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(VYATC ASSOCIATES10 I MC 2.2 Soil Sample Analysis Selected soil samples were kept on ice and delivered under chain-of-custody documentation to State-certified Argon Laboratories Inc (ELAP Cert No 2359) in Ceres, California for chemical analysis Selected soil samples were analyzed by Argon Laboratories for TPHg by EPA method 8015 modified, BTEX by EPA method 8020, methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), tertiary butyl ether (TBA), ethyl tertiary butyl ether (ETBE), di-isopropyl ether (RIPE), 1,2-dichloroethane (1,2-DCA), and ethyl dibromide (EDB) by EPA method 8260, and total lead The analytical results for soil samples are summarized in Table 3 Laboratory data sheets and chain-of-custody documentation are included in Appendix C 2.3 Groundwater Monitoring Well Construction Sod borings MW4, N1W5, MW6, and MW7 were completed as groundwater monitoring wells to assess the lateral extent of hydrocarbon impacted groundwater beneath the site and to provide additional measurement points for the determination of groundwater flow direction and hydraulic gradient The wells were surveyed by Condor Earth Technologies Each well was constructed with 2-inch PVC casing to depths of approximately 55 feet bgs The screened interval of each well was positioned from approximately 35 feet above to 55 feet below ground surface (bgs) to allow for seasonal water level fluctuations The screen slot size is 0 020- inch and the wells were surge blocked to ensure an adequate sand pack was in place Well construction details are depicted on the boring/well logs contained in Appendix B 24 Monitoring Well Development Groundwater monitoring wells MW4, MW5, MW6, and MW7 were developed on December 10, 2003 Each well was purged until the extracted water was relatively sediment free Development logs are included in Appendix D Purgewater was temporarily stored on site in 55-gallon drums 25 Groundwater Sampling and Analysis On July 17, 2003, one groundwater sample was collected from CPT1 from a depth of 78-80 feet bgs The groundwater sample was placed on ice and delivered under chain-of custocTy�� documentation to Argon Laboratories for chemical analysis The groundwater sample was analyzed for TPHg by EPA method 8015 modified, BTEX by EPA method 8021B, and MTBE, TAME, TBA, ETRE, DIPE, 1,2-DCA, and EDB by EPA method 8260B The analytical results for groundwater samples are summarized in Table 2 Laboratory data sheets and chain-of- custody documentation are included in Appendix C On December 1, 2003, a groundwater sample was collected from soil boring SB8 The groundwater sample was placed on ice and delivered under chain-of-custody documentation to Argon Laboratories for chemical analysis The groundwater sample was analyzed for TPHg by S IEnviromenL-i11224931REPORTSLsum3u doe 4