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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 for Soil Boring 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 /> 0-46 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, 0-13, 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 Soil sample data had one of the highest concentrations of <br /> BTX and elevated concentrations of diesel and gasoline <br /> (5.03, 210 and 56 mg/kg, respectively) . <br /> D-13 Soil sample data had one of highest concentrations of BTX <br /> and elevated concentrations of diesel (4.22 and 1800 mg/kg, <br /> respectively) . <br /> 0-26 Soil sample data had the highest concentrations of diesel , <br /> gasoline and BTX (29,000, 1900 and 127.90 mg/kg, <br /> respectively) . <br /> D-34 Soil sample data had very high concentrations of diesel and <br /> high concentrations of BTX (22,000 and 1.36 mg/kg, <br /> respectively) . <br />