene 11/22/1999 NS 9 4 BDL 11/17/2000 NS 12 4 BDL 11/19/2001 NS 17 6 BDL 11/14/2002 NS 16 5 BDL 1 - Toluene 11/5/2003 NS 7 2 BDL 11/3/2004 NS 6 2 BDL 11/28/2005 NS 2 BDL BDL 1 - Toluene

Nov-90 46 BDL BDL BDL 5/17/1994 95 BDL BDL BDL 11/3/1994 107 BDL BDL BDL 4/17/1995 70 BDL BDL BDL 11/1/1990 35 BDL BDL BDL 5/17/1994 105 BDL BDL BDL 12/6/1994 103 BDL BDL BDL 4/17/1995 99 BDL BDL BDL MW-7S MW-6D-4

MW-7D

S:\CONDATA\2000s\2049.02\originals\2008 Annual Report\Tables.xls Page 6 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire Monitoring Well Location Chloride (mg/l) 1,1-DCA (μg/l) 1,1-DCE (μg/l) 1,1,1-TCA (μ g/l) Other VOCs (μg/l) Cleanup Levels 250 mg/l 81 μg/l 7 μ g/l 200 μg/l Date
Nov-90 3,460 BDL BDL BDL 5/10/1994 597 BDL BDL BDL 11/3/1994 2,105 2.1 BDL 4.6 4/18/1995 895 BDL BDL BDL 10/16/1995 2,700 BDL BDL 5.8

5/3/1996 865 BDL BDL BDL Nov-90 9,130 48 28 BDL 5/10/1994 1,004 BDL BDL 2 11/3/1994 2,439 2.7 1.3 2.7 4/18/1995 1,122 BDL BDL 1.2 10/16/1995 8,700 11 6 2.9 1.8 - MTBE

5/3/1996 2,140 2.5 BDL 3 11/27/1996 NS 7 4 BDL 11/20/1997 NS 7 5 BDL 11/9/1998 NS 5 3 BDL 11/22/1999 NS 3 2 BDL 16 - Chloromethane 21 - Vinyl Chloride 20 - Acetone MW-8S

MW-8D

11/17/2000 N S 3 1 BDL 15 - Carbon Disulfide 46 - Benzene 9 - Toluene 4 - Styrene 11/19/2001 NS 4 1 BDL 11/14/2002 NS 2 1 BDL 11/4/2003 NS 3 1 BDL 11/3/2004 NS 2 BDL BDL 11/28/2005 NS BDL BDL BDL

Nov-90 530 BDL BDL BDL 5/11/1994 499 BDL BDL 1.6 11/3/1994 869 BDL BDL 12 4/18/1995 642 BDL BDL 1.2 10/13/1995 860 BDL BDL 11

5/2/1996 490 BDL BDL BDL 6/2/1996 191 BDL BDL BDL 12/8/1994 347 BDL BDL BDL 1.4 - Toluene 4/26/1995 228 BDL BDL BDL 10/17/1995 200 BDL BDL BDL

5/7/1996 130 BDL BDL BDL 5/18/1994 148 1.5 BDL BDL 1.1 - Chloromethane 12/9/1994 118 2.3 BDL BDL 4/26/1995 162 1.4 BDL BDL 10/17/1995 200 1.8 BDL BDL

5/7/1996 156 BDL BDL BDL RWGD MW-9S

RWGS

S:\CONDATA\2000s\2049.02\originals\2008 Annual Report\Tables.xls Page 7 of 8 Sanborn, Head & Associates, Inc.

