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Mr. Harlin Knoll <br /> February 19, 1990 <br /> Page 4 j <br /> becomes impractical. If soil samples collected at the practical limit of excavation still contain detectable <br /> BTEX and TPH concentration levels, the excavation will be backfilled and either additional investigation <br /> will be performed to implement remedial measures or a health risk assessment will be performed. <br /> After the former underground storage tanks have been removed a water sample will be collected from the <br /> excavation, if water is present. Prior to sample collection, a visual observation will be made and recorded <br /> for evidence of floating product. Next, the excavation will be pumped to the on-site ground water <br /> treatment system and allowed to recharge. A water sample will then be collected from the excavation with <br /> a disposable teflon bailer, transferred to a volatile organic analyses vial, and sent �to an analytical <br /> laboratory for chemical analyses of BTEX, EDB, TPPH, and tetra ethyl lead. <br /> - _ _ _. . _ .c - - - _ _ - <br /> Excavation, sampling, or backfill work, involved with the excavation of the existing tanks or installation <br /> of the new tanks, will not be performed without the presence of a representative of the County. It is <br /> Delta's understanding that the County may decide that their presence is not required and the County <br /> representatives will verbally instruct Delta to proceed with the planned activities in their absence. <br /> We anticipate that the underground gasoline tank replacement activities will be completed within 2 weeks <br /> of start-up of the dewatering system. 11 <br /> It is Shell's intention that this project proceed smoothly and in a timely fashion. Delta will cooperate fully <br /> with County requirements and sampling procedures as outlined in this letter. If you have any question <br /> regarding this plan or the project in general, please call us at (916) 638-2085. <br /> I <br /> Sincerely <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> / I <br /> i <br /> Lee N. Brennan, P.E. ; <br /> Civil Engineer <br /> I! <br /> I� <br /> JamBrownellR <br /> Hogist/Proj <br /> ect Manager <br /> i <br /> LS:LNB:JRB: i <br /> II <br /> cc: Mr. Ray Newsome, Shell Oil Company <br /> Ms. Diane Lundquist, Shell Oil Company f <br /> Mr. Tom Peltier, California Regional Water Quality Control Board, ii <br /> Central Valley Region i <br /> Ms. Carrie Cummings, Forward Inc. <br /> Mr. Keith Johnson, City of Sacramento Solid Waste <br /> Management Division <br /> Mr. Patrick Maxfield, Sacramento County Solid Waste <br /> Management Division <br /> Mr. Robert Sagaser, City of Tracy <br /> i= <br />