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21 September 1998 <br /> AGE-NC Project No 97-0290 <br /> Page 3 of 8 <br /> 8020, and <br /> • Fuel oxygenates including MTBE, tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPS), <br /> ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether(TAME) by EPA Method <br /> 8260 <br /> Laboratory reports for soil analyses, 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 /> 23 IN-SITU GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> During the soil assessment activities, if hydrocarbon-impacted soil extends to ground water, at Ieast <br /> one "grab" ground water sample will be collected and submitted for laboratory analysis Ground <br /> water sample collection procedures are presented in Section 3 3 <br /> Groundwater samples will be analyzed by a State of California DTSC-certified laboratory for the <br /> following constituents <br /> • TPH-g by EPA Method 8015 Modified/5030, <br /> • BTEX by EPA Method 602, and <br /> • Fuel oxygenates compounds including MTBE, TBA, DIPE, ETBE, and TAME by EPA <br /> Method 8260 <br /> Laboratory reports for ground water analyses,testing methods, laboratory quality assurance/quality <br /> control (QA/QC)reports, and sample chain of custody documentation will be presented in a report <br /> with the findings and recommendations <br /> 2 4 MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> Based upon results of the initial probe boring investigation, ground water monitoring wells will be <br /> installed at the site Proposed locations for the monitoring wells will be submitted to and approved <br /> by the PHS-EHD prior to installation The ground water monitoring wells will consist of 20 feet of <br /> well screen section The well screen section will be installed across the observed water table level <br /> with approximately 15 feet of screen section extending below the ground water table level and five <br />. feet of screen extending above the water table Based on the regional ground water table level, it is <br /> anticipated that the total depth of the monitoring wells will be approximately 50 to 55 feet bsg <br /> Advanced GeoEnvironmental,Inc <br />