### TABLE 2 Summary of VOCs and Chloride Analytical Data - Monitoring Wells Town Garage / Radio Beacon Site

Londonderry, New Hampshire

Notes: 1. "1,1 DCA" indicates 1,1-dichloroethane. "1,1 DCE" indicates 1,1-dichloroethene. "1,1,1 TCA" indicates 1,1,1-trichloroethane. "MEK" indicates methyl-ethyl-ketone. "MTBE" indicates methyl-t-butyl ether. "THM" indicates chloroform. "BDL" indicates below detection limit. "NS" indicates not sampled.
2. Underline indicates that the well was sampled during 2008. 3. Shading indicates exceedance of Site Cleanup Level. 4. "*" indicates that monitoring wells MW-2D, MW-4D, MW-5D, and MW-6D were converted to permanent Solinst multilevel wells in 1992. 5. Cleanup levels: chloride = 250 mg/l; 1,1 DCA = 81 μ g/l; 1,1 DCE = 7 μ g/l; 1,1,1 TCA = 200 μ g/l. Note that exceedances are shaded. 6. Although not shaded in the above table, the November 2000 sample from MW-8D contained two analytes that exceeded MCLs: benzene and vinyl chloride, with MCLs of 5 μ g/l and 2 μ g/l respectively.

S:\CONDATA\2000s\2049.02\originals\2008 Annual Report\Tables.xls Page 8 of 8 Sanborn, Head & Associates, Inc.

## FIGURES• MW-200 $MW-5S APPROXIMATE GROUrWWATER MMAGEMEm ZmJE (GMZ) BOUrmARY**RESIDE~HIAL** WELL REMOVED FROM THE**GROU~WWATER Mm~ITORI~~G**  PROGRAM AS DESCRIBED lfJ THE JUrJE 2006 REV1SED AMErmMErn rw. 2 TO THE STATEMErn OF WORK (SOW)
MmJITORirJG WELL REMOVED FROM THE GROUrJDWATER MmJITORirJG PROGRAM MD DECOMMISSIDrJED DURirJG THE FALL 2007 AS DESCRIBED lrJ THE JUrJE 2006 REVISED AMErmMErn rw. 2 TO THE SOW
MmJITORirJG WELL REMOVED FROM THE GROUrJDWATER MmJITORirJG PROGRAM Nm rWT DECOMMISSIDrJED $MW"-6D-2,4 AS DESCRIBED lrJ THE JUrJE 2006 REV1SED AMErmMErn rw. 2 TO THE SOW
® MW-2R



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2049.021001000 )Figure 2Concentration vs. Time PlotMW-2D-6/MW-2RTown Garage/Radio Beacon SiteLondonderry, New HampshireS:\CONDATA\2000s\2049.02\originals\2008 Annual Report\MonWellPlot.xlsPage 1 of 1 Sanborn, Head & Associates, Inc.0.1110Jan-94 Jan-95 Jan-96 Jan-97 Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 Jan-09

Concentration ( μ g/l )Sample Dates1,1,1-TCA1,1-DCA1,1-DCE1,1,1-TCA Cleanup Goal (200)1,1-DCA Cleanup Goal (81)1,1-DCE Cleanup Goal (7)MW-2R InstalledMonitoring well MW-2D-6 was replaced by monitoringwell MW-2R on October 30, 2006. Data points shownfrom January 1994 through December 2005 reflect samplescollected from monitoring well MW-2D-6. Data pointsshown after January 2006 reflect samples collected frommonitoring well MW-2R.

## ATTACHMENT A GROUNDWATER QUALITY FIELD SAMPLING SUMMARY FORM

### Groundwater Quality Field Sampling Summary

d d i)

Comments Project Number: 2049.02 Date: November 6, 2008 Project Name: Former Londonderry Town Garage Project Location: Londonderry, New Hampshire pH Meter: YSI 600 Project Manager: S. Nerney Conductivity Meter: YSI 600 Collector: M. Thomas Water Level Meter: MP-30 Weather: Rain, 40s Dissolved Oxygen: YSI 600 Field Measurements Sampling Location MW-2R Reference Point PVC Reference Point Elevation (feet) 355.69 Depth to Floating Product (feet) - Depth to Water (feet) 3.50 Water Table Elevation (feet) 352.19 Depth to Bottom (feet) 48.5

H( d d i ) pH ( stan ar un ts 6 8

. Specific Conductance ( μ S/cm) 11,740 Temperature (oC) 14.2 Dissolved Oxygen (mg/L) 1.0 Date of Sample 6-Nov Sample Time 1140 Comment Reference Number 1

1. Sample collected using low flow sampling techniques.

S:\CONDATA\2000s\2049.02\originals\2008 Annual Report\20081106 GwQFSS.xlsx Page 1 of 1 Sanborn, Head & Associates, Inc.

