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1.0 BACKGROUND <br /> 1.1 GENERAL <br /> Harney Lane Sanitary Landfill (HLSL) is a closed, unlined Class III landfill located <br /> at 14750 E Harney Lane in Lodi California. The landfill covers approximately 127 <br /> acres, of which 112 acres were used for waste disposal and was divided into two <br /> fill sections, a primary and secondary site. The remaining area is comprised of <br /> access roads, storm water retention ponds, setbacks for environmental <br /> monitoring, and firebreaks. Land within 1,000 feet of the facility is used for <br /> grazing, agriculture and low-density residential housing. <br /> The landfill received approximately 125,000 tons of waste annually until 1991, <br /> generally residential and commercial refuse, construction debris and agricultural <br /> waste. In 1994, HLSL was certified closed in accordance with Title 14. Closure <br /> included the installation of the closure cap, landfill gas (LFG) migration monitoring <br /> wells and groundwater monitoring wells. <br /> Since closure, HLSL is under postclosure maintenance and maintained by San <br /> Joaquin County Public Works Solid Waste Division (SWD). The postclosure land <br /> use of the site is open grazing space. <br /> 1.2 LFG COLLECTION AND CONTROLLED SYSTEM <br /> A LFG collection and controlled system (LFGCCS) was installed in 1996 to control <br /> subsurface Landfill Gas (LFG) migration and to mitigate groundwater impact <br /> (Figure C-1). The LFG system includes a flare station containing a flare, blowers, <br /> and controls. Vacuum produced by these blowers collect LFG from 80 LFG <br /> extraction wells of varying depths in refuse. Each well is provided with an <br /> adjustment valve and sampling port. The flow rate from each extraction well is <br /> adjusted based on the concentration of methane in the gas collected at the well. <br /> The LFG flare is operated in accordance with Permit to Operate Number N-3303- <br /> 1-1 issued by the San Joaquin Valley Air Pollution Control District (SJVAPCD) <br /> (Attached). <br /> LFG is typically 55% methane at the point of production within the landfill, with the <br /> balance primarily carbon dioxide with small concentrations of non-methane <br /> organic compounds. However, collection of LFG can cause air to intrude into the <br /> landfill, diluting the methane. This is the case at HLSL, where excessive vacuum <br /> is applied to control off-site migration. As of March 2007, the methane content in <br /> gas collected from HLSL's LFG system is approximately 30%. <br /> Harney Lane Sanitary Landfill San Joaquin County <br /> LFG O&M Plan C-1 Department Of Public Works <br /> Solid Waste Division <br />