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ME <br /> #-t I <br /> e�� <br /> WIN-- <br /> _ r _ k rar .�.a +• _a a, C <br /> r <br /> JL <br /> I (- GROUNUMI LIQ <br /> `I xi[NOLOGY, INC. <br /> February 6, 1989 <br /> Proposal No. 202/899-7004 <br /> Mr. David Brent <br /> - California Regional Water <br /> Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 9582:-3098 <br /> RE: PROBLEM ASSESSMENT <br /> LAMMERSVILLE SCHOOL, TRACY, CA 95376 <br /> Dear Mr. Brent: <br /> Groundwater Technology, Inc. (GTI) presents this proposal for <br /> additional site assessment work at the Lammersville School in <br /> Tracy, California. The work steps included in this written <br /> proposal would provide the hydrogeologic and chemical data needed <br /> for preparation of a Problem Assessment Report (PAR) which is <br /> required by the California Regional Water Quality Control Board, <br /> Central Valley Region (CRWQCB-CVR) . In order to define the <br /> downgradient extent of the dissolved hydrocarbon plume, GTI <br /> recommends the following work steps: <br /> " Install three additional 2-inch diameter PVC monitoring 1 <br /> wells to a total depth of 20 feet at the approximate <br /> locations shown in Figure 1. <br /> Collect soil samples at 5-foot intervals to total depth <br /> of the wells, using a split-spoon sampler and brass <br /> sample tubes. <br /> " Select one soil sample from each boring and submit the <br /> samples to an analytical laboratory for analysis of <br /> - total petroleum hydrocarbons (TPH) as gasoline, and <br /> benzene, toluene, ethylbenzene, and xylene (BTEX) <br /> concentrations <br /> Survey the three new wells for elevation control . <br /> Monitor groundwater levels and collect water <br /> samples from all monitoring wells. The wells <br /> would be purged by bailing prior to sampling to <br /> insure representative formation water is obtained <br /> for analysis -- - --- <br /> l)lfnyts tlnr,ur•lo-nr!!hr f'F. C,amrla r.,,,1 n.,r.i a., <br />