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Proposal and Estimated Budget No. <br /> MDT Stockton, CA <br /> Proposal No. P15501.00 <br /> Page 2 <br /> Suspected hydrocarbon impacted soils (up to 1,000 cubic yards) will be excavated by a licensed <br /> California.contractor employing a tracked excavator. <br /> It is estimated that approximately 1000 cubic yard of soil will be removed and stockpiled on <br /> site on 6 mil plastic sheeting. Excavated soils will be field screened with a photoionization <br /> detection meter (PID) calibrated to an isobutylent standard. Clean soils will be stockpiled <br /> separately from the impacted soils based upon field observations such as odor, discoloration, <br /> PID measurements. Stockpiled soils will be covered with plastic sheeting pending results of <br /> laboratory analysis and determination of the appro date remediation/disposal method. <br /> Subsequent to excavation, one soil sample will b collected every 20.linear feet along the <br /> sidewalls of the excavation pit (approximately 6 les) under the direction of the San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/EHD). Two soil samples <br /> will be collected from the floor of the excavation. The soil samples will be submitted to a State- <br /> certified Iaboratory for analysis of benzene, toluene, ethylbenzene and xylenes (BTEX) utilizing <br /> EPA methods 503018020, total petroleum hydros bons as gasoline (TPHG) utilizing EPA <br /> methods 5030/8015 and total petroleum hydrocarboi is as diesel (TPHD) utilizing EPA methods <br /> 355018015. Collection of additional samples may a required by the PHS/EHD. Analytical <br /> costs for samples beyond those proposed above are not included in the cost estimate. <br /> Since groundwater is anticipated in the excavatio pit, dewatering by pumping during the <br /> excavation process may be necessary. Direct disposal into the city sewer system is proposed. <br /> Thus, a water sample will be collected after the pit has been purged of a minimum of one <br /> volume and allowed to refill. The water will bean 3lyzed for BTEX, TPHG and TPHD using <br /> the methods described above. <br /> Task 2, il Pile !Characterization Sam lin <br /> One 2 to i composite sample_will.be collected for very 50 cubic yards of excavated soil for <br /> characterization. Samples will be analyzed for B X, TPHG and TPHD by a State-certified <br /> analytical laboratory. <br /> Task 3. Preparation of Sunmnary Renort <br /> This task includes preparation of a report summarizing all work performed as outlined in tasks <br /> 1 and 2. The report will be prepared for submittal to the PHS/EHD and the California Regional <br /> Water Quality Control Board for their review and approval. The report will detail procedures <br /> P5o1SM <br />