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Work Plan for UGT Investigations -4- 7 November 1991 <br />DDRW, Sharpe Site <br />Based on my conversations with Mr. Craig MacPhee, part of the rationale <br />for boring placement was to investigate the tanks that contained wastes <br />other than fuels, such as the tanks that contained waste oils. Based on <br />this criteria, two other tank sites should have had soils borings <br />installed. These tank sites and the rationale for installation of a soils <br />boring are listed below: <br />Tank Site Rationale forSoilBoring Placement <br />D-29 This tank contained waste solvents. Analytical results of <br />soil sample, as listed in Table 2-2, show that there were <br />elevated concentrations (15 mg/kg) of polychlorinated <br />biphenyls (PCBs) as well as elevated concentrations of TPH <br />and BTX's. <br />D-46 This tank contained waste solvents. Elevated <br />concentrations of trichloroethylene (TCE) (100 to 500 <br />micrograms per liter) based on soils gas data, were found <br />in the area of this tank, as reported in the Remedial <br />Investigation (RI) Report. <br />Page 2-10. Table 2-5 lists those tank sites where additional monitor wells should be <br />installed. Generally, a monitor well should not be installed at a tank <br />site if the soils data indicate that ground water has not been impacted. <br />In addition, existing down gradient monitor wells (provided the wells are <br />reasonably close to the tank sites) could be sampled and analyzed for TPH <br />and BTX to determine if ground water may have been impacted. <br />Six monitor wells are proposed to be installed at the following tank <br />sites: D-12, D-15, D-13, D-19, D-42 and D-44. However, I do not concur <br />with the selection of all of the tanks slated for well installation. <br />Based on the data presented in Table 2-5, the tank sites listed below <br />should have wells installed. The rationale for well installation is also <br />listed. <br />Tank Site ' Rationale for Well Installation <br />D-5 <br />Soil sample data had one <br />of the highest concentrations of <br />BTX and elevated concentrations <br />of diesel and gasoline <br />(5.03, 210 and 56 mg/kg, <br />respectively). <br />D-13 <br />Soil sample data had one <br />of highest concentrations of BTX <br />and elevated concentrations <br />of diesel (4.22 and 1800 mg/kg, <br />respectively). <br />0-26 <br />Soil sample data had the <br />highest concentrations of diesel, <br />gasoline and BTX (29,000, 1900 and 127.90 mg/kg, <br />respectively). <br />D-34 <br />Soil sample data had very <br />high concentrations of diesel and <br />high concentrations of <br />BTX (22,000 and 1.36 mg/kg, <br />respectively). <br />