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Mr Chuck Carmel <br /> August 11, 1992 <br /> Page 2 <br /> I� <br /> 1992 sampling event Again, wells W-2A and W-2B are not used on contouring since they <br /> are not completed in the same zone as the other wells <br /> Discussion <br /> The direction of groundwater flow at this site continues to be southerly under a gradient of <br /> 0 002 On May 11, 1992, the depth to water ranged from 60 03 feet to 62 98 feet Water <br /> levels have risen an average of 0 35 feet in the monitoring wells since the February 1992 <br /> quarterly sampling event <br /> BETX and TPH-G constituents were not detected in the samples collected from monitoring <br /> wells W-2A, W-2B, W-5, W-6, and W-8 Samples from morutormg wells W-IA, W-7, W-9, <br /> and W-11 show three or more BETX and/or TPH-G constituents to be nondetectable, with the <br /> remaining constituent concentrations decreasing since the February 1992 quarterly sampling <br /> Ethylbenzene, toluene, and total xylenes concentrations in wells W-10 and W-12 were not <br /> detected or were found in concentrations only slightly higher than the detection limit <br /> Benzene and TPH-G concentrations in wells W-10 and W-12 have increased since February <br /> 1992 All analyzed constituents in well W-3 have increased since February 1992 <br /> Monitoring of the wells will continue through 1992 A vapor extraction and treatment system <br /> is operating on site A groundwater extraction and treatment system has been designed and <br /> a contractor is being selected for construction of the system <br /> Please contact me or Ms Wendy Lmck at (916)444-0123 if you have any questions regarding <br /> this quarterly report, <br /> Very truly yours, <br /> BROWN AND CALDWELL CONSULTANTS <br /> 4JayLucis, R G #4301 <br /> Project Manager <br /> JL WL 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 District <br /> Mr Chris Winsor, ARCO Products Company <br /> Brown and Caldwell 6731\REPORMMAY92QrPRR" <br /> Cons_ ants <br />