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s <br /> Technical Summary & Report of 4TH Qtr Monitoring April 2, 1992 <br /> Diamond Walnut Growers, 1050 South Diamond Street, Stockton, CA W0564 i <br /> of the processing building (Figure 2). All of the vaults were taken out of service and cleaned . <br /> ' in June 1990 (Weiss Associates, April 1991). <br /> ' 2L2 Hydrogeologic Setting <br /> The site is located approximately 2.5 miles east of the San Joaquin River The direction of <br /> tsurface drainage at the,site is controlled by the site topography, which slopes to the south toward <br /> the Mormon Slough. Mormon Slough flows to the west and eventually drains into the San <br /> Joaquin Raver. <br /> Four municipal wells (WP-1 through WP-4) are located at the corners of the site (Figure 2) and <br /> supply water to the plant and to the surrounding community when demand on other sources is <br /> ' high. Only municipal wells WP-1 and WP-3, located in the northeast and southwest corners of <br /> the site, respectively, are currently in use Well WP-2 does not meet turbidity standards and <br /> serves as a back-up for high water demand situations (i e. fire fighting). Well WP-4 is not in <br /> operation and has been scheduled for abandonment (Ed Formosa, City of Stockton, verbal <br /> ' communication, December 1991). <br /> ' Well logs from the State of California Department of Water Resources indicate that the four <br /> municipal wells were installed in 1955 and 1956 to depths between 416 and 491 feet below <br /> ' grade. Wells WP-1 and WP-3 are screened between 260 to 370 feet and 173 to 426 feet below <br /> grade, respectively. The well logs indicate that the wells penetrate almost entirely clay <br /> formations from ground level to approximately 140 feet. <br /> M <br /> ' Water quality data obtained from the City for wells Wp-1 through WP-4 and two analyses of <br /> wells WP-1 and WP-2 performed by Weiss Associates are shown on Table 1 These results <br /> ' indicate the City production wells generally meet all drinking water standards, however, at least <br /> one well (WP2) has had levels of chromium as high as 0 054 milligrams per liter (mg/F) <br /> 8011792 SAY 2 <br /> 1 <br />