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GEOMATRIX <br /> water well construction ordinances require relatively deep sanitary seals that <br /> isolate these shallow groundwaters from the production zone(i.e.,well <br /> construction standards for San Joaquin County require a minimum of 100 feet of <br /> grout seal for wells installed as a drinking water supply). Additionally, the site <br /> is within the city limits of Tracy and the Tracy municipal code does not allow <br /> for the legal installation of a new drinking water supply well or the further use of <br /> an existing drinking water supply well by private parties within the city limits <br /> and within 200 feet of connection to a city water main. Therefore, there are no <br /> plausible threats to the future beneficial use of the shallow groundwater beneath <br /> the site posed by the residual petroleum. <br /> Based on the favorable comparison to the"Criteria for Low Risk Ground Water Designation" <br /> as outlined in the RWQCB's Appendix B,the management strategy recommended is closure. <br /> Accordingly,we recommend that this site be closed by the regulatory agency. <br /> ' \\sl9\deptdate\Doc_Safe\4780.01klanpt.dM 8 <br />