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' Updated Site Conceptual Model and Second Quarter 2003 Monitonng and Remediation Report Cleanuanand Abatement Order No 5-00-707 EAI Project No 1232 3.0 GROUND WATER MONITORING On April 29, 2003, the remediation system was deactivated to allow ground water to stabilize before initiating gauging and sampling activities All ground water monitoring and sampling activities were completed by Gettler-Ryan, Inc between May 4 and 6, 2003 The system was reactivated on May 6, 2003 after completion of all monitoring and sampling efforts for this reporting period 3.1 Ground Water Sampling i On May 4, 2003, prior to purging or sampling activities, depth measurements to fluid levels were obtained by 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 (Table 3) Between May 4 and 6, 2003, ground water samples were collected from the wells by GRI for analytical testing Standard operating procedures used by GRI for ground water monitoring are contained in Appendix A Appendix B contains the GRI ground water monitoring field logs, and Appendix C the chain of custody records and laboratory reports 3.2 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 (Appendix A) 3.3 Analytical Testing The samples were dclivered 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, DIPS, 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 4 present the historic and current (May 2003) analytical test data for the sites respectively Pursuant to a request from the RWQCB, the laboratory reports list several "tentatively identified compounds" (TICS) that are not typically reported with 8260B compounds (Appendix C) The laboratory has informed EAI that TICS have not been compared to a standard but are listed simply as "tentatively identified" Therefore, these compounds are not listed in either Table 1 or 4 sHM WORD 1232RO351 -5- ENVIRONMENTAL AUDIT, INC