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C� <br /> 31 January 2000 <br /> AGE-NC Project No 97-0290 <br /> Page 5 of 10 <br /> a State of California Department of Health Services (DHS)-certified laboratory for analysis of the <br /> following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> • Volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) and methyl tert- <br /> butyl ether(MTBE) in accordance with EPA Method 8020 <br /> Laboratory reports for vapor analysis, testing methods, laboratory quality assurance/qualm control <br /> (QA/QC)reports, and sample chain of custody documentation will be presented i uarterly repo <br /> Vapor influent concentrations,vapor effluent concentrations and operational parameters(combustion <br /> temperature, volume of processed vapor, oxygen level and the lower explosive limits (%LEL) will <br /> be monitored on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors and <br /> to monitor cleanup progress <br />• The SVE/IAS system will be maintained on a weekly basis according to manufacturers <br /> recommendations (i e lubrication, oil changing, system adjustments, etc ) <br /> Quarterly ground water monitoring and sampling will be performed at the site throughout the <br /> remediation period to monitor remedial progress Depth to ground water and dissolved oxygen <br /> measurements will be collected on a monthly basis to determine if ground water mounding is <br /> occurring as a result of the IAS system <br /> 3 6 PROGRESS/CONFIRMATION SAMPLING <br /> After approximately eight months of operation or efficiency of the SVE unit has declined, soil <br /> samples will be collected from the "core" petroleum hydrocarbon impacted area at the site <br /> Analytical results of soil samples will serve to approximate remaining petroleum hydrocarbon levels <br /> and to determine if continuing remedial operation is necessary <br /> Soil samples will be analyzed by a State of California Department of Health Services (DHS)- <br /> certified laboratory for the following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) in accordance with EPA Method 8015 Modified/5030, and <br /> • Volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) and methyl tert- <br /> butyl ether(MTBE) in accordance with EPA Method 8020 <br /> Advanced GeoEnvironmental,Inc <br />