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Brown and Caldweil <br /> Consultants <br /> r , <br /> 723 Street r <br /> Sacramento � <br /> Cahfomia 9581:7092 J d 1_ <br /> (916)444 0123 MAY 1 ' W2 <br /> FAX{91 6)444 a.37 <br /> May 12 1992 ENVIRONNIFI TAL HEALTH <br /> PERMIT/SERVICES <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-5732-04/1 <br /> Subject. First Quarter 1992 Report for ARCO Station 2093, 3425 Tracy <br /> Boulevard, Tracy, California: Pilot Program Site 1416 <br /> Dear Mr Carmel <br /> This report presents quarterly water levels and analytical results of groundwater sampling <br /> performed at ARCO Products Company (ARCO) Station 2093, located at 3425 Tracy <br /> Boulevard in Tracy, California on January 23, and 24, 1992 A site location map is shown <br /> on Figure 1 There are seven on-site wells (ATR-1 through ATR-7) and five off-site wells <br />. (ATR-8 through ATR-12), as shown on Figure 2 Five of the on-site wells and all of the off- <br /> site wells were sampled Two on-site wells were not sampled because one contained floating <br /> product (AT-3) and another was not accessible (AT-7) <br /> Field and Analytical Methods <br /> Emcon Associates personnel measured depth-to-water levels,purged each well, and collected <br /> groundwater samples at the site Static water levels were measured prior to commencing <br /> purging, and a check for floating product was also made at this time A summary of the <br /> groundwater measurements is presented in Table 1 <br /> Prior to sampling, the wells were purged of a minimum of three well volumes using a <br /> centrifugal pump or bailer After purging, each well was sampled using a Teflon bailer All <br /> groundwater samples were analyzed for total petroleum hydrocarbons as gasoline ('IPH-G), <br /> and for benzene,ethylbenzene,toluene,and xylenes(BETX)by U S Environmental Protection <br /> Agency (EPA) Method 5030/8020/DHS LUFT <br /> Results <br /> Based on the water levels measured on January 23, 1992, the general groundwater flow <br /> direction beneath the station is to the north under a hydraulic gradient of approximately 0 002 <br /> (Figure 3) Table 2 presents the groundwater flow direction and hydraulic gradient data from <br /> previous monitoring periods <br /> Analytical results of groundwater samples are summarized in Table 3, along with previous <br /> results The complete laboratory report for the sampling event is presented in Exhibit B <br /> 6732 W3P0RTSVAN92QTRJkVr <br />