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WASTE DISCHARGE REQUIREMENTS 4 J. R. SIMPLOT COMPANY LATHROP, SAN JOAQUIN COUNTY downgradient monitor well (LP-1) has recently exhibited concentrations of TDS as high as 12,000 mg/1. 24. The beneficial uses of the ground water include domestic, municipal, agricultural, and industrial supply. Site Hydrology 25. The mean annual precipitation is 14.3 inches as measured at the Stockton Station (Department of Water Resources (DWR) bulletin entitled "Rainfall Depth-Duration-Frequency for California" Revised November 1982, updated August 1986). The average annual net evaporation at this site is approximately 42 inches. 26. Based on DWR information the 1000-year, 24-hour precipitation event for the facility is estimated to be 4.1 inches. The 100-year, 24-hour precipitation event for the site is estimated to be 3.25 inches. The 100-year wet season is estimated to be 25.24 inches of rain. 27. Surface water drainage from the site is in the general direction of the San Joaquin River. 28. The beneficial uses of the San Joaquin River and the Delta are municipal, domestic, industrial and agricultural supply; recreation; navigation, aesthetic enjoyment; ground water recharge; and preservation and enhancement of fish, wildlife, and other aquatic resources. Additional beneficial uses of the San Joaquin River include municipal and industrial supply and hydroelectric power generation. 29. The site is not within a 100-year flood plain. DESIGN OF WASTE MANAGEMENT UNITS 30. The Discharger's data demonstrate that the asphalt-lined pond may not prevent the impairment of beneficial uses of ground water from the discharge of non-hazardous solid wastes to this WMU. Therefore, the asphalt-lined pond will be lined with a double liner system consisting of a 40-mil PVC liner overlain by a 45-mil Hypalon liner and approved LCRS 31. The two existing Hypalon-lined ponds will be retrofitted with a new primary liner over the next two years in accordance with the schedule approved by the Board. CERTIFICATION 32. A registered civil engineer or certified engineering geologist will certify that the newly lined ponds meet the construction or prescriptive standards and performance goals, including siting, design of liners, LCRS, precipitation and drainage controls, covers, caps, etc., and considerations of seismic and flood safety of Chapter 15. CEQA CONSIDERATIONS 33. The action to revise WDRs for this site is exempt from the provisions of the California Environmental Quality Act (Public Resources Code Section 21000, et seq.), in accordance with Title 14, CCR, Section 15302.