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%/VAP-t <br /> Working To Restore Nature <br /> Samples were collected by driving two-inch diameter brass rings into undisturbed soil, then <br /> capping each end of the brass rings with teflon tape and plastic end caps. Samples were <br /> preserved on ice and transported under chain of custody to state-certified Sequoia Analytical. <br /> To avoid the possibility of cross contamination, all drilling and sampling equipment in contact <br /> with soils was decontaminated between uses by steam cleaning. Steam cleaning rinsate and soil <br /> cuttings were contained in DOT approved drums and remain on-site. Borings were abandoned <br /> by filling with a cement grout through the augers using the tremie method. All field work was <br /> performed in accordance with the Site Safety Plan included as Attachment 1. Field logs are <br /> included as Attachment 2. <br /> LABORATORY ANALYSES <br /> Collected soil samples were analyzed by Sequoia Analytical (DHS certification no. 1210) for <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX), total petroleum hydrocarbons as gasoline <br /> (TPHg), and total lead using EPA methods 8020, 8015 (modified), and 6010, respectively. In <br /> addition, two samples collected from beneath the former lubrication facility were analyzed for <br /> total oil and grease by EPA method 5520 E&F. <br /> No petroleum hydrocarbon constituents were detected in any sample, with the exception of the <br /> sample collected from boring SB-1 at a true vertical depth of 15 feet below grade. Total oil and <br /> grease (TOG) was detected in this sample at 83 parts per million (ppm). This level is within <br /> acceptable levels established by San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD), based on conversation with PHS/EHD staff. <br /> Total lead was detected in each sample at levels ranging from 5.5 to 12 ppm. These levels are <br /> considered to be within accepted background (Dragun and Chiasson, 1991) levels for lead in <br /> soil. Analytical results are summarized in Table 1. Laboratory data sheets are included as <br /> Attachment 3. <br /> CONCLUSIONS <br /> Based upon the subsurface investigation at the subject site, the following conclusions can be <br /> made: <br /> o Soil beneath the former USTs and dispenser island does not appear to have been <br /> impacted by gasoline hydrocarbons; <br /> SR-1093.FNL 2 <br />