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Mr. Ron Rowe September 4, 1997 Page 5 and laboratory analysis for TPHg, BTEX, and methyl tertiary butyl ether(MTBE). Other analyses may be added to the quarterly events if results from the first sampling event show the presence other fuel additives. 4.0 LABORATORY ANALYSIS Laboratory analyses for the Site-related soil and groundwater samples will generally follow the guidelines listed in the SJCEHD letter dated August 5, 1997. SECOR will submit two to three soil samples from each of the boreholes(wells MW-2 through MW-7)and one groundwater sample from wells MW-1,MW-2 MW-3, MW-4,MW-5,MW-6,MW-7,and VE-1 to a state-certified analytical laboratory for chemical analysis under chain-of-custody documentation. Analytes will include TPHg by modified EPA Method 8015 (modified),and BTEX and MTBE by EPA Method 8020. In addition, two soil samples (lithology dependant) from the proposed well MW-7 will be analyzed for porosity,permeability,bulk density,moisture content,and organic carbon to characterize the general physical properties of the subsurface soils underlying the Site. As requested in the August 5, 1997 SJCEHD letter,one vadose zone soil sample from the proposed well MW-7 will also be analyzed for other fuel additives (such as ethanol,tertiary butanol,MTBE,di isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE),and tertiary amyl methyl ether(TAME)) using EPA method 8260 as requested in the SJCEHD letter. Methanol will also be analyzed for using EPA method 8020. Finally, groundwater samples from MW-6,MW-7, and VE-1, will also be analyzed for other fuel additives as listed above. These wells should provide groundwater samples from different soil units to adequately characterize the potential presence of fuel additives in groundwater beneath the Site. If fuel additives are detected in soil or groundwater samples beneath the Site,the quarterly groundwater monitoring and sampling events will be modified to include the EPA 8260 analysis. Soil cuttings, groundwater, and decontamination wastes will be properly disposed pending completion of laboratory analyses. 5.0 REPORTING SECOR will prepare and submit a Summary Report which documents the procedures and results of the soil and water investigation. The Summary Report will include text,tables,figures,cross sections,and appendices documenting the field activities and the investigation and testing results,as well as integrate existing Site and Site vicinity data. The Summary Report will include hydrocarbon mass estimates (if data permits) and recommendations for additional Site investigative and/or remedial activities,if warranted. Groundwater monitoring reports will be prepared and submitted to the SJCEHD on a quarterly basis. These reports will document groundwater monitoring activities and will include supporting tables, figures, and appendices, as required by the SJCEHD. 6.0 SCHEDULE SECOR is prepared to begin work immediately upon approval of this Work Plan from the SJCEHD. The preliminary field activities will require approximately three weeks to complete. Drilling,soil sampling,well installation,development and sampling will require one week to complete. Laboratory analyses will require WSFFB\STOCKTON\SFFB W KP.RPT