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2S Au it 2004 . , , '. � • ' . ; .' . " '' ._ • '., <br /> , <br /> AGE-NC P.roject"No: 95-0106 • <br />'. Page 3 of 4 <br /> 3.2. ANALYTICAL RESULTS OF GROUND'WATER SAMPLES <br /> TPH=g was;dete' ded at conceritrations.of 3,200 micrograms per liter(µg/1)and 2,500µg11 in samples <br /> ' '.from'wells-MW-L and MW-4;°res ectivel (Figure <br /> BTEX compo unds•were'detected in'wells MW-1 and MW-4 at the,.following.concentrations: <br /> `benzene 270 µg/1 and �ig/1; toluene 120 µg/l and 4.9'µg/1, ethylbenzene.30 µg/l-and 84 µg/l and ' <br /> xylenes 175.µg/l and 38µg/1, respectively. <br /> MTBE was not detected in the ground.water-samples collected this quarter. 1,2=DCA,was detected <br /> at,a concentratioii'of 24 µg/1 in the,groundwater sample'collected from well-MW-J.' <br /> �.,No I-additional.analytes;were detected•at or above-laboratory.,detection limits in.wells-MW-1 and <br /> MW-4. No analytes were detected at or above laboratory detection limits iii wells MW72, MW-3, <br /> �;1W—eMW-5, MW-6. (upper), MW-6 (lower).and MW-7: Analytical results of.,ground' water <br /> samples are summarized in Table 2. The laboratory report'(CTEL Project No CT214-0403204),•' <br /> QA/QC and chain-of-custody are included in Appendix D. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of the site'investigation: <br /> • The ground water flow direction was generally northward on 25-March 2004, at an average <br /> gradient of 0.006 foot/foot. Ground water elevations-increased slightly but continue to flow <br />' in a northerly-directiori. <br /> J r <br /> • ' TPH-g was;detected in groundwater samples.fr'om monitoring well MW-4, located'down- <br />' gradient'off-site-frorrf theformer UST excava#ion; and well MW-1,located.just north of the. <br /> former UST area' <br /> • BTEX compounds were detected in the water samples collected from MW-1 and-MW-4. The <br /> concentrations of benzene in'the ground water samples collected.from `wells'MW-1 and <br /> MW74 exceeds,the,State' of.California maximum contaminant level (MCL) for drinking <br /> water.., <br /> • MTBE was.notdetected in the water samples collected froft the'site this quarter. ' <br /> 1,2-DCA was idetected for the second time•inthe ground%water sample collected from-MW-1, <br /> .n2D A exceeds the MCL for drinking water. <br /> the concentration of 1, - c <br /> _ C , • . . , - g <br /> Advanced GevEnvironmental,Inc. <br /> 1 A, r - F <br />