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" V <br /> V <br /> Task l: Laboratory Evaluation of Soil Samples <br /> During the removal activities performed by TVG and their consultants,SECOR personnel <br /> will retrieve soil samples that we specify for collection from soil volumes removed by <br /> bucket-auger techniques. The number of soil samples and the basis for their collection are <br /> described as follows: <br /> Two samples will be collected from laterally separated and vertically distinct <br /> depths. They will be analyzed for porosity,moisture content, dry bulk density, <br /> specific gravity, and vertical hydraulic conductivity using appropriate ASTM <br /> geotechnical methods, by a certified laboratory. <br /> Two samples will be collected from different soil lithologies at vertically <br /> distinct depths. These soils will be analyzed for total organic carbon content <br /> (TOC) using EPA Method 9000 series. <br /> a Two samples will be collected from different soil lithologies at vertically <br /> distinct depths. These soils will be evaluated by GTEL Laboratories for the <br /> possible presence of hydrocarbon utilizing bacteria. This will involve a bacteria <br /> enumeration study in their laboratory. <br /> The schedule for soils removal activity will be directed by TVG; consequently, TVG will <br /> advise SECOR and PHS/EHD of the initiation of field activities at least two days in advance <br /> of such activity. Once SECOR has retrieved the collected samples and submitted them for <br /> 1 evaluation, laboratory testing will be performed on a standard, turnaround basis of three <br /> weeks following receipt of soil samples. All samples will.be processed under chain of <br /> custody procedures. <br /> Task 2: Perform Fate and Transport Modeling <br /> SECOR will provide a technical review of existing site data and develop a conceptual model <br /> of the site hydrogeologic conditions which may influence contaminant transport and fate in <br /> 1 the subsurface. Based on this conceptual model, SECOR will evaluate the possible threat <br /> to groundwater quality if groundwater levels rise to historic levels described by PHS/BHD. <br /> The following steps will be conducted as part of the technical review and evaluation: <br /> a Review of available soil boring logs from the Site. <br /> a Review of available hydrogeologic cross section depicting the subsurface <br /> conditions. J <br /> a Review of historic groundwater elevation data at the Site and vicinity to evaluate <br /> a seasonal water level and gradient trends. <br /> a Perform modeling of chemical transport.in site soil using SESOIL numerical <br /> code and benzene as the chemical of concern. <br /> PRO/n1132p.pro-5/1/95 <br /> i <br />