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soil nutrient levels, and air temperature. Following treatment, the soil will be analyzed to determine if the petroleum hydrocarbon concentration meets the level acceptable for use as alternative cover or foundation material, or disposal. Each LTU will have a lysimeter at the low point for leak detection. The lysimeters monitor moisture in the vadose zone directly beneath the drainage system and are checked on a quarterly basis. These treatment units may also be used to treat other nonvolatile organics that are suitable for bioremediation such as PNAs. Treatment of Gasoline Contaminated Soil The "Preliminary Soil Remediation Work Plan, Gasoline Contaminated Soil, Forward Landfill Unit WMU G, Stockton, California" (Harding Lawson Associates, July 1991) describes the treatment system for gasoline contaminated soils. The specifications and reporting requirements of the treatment system are specified in the WDRs, Order No. 97-141 and in an October 31, 1990, letter from SJCPHS to Forward. Although Forward is not currently treating gasoline contaminated soil, these soils have been treated in the past and may be treated in the future. Gasoline- contaminated soils will be treated in WMU G-North or G-South by a vapor extraction and thermal oxidation technique in accordance with San Joaquin County Unified Air Pollution Control District regulations on uncontrolled air emissions. The vacuum extraction (VE) treatment system will consist of treatment cells approximately 20 feet wide at the base by 200 feet long and 5 feet high. The volume of soil in each treatment cell will be approximately 550 cy. The base of each treatment cell will consist of compacted native soil covered by a 20-mil polyethylene liner. Forward Landfill JTD 6-16 J:\Allied\ForwardUTD Amendment\Final JTD Amendment\JTD Rev Sec 6 080105.doc:5/22/02 Rev. 1:7/2002:Rev.2:4/2003;Rev 3:6/2003 Amendment No. 1:8/1/2005