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SAN JOAQUIN COUNTY FOOTHILL SANITARY LANDFILL LANDFILLCLASS III Foothill Sanitary Landfill is in San Joaquin County approximately 1 -mile south of Shelton Road, on the east side of Waverly Road. The 800 -acre site is owned and operated by the San Joaquin County Department of Public Works. Waste disposal activities have occurred within LF -1. To date approximately 80 acres have been filled and LF -1 is estimated to reach capacity in 1999. LF -2 will be developed into 29 distinct but continuous modules, as shown in Attachment B which is incorporated herein and made part of this Order. The first lined module is currently being excavated, and the soil is being used for daily and intermediate cover on the existing landfill area. When the lined module is being filled, the next module will be excavated, and the soil will ge used for daily and final cover. This sequence will continue until the entire site is filled. The estimated site life for Foothill Sanitary Landfill is approximately 68 years. Land within 1000 feet of the facility is used for agriculture. The beneficial uses of groundwater are domestic, municipal, agricultural, and industrial supply. Surface drainage from the site is to the Delta via either Mormon Slough or Duck Creek. The beneficial uses of these surface waters are domestic, municipal, agricultural, and industrial supply; ground water recharge; recreation; stock watering; aesthetic enjoyment; fresh water replenishment and habitat; spawning; wildlife habitat; and the preservation and enhancement of fish, wildlife and other aquatic resources. The first water bearing formation is about 100 feet below the base of the landfill. The soils immediately underlying the landfill are cemented sandy silt and clay with varied layers of gravel. Waste Discharge Requirements are being updated to consolidate amendments (Board Order 93-200) made to previous WDR Order 91-020 and to recognize San Joaquin County's submission of a proposed monitoring program, which complies with Article 5 of Chapter 15. The new monitoring program combines the County's Article 5 monitoring proposal and RCRA Subtitle D monitoring requirements. Also included in the updated WDRs are composite liner requirements from Order 93-200, which required that any expansion of the landfill footprint after 9 October 1993, will be on a composite liner.