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Updated Site Conceptual Model and First Quarter 2002 Monitoring and Remediation Report Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 • 3.0 GROUND WATER MONITORING All ground water monitoring and sampling activities were completed by Gettler-Ryan, Inc between March 3 and 5, 2002 On February 27, 2002, the remediation system was deactivated to allow ground water to stabilize before initiating gauging and sampling activities The system was reactivated on March 7, 2002 after completion of all monitoring and sampling efforts for this reporting period 31 Ground Water Sampling ' On March 3, 2002, prior to purging or sampling activities, depth measurements to fluid levels were obtained by Gettler-Ryan, Inc (GRI) from all monitoring wells associated with the Wards and Unocal (MW-1 through MW-27) sites Depth measurements were obtained using an ' interface probe accurate to 0 01 foot No free-product was detected in any of the wells The water level measurement for each well was converted to mean sea level (MSL) datum by subtracting the measured water level for each well from its respective "top of well casing elevation" datum (see Table 6) Between March 3 and 5, 2002 ground water samples were collected from the wells by GRT for analytical testing Standard operating procedures used by GRI for ground water monitoring are contained an Appendix B Appendix C contains the GRI ground water monitoring field logs, and Appendix D the chain of custody records 32 Effluent Handling As requested by Unocal, the purge water and decontamination water generated during sampling activities was transported by GRI to Tosco -- San Francisco Area Refinery, located in Rodeo, California (see Appendix B) 3.3 Analytical Testing The samples were delivered for analytical testing to Sequoia Analytical in San Carlos, California a state certified hazardous waste testing laboratory (Certificate No 2360). Sequoia Analytical is certified for all tests completed as part of this investigation The samples were analyzed for VOCs, including fuel oxygenates, e g , MTBE TBA DIPE , ETBE, TAME, and EDB by EPA Method 8260B, and TPH-G by modified EPA Method 8015 Pursuant to discussions with the RWQCB, the samples were not tested for ethanol or methanol Tables 1 and 7 present the historic and current (March 2002) analytical test data for the sites, respectively Appendix D contains the laboratory reports BHM 1212RO231 -6- ENVIRONMENTAL AUDIT,INC