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L � <br /> Geo(ogical Technics Inc. <br /> :601:�vrr:e� <br /> 1 foduto,Caaf=ia Y5351 <br /> (209)S38•o'r24/fu��$38.5352 .. r.. <br /> i „oar <br /> J U 13 <br /> June 10, :991 EKVJP0P,'i'V7ENT/-,L HE,ALP7 <br /> Mr. William Stswart <br /> 452 West Lowell <br /> Tracy,r`-ilifornia 95376 <br /> RE: STEWART'S BEACON <br /> PROJECT NO.01-17.1 <br /> i <br /> Dear Mr.Stewart: : <br /> AMargaret 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 315 W. <br /> lith 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 I while the data sheets are given in <br /> Appendix A. <br /> f • , <br /> Excavation and Dewaterin <br /> In January 1990,Geological Technics Inc. and SEMCO started work on implementing <br /> the Remedial Action Plan (RAT'). 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 cornerof 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 /> 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 thein if it did not contain petroleum hydrocarbons (see reference letter in <br /> Appendix B). <br />