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Brown and Caldwell <br /> Consultants <br /> !rr <br /> 723 5 Street <br /> Sacramento <br /> Uffomia 95814 7092 <br /> (9161444 0123 <br /> FAX(916)444 8437 <br /> May 28, 1992 JUN <br /> rr <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-6746-04/1 <br /> Subject 1992 First Quarterly Report for ARCO Station 2133, <br /> 2908 Benjamin Holt Drive, Stockton, California <br /> Dear Mr Carmel <br /> This report presents the first quarterly water levels and analytical results of groundwater <br /> sampling performed at ARCO Products Company (ARCO) Station 2133 located at 2908 <br /> Benjamin Holt Drive in Stockton, California. The sampling was performed on January 22, <br /> 1992, by Emcon and Associates (Emcon) This report was prepared under Task Order <br /> 2133-92-5 There are fifteen on-site wells. E-2 through E-12, PR-1, PR-2, BHD-1, and <br /> BHD-2 (Figure 1) Although all of the wells were scheduled to be sampled during this <br /> sampling event, four(E-3, E-5, E-6, and E-9) of the fifteen wells were dry or did not recharge <br /> enough for sampling after purging Therefore, a total of 11 wells were sampled. The most <br /> likely cause of some of the wells located near the extraction well going dry is the operation <br /> of the groundwater extraction system <br /> Field and Analytical Methods <br /> Emcon personnel measured depth-to-water levels, supervised purging of each well, and <br /> collected groundwater samples at the site A copy of Emcon's field notes containing the pH, <br /> electrical conductivity, and temperature readings is included as Exhibit A <br /> All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-G) <br /> and benzene, ethylbenzene, toluene, and xylenes (BETX) by Modified U S Environmental <br /> Protection Agency Method 8015/5030/8020 In addition, groundwater samples from wells <br /> E-8, BHD-1, and BHD-2 were analyzed for fecal coliform <br /> Results <br /> The groundwater extraction system at this site has been in operation since June 1991 Since <br /> the start-up, the system has been pumping at a rate of approximately 10 1 gallons per minute <br /> 674e REPMTSUANW QTR.RPT <br />