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F' <br /> .y <br /> Mr. Chuck Cannel <br /> December 20, 1991 <br /> Page h <br /> 1� from well ATR-8 was analyzed for BF-TX by EPA Method '8020 and for <br /> '1'lte soil sample analyses .ue summarized in Table 3. <br /> 'I -G by EPA Method 8011). All ,oil laboratory <br /> L•_tbaratory reports far soil samples are to Exhibit C. The BETX constituent concentration <br /> ,nap from the September 24, 1991, iluarterly monitoring is included as Figure 4. <br /> Table 3. Laboratory Analysts of Soil Sarnples, <br /> ARCO Station .7093, Tracy, <br /> nia <br /> Total xyiencs. TPH-G, <br /> i3enzene. >rthvlbenzene, loluenc, llg. mglkg <br /> well number Date <br /> sampled ug/kg pg/kg <br /> lb�S <br /> Rcporring2,5 3.5 1'0 <br /> Detection Linlir 5 2.S ND S5 16 <br /> 8121191 78 <br /> ATR-8,8 feet bgs 92 ND 89 7.0 <br /> stockpile 7/24/91 ND <br /> ND =not detected, <br /> had detect'a <br /> levels of ben2:ene, <br /> As Table 2 indicates,groundwater from off-site ATR-1 ATR-Thad no dete cable levels of BETX <br /> total xylenes,and TPH-G• Groundwater from well <br /> and TPH-G. <br /> i <br /> Soil samples analyzed from borehole ATR-8 and from the stockpile show detectable amounts <br /> of ethylbenzene, total xylenes, and TPH-G. <br /> Discussion <br /> The data collected from this investigation indicate the following: <br /> 1. Groundwater containing hydrocarbon constituents exists in the vicinity of ATK-8. <br /> 2. The absence of hydrocarbon components in the water sample collected from Ml'V-11 <br /> indicate that the hydrocarbons have not migrated west of the station. <br /> 3. Hydrocarbon components exist in the capillary fringe zone in the vicinity of ATR-8. <br /> . - �7Kn�COItRF51'a,`?�3o.L77t <br /> gown and Caldwell <br />