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19 December 2003 <br /> AGE-NC Project No. 95-0128 <br /> Page 8of12 <br /> be monitored on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors and <br /> to monitor cleanup progress. <br /> The SVE system will be maintained on a weekly basis according to manufacturers recommendations <br /> (i.e. lubrication, oil changing, system adjustments, etc.). <br /> Quarterly ground water monitoring and sampling will be performed at the site(MW-I through MW- <br /> 18) throughout the remediation period to monitor remedial progress. Depth to ground water <br /> measurements will be collected on a monthly basis to determine if ground water mounding is <br /> occurring as a result of the SVE system. <br /> 3.6. PROGRESS/CONFIRMATION SAMPLING <br /> After approximately 12 months of operation or efficiency of the SVE unit has declined,soil samples <br /> will be collected from the"core"area of petroleum hydrocarbon impacts at the site.Analytical results <br /> of soil samples will serve to approximate remaining petroleum hydrocarbon levels and to determine <br /> if continuing remedial operation is necessary. <br /> Soil samples will be analyzed bya State of California Department of Health Services(DHS)-certified <br /> 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; <br /> • Volatile aromatics(benzene,toluene,ethyl benzene and xylenes:BTEX)and methyl tert-butyl <br /> ether(MTBE) in accordance with EPA Method 8020; and <br /> • Fuel oxygenates including MTBE, tertiary-butyl alcohol(TBA),di-isopropyl ether(RIPE), <br /> ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether(TAME) by EPA Method <br /> 8260. <br /> Laboratory reports for soil analysis, testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations. <br /> 4.0. PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Registered Geologist.Procedures for SVE and ground water extraction well installation,underground <br /> Advanced GcoEnvironmental,Inc. <br />