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Mr. Michael Walton <br />Walton Engineering <br />March 20, 1998 <br />collected from approximately 3 feet below ground surface at sample location FD2 contained 0.65 <br />ppm MtBE (Appendix A). <br />Including soil generated during the overexcavation work, a total of approximately 400 cubic yards <br />of soil was removed from the area of the former underground storage tanks. This stockpiled soil <br />material was removed from the site and transported by the owner (responsible party) to Forward, <br />Inc., of Stockton, California, a licensed sanitary receptacle. <br />CONCLUSIONS AND RECOMMENDATIONS <br />Based on field evidence and the results of the soil sampling and laboratory analysis program, <br />conducted by Grayland during tank removal and overexcavation work at the site, it is apparent that <br />soil contamination has occurred beneath the surface of the site as a result of the operation of the <br />former underground fuel storage tank system. Significant soil contamination beneath the site, <br />however, was successfully removed by the excavation work conducted at the northwest corner of <br />the former fuel tank excavation. Based on laboratory analytical data, it appears that only residual <br />soil contamination remains beneath the site. <br />Because only low concentrations of fuel hydrocarbons in the range of diesel fuel remain in the <br />subsurface soil at approximately 24 feet below ground surface, the site is likely a candidate for <br />closure, based on low risk soil only closure criteria. Grayland recommends, therefore, that no <br />further environmental work be conducted at the site and that SJCEHD determine if the site meets <br />the criteria for closure. With your authorization, Grayland will forward a copy of this report to <br />SJCEHD for review. Thank you for the opportunity to provide our geological environmental <br />consulting services to Walton Engineering. <br />Sincerely, <br />Grayland Environmental <br />Jeffrey A. Clayton, R.G., REA <br />Principal Geologist <br />JAC.jbc <br />cc: Ms. Letitia Briggs (SJCEHD) <br />No. 5557 ' <br />Exp. $/ V% <br />GRA YLAND ENVIRONMENTAL <br />' Grayland 022-160Aff 7 <br />