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r � � <br /> Ebb t. <br /> CZMZMM= <br /> Mr James Barton <br /> r June 14, 2004 <br /> Page 6 <br /> Activity to be completed Estimated Start Date Estimated <br /> Completion Date <br /> any VOCs that have volatilized into the vadose <br /> ' zone during operation of the AS system This <br /> will also accelerate bio-stimulation in the <br /> vadose zone <br /> r One month after restart of the AS and SVE September 15, 2004 September 30, 2004 <br /> systems, resample the furthest downgradient <br /> wells (MW-7 and MW-9) and analyze samples <br /> for TPH , BTEX and MtBE <br /> If the analytical results from the re-sampling of September 30, 2004 October 15, 2004 <br /> MW-7 and MW-9 indicate that the benzene <br /> ' concentration is still above detection limits, <br /> conduct additional groundwater investigations <br /> by installing additional monitoring wells further <br /> ' downgradient from MW-7 and MW-9 An <br /> additional well should also be placed between <br /> MW-7 and MW-9 to delineate the extent of <br /> M groundwater impacts in the southeast <br /> direction <br /> ' The activities necessary to restart the remediation system should be completed no later than the <br /> end of the third quarter 2004 to maintain some continuity in the remediation process It is <br /> expected that some additional enhancements will need to be made to optimize the system These <br /> ' alternative remedial methods will be evaluated concurrently with the restart of the existing system <br /> Groundwater Monitoring Well Installation <br /> ' If data continue to indicate additional wells are warranted, the additional well installation <br /> activities will be initiated To assess the downgradient and crossgradient extent of petroleum <br /> ' hydrocarbons constituents in groundwater, ENSR proposes the installation of three <br /> groundwater monitoring wells The locations of the proposed monitoring wells (MW-28, MW-29, <br /> and MW-30) are illustrated on Figure 2. <br /> The groundwater monitoring wells will be advanced using a truck-mounted drill rig employing an <br /> 8 25-inch diameter hollow stem augers The wells will be drilled to an approximate depth of 70 <br /> r feet bgs Soil samples will be collected at five-foot intervals to the total depth drilled using a <br /> split-spoon sampler, fitted with clean brass sample liners Soil samples collected will be field <br /> screened for the presence of volatile organic compounds (VOCs) using a photoionization <br /> r detector (PID) Soil samples will also be logged according to the Unified Soil Classification <br /> System (USCS) visual and manual methods PID readings, USCS descriptions, and other <br /> pertinent drilling information will be recorded on the boring logs Soil samples for chemical <br /> J 1Prolects10694015098-2931FinaRReports15098 Work Pian doc <br /> ' Over 30 Years of Exrelfence in Envnonrnenta!services <br />