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LOF GlassWoodward-Clyde Consultants <br /> May 6, 1985 <br /> Page 6 <br /> around the leak site. We agree with recommendations made by Gary Reents <br /> of the Regional Water Quality Control Board during a telephone <br /> conversation with Ron Quick of LOF that the excavated material be mixed <br /> with clean soil and spread out in nearby open areas to enhance <br /> evaporation and natural degredation. Excavation of the heavily <br /> contaminated material would not only minimize the quantity of oil that <br /> could be remobilized once the water table rises again but also expose any <br /> oil that may still be floating on the water table underneath thus <br /> facilitating its recovery. If the contaminated soil is excavated it <br /> should be spread over open areas where it will not be compacted by foot <br /> or vehicular traffic. Sufficient access should be available such that <br /> the soil can be turned, plowed or otherwise aerated to enhance <br /> evaporation and natural degradation. We recommend that a Woodward-Clyde <br /> representative be present during excavation. These recommendations are <br /> contingent upon the soil contamination being less than the 100 ppm limit <br /> suggested by the Regional Water Quality Control Board and obtaining <br /> approval from the Board and possibly the Department of Health Services to <br /> spread the contaminated soil over the ground. If this is not possible <br /> and the material requires Class I disposal, then other, more cost <br /> effective alternatives should be evaluated. <br /> The monitoring wells should be checked at least once a month for visible <br /> evidence of contamination with more frequent monitoring once the rainy <br /> season begins again. <br /> If you have any questions or comments on this report please do not <br /> hesitate to contact me. <br /> Sincerely, <br /> 14"7Z-- <br /> Martin Cramer <br /> Project Scientist <br /> MC/jt <br /> 7029c <br />