## ATTACHMENT B
ANALYTICAL LABORATORY DATA REPORT

# ----~~~---------------------------e __ a_s_t_e

__ r_n

__ a_n

__ a_l_yt

__ i_c_a

__ l

___ II D Scott Nerney Sanborn , Head 

### & Associates , Inc

. (NH) 20 Foundry Street Concord, NH 03301

Subject: Laboratory Report Eastern Analytical , Inc

. ID :

### ·~ 

## 1 ( 

# 2C8

74438 Client Identification : Date Received : Londonderry Town Garage (LTG) /2049

. 01 -Nov

. 2008 11/6/2008
Dear Mr

. Nerney : Enclosed please find the laboratory report for the above ident i fied project. All analyses were performed in accordance with our QNQC Prog ram. Unless otherwise stated, holding times , preservation techniques, container types , and sample cond it i ons adhered to EPA Protocol. Samples wh ich were collected by Eastern Analytical , Inc

. (EAI) were collected i n accordance with approved EPA procedures

. Eastern Analyt i cal , Inc

. (EAI} certifies that the enclosed test resu lts meet all requirem e nts of NELAP and other app licable state cert i fications

. Please refer to our website at www

. eailabs

. com for a copy of our NELAP certificate and accred i ted parameters

. The following standard abbreviations and conventions app ly throughout all EAI reports : Solid samples are reported on a dry weight basis , unless otherwise noted 

### < : " less than" followed by the detection limit TNR: Tes ting Not Requested NO : None Detected , no established detect ion limit RL: Reporting Limits %R: 

### % Recovery
Eastern Analyt i ca l In c

. maintains certificat i on in the following states : Connect i cut (PH-0492) , Maine (NH005) , Massachusetts (M-NH005), New Hampshire/NELAP ( 1012) , Rhode Island (269) and Vermont {VT1012}

. 

### '**\~'.'Ire\**

This report package contains the following information: Sample Conditions summary, Analytical Results/Data and copies of the Chain of Custody

. This report may not be reproduced except in full , without the the written approval of the laboratory

. 

### Analytical Deviation & 

### QA/QC Documentation: Qual i ty Contro l Samples ass ociated with this project are incl uded i n th i s report

. At a minimum , a Method Blank and Laboratory Control Samp l e (LCS) are reported

. Matrix Spikes and Dup licates are reported where applicab le

. Deviations are narrated on the QC pages

. If you have any questions regarding the resu lts contained within , please feel f ree to directly contact me , or the chem i st(s) who performed the test ing in questio n

. Unless otherw i se requested , we will dispose of the sample{s) 30 days fro m the sample receipt date

. We appreciate th is opportunity to be of service and look forwa rd to your continued patronage

. Sincerely ,

Lorraine Olashaw , Lab Director f

.. r ·rn ,\ n .lyllcal, In<
· . ••• I, 'I 

### www
.ea ilabs

.com 

# 7 #of pages (excl udi ng cover letter) 

### 1 f I I

- _**~** ·- \ r

## SAMPLE C ONDITI O NS PAGE

Eastern Analytical, Inc

. 10#: 

### 74438 Client: Sanborn , Head & A ssoc i ate s, In c. ( NH) Client Designation: L on d o nderry T o w n G ar a ge ( LTG ) 1 2 0 4 9.0 1

- N ov. 200 8
T empe rature u p on r e c e i pt ( ° C) : 

