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i <br /> tj <br /> _ precedent. Institutional acceptability includes local soil cleanup policies <br /> and other agency goals which may .have the force of regulation. For example, <br /> the local health department may require all spill sites .be cleaned up to a <br /> certain level regardless of potential community impact. Cleanup levels from <br /> fuel tank leaks in California are likely to be set by regulatory personnel <br /> relying on the LUFT Manual. The LUFT Manual contains a range of suggested <br /> cleanup levels for diesel spills ranging from 140 to 10,000 ppm TPH diesel, <br /> depending on site conditions. <br /> In addition to evaluating remedial objectives in terms of soil <br /> concentrations, Dames & Moore estimated the amount of diesel which would <br /> effectively be removed by. implementing various cleanup alternatives. Table <br /> 4-3 summarizes the results of. this evaluation. As shown in Table 4-3, <br /> excavation of all soils containing greater than. l0 000 m TPH will achieve <br /> the removal of 46 percent of the diesel fuel leaked. ,soils remaining <br /> following excavation to 10,000 ppm will have an averages concentration of <br /> 2100 Rpm. Removal of all soils containing greater than 1000 ppm TPH will <br /> .1 <br /> 4 effectively remove 95 percent of the diesel fuel, however the costs are <br /> l increased by a factor of four. <br /> Dames & Moore proposes a site cleanup level of 10,000 ppm TPH in soils <br /> based on the following: <br /> • This cleanup level is well below the calculated maximum allowable <br /> concentration based on the health assessment: <br /> • Achieves removal of approximately 50 percent of leaked diesel fuel; <br /> and <br /> • Establishes a cleanup level with regulatory precedent. <br /> f <br /> 4-11 <br /> GGA/0179b <br />