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1 <br /> CAMBRIA. <br /> I� <br /> Mr. Ron Rowe <br /> August 20, 1999 j <br /> One soil sample from each distinct lithologic unit across the site that has not been previously <br /> encountered will be preserved for physical analyses. For each sample that will be used for <br /> physical analyses, Cambria will attempt to preserve two brass tubes, each 6 inches in length by <br /> 2 inches in diameter. Soil observed to contain hydrocarbons will not be used for physical <br /> analyses. <br /> Chemical Analysis: The soil samples will be analyzed for TPHg, benzene, toluene, ethyl <br /> benzene, and xylenes, (BTEX) by EPA Methods 8015/8020 at a California certified laboratory. <br /> The samples will also be analyzed for oxygenated fuel additives Methyl tert-Butyl Ether <br /> (MTBE), Tertiary Amyl Methyl Ether (TAME), di-Isopropyl Ether (DIPE), Ethyl tert-Butyl <br /> Ether (ETRE),.tert-Butanol, and ethanol using EPA Method 8260. Methanol will be analyzed <br /> by EPA Method 8015 (modified). Proposed detection limits for the oxygenated fuel chemical <br /> compounds in soil are as follows: MTBE - 0.1 mg/kg, TAME - 0.1 mg/kg, DIPE - 0.1 mg/kg, <br /> i <br /> ETBE-0.1 mg/kg, tett-Butanol -5.0 mg/kg, ethanol—25 mg/kg, and methanol - 1.0 mg/kg. <br /> REMEDIAL SYSTEM INSTALLATION <br /> Extraction Well Design: Existing, 4-inch monitoring well (well EW-1) will be converted to a <br /> ground water extraction well. <br /> Ground Water Extraction System Design: The proposed GWE system will pump ground water <br /> from existing extraction well EW-1 to a treatment compound. The proposed treatment method <br /> for the extracted ground -water will.be granular activated carbon. The treated water will be <br /> discharged to the sanitary sewer. The proposed well locations and GWE system design are <br /> shown in Figure 2. <br /> Underground piping will transmit pumped water from the wells to the treatment area, and <br /> transmit treated water from the treatment-area to the sanitary sewer. Utility trench locations are <br /> shown in Figure 2. Additional piping and electrical conduits will be installed to enable <br /> i <br /> additional wells to be connected to the system if needed in the future. <br /> Carbon adsorption vessels and associated equipment will be located within the treatment area. <br /> Electrical submersible pumps will be used to extract the ground water and pump it to a transfer <br /> tank. A transfer pump will move the water through the filter vessels. A new temporary <br /> electrical service will be installed to serve the remediation system. <br /> 3 <br />