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1 f <br /> WASTE DISCHARGE REQUIREMENTS <br /> J. R- SIMPLOT COMPANY <br /> LATHROP, SAN JOAQUIN COUNTY <br /> 17. The approved engineered alternatives contain a leachate collection and removalm, a synthetic <br /> mals addressed <br /> drainage layer and vadose zone monitoring and are consistent with the pe g <br /> by the construction and prescriptive standards of Title 27 and will provide equivalent protection <br /> against water quality impairment. <br /> Certification <br /> 18. Kenneth B. King, a registered Civil Engineer, has certified that the engineered alternative described <br /> above will be consistent with the performance goal addressed by the standard, and will provide <br /> equivalent protection against water quality impairment. <br /> DESCRIPTION OF THE SITE <br /> 19. The facility is south of the city of Lathrop in the San Joaquin Valley. The site is underlain by a <br /> complex sequence of interbedded sand, silt, and clay characteristic of the Laguna Formation and <br /> overlying Victor Formation. <br /> 20. There are no known Holocene faults within 1000 feet of the facility. The closest <br /> fault <br /> is Tracy. This <br /> Stockton Arch, which is approximately 10 miles north of the facility near <br /> Stockton fault is pre-Holocene and is stable. <br /> Ground Water Hydrology <br /> 21. The first water bearing zone is approximately 10 feet below the W U& There are four ground <br /> sociated with the WMU's at this site, as shown in Attachment B. <br /> water monitoring wells that are as <br /> There are an additional 63 monitoring wells at and'surrounding the Lathrop facility that are <br /> associated with the remediation of the site under the terms of the Stipulation. Ground water flow <br /> direction is generally to the southwest. <br /> 22. The ground water monitoring network consists of four ground water monitoring wells (LP-1 <br /> t"gh LP-3 and PWI). Background monitor wells indicate that ground water in the area contains <br /> concentrations of TDS ranging from 800 to 1000 milligrams per liter(mg/1). One downgradient <br /> monitor well (LP-1) has recently exhibited concentrations of TDS as high as 12,000 mg/l. <br /> 23. The beneficial uses of the ground water include domestic, municipal, agricultural, and industrial <br /> supply- <br /> Site Hydrology <br /> 24. The mean annual precipitation is 14.3 inches as measured at the Stockton Station (Department of <br /> mi <br /> Water Resources (DWR) bulletin entitled "l inlfallTDepth- annual et evapoorr C aliat this site is <br /> Revised November 1982, updated August ) average <br /> approximately 42 inches. <br />