Laserfiche WebLink
rainwater drains to a storage tank. Water stored in the tank will be used for soil <br /> moisture control during the treatment process or pumped to the Leachate <br /> evaporation pond. <br /> A monitoring system has been designed to test the soils to ensure the efficiency of <br /> hydrocarbon biodegradation. Soils in the LTUs will be sampled regularly to <br /> evaluate and manage the key treatment parameters such as soil moisture, soil pH, <br /> soil nutrient levels, and air temperature. Following treatment, the soil will be <br /> analyzed to determine if the petroleum hydrocarbon concentration meets the level <br /> acceptable for use as alternative cover or foundation material, or disposal. <br /> Each LTU will have a lysimeter at the low point for leak detection. The lysimeters <br /> monitor moisture in the vadose zone directly beneath the drainage system and are <br /> checked on a quarterly basis. <br /> These treatment units may also be used to treat other nonvolatile organics that are <br /> suitable for bioremediation such as PNAs. <br /> Treatment of Gasoline Contaminated Soil <br /> The "Preliminary Soil Remediation Work Plan, Gasoline Contaminated Soil, <br /> Forward Landfill Unit WMU G, Stockton, California" (Harding Lawson Associates, <br /> July 1991) describes the treatment system for gasoline contaminated soils. The <br /> specifications and reporting requirements of the treatment system are specified in <br /> the WDRs, Order No. 97-141 and in an October 31, 1990, letter from SJCPHS to <br /> Forward. <br /> Although Forward is not currently treating gasoline contaminated soil, these soils <br /> have been treated in the past and may be treated in the future. Gasoline- <br /> contaminated soils will be treated in WMU G-North or G-South by a vapor <br /> extraction and thermal oxidation technique in accordance with San Joaquin <br /> County Uflified-Air Pollution Control District regulations on uncontrolled air <br /> emissions. The vacuum extraction (VE) treatment system will consist of treatment <br /> cells approximately 20 feet wide at the base by 200 feet long and 5 feet high. The <br /> volume of soil in each treatment cell will be approximately 550 cy. The base of <br /> each treatment cell will consist of compacted native soil covered by a 20-mil <br /> polyethylene liner. <br /> Forward Landfill JTD 6-16 <br /> J:\Allied\Forward\JTD Amendment\March 2006 JTD-LEA Resp\ITD\JTD Sec 6 Rev.doc: <br /> 5/22/02;Rev.1:7/2002:Rev.2:4/2003;Rev 3:6/2003;Amendment No.1:5/22/2006 <br />