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so Gwfogiw(Technics Inc. 2601 nwXW gsto,CaUfmnia 51 (2 )5-8-6V11Yax#538-5852 Ktt;EIVLU + J U N 13 1991 June 10, 1991 ENVIRONMENTAL HEALTH PERMIT/SERVICES Mr. William Stewart 452 West Lowell Tracy, California 95376 RE: STEWART'S BEACON PROJECT NO.01-17.1 Dear Mr. Stewart: Margaret Lagoria of San Joaquin County Department of Health contacted Geological Technics Inc. in late May and requested an update report on our project at 515 W. 11th Street in Tracy, CA. In response to that request, I have prepared the following status report summarizing work on your site since January 1990. The analytical data generated for this site is summarized in Figure 1 while the data sheets are given in Appendix A. Excavation and Dewatering In January 1990, Geological Technics Inc. and SEMCO started work on implementing the Remedial Action Plan (RAP). The tank excavation pit was deepened and enlarged and approximately 352 cubic yards of soil was removed. This material was stockpiled on site in the northwest corner of the property. To accomplish removal of contaminated soil below the water table, the excavation was dewatered and soil was removed down to 14 feet. There is some contaminated soil remaining north of the excavation and it appears that a small amount remains to the northwest and northeast. During dewatering, contaminated water was contained in a swing tank. It has been tested several times and has been found to be clean of petroleum hydrocarbons (December 1990). The City of Tracy so far has not given permission to dispose of the water into the sanitary sewer system. However, we should again request permission to release the water to the City because they initially told us that the water could be released to them if it did not contain petroleum hydrocarbons (see reference letter in Appendix B).