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January 23, 1987 <br /> AGS Job #8696-2 <br /> Page 2 <br /> Samples were analyzed by Applied Geosystems' laboratory, which is <br /> certified by the state of California for the analyses performed. <br /> Samples were analyzed for total volatile hydrocarbons (TVH) and <br /> gasoline constituents (BTEX - Benzene, Toluene, Ethylbenzene, <br /> Xylene) . <br /> We interpret the available chemical, data to indicate that soil <br /> contamination has been effectively mitigated to the north and <br /> west of the tank cavity. Samples S-16-1 and S-18-3 were <br /> contaminated at higher levels, and were beyond the reach of the <br /> equipment used. in our opinion, further excavation to the south <br /> would undermine the loading dock of the Creamery, and further <br /> excavation to the east would require widening of the tank cavity. <br /> Can the basis of our field observations of the decrease or <br /> attenuation in levels of contamination with distance from the <br /> central part of the tank cavity, we consider it most likely that <br /> contamination levels above 100 ppm are restricted to an area less <br /> than five feet from the currently exposed south and east walls of <br /> the tank cavity. <br /> • A copy of this letter should be forwarded to Ms. Laurie Cotulla, <br /> of the San Joaquin Local Health District, and to Mr. Gordon <br /> Boggs, of the California Regional water Quality Control Board. <br /> If you have any questions regarding the information presented <br /> here, please do not hesitate to call. <br /> Sincerely, <br /> Applied Geosystems <br /> Andrew P. Lys <br /> Project G ist <br /> Mich' 1 AT. Clark <br /> C.E.G. 1264 <br /> Attachments• Table 1 Labo: :tory Results <br /> Plate P-1 Site Vicinity Map <br /> Plate P-2 Generalized Site Plan <br /> Laboratory Report of Analyses <br /> i <br />