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'4 T4'• -r-;y - � - - ^�•.x, __`�.. .sem!'_-r- <br /> ta� <br /> i� <br /> f <br /> adjacent verifiable gradient is not available. <br /> The <br /> groundwater data produced by the San Joaquin Flood Control <br /> District is not acceptable to the Health Department. Our <br /> experience has shown that this data is adequate for locating <br /> preliminary wells. <br /> WaterWork believes that installing three wells on the site <br /> is excessive due extensive excavation and the laboratory <br /> results from wall and floor samples indicating no detectable <br /> contamination. We .recommended that one monitoring well be <br /> installed in the area of the excavation where the highest <br /> concentrations were detected (Figure 6) , The well would be <br /> installed to a depth of about 60 feet and completed as shown <br /> in Figure 7. Soil samples would be collected at five foot <br /> intervals beginning at 30 feet below grade and continuing to <br /> the water table; Selected samples would be analyzed for <br /> BTEX and TPHG. After installation of the well, the well <br /> would be developed and a water sample collected to be <br /> analyzed for BTEX and TPHG in accordance with Waterldork's <br /> Quality Assurance/Quality Control Plan (Appendix 111) . <br /> xf.-significant. groundwater contamination exzsts beneath the <br /> site, it should be observable .in <br /> . the well as. proposed: T£:. < <br /> contamination is observed, the two additional mantoring <br /> wells would be installed to more accurately establish the, <br /> local gradient. <br /> 4.0 REFERENCE <br /> Page, R.W. , 1986, Geology of the Fresh Groundwater Basin of <br /> the Central Valley California with Restore Maps and <br /> Section: U.S. Geological Survey Professional Paper, 1401- <br /> C, 54 p. <br /> �. 4 <br />