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Rajappan&Meyer Date:3/3/99 <br /> Arch Road/Highway 99 • • Page: 9 <br /> 5.0 CONCLUSIONS <br /> The geophysical survey and subsequent subsurface investigation indicate that any former <br /> USTs have been removed. Results of the shallow soil samples analyzed for BTEX and <br /> TPH-G did not indicate concentrations above the method detection limits. Very low <br /> ' concentrations of diesel are present throughout the site which is probably the result of the <br /> area being utilized for a turn-around for diesel trucks. Because diesel is present in every <br /> sample, at generally the same low concentrations, these results are not indicative of a <br /> source(e.g., leaks from a prior UST). <br /> Based on the analytical results of the surface soil samples, vehicular exhaust has not <br /> significantly impacted the surface soil in the vicinity of the interchange with lead. <br /> Likewise, the subsurface soil samples did not indicate the presence of elevated <br /> concentrations of lead, and do not appear to have been impacted by vehicular exhaust. <br /> Based on the geophysical survey, there appears to be a utility line located at the former <br /> gas station site. It is approximately 150 feet long with a 90 degree elbow. The pipe does <br /> not appear to be connected to anything (it may have connected the UST's to the pump <br /> island). During construction of the new off-ramp the pipe should be excavated and <br /> disposed. Refer to Plate 2 in the Geophysical Survey Report (Appendix A) for the <br /> location of the pipe. <br /> URSGWC does not believe that additional work is warranted. However, the San Joaquin <br /> County Environmental Health Department has requested a copy of the report for their <br /> review. <br /> R&M/Arch Rd/43-00066762.00.5000 <br />