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LEVINE-FRICKE <br /> concentrations of benzene (0. 0013 ppm) found in shallow ground <br /> water from test pit A-2 and the TPH as gasoline (2. 0 ppm) <br /> detected in the vicinity of boring B-14 appear to be restricted <br /> to the immediate vicinity of test pit A-2 and boring B-14- <br /> Migration of these compounds is expected to be limited, and the <br /> compounds tend to degrade naturally over time. For these <br /> reasons, along with the fact that the shallow ground water is not <br /> used for drinking water, the presence of the compounds detected <br /> does not appear to represent a significant environmental hazard. <br /> In light of the relatively low concentrations of dissolved <br /> hydrocarbons found in the shallow ground water, it is considered <br /> unlikely that a major source of these compounds (e.g. , a leaking <br /> underground storage tank) is present. Concentrations in the <br /> ranges detected are typical of cases where spillage or disposal <br /> of small quantities of fuels has occurred. Likely sources of the <br /> petroleum hydrocarbons detected in ground water in this area are <br /> surface spillage from containers and/or equipment formerly stored <br /> in the vicinity of boring B-14, and possible disposal of <br /> materials containing small quantities of petroleum hydrocarbons <br /> such as gasoline and waste oils in the garbage pit reportedly <br /> located in the vicinity of B-15. (Evidence of surface spillage <br /> of petroleum hydrocarbons was visually observed in the vicinity <br /> of boring B-14 during the reconnaissance inspection of the Site <br /> by Levine-Fricke. ) <br /> Based on the above information, it is not anticipated that <br /> regulatory agencies will require a remedial response to address <br /> these concentrations. However, as discussed with you by <br /> telephone on August 17, 1989; it may be prudent to install a <br /> ground-water monitoring well in the vicinity of test pit A-2 and <br /> boring B-14 to verify conclusions regarding ground-water quality <br /> at this location. Per your verbal authorization, we are <br /> including the installation and sampling of this well in the Work <br /> Plan currently being prepared for ground-water monitoring at the <br /> former location of the above-ground diesel fuel tank, which is <br /> approximately 400 feet to the west. <br /> Please contact me or Tom Johnson if you have any questions with <br /> respect to the above. <br /> Sincerely, <br /> ORIGINAL <br /> Signed by: <br /> Beth Gurney, R. L.A. <br /> Senior Scientist <br /> cc. Jerry <br /> i <br />