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f <br /> Geo(ogica[ echnics Inc. <br /> :b'01:q�c:4p� <br /> oda to, 95351 <br /> 9091518-64241%at st 538-5852 <br /> June 14, 1991 JUN 13 IIpjl <br /> ENV1R,N�14ENTAL <br /> HEALTH <br /> }I <br /> PERMIT/SERMI-ES <br /> Mr. William Stewart <br /> 452 West Lowell <br /> Tracy,California 95376 = <br /> RE., STEWARrS BEACON <br /> PROJECT NO.01-17.1 <br /> Dear Mr. Stewart. <br /> Margaret La-7oria of San Joaquin County Department of Health contacted Ge <br /> 1W. <br /> ological <br /> Technics Inc. in late May and requested an update report on our project at 55 eat request, I have prepared the following <br /> 11th Street in Tracy, CA, In response to t <br /> status report summarizing work on your site since January 1990. The analytical data <br /> —' generated for this site is summarized in Fib xe 1 while the data sheets are given in <br /> Appendix A. <br /> 4: <br /> s <br /> Excavation and Dewaterin <br /> In January 1990, Geological Technics Inc. and SEMCO started work on implementing <br /> the Remedial Action Plan (RAP). The tank excavation pit was deepened and <br /> enlarged and approximately 352 cubic yards of soil was removed. This material was <br /> stockpiled on site in the northwest corner of the property. To accomplish removal <br /> of contaminated soil below the water table, the Excavation was dewatered and soil <br /> was removed down to 14 feet. There is some contaminated soil remaining north of <br /> the excavation and it appears that a small amount remains to the northwest and <br /> northeast. <br /> During dewatering, contaminated water was contained in a swing tank. It has been <br /> tested several times and has been found to be clean of petroleum hydrocarbons <br /> (December 1990). The City of Tracy so far has not given permission to dispose of the <br /> waterinto the sanitary sewer system. However, we should again request permission <br /> to release the water to the City because they initially told us that the water could be <br /> released to them if it did not contain petroleum hydrocarbons (see reference letter in <br /> Appendix B). r <br /> s, <br />