## 1 R ece i v ed on Ice or co l d p ac ks ( Y es/ No ): 

### y
D a t e Date Sa mp le % Dry Lab iD Sa m pl e ID Receive d S am p led Matri x W eight E xcept i on s /Commen ts ( oth er t han th e rma l pre se rvation)
74438.01 MW-2R 74438.02 Trip Blank 11 /6/08 11/6/08 aqueous 11/6/08 10/30/08 aqueous Adheres to Sample Acceptance Policy Ad h eres to Sample Acceptance Policy

Samples were properly preserved and the pH measured when applicable unless otherwise noted

. Analysis ofsolids forpH, Flashpoint, lgnitibility, Paint Filter, Corrosivity, Conductivity and Specific Gravity are reported on an "as received " basis. All results contained in this report relate only to the above listed samples. References include: 1) EPA 600/4-79

- 020, 1983 2) Standard Methods for Examination of Water and Wastewater : lnorganics, 19th Edition, 1995; Microbiology, 20th Edition, 1998 3) Test Methods for Evaluating Solid Waste SW 846 3rd Edition including updates IVA and /VB 4) Hach Water Analysis Handbook, 2nd edition, 1992 

## eastern analytical, inc. www .eailabs.com Phone: (603) 228-0525 

## 1

# LAB ORA TORY REPORT

Eastern Analytical , Inc. 10#: 

## 7443 8 Client: Sanb orn , H ead & Assoc iate s , I nc. ( N H) Sample I D : MW-2R

Lab Sa m ple I D : 74438.01 Matrix: aqueous Date Samp l ed : 11 /6/08 Date Received : 11/6/08 Units: ug /1 Date of Analysis: 11/12/08 Ana lyst: BAM Method : 8260B Di l ut ion Facto r:
Dichlo rod ifluoromet hane <5 Chlorome th ane <2 Vinyl chlor id e <2 Bromomethane <2 Chloroethane <5 Trichlorofluoro meth ane <5 Diethyl Ether <5 Acetone < 10 1 , 1-Dich loroethene 9 tert-Butyl Alcohol (TBA) < 30 Methylene chloride <5 Carbon disulfide <5 Methyl -t

- buty l ether(MTBE) <5 Ethyl-t-butyl ether(ETBE) <5 I sopropyl ethe r(DI PE) <5 tert-a my l methyl et h er(TAME) <5 trans-1 ,2-Dichloroethene <2 1 , 1- Di chloroethane 17 2,2-D i c h loropropane <2 cis-1 ,2-Dich loroethene <2 2-Butano ne(MEK) < 10 Bromoch lorome t hane <2 Tetrahydrofura n(THF) < 10 Chloroform <2 1 ,1, 1-Trichloroethane <2 Carbon tetrachloride <2 1, 1-Dichloropropene <2 Benzene < 1 1, 2-Dich loroethane <2 Trichloroethene <2 1 , 2-Dichloropropane <2 Dibromomethane <2 Bromodichlorome t hane < 0.5 4-Methyl-2-pen tanon e(MIBK) <10 cis-1 ,3-Dichloropropene <2 To lu ene <1 trans- 1 ,3-Dichloroprope ne <2 1, 1 ,2-Tri c h loroethane <2 2

- Hexano n e < 1 0 Tetrachloroethene <2 1 , 3-Dich l oropropane <2 Dibromochloro m ethane <2 1,2-Dibromoethane(EDB) <2 Chlo r obenzene <2 1,1, 1 , 2-Tetrachloroethane <2 Ethvlbenzene < 1 

