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KEI-P88-077 <br /> July 26, 1988 <br /> Page 4 <br /> SOIL AERATION AND DISPOSAL: <br /> Samples of the stockpiled soil on the site will be obtained and <br /> analyzed for TPH to evaluate the concentrations and the need for <br /> aeration or other treatment prior to disposal. One composite <br /> soil sample will be collected from every 50 cubic yards of <br /> stockpile in order to document hydrocarbon concentrations in the <br /> soil and to obtain approval from the San Joaquin Air Quality <br /> Management District for aeration. Each composite sample will be <br /> consited of four grab samples taken from various locations and <br /> composited onto one. <br /> � Composite samples will be tested for TPH using EPA methods. if <br /> the TPH concentrations are not detectable (less than 10 ppm) , the <br /> ✓ soil will be considered acceptable or unres ric <br /> I a use on or <br /> off-site. If the concentrations of TPH are less than 100 but <br /> greater than 10 ppm, the soil will be segregated for later <br /> hauling to a Class III landfill or, possibly, aeration. If <br /> concentrations are greater than 100 ppm, the soil will be <br /> aerated, using the aeration procedures in accordance with the Air <br /> Board, to reduce the concentrations below this value. After <br /> aeration, if performed, additional soil samples will be obtained <br /> (one composite sample for each 50 cubic yards selected using the <br /> vapor screening method described in the previous paragraph) and <br /> analyzed to confirm that the TPH concentrations are less than 100 <br /> ppm. Aerated soil will be hauled to a Class III landfill unless <br /> the TPH concentrations are less than 10 ppm, in which case their <br /> disposal or reuse will be unrestricted. Approval will be <br /> obtained from the RWQCB for disposal to an approved Class III <br /> landfill. County HEalth and Department of Health Services will <br /> also be notified for a permit to stockpile contaminated soil that <br /> exceeds 1000 ppm TPH. <br /> II. GROUNDWATER REMEDIATION <br /> * Assess the background quality of the shallow groundwater <br /> aquifer in the project site vicinity. <br /> * Install two additional wells (MW-7 and MW-8) as shown on the <br /> attached site plan. <br /> * Sample and analyze all existing wells and the proposed new <br /> wells for TPH, BTEX and chlorinated hydrocarbons. <br />