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v � 1 <br /> 14:24 FR`. ' <br /> 01OLOG I CA1L TECHNICS TO JOADUIN CTY P.02 <br /> Geofogica(Technia Inc. <br /> =1 <br /> MoAfto,Caafornia 9.f35; <br /> June 10, 1991 <br /> Mr. William Stewart <br /> 452 'West Lowell <br /> Tracy, California 95376 <br /> lY <br /> RE: STEWART'S BEACON <br /> PROJECT NO. 01-17.1 <br /> Dear Mr. Stewart: <br /> Margaret Lagoria of San Joaquin County Department of Health contacted Geological <br /> Technics Inc. in late May and requested an update report on our project at 515 W. <br /> 11th Street in Tracy, CA. In response to that request, I have prepared the following <br /> status report summarizing work on your site since January 1990. The analytical data <br /> generated for this site is summarized in Figure 1 while the data sheets are given in ,t <br /> Appendix A. <br /> Ex ava on and Dewatering ;i <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 t. <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 k <br /> the excavation and it appears that a small amount remains to the northwest and <br /> northeast. , <br /> During dewatering, contaminated water was container 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 /> water into 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 n' <br /> Appendix B), <br /> y <br /> W <br /> r <br /> ,7x <br /> _fin _� ..... ...-. <br />