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Mr. Philip Isorena Proposal P93-040.31 <br /> July 12, 1993 <br /> Page 3 <br /> Task 1. Preliminary Activities <br /> EMCON will coordinate with the STTC and facility supervisors to identify acceptable <br /> sampling and testing locations, and will assist the STTC in locating buried utilities <br /> beneath the proposed sampling and testing locations by providing the services of an <br /> underground utility locating firm to the STTC. It shall be the STTC's responsibility to <br /> approve all sampling and testing locations. <br /> EMCON will provide all subcontractors with an updated copy of EMCON's site safety <br /> plan and conduct a health and safety meeting with the project staff and each subcontractor <br /> prior to commencing field operations as required by the site safety plan. <br /> This task also includes scheduling CPT and drilling contractors, mobilizing supplies and <br /> equipment to the site, establishing a staging area, setting up an equipment <br /> decontamination station, and obtaining applicable CPT and well installation permits from <br /> San Joaquin County. <br /> Task 2. Resample B-zone Wells <br /> The seven B-level groundwater monitoring wells (one upgradient and six downgradient) <br /> installed during the interim pollution assessment will be resampled to confirm the results <br /> of previous investigations which indicated elevated levels of petroleum hydrocarbons (59 <br /> to 13,000 micrograms per liter of total petroleum hydrocarbons as gasoline [TPHG]) in <br /> downgradient B-zone monitoring wells (see Figure 1). The seven wells to be resampled <br /> include the upgradient well (PS/MW-I M) and the six downgradient wells (PS/WC-1M, <br /> PS/WC-2M, PS/WC-3M, PS/WC-4M, SP/WC-1M, and TO/WC-IM). <br /> The proposed B-zone wells were resampled during the quarterly monitoring event (second <br /> quarter 1993) and will continue to be sampled as part of the monitoring and reporting <br /> program. The analytical results from the B-Zone wells will be summarized in the second <br /> quarter monitoring report. In addition, the results of the quarterly monitoring event will <br /> be used to determine the final CPTs, HydroPunchs, and monitoring well locations. <br /> Task 3. Migration Pathways <br /> The analysis of migration pathways conducted during the interim pollution assessment <br /> identified several data gaps requiring additional evaluation including (1) disposition of <br /> irrigation well 8R located upgradient of the Time Oil facility, (2) status and location of <br /> three Port of Stockton pipelines, (3) migration pathways on the Santa Fe Pacific Pipeline <br /> SAC/PRUP93\P9304031.bc-93 Imc:S <br />