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The soils have been checked on several occasions by the use of a <br /> gastech model 13145 meter for the detection of hydrocarbons . After the <br /> fourth week of aeration no detectable hydrocarbons where found. On <br /> October 3, 1990 two undisturbed soil samples were taken for laboratory <br /> analysis. A chain-of-Custody form was prepared and the samples <br /> delivered to A & L Western Agricultural Laboratories, Inc. in Modesto. <br /> Sample procedures followed were those outlined in Work Plan dated <br /> August 1, -1990 and in conservation with Harlin Knoll . The results from <br /> A & L Laboratories indicate no contamination was present in the <br /> stockpile. <br /> b CONCLUSIONS <br /> Contaminated soils at site from 500 gallon paint thinner tank were all <br /> removed by October 3, 1990. This is evident by the laboratory testing <br /> which showed no detectable levels of contamination on sides or bottom <br /> of the excavation. Aeration of stockpiled soil has been completed as <br /> evident by laboratory test results from soil taken October 3, 1990 <br /> test, see Appendix A. <br /> RECOMMENDATIONS <br /> We recommend closure of the site. We recommend all stockpiled soils <br /> which were once contaminated and are now clean be returned to the <br /> excavation. <br /> r <br />