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I <br /> PROPOSAL FOR REMEDIATION SERVICES <br /> �= MOBIL SERVICE STATION #10-NP4 <br /> TRACY, CALIFORNIA <br /> I <br /> Task 6 - Operations, Maintenance, -_a_nd Monitoring <br /> For the duration of operation of the groundwater recovery and <br /> treatment system, the site will be visited at least weekly, <br /> and more often during the early months of operation. During <br /> the site visit, the system components will be observed for <br /> proper operation and any needed adjustments will be <br /> performed. Routine maintenance will be performed on the <br /> various system components. <br /> i <br /> Once monthly, a sample will be obtained of the groundwater <br /> pumped and the water from the air stripper effluent. These <br /> samples will be analyzed for BTEX to determine the effect of <br /> the remediation activities on groundwater quality. Soil <br /> samples may be taken on a quarterly basis and analyzed for <br /> BTEX. <br /> The results of this task will be summarized in a monthly <br /> letter to you. <br /> t <br /> COSTS <br /> Estimated costs for the project are summarized in Table 1. i <br /> Assumptions and the basis of these costs are presented on a <br /> task by task basis below. <br /> Task 1 - Additional Information and Preparation of Site <br /> Remediation Work Plan <br /> We propose to perform this work .on a lump sum basis for the <br /> amount shown in Table 1. This cost includes resampling of the <br /> groundwater monitoring wells, percolation test, soil <br /> permeability tests, final design of treatment system, and <br /> development of the Site Remediation Work Plan. <br /> Task 2 -- Excavate and Dispose of Contaminated Soil <br /> We propose to perform this work on a time and expense basis. <br /> The cost shown does not include disposal costs. Hart Crowser <br /> charges are estimated to be -$3 , 000. <br /> -9- <br />