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Mr. Richard Callistro September 21, .1994 <br /> San Joaquin County Capital Projects Page 4 <br /> Groundwater Sampling <br /> After completion and development of the two new wells, one round of groundwater sampling <br /> of all wells in the HSA building well field (MW-2A, MW-3A, MW-4, MW-5, MW-6, MW-7, <br /> MW-8) will be completed, a total of seven wells. One blind duplicate and one field <br /> decontamination check sample will also be taken as quality control measures. All nine water <br /> samples will be submitted for BTEX analysis by EPA Method 602 and TPH-G analysis by EPA <br /> Method 8015-M, the same analytical suite as utilized in previous site monitoring. <br /> Report Development <br /> All data generated by the site investigation activities described above will be presented in a final <br /> report. The focus of the report will be toward making a final evaluation of whether or not the <br /> HSA site is contributing to groundwater quality problems in the area of the site. As noted in <br /> the EHD letter of March 14, 1994, three other UST sites are near the HSA site. As part of <br /> preparing the report of this investigation's data, WESTON will review EHD files for these <br /> projects and incorporate any data found relevant to the HSA project. This approach adopts a <br /> larger view of the vicinity of the HSA building than utilized in past reports and may assist to <br /> place the HSA site data in context with more regional concerns in the downtown Stockton area. <br /> Optional Well Abandonment <br /> Because of the drop in the regional water table, existing wells MW-2 and MW-3 are unlikely <br /> to ever contribute further information to the project. Therefore, it is recommended that MW-2 <br /> and MW-3 be properly abandoned by pressure grouting to eliminate any future liabilities. While <br /> abandonment at this time is not absolutely required, doing so while the drilling firm is onsite for <br /> the MW-2A and MW-3A monitor well installation will save costs. As this is an optional <br /> activity, a quotation for the task is presented separately in the budget quotation section below. <br /> Cost Ouotation <br /> To complete the work discussed above, the following budget is proposed: <br /> Investigation, Monitoring and Reporting Tasks <br /> Labor <br /> Senior Technical $ 1,694 <br /> Technical 8,294 <br /> Support 700 <br /> Total Labor $10,688 <br /> MTROPOSALWROMP ` <br /> 1 �� <br />