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1Ir. Chuck C�umel <br /> December 20, 1991 <br /> Page b <br /> Groundwater Sampling <br /> e laboratory <br /> ts are <br /> Groundwater samples were collected fromrATR—le,uId r Tcollectedlape'r developinentlusing, <br /> discussed later in this report. Groaninilliliter Rl tss vials to minimize <br /> disposable bailers. Samples were carefully transferred <br /> samto ple,j Teflon-lined cap(septa)was <br /> aeration of the samp <br /> les. To assure the integ y p <br /> placed on each vial, anto NET Pacific Laboratories <br /> d each vial was inspected to ensure the absence of air bubbles. c <br /> sealed samples were placed in a cold ice chest and transported <br /> under proper chain-of-custody procedures. <br /> Surveying <br /> were surveyed <br /> On F.ugust 22, 1991, both off-site groundwater monit0Elevaons werer1r1g N' stied to known levationsgof <br /> Inc., for horizontal and vertical components. <br /> several on-site monitoring wells and other previously surveyed points. <br /> ANALYTICAL RESULTS <br /> results from the soil and groundwater samples submitted <br /> Tltis section presents the analyticalT Pacific laboratory, <br /> during this investigation. All groundwater samples were submitted to NE <br /> a California state certified laboratory,for analysis of benzene,ethylbe jetnhodo8020,,and total <br /> b U.S. Environmental Protection Agency (EPA) <br /> xylenes (BETX) Y TPH-G) by EPA Method 8015. i able 2 summarizes <br /> petroleum hydrocarbons as gasoline <br /> ons <br /> the September 24, 1991,quarterly monttonrtg are included <br /> groundwater laboratory results. The laboratory report is in)lxlubtt C. Water-level r ing a a evauded <br /> and groundwater flow direction forP <br /> as Figure 3. <br /> Table 2. Laboratory Analvses of Groundwater Samples, <br /> ARCO Station 2093,Tracy, California <br /> Eth benzene, Toluene, Total Xylenes, TYH-G, <br /> Well number Date Benzene. Y ug/t Pg mg/l <br /> sampled Pgll Pg1l <br /> ---- -105 <br /> Reporting p 5 0.5 ti <br /> Derecrinn Limir 98 2.7 <br /> —�---� 130 ND ND <br /> ATR-88125191 11U ND ND ND <br /> -- 8127191 . Nth <br /> ND = not detected. <br /> 499\COg-R SF-98b.30.17R <br /> Brown and Caldwell <br /> C::rsa��art <br /> ,�..�� �.n®�wrmxnu�nmi�ramn�semniee�e <br />