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ENGINEERING CORPORATION <br /> OCT '3 'D" <br /> October 2, 1990 <br /> ENVIROI`+is/}moi <br /> _ <br /> r <br /> Ms. Darlene Reuss <br /> San Joaquin Public Health Services COPY <br /> Environmental Health Division <br /> P.O. Box 2009Stockton, CA 95201 <br /> Attn: Ms . Darlene Reuss <br /> RE: De Rollo Mazda, 308 Grand Street, Stockton, CA <br /> Dear Darlene: <br /> Enclosed please find a copy of the Preliminary Assessment Report <br /> for the subject property. I apologize for the delay but I thought <br /> a copy had been forwarded to you. Also this letter is provided as <br /> an addendum to the workplan outlined in WaterWorks Preliminary <br /> Report dated October 11 , 1989 for the above referenced site (figure <br /> 1 ) . Concentrations of 470 parts per million (ppm) total <br /> hydrocarbons and 0 . 05, 1 .2 , 1 . 9 and 18 ppm of benzene, toluene, <br /> ethylbenzene and xylene were detected in the soil sample collected <br /> at a depth of 15 feet under the north end of the gasoline tank B <br /> (Figure 1) . A vertical soil boring drilled adjacent to this sample <br /> point did not record gasoline hydrocarbons above method detection <br /> limits in samples collected at 20 . 5, 25 . 5 and 30 . 5 feet below grade <br /> (Table 1 ) . Groundwater was encountered at approximately 31 feet <br /> below grade. We propose re-excavation of this area to remove the <br /> gasoline contaminated soils which are a potential source for <br /> groundwater contamination. An amendment to the workplan which <br /> includes removal of these gasoline contaminated soils is presented <br /> below. <br /> Amendment to Proposed Workplan: <br /> To remove the remaining gasoline contaminated soils from the north <br /> end of this tank pit, Telic Engineering proposes to re-excavate <br /> this end of the pit to a depth of 15 to 25 feet. <br /> The following scope of work is proposed: <br /> 1 . Re-excavate the north wall and floor of tank pit B. <br /> Excavation will be continued laterally and vertically until <br /> visual and PID screening indicate that the contamination has <br /> been removed. This field area will be excavated to a maximum <br /> dept of 25 feet . <br /> LIC. # A 569559 POST OFFICE BOX 2076 STOCKTON, CALIFORNIA 95201 2091465-2000 <br />