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Updated Inn,Conceptual Model and Fourth Quarter 2002 Mon,tormg and Remediation Report Cleanup and Abatement Order No 5-00-707 _ EAT Project No 1232 ' 3.0 GROUND WATER MONITORING On November 27, 2002, 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 December 1 and 3, 2002 The system was reactivated on December 11, 2002 after completion of all monitoring and ' sampling efforts for this reporting period Note GRI personnel were unable to open wells MW- 19S, MW-19D, MW-25S, and MW-25D Therefore, these wells were neither gauged nor sampled during the current sampling event 3.1 Ground Water Sampling On December 1, 2002, 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 (see Table 3) Between December 1 and 3, 2002, 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 3.2 Effluent Handling As requested by Unocal, the purge water and decontammation water generated during sampling activities was transported by GRI to Tosco — San Francisco Area Refinery, located in Rodeo, California (see Appendix A) 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, ETRE, TAME, and EDB by EPA Method 826013, 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 (December 2002) analytical test data for the sites, respectively Appendix C contains the laboratory reports Pursuant to a request from the RWQCB, the laboratory reports list several "tentatively • identified compounds" (TICS) that are not typically reported with 8260B compounds (see BHM WORD 1232Ra2D1 -5- EIMRONMENTAL AUDIT,INC p