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5 <br /> Ms. Carrie Cummings <br /> April 30, 1990 <br /> Page 2 <br /> analytical laboratory will composite the four collected samples into one sample. The composited <br /> samples will then be analyzed for concentrations of benzene,"toluene, ethylbenzene,xylenes, and TPH <br /> as gasoline using U.S.Environmental Protection Agency and California Department of Health Services <br /> approved methods. <br /> The excavated soils will be transported by trucks for disposal within 48 hours of excavation. To <br /> facilitate this, a mobile on-site analytical laboratory or a 'local laboratory capable of providing a <br /> 12-hour turnaround on sample analyses will be retained to perform the analytical work. <br /> Trucks containing soil with TPH concentrations less than 1,000 ppm will be sent to the Forward, Inc., <br /> Landfill. Trucks with concentrations greater than 1,000 ppm or less than 100 ppm will be sent to <br /> other landfill facilities. <br /> The certified analytical results will be sent to Forward, Inc., via facsimile transmission prior to the <br /> arrival of the trucks at the landfill. We anticipate that the trucks will arrive at Forward, Inc., during <br /> the first two weeks of May 1990. If you have any questions or require additional information, please <br /> call me at (916) 638-2085. I would appreciate a response to this letter as soon as possible. <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC <br /> Zl� <br /> James R. Brownell <br /> Hydrogeologist/Project Manager <br /> JRB:ecd <br /> Enclosures <br /> cc/enc: Ms. Diane Lundquist, Shell Oil Company <br /> Mr. Ray Newsome, Shell Oil Company <br /> Mr. Harlin Knoll, San Joaquin County Public Heatlh Services <br />