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GeoSoly, LLC ' <br /> Environmental find Hydrogeologieal Consulting r <br /> 643 Oregon Street, Sonoma, (:A 95476 <br /> Phone: (707) 996-4227 Fax: (707) 996-7582 <br /> We Dont Just Work on Your Environmental.Prohlems. We Solve Them! <br /> March 20, 1998 <br /> ._---7 <br /> 5tove'5asson '� <br /> Environmental Health<S ecialist <br /> Senior Enver P <br /> San Joaquin County, Public Health Services <br /> Environmental Health Division, Site Mitigation Unit <br /> 304 East Weber Avenue, 3rd Floor <br /> P.O. Box 388 Phone: (209) 468-3459 <br /> Stockton, CA 95201-0388 Via FAX: (209) 464-0138 <br /> Subject: AMENDED WORKPLAN FOR A ADDITIONAL SUBSURFACE <br /> ENVIRONMENTAL INVESTIGATION FOR: <br /> Ronald Nunan/Jon Jernigan for the Former UST site located at the <br /> Town and CountLry Chevron 13336 H 8$ Lockeford CA <br /> Dear Mr. Sasson: <br /> I appreciate your concurrence with my recommendation for site closure for the <br /> above mentioned site. As you know, the responsible party requires concurrence with <br /> the Regional Board. Pat Anderson of the Regional Board has stated to me that she <br /> agrees that the lateral extent of contamination in soil has been defined so that the <br /> site poses no credible risk to human health and the environment. Pat Anderson, <br /> however, is still concerned about the vertical extent of benzene in soil at the site. <br /> She stated that the presence of a, clean, sapolitic clay at the bottom of the deepest <br /> borehole is not sufficient to demonstrate that the vertical extent of contamination <br /> has been adequately defined. We agreed, in concept, that if one additional <br /> borehole is extended through the most contaminated portion of the plume and <br /> establishes that the benzene in soil cannot impact groundwater resources, she will <br /> support site closure. Attenuation calculations for the vertical migration of <br /> hydrocarbons and estimation of the overall mass of hydrocarbons at the site will <br /> also be provided. The final subsurface investigation report will include lab results, <br /> field data interpretations, illustrations, calculations, conclusions and <br /> recommendations and will be submitted to the San Joaquin County Health <br /> Department and the Regional Board for approval. If you have any questions, please <br /> call me. <br /> Sincerely, <br /> V <br /> � A,l!'r..�.z. <br /> Franklin J. Goldman . =$` R"' `. <br /> j` .. , <br /> CEO/GeoSoly, LLC <br /> Registered Geologist No. 5557 <br /> Certified Hydrogeologist No. 466 <br />