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IMr Michael Walton a <br /> Walton Engineering <br /> August 4, 1998 _ <br /> DISCUSSION <br /> IIncluding soil generated during the tank removal work and soil generated during the excavation work <br /> for the new tank installation, a total of approximately 450 to 500 cubic yards of soil was removed <br /> from the subsurface area of the former underground storage tanks at the site It is our understanding <br /> that the stockpiled soil maternal has been removed from the site and transported by a licensed hauler <br /> to Forward, Inc , of Stockton, California <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> I Based on the results of the soil sampling and laboratory analysis program, conducted by Grayland <br /> during the tank removal work at the site, it appears that soul contamination has occurred beneath the <br /> surface of the site as a result of the operation of the former underground fuel storage tank system <br /> The highest concentrations of volatile organic oxygenates MtBE and tBA were detected in the soil <br /> sample collected from the southern end of former underground storage tank T2 (apparent source <br /> location) <br /> Grayland recommends that a site contamination work plan be developed to assess the vertical extent <br /> and magnitude of the subsurface contamination at the site To evaluate the vertical extent of <br /> subsurface soil contamination and the potential for groundwater contanunatnon beneath the site, a <br /> minimum of two soil borings should be completed at the site If subsurface soil contamination <br /> liepersists with depth,at least one of the soil borings should extend to groundwater in order to establish <br /> depth to groundwater beneath the site and to evaluate groundwater quality by collecting a <br /> groundwater grab sample <br />' With your authorization, Grayland will forward a copy of this report to SJCEHD for their files <br /> Thank you for the opportunity to provide our geological environmental consulting services to Walton <br />' Engineering <br />' Sincerely, <br /> Grayland Environmental <br /> 65� rte.5597� <br />' ` 1 EV6 0/99 <br /> VCU ` <br />' Jeffrey A. Clayton, R G , REA <br /> Principal Geologist ?'!eco% <br />' JAC rbc <br /> cc Mr Eric W Trevena (SJCEHD) <br />' attachment Appendix A - Laboratory Report <br /> GRA YLAND ENVIRONMENTAL <br />' Grayland 022-140 trr 5 <br />