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is <br /> Brown and Caldwell <br /> Buronsultants <br /> lC� <br /> 7211 Street <br /> Sacramento <br /> rahfornia 95854 7092 � f� <br /> ;9161 444 0123 <br /> rkV 1916}444 8437 <br /> February E6 1993 FESr <br /> ENVIR0NIVIFNT.',L HEALTH <br /> PER f"f IT/SER��lCES <br /> Mr Chuck Cannel <br /> ARCO Products Company <br /> Post Office Box 5811 <br /> San Mateo California 94402 017-6732-(}411 <br /> Subject Fourth Quarter 1992 Report for ARCO Station 2093, <br /> 3425 Tracy Boulevar Tracy. California: <br /> Pilot Program Sit�41 <br /> 7—W <br /> Dear Mr Carmel <br /> This report presents water level measurements and results of groundwater sampling performed <br /> during the fourth quarter of 1992 at ARCO Products Company (ARCO) Station 2093, located <br /> at 3425 Tracy Boulevard in Tracy, California. Site location is shown on Figure 1 Fieldwork <br /> was performed by Emcon Associates on October 7 and 8, 1992. This report was prepared <br /> under Task Order 7093-92-5A There are seven on-site wells (ATR-1 through ATR-7) and <br /> five off-site wells (ATR-8 through ATR-12), as shown on Figure 2. Six of the on-site wells <br /> and all of the off-site wells were sampled. One on-site well (ATR-3) was not sampled <br /> because it contained floatmg product <br /> Field and Analytical Methods <br /> Emcon Associates personnel measured depth-to-water and product thickness (if present), <br /> purged each well to be sampled, and collected groundwater samples at the site Depth-to- <br /> water measurement and a check for floating product were made prior to commencing purging <br /> Prior to sampling, the wells were purged of a minimum of three well volumes or until <br /> evacuated using a centrifugal pump After purging, each well was sampled using a Teflon <br /> bailer All groundwater samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPH-G), and for benzene, ethylbenzene toluene, and xylenes (BETX)by U S Environmental <br /> Protection Agency (EPA) Method 5030/8020/DHS LUFF Field data sheets and the chain-ot- <br /> custody form are included in Exhibit A <br /> Results <br /> The general groundwater tlow beneath the site on October 7 1992 was to the north-northeast <br /> under an average hvdraulic gradient of 0 002 (Figure 3) A summary of depth-to-water <br /> 146 measurements and calculated groundwater elevations is presented in Table 1 Table 2 lists <br /> past and present groundwater tlow directions and hydraulic gradients for this site <br /> 67324REP0RTSS0[T92QTRRVr <br />