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Clayton <br /> �,R0%%Ij%II,- <br /> CONRif-t%[, <br /> y, The concentration of TPH as oil and grease ranged from 50 parts per million <br /> (ppm) to 300 ppm. <br /> Based on the results of analysis of samples of aerated soil, Clayton recommended <br /> backfilling the excavation on September 28, 1990. Soil backfilling was completed in <br /> the week ending October 21, 1990. Because of residual oil and grease in the aerated <br /> soil, a 2-foot layer of compacted clay was placed in the bottom of the excavation, <br /> before it was filled with aerated soils. This clay layer was installed to provide a barrier <br /> between groundwater and shallow soils which have a low level of hydrocarbon <br /> contamination. <br /> Clayton recommends no further soil or groundwater remediation at this site. <br />