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{ <br /> 0 <br /> 26250)lfideeawn Street, Thoralon,CA <br /> 6354542ESAII <br /> -II- <br /> 6.0 RECOWdENDATIONS AND OPINIONS <br /> Soil samples collected and analyzed at the areas of concern at the site did not contain detectable volatile organic <br /> compounds or total petroleum hydrocarbons as gasoline. The highest concentration of TPH as diesel was 54 mg/kg <br /> and TPH as oil was 450 mg/kg. These were detected in the 3 foot sample from boring 4,near the leach field. The <br /> next deepest sample at a 5 foot depth was analyzed and contained no detectable TPH as diesel and 6.4 mg/kg TPH <br /> as oil. Based on these results,no threat to groundwater exists. <br /> Detected concentrations of TPH as diesel and TPH as oil are below the Regional Water Quality Control Board- San <br /> Francisco Region, Environmental Screening Levels for commercial use properties for these contaminants. The <br /> elevated concentrations of TPH as diesel and oil are limited to a shallow depth and do not pose an unacceptable risk. <br /> Because this is only a surface release,no further action is warranted,as further degradation of the contaminants will <br /> occur over time,and no threat to groundwater exists. <br /> Based on the results of the subsurface investigation, Odic Environmental recommends no further action <br /> minimal risk of contamination at the Subject Property, due to <br /> ODIC Environmental <br />