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n - <br /> DAMES & MOORE A PROFESSIONAL LIMITED PARTNERSHIP <br /> 1320 EAST SHAW AVENUE, SUITE 110, FRESNO, CALIFORNIA 93710 (209)222-7892 <br /> FAX(209)222-1937 <br /> October 31, 1991 <br /> San Joaquin County <br /> Department of Environmental Health <br /> P.O. Box 2009 NViROPYivilEINTAL <br /> Stockton, CA 95201 <br /> Attention: Diane Henson <br /> RE: Problem Assessment Report Proposal <br /> Pacific Gas & Electric <br /> Stockton Service Center <br /> 4040 West Lane <br /> Stockton, California <br /> Dear Ms. Henson: <br /> In response to a telephone conversation between Jesus Luna of Pacific Gas & Electric <br /> (PG&E) and yourself on October 31, 1991, Dames & Moore has been requested to submit <br /> an addendum to the above referenced Problem Assessment Report(PAR)proposal in order <br /> to answer questions raised by the San Joaquin County Department of Environmental Health. <br /> Based upon a review of the analysis from the initial samples collected during the tank <br /> removal, it is Dames & Moore's opinion that the low levels of petroleum hydrocarbon <br /> reported in native soils beneath the tanks do not suggest a high residual concentration of <br /> petroleum hydrocarbon at the tank removal location. Therefore, we proposed that the <br /> approximately 35 foot by 35 foot by 15 foot existing excavation pit be further excavated by <br /> five feet and confirmation sampling be conducted in the same seven areas as previously <br /> sampled during the initial tank removal plus two additional samples from the approximate <br /> midline of the pit, as referenced in Figure 1, for a total of nine soil samples. <br /> It is anticipated that approximately 227 cubic yards of soil will be excavated during the <br /> process based on 35 foot by 35 foot by 5 foot calculations. This soil will be placed on <br /> visquene plastic sheeting which has been placed over supporting cribbing (in order to <br /> facilitate any stormwater runoff, if present), covered with tarps, and stockpiled on site <br /> pending the analytical results. This soil will be in addition to the approximately 275 cubic <br /> yards currently stockpiled on-site from the tank removal. Once the analytical results of the <br /> newly excavated soil are made available, the soil will be disposed of properly by PG&E <br /> following current federal, state, local. rules and regulations. <br /> OFFICES WORLDWIDE <br />