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Waste trenches were excavated to approximately a 50-foot depth with the excavated material being used for cover. Records do not identify the exact location and depth of the early trenches. HLSL received domestic refuse, construction debris, and agricultural wastes. The landfill received solid waste from both public and contract carriers. The nature of the solid waste was typically domestic refuse, commercial refuse, tires, construction and demolition waste. In 1987, City of Lodi transferred full ownership of the Harney Lane Landfill to the County. HLSL stopped receiving waste in 1991. 2.2 CLOSURE In , 1 94 HLSL was certified closed in accordance with CCR Title 14. Closure 9 construction included the installation of the closure cap, Landfill gas (LFG) migration monitoring wells and groundwater monitoring wells. The cap consists of a 2- to 6-foot foundation layer under a 1-foot minimum thick, low -permeability soil layer, with a 1-foot thick vegetative surface layer. Since closure in 1994, HLSL has been in postclosure maintenance regulated under solid waste Facility permit number 39-AA-003, issued by San Joaquin County Environmental Health Department (EHD) as Local Enforcement Agent for the California Integrated Waste Management Board, and under Waste Discharge Requirements (WDRs) issued by Regional Water Quality Control Board (RWQCB). The topography surrounding the landfill varies from approximately 95 to 115 feet above mean sea level (Figure 2). Landfill surface grades are a maximum elevation of 142 feet above msl at the center of the landfill. Top deck slopes of both primary and secondary sites are graded with an elongated (north/south oriented ) central crest with slope of 3 to 4%. The side slopes of both the primary and secondary sites are between 2:1 and 3:1 horizontal to vertical. A storm water detention basin is located south of the primary site (Figure 2). The soil excavated from this basin, and from the borrow area south of the secondary site was used for cover material for the landfill during its operation and closure. The borrow area continues to provide borrow soil for landfill final cover, drainage maintenance, and other uses. Runoff from the top decks of both the primary and secondary site is directed via perimeter berms to corrugated metal down drains. Unlined perimeter ditches around the landfill capture and carry the discharge to the storm water detention basin (Figure 4). The detention basin is designed to accommodate landfill's drainage and flood overflow from South Paddy Creek that may occur during Postclosure Maintenance Plan San Joaquin County Harney Lane Sanitary Landfill 2 Department of Public Works Revised July 30,2009 Solid Waste Division