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Mr Chuck Carmel <br /> = May 11, 1992 <br /> Page 2 <br /> j <br /> Benzene concentrations this quarter ranged from nondetectable in several wells to 480 <br /> micrograms per liter (pg/1) in well W-3 TPH-G concentrations ranged from nondetectable <br /> in several wells to 4,100 pg/1 in well W-3 The detection limits for the BETX constituents <br /> and for TPH-G are 0 5 and 50 pg/1, respectively Figure 3 is a contour map of the benzene <br /> concentrations <br /> Discussion <br /> The general groundwater flow direction fluctuates from southeast to the southwest at this site <br /> The current southern flow direction is consistent with previous flow directions The hydraulic <br /> gradient did not fluctuate significantly from gradients measured during the last year Since <br /> October 1992, water-level elevations have increased by an average of 2 68 feet The average <br /> depth to water is 6155 feet The concentrations of hydrocarbon constituents in all wells are <br /> consistent with previous results <br /> A vapor extraction and treatment system is operating on site. Groundwater extraction and <br /> treatment is expected to begun in the spring or summer of 1992 <br /> If you have any questions about this quarterly report, please contact me at (916) 444-0123 <br /> Sincerely, <br /> BRO CAL CONSULTANTS <br /> GRED r,�r. <br /> K..,�c•��J(r <br /> 4 <br /> /\r <br /> • GHJ r � � �! <br /> J cas R <br /> Project Manag <br /> JL.SP.mkw <br /> Enclosures <br /> cc Mr Gordon Boggs, California Regional Water Quality Control Board, <br /> Central Valley Region <br /> Ms. Laurie Cotulla, San Joaquin County Local Health Distract <br /> Mr Chris Wmsor, ARCO Products Company <br /> Brown and Caldwell 673AREP0RTTTEB92QrRAYr <br /> Consultants <br />