## eastern analytical , inc. Client Des ignation: L on d o n derry To wn Garage ( LT G ) 1 2049 .01

- Nov. 20 08 Trip Blank

74438

. 02 aqueous 10/30/08

11/6/08 ug/l 11 / 12/08 BAM 82608

<5 <2 <2 <2 <5 <5 <5 <10

< 1 < 30

<5 <5 <5 <5 <5 <5 <2 < 2 <2 <2 < 10

<2 < 10

<2 <2 <2 <2 < 1 <2 <2 <2 <2 < 0.5 < 10

<2 <1 <2 <2 < 10

<2 <2 <2 <2 <2 <2 < 1

www.eailabs

. com Phone: (603) 228-0525 

## 2

# LABORAT ORY REPORT

East e rn Analytical , Inc. 10#: 

## 744 3 8 C lien t: Sanborn, H ead & 

### Assoc i ates , Inc. 

### ( NH } Sample 10 : MW-2R

Lab Sample 10: 74438.01 M atrix : aqueous Date Sampled : 11/6/08 Date Received : 1 1/6/08 Units: ug /1 Date of Analysis : 11/12/08 Analyst : BAM Method : 8260B Dilution Factor: 1**mp~Xyle e**  < 1 o-Xylene < 1 Styren e < 1 Bromoform <2 IsoPropy lbenzene <1 Bromobenzene <2 1,1 ,2,2-Tetrachloroethane <2 1 ,2 ,3-Trichloro propane <2 n-Propylbenzene < 1 2-C h lo rotolue ne <2 4-Chlo rotolu ene <2 1 ,3, 5-Trimethylbenzene < 1 tert-Butylbe n zene < 1 1 ,2,4-Trimethy l benzene < 1 sec-Butylbenze ne < 1 1 ,3-Dichlorobenzene <1 p-lsopropyltoluene < 1 1 ,4-D i chlorobenzene <1 1 , 2-Dichl orobenzene < 1 n-Butylbenzene < 1 1 ,2 -Dibromo-3-chloropropane <2 1 ,3,5- Trichlorobenzene < 1 1 ,2,4-Tr ichlorobenzene < 1 Hexach lorob utadiene < 0.5 Na phthalene <5 1 ,2,3-T richlorobenzene <1 4- Brom ofluorobenzene (surr) 1 05 "'oR 1 ,2-Dichlorobenzene-d 4 (surr) 101 "'oR Toluene-dB (surr) 98 "'oR



## e astern analytical , inc. C l ient Designation: L ondonderry T own Garage 

### ( l T G} 1 2049 .01

- N ov

. 2008 Trip Blank

74438.02 aqueous 10/30/08

11/6/08 ug/1 11/12/08 BAM 8260B

< 1 < 1 < 1 <2 < 1 <2 <2 <2 < 1 <2 <2 < 1 < 1 < 1 < 1 < 1 < 1 <1 < 1 < 1 <2 < 1 < 1 < 0.5

<5 < 1 103 "'oR 101 "'o R

97 "'oR

www.eailabs.com Phone : (603) 228-0525 

## 3

# IA.ilA I LAB ORA TOR Y REPORT

Eas t e rn An al yti ca l , I n c

. 10#: 7443 8 B atc h ID:

Client: S a n bo r n, H e ad 

### & Associate s, Inc

. Client Designation: Lo n donderry T o w n G arage ( L TG) 

## QC Report 2049 .0 1

- N o v

. 2 0 08 D a t e of Analys is P a ra me te r Nam e Bla n k LCS L CS Dup U nits Method



