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. Larnmersvdle School District March 3, 1992 <br /> 02320 2124 Page 5 <br /> 6 0 CONCLUSION <br /> Soil and groundwater in the vicinity of the two new groundwater monitoring wells, MW-9 and MW-10, <br /> have not been impacted by gasoline hydrocarbons Laboratory analyses of groundwater samples <br /> indicate that only MW-2 and MW-6 contain dissolved TPH-G, and that only MW-6 contains dissolved <br /> benzene <br /> The water table elevation has decreased by approximately 2 feet since the August 27, 1991 <br /> monitoring event The groundwater has consistently been measured flowing to the north, under an <br /> average hydraulic gradient of 0 01 <br /> 7 0 RECOMMENDATIONS <br /> Groundwater Technology recommends performing feasibility studies to determine the best remedial <br /> approach for the site Initially, a step drawdown aquifer test should be performed on MW-1 or MW-6 <br /> to determine the hydraulic properties of the water bearing soils Secondly, a vapor extraction test <br /> should be performed to evaluate the feasibility of soil venting After these steps have been completed, <br /> than a draft remedial action plan SDRAP) can be developed for submission to the SJCEHD, and the <br /> CRWQCB Quarterly monitoring and sampling shall continue The next event will be conducted on or <br /> around April 24, 1992 <br /> 21240SR1 RPT i�C" <br /> � GROUNDWATER <br /> TECHNOLOGY <br />