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Applied Geotechnology Inc. <br /> July 26, 1990 . 747 A�y I, - <br /> 14,937.043rs`' <br /> J U L 3 0 11990 <br /> Mr. Frank May ENVIRONMENTAL HEALTH <br /> USG Corporation PERMIT/SFRViCES <br /> 101 South Wacker Drive <br /> Chicago, Illinois 60606-4385 <br /> Dear Frank: <br /> Work Plan <br /> Soil Remediation <br /> 1433 Tillie Lewis Drive <br /> Stockton, California <br /> In accordance with your July 11, 1990 request, this letter presents our work <br /> plan to remediate petroleum hydrocarbon contaminated soil at the referenced <br /> address. This work is prompted by information we obtained in performing the <br /> environmental assessment of the subject property to document conditions in <br /> preparation for its sale. Assessment procedures and results are presented <br /> in our July 9, 1990 report. <br /> BACKGROUND <br /> The subject property occupies a total of 3.2 acres in San Joaquin County, <br /> California, inside the Stockton city limits. The relatively level site is <br /> located southwest of the intersection of Tillie Lewis Drive and Navy Drive <br /> approximately one mile south of the Port of Stockton, as shown on Figure 1. <br /> A shallow ditch captures surface water runoff from a paved area west of an <br /> existing building on-site. Sediment samples were collected from the ditch <br /> for chemical analysis. One sample (S-1) contained 3,500 mg/kg (parts per <br /> million) total petroleum hydrocarbons identified by the analytical labora- <br /> tory as diesel fuel. This sample is located at the head of the ditch which <br /> receives runoff directly from the paved area. Based on our understanding of <br /> historical land use, the diesel fuel probably originated from miscellaneous <br /> minor spills and drips from equipment previously parked in thepaved area. <br /> Contamination is likely limited to sediment in the ditch near the paved area <br /> and to surficial soils adjacent to the ditch. We anticipate less than 10 <br /> cubic yards of sediment and soil contain hydrocarbons above the regulatory <br /> limit, as discussed in the following section. <br /> PURPOSE AND SCOPE <br /> Our objective will be to remove soil containing fuel hydrocarbons at concen- <br /> trations above current Regional Water Quality Control Board (RWQCB) limits, <br /> which will likely be 100 parts per million (ppm) Total Petroleum Hydrocarbon <br /> (TPH) . The San Joaquin Local Health Department will likely be the lead <br /> regulatory agency reviewing remediation progress. <br /> P.O. Box 3885 Bellevue.WA 98009 FAX 206/646-9523 Telephone 206/453-8383 <br />