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The County of San Joaquin leased the City of Lodi property in <br /> January of 1975 and assumed the operations responsibility for both <br /> landfill areas. By this time, the solid waste was no longer being <br /> incinerated, and a cut and cover operation had been established. <br /> Compaction of the solid waste was achieved using a dozer. Solid <br /> ' waste trenches were excavated to approximately a 50-foot depth with <br /> the excavated material being used for cover. The County planned to <br /> add lifts of solid waste to an average design elevation of about <br /> 120 feet or about 20 feet above the existing ground elevation. <br /> The landfill received solid waste from both public and contract <br /> carriers. The nature of the solid waste was typically domestic <br /> refuse, commercial refuse, tires, construction and demolition <br /> waste. No hazardous wastes were accepted at the landfill. <br /> The last shipment of waste was received at the landfill in <br /> September, 1991. The operators have added soil cover and graded <br /> ' the top of the landfill to 3% to reduce ponding and to improve <br /> drainage on the top of the landfill. <br /> ' III. REGULATIONS <br /> In June, 1990, the California Integrated Waste Management Board <br /> (CIWMB) issued Regulations governing closure and postclosure of <br /> solid waste disposal facilities. These regulations require that a <br /> landfill gas monitoring network be installed at solid waste <br /> landfills. It is further required that the landfill gas be <br /> 4 <br />