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4 Soils beneath the remaining wastewater line were sampled and found to contain low to <br /> nondetectable levels of petroleum hydrocarbons As a result, the line was approved for <br /> closure in place by grouting with cement Closure was performed on June 10, 1993, <br /> under supervision of San Joaquin County <br /> 5 Soils impacted by petroleum hydrocarbons from the USTs and associated surface structures <br /> have been completely excavated, with the exception of a small isolated quantity adjacent to <br /> the existing sand tower Because of the small quantity of contaminated soil and fine-grained <br /> nature of the surrounding native soils, the remaining contaminated soil should not pose a <br /> threat to ground water Therefore, UST activities at the Stockton Railyard are considered <br /> complete and should require no further action <br /> 13 <br /> ENVIRONMENTAL SOLUTIONS <br />