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Geo(ogicaC7ectiitics Znc. Page 10 <br /> City of Escalon <br /> Project No. 750.3 a <br /> February 26,2001 <br /> 5.2 Monitoring and Laboratory Analysis <br /> Monitoring during the remedial process will satisfy permit conditions and provide valuable <br /> information needed to optimize the vapor extraction system during the remedial process. <br /> Measuring extracted soil vapor.for volatile organic compounds by field instruments and <br /> laboratory analysis is useful in determining hydrocarbon concentrations remaining in the <br /> L <br /> treatment areas and determining when alternative treatment technologies may be <br /> appropriate. Quarterly testing of groundwater by laboratory analysis will also provide <br /> useful information to complement the vapor influent data. <br /> t <br /> Lr 5.2.1 Groundwater Monitoring <br /> Monthly Groundwater Elevation Measurements <br /> The groundwater elevations in all of the monitoring wells will be measured once a month <br /> until a complete annual cycle has been obtained. Thereafter, the groundwater elevation <br /> L measurements will be collected during quarterly groundwater monitoring. This information <br /> will help to evaluate the effect of groundwater mounding in response to vacuum extraction <br /> and possible groundwater level changes as influenced by pumping of City wells in the area. <br /> Quarterly Chemical Testing <br /> The groundwater sample analysis protocol outlined in the work plan for Additional Site <br /> Characterization dated June 29, 2000 will be used during this remedial project. <br /> 5.2.2 Soil Vapor Influent and Emission Monitoring <br /> LIZ) <br /> Weekly Monitoring <br /> Vapor influent and air emissions will. adhere to the AtoC permit and should be monitored <br /> weekly for the first month and twice a month thereafter for the duration of the remedial <br /> project using field instrumentation - PID or FID. The resulting data will be used to optimize <br /> r the.-extraction process and to estimate rates of contaminant removal. <br /> L Monthly Testing <br /> Influent vapor analyses from each vapor extraction well$ shall be accomplished monthly. <br /> The resulting data will be used to optimize the extraction process and to estimate rates of <br /> contaminant removal. <br /> L Field Monitoring <br /> The proposed monitoring schedule is as follows: <br /> 1 • Weekly for the first month with monitoring of the influent and effluent by a hand held <br /> ;Organic Vapor Meter(OVM) & samples for laboratory analysis. <br /> • After the first month, monitoring of influent and effluent by a field portable OVM on a <br /> `twice-monthly basis andLmonthly for laboratory nalvsis. ) <br /> • The samples collected from the influent and effluent ports will be submitted to the <br /> .laboratory for analysis. <br /> Note: This monitoring schedule may be adjusted according to requirements of the <br /> SJVUAPCD permit. <br /> fi <br />