# -- - -

Dichlorodiftuoromethane <5 ug/1 11/11/08 82608 Chloromethane <2 ug/1 11/11/08 82608 Vinyl chloride <2 ug/1 11 /11/08 82608 Bromomethane <2 ug/1 11/11/08 82608 Chloroethane <5 ug/1 11/1 1/08 82608 Trich l orofluoromethane <5 ug/1 11/11/08 82608 Diethyl Ether <5 u g/1 11/11/08 82608 Acetone <10 ug/1 11/11 /08 82608 1, 1 -Dichloroethene <1 20 {100 %R) 21 {106 %R) {6 RPD) ug/1 11/11/08 82608 tert-Butyl Alcoho l {T8A) < 30 ug/1 11/11/08 82608 Methylene chloride <5 ug/1 11/11/08 82608 Carbon disulfide <5 ug/1 11/11 /08 82608 Me t hyl-t-butyl ether{MTBE) <5 ug/1 11 /1 1 /08 82608 Ethyl -1-butyl ether{ETBE) <5 ug/1 11/11/08 82608 Isopropyl ether(DIPE) <5 ug/1 11/11 /08 82608 tert-amyl methyl ether{TAME) <5 ug/1 11/11108 82608 trans-1,2-Dichloroethene <2 ug/1 11/11 /08 82608 1 ,1-Dichloroethane <2 ug/1 11/11 /08 82608 2,2-Dichloropropane <2 ug/1 11/11 /08 82608 cis-1,2-Dichloroethene <2 ug/1 11 /11/08 82608 2-Butanone(MEK) < 10 ug/1 11/11/08 82608 Bromochloromethane <2 ug/1 11/11/08 82608 Tetrahydrofuran(THF) < 10 ug/1 1 1 /11/08 82608 Chloroform <2 ug/1 11/11/08 82608 1 ,1,1- Trich l oroethane <2 ug/1 11/11/08 82608 Carbon tetrachloride <2 ug/1 1 1/11/08 82608 1, 1 -Di chloropropene <2 ug/1 11/11/08 82608 Benzene < 1 21 (104 %R) 21 {107 %R) {3 RPD) ug/1 11/11/08 82608 1,2-Dichloroethane <2 ug/1 11/11/08 82608 T richloroethene <2 24 (118 %R) 24 (121 %R) (3 RPD) ug/1 11/11 /08 82608 1,2-Dichloropropane <2 ug/1 11/11/08 82608 Dibromomethane <2 ug/1 11111/08 82608 Bromodichloromethane < 0.5 ug/1 11111 /08 82608 4-Methyl -2-pentanone(MIBK) < 10 ug/1 11/11 /08 82608 cis-1,3-Dichloropropene <2 ug/1 1 1/11/08 82608 To l uene <1 20 (100 %R) 21 (103 %R) (3 RPD) ug/1 11/11 /08 82608 trans-1 ,3- Dichloropropene <2 ug/1 11/11/08 82608 1 , 1 ,2-Trichloroethane <2 ug/1 11/11/08 82608 2-Hexanone < 10 ug/1 11/11/08 82608 T etrachloroethene <2 ug/1 11/11 /08 82608 1,3-Dich loropropane <2 ug/1 11/11/08 82608 Dibromochlorometha ne <2 ug/1 11/11/08 82608 1,2-Dibromoethane(EDB) <2 ug/1 11/11/08 82608 Chlorobenzene <2 22 (108 %R) 22 (108 % R) {0 RPD) ug/1 1 1/11 /08 82608


## e a s t e rn analytical , inc. www .eailabs.com Phone: {603) 228-0525 

## 4

# l!lilAI LABORATORY REPORT

Eastern Analytical, Inc. 10#:74438 Batch 10 :
Client: Sanborn , H e ad 

### & Assoc i ates, Inc

. Client Des ign ation: L o n d o nd e rry Town Garage ( LT G) 

## QC Report 2049

. 01

- No v. 20 0 8 D ate o f Ana l ysis P a rameter N am e B l ank LCS L C S Du p U n i ts Method 1,1, 1 , 2-Tetrachloroethane <2 ug/1 11/11 /08 82608 Ethyl benzene < 1 ug/1 1 1 /11/08 82608 mp-Xylene <1 ug/1 11/11/08 82608 a-Xylene < 1 u g/1 11 /1110 8 82608 Styrene < 1 ug/ 1 11/11 /08 82608 Bromoform <2 ug/1 11/11/08 82608 lsoPropylbenzene < 1 ugll 11/11/08 82608 8romobenzene <2 ug/1 11/11108 82608 1,1 ,2 ,2-Tetrachloroethane <2 ug/1 1 1/11/08 82608 1 ,2,3-Trichloropropane <2 ug/1 11/11/08 82608 n-Propylbenzene < 1 ug/1 11/11/08 82608 2-Chloroto l ue n e <2 ug/1 11 / 11 /08 82608 4

