## SOIL SAMPLING PLAN
2012 FIVE-YEAR REVIEW
O’CONNOR COMPANY SUPERFUND SITE

AUGUSTA, MAINE June 8, 2012

41 Hutchins Drive Portland, ME 04102 (800) 426-4262
www.woodardcurran.comCMP O’Connor Co. Superfund Site (225545.00) 2 Woodard & Curran

2012 Soil Sampling Plan - DRAFT June 8, 2012 

## INTRODUCTION The purpose of this Soil Sampling Plan is to describe the soil sampling program proposed for the O’Connor Company Superfund Site, to comply with the Remedial Design/Remedial Action 2003 Statement of Work (SOW) which is Appendix II to the Amendment to Consent Decree, September 2003. This Appendix II supersedes Appendix II of the September 3, 1991 Consent Decree, as amended in the 1994 revised SOW (1994 RSOW) following the July 11, 1994 Explanation of Significant Differences (ESD). To comply with the 2003 SOW, the objective of the soil sampling program will be to demonstrate the integrity of the soil cover on the designated area (DA) at five year intervals coincident with each five-year site review. As established in the 1994 ESD, the DA is a portion of the Site that was used to consolidate soil and sediment containing levels between one and ten ppm of PCBs and/or cPAHs, during the Source Control Remedial Action (SCRA). As stated in the September 1998 Final SCRA Report, following the regrading of the site with clean backfill (containing less than or equal to 1 ppm PCBs, 1 ppm cPAHs and 248 ppm lead), the DA was covered with an additional 12 inches of clean fill. In accordance with the 2003 SOW, the boundaries of the DA have been simplified to the 10-sided shape shown in the attached Figure 1. Surveyed permanent markers have been placed at the turning points of the 10-sided DA.



## SAMPLE COLLECTION METHODS In accordance with the 2003 SOW, a total of ten composite soil samples will be collected from randomly selected sample points. A random number generator was used to select 10 sampling locations from a total of 183 grid points that fall within the 10-sided DA and within the area where cover soil was applied in 1997. The locations of the 10 randomly selected soil sampling points are shown in the attached Figure 1. Just prior to collection, the ten randomly selected sample points will be located in the field using a digital global positioning system (DGPS) unit. The sample points will be marked using survey tape or pin flags. If a selected sample location was sampled previously (i.e. during the 2007 five-year review), the sample will be collected at a 2-3 foot offset from the surveyed location (starting in a northerly direction on the grid line and working clockwise to the next grid line if necessary in subsequent years) so as not to sample the exact same location. After the sample locations have been located and marked, collection of the soil samples will proceed using a hand auger, and stainless steel bowls and spoons as sampling equipment. At each sample point, the hand auger and a stainless steel spoon will be used to collect soil from a depth of eight to twelve inches below ground surface. Additional soil will also be collected at depth from four points located within six inches of the original sample point. The soil from all locations around the sample point will be placed in a mixing bowl and thoroughly homogenized using a stainless steel spoon to create one composite sample. A portion of the homogenized composite sample volume will be used to fill a labeled four ounce glass soil jar. A composite soil sample will be collected for each of the sample points resulting in a total of ten samples. All samples will be stored on ice in a cooler during sampling activities and transport to the off-site laboratory. After sample collection, the bowls and spoons will be decontaminated using soap and deionized water. The same identification convention that was used during the SCRA to identify the soil sample locations will be implemented for the 2012 sampling effort. For example, using this system the sample 1066.12CMP O’Connor Co. Superfund Site (225545.00) 3 Woodard & Curran

2012 Soil Sampling Plan - DRAFT June 8, 2012 would indicate a soil sample collected from sample point 1066 in 2012. The suffix “12” differentiates the results from those associated with other samples collected from the same sample point in previous years. 

## QUALITY CONTROL SAMPLES Quality control samples will be collected to identify potential interferences and biases to the reported results. Field quality control samples will include one field duplicate, one matrix spike sample and an equipment blank. The concentrations of the duplicate and the sample will be compared to determine variability and analytical precision. A field duplicate will be identified with a “.51” extension after the sample identification. For example, a field duplicate collected at sample point 1066 would be designated as 1006.12.51. A matrix spike sample will be collected to identify potential biases in the soil matrix that could affect sample concentrations. Matrix spike will be identified with a “.52” after the sample identification. An equipment blank will be collected by pouring deionized water across one of the spoons and into one of the bowls used for homogenizing the sample. The water will then be poured into a one liter glass sample bottle. The blank will be analyzed for PCBs to determine the potential for carry over concentrations from one sample location to the next. The identification of the equipment blank will be EB-100.12.



## ANALYTICAL METHODS/REPORTING LIMITS All soil samples will be submitted to an off-site laboratory for analysis of PCBs using EPA Method 8082. The following Aroclors will be identified during analysis: 1016, 1221, 1232, 1242, 1248, 1254 and 1260. A practical quantitation limit of approximately 0.017 milligrams/kilogram (mg/kg) per Aroclor will be used to ensure consistency with data quality objectives and historic reporting limits. All concentrations will be adjusted for percent solids for a dry weight final concentration.



## REPORTING OF SAMPLE RESULTS The results of the 2012 soil sampling program will be presented as a section in the Five-Year Review Report. The report will identify the sample locations determined in the random selection process, present the final dry weight concentration of total PCBs and compare the PCB concentrations to the SCRA remedial goal of 1 mg/kg.WOODARD

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