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C:laN ton <br /> • 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 analyses of samples of aerated soil, Clayton recommended <br /> backfilling the: excavation on September 28, 1990 Soil backfilbnW ryas completed in <br /> the week ending October 21, 1990. Because of residual oil and gre, , 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 hare a low level ok hydrocarbon <br /> contamination. <br /> Clayton recommends no further soil or groundwater remediation at this site <br /> i <br /> _iz_ <br />