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Work Plan for Refined Plume Definition and Management of Floating Product-7500 W 11th St., Tracy, CA, Page 79 <br /> ,. laboratory methods for the detection and quantification of TPH in soil and <br /> groundwater(Zemo 1997a). <br /> By October 2003, samples had been recovered from Monitoring Wells MW-3A, MW-3B and <br /> MW-12A on at least 5 occasions (6 for MW-3A) over a period of 1.5 years, during which <br /> time no analytes of concern were detected in any of the three wells (see Table 2). <br /> Accordingly, to eliminate the continuing risk that the deeper aquifers beneath th <br /> p q e site may <br /> become contaminated via those monitoring wells and to save the unnecessary disbursements <br /> of funds from the USTCF, SJC wishes to restate its strong recommendation that those wells <br /> be closed. The proposed closures can be cost-effectively implemented if they are scheduled <br /> at the same time that the proposed groundwater-quality and floating product monitoring wells <br /> described in Sections 7.0 and 8.0 are installed. <br /> 10.2.1 Schedule <br /> u As noted above, the existing monitoring walls will be closed during the same construction <br /> _ period as the proposed new groundwater-quality and floating product monitoring wells will <br /> be installed. That schedule is presented in Section 7.9. <br /> 10.2.2 Cost Estimate <br /> The estimated cost of closing selected existing groundwater quality wells is included in the <br /> budget presented in Section 14.1. <br /> SJC <br />