- Chlorotoluene <2 ug/1 1 1/11 /08 82608 1 ,3,5-Trimethylbenzene < 1 ug/1 11/11/08 82608 tert-8uty l benzene < 1 ug/1 11/11/08 82608 1 ,2, 4- Trimethy l benzene < 1 ug/1 11/11108 82608 sec-8utylbenzene <1 ug/1 1 1 /11/08 82608 1 , 3-Dichlorobenzene <1 ug/1 11/11/08 82608 p-lsopropyltoluene < 1 ug/1 11 / 11/08 82608 1,4-Dichlorobenzene < 1 ug/1 11 / 11 /08 82608 1 ,2-Dichlorobenze n e < 1 ugfl 11/11/08 82608 n-8utylbenzene < 1 ugfl 11/11/08 82608 1 , 2-Dibromo-3-chloropropane <2 ugfl 11111 /08 82608 1,3,5- Trichlorobenzene < 1 ug/1 11/1 1/08 82608 1,2,4- Trichlorobenzene < 1 ugfl 11/11/08 82608 Hexachlorobutadiene < 0.5 ug /1 11/11/08 82608 Na phthalene <5 u g/1 11 / 1 1/08 82608 1 ,2,3-Trichlorobenzene < 1 ug/1 1 1/11 /08 82608 4-8romofluorobenzene {surr) 1 03 %R 110 %R 108 %R % Rec 11/11/08 82608 1,2-Dichlorobenzene-d4 (surr) 103 %R 101 %R 100 %R % Rec 11/11/08 82608 Toluene-dB (surr) 98%R 98%R 99%R 

### % Rec 11 / 1 1/0 8 82608



## eastern analytical, inc. www .eaila bs

. com Phone: (603) 228-0525 

## 5

# LABORATOR Y REP O RT

E astern Ana lytica l , Inc. 10# : 74438 B atc h ID : Client: Sanborn , Head & 

### Associates , I nc. (NH) Client Designation: Londonderry Town Garage (LTG ) 1 

### 2049.01 -Nov

. 2008



# --- ---- - --- -- -- --- Volatile Organic Compounds QC limits and Narrative Summary

Matrix: Units: EPA Method Surrogate Recovery 4-Bromofluorobenzene 1 ,2-Dichlorobenzene-0 4 Toluene-dB

Matrix Spike Recovery 1, 1-Dich loroe t hene Trichloroethene Benzene Toluene Chlorobenzene

Samples were extracted and analyzed within holding time limi ts

. Solid % 

### 82608

74-121 80-120 70-130

59-172 62-137 66-142 59-139 60-133

Instrumentation was calibrated in accordance with the method requirements.
The method blanks were free of contamination at the reporting limits. Sample surrogate recoveries met the above stated criteria. RPD %



### 30 30 30 30 30

The associated matrix spikes and /or Labo ratory Control Samples met acceptance criteria.
There were no exceptions in the analyses, unl ess noted.



## eas t e rn analyt ical , inc. www.eailabs.com 

### Aqueous % 

### 82608

86- 115 80-120 70-130

61-145 71-120 76-127 76-125 75-130 RPD

20 20 20 20 20%



### Phone: (603) 228-0525 

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# I fiELD R EADINGS : 

### e aste rn a naly ti c a l, in c. 25 CneNeLL DRtve 1 CoNcoRo

. NH 03301 1 Te L. 603.228.0525 11. 800.287 .052 5 1 FAx 603.228.459 1 1 E-MAtL : cunoMeR_seRvtce@eAtLABs

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