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® INFORMATION SHEET COUNTY OF SAN JOAQUIN AND FOOTHILL SANITARY LANDFILL, INC. FOOTHILL SANITARY LANDFILL, MUNICIPAL SOLID WASTE, CLASS III SAN JOAQUIN COUNTY The County of San Joaquin owns and Foothill Sanitary Landfill Inc. operates the Foothill Sanitary Landfill. The facility is a municipal solid waste landfill about 1 mile south of Shelton Road, on the east side of Waverly Road. The facility is comprised of an 800 -acre parcel containing a single Waste Management Unit. This Unit is comprised of two areas: LF -1 and LF -2. LF -1 contains a single, unlined module (referred to as "Module I"), covering approximately 80 acres. LF -2 is comprised of multiple lined modules, the first of which (Module 1) is planned for completion in 2003. Construction of Module 1 of LF -2 is intended to include approximately 35 acres lined module immediately south and adjacent to LF -1. The size of Module 2 and future modules in area LF -2 will be selected by the Discharger in accordance with the refuse disposal rate. Future Module 1 of LF -2 is currently being excavated as part of landfill operations. Soil is being excavated from the area of Module 1, LF -2 for use as daily and intermediate cover on LF -1 until LF -1 is closed in the near future. It is intended that this procedure will be applied to all future modules. This sequence will continue until the entire Unit is filled. The estimated site life for Foothill Sanitary Landfill is approximately 56 years, or the year 2050. ® Land uses within 1,000 feet of the facility are agricultural. There are eight domestic or agricultural groundwater supply wells within one mile of the site. There is one supply well within the permitted boundary of the site, which is used for landfill operational water and domestic use at the on-site caretaker house. Surface drainage is intermittent creeks, with storm waters draining generally in a westerly direction to enter the Delta via either Mormon Slough or Duck Creek, which flow into the San Joaquin River in the Lower Calaveras Hydrologic Area (531.30) of the San Joaquin Hydrologic Basin. _ The landfill is located in northeastern San Joaquin County. The existing and potential designated beneficial uses of surface water, as specified in the Basin Plan, are municipal and domestic supply, agriculture (stock watering and irrigation), industrial (processing and service supply), water contact recreation (REC-1) and non -contact water recreation (REC-2), warm and cold freshwater habitat, warm and cold water migration of aquatic organisms, warm and cold water spawning, wildlife habitat, preservation of rare, threatened and endangered species, and groundwater recharge. The first encountered groundwater is approximately 120 to 150 feet below the native ground surface. The soils immediately underlying the landfill are cemented sandy sit and clay with varied layers of gravel. The Discharger submitted an Evaluation Monitoring Plan, which describes the criteria for delineating the nature and extent of groundwater pollution. Because Module "I" is unlined and assuredly, the source of pollution (VOCs), these WDRs require the closure of Module "I" as part of the corrective action measures. ® KAS:February 6, 2003