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` <br /> GeologicaITeclutics/rsc. (.WWI Page 5 <br /> Dual Phase Extraction Pilot Test Work Plan <br /> Valentine(Castle Motors) <br /> Project No.764.2 <br /> r September 8,2003 <br /> I.r 2. Groundwater .Extraction Test.- measuring water level drawdown in surrounding <br /> monitoring wells to determine aquifer characteristics for groundwater remediation. <br /> Vapor extraction will continue during this second test. <br /> The existing monitoring wells will also provide observation points to monitor vacuum <br /> influence and draw down in the aquifer. The following wells will be fitted with Solinst <br /> Level Loggers (See Appendix C for details) and vacuum caps: <br /> Well tam: Screen Distance from - <br /> L.� -1 <br /> - <br /> easurements based on map distances. <br /> As stated above, current groundwater levels exceed these wells screens but they will be <br /> monitored regardless in case groundwater drops significantly during the test. <br /> Extracted vapor and groundwater.samples will be collected during the course of extraction <br /> to evaluate the concentration changes through the test period. Influent soil vapor samples <br /> will be collected at the beginning of extraction and at 8-hour increments. Groundwater <br /> samples will be collected prior to start of pumping, immediately after pump startup, and <br /> then at 8-hour intervals. <br /> C2.5 Laboratory Analyses <br /> �+ Air Sample Analysis <br /> .Soil vapor influent samples from EW-1 and system effluent samples will be submitted to <br /> Air Toxics Ltd. of Folsom, California (State Certified Laboratory #02110) for the following <br /> analysis by EPA Method TO-3: <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) <br /> • Gasoline range petroleum hydrocarbons (TPH-Gas) <br /> The detection limits for these compounds are listed below. A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity. <br /> etechonLimits: BTEX TPH-G <br /> ppmv <br /> Groundwater Sample Analysis <br /> Groundwater samples from EW-1 will be submitted to Sherwood Laboratories of Hilmar <br /> (State Certified Laboratory#1400) the following analysis: <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602 <br /> 0 Gasoline range petroleum hydrocarbons (TPH-Gas) by EPA method 5030/8015(m) <br />