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enviroso <br /> Chromium, nickel, and zinc were detected in ground water samples from Boring SB-2 at <br /> concentrations below State of California MCLs VOCs and SVOCs were detected in the <br /> ground water sample from SB-2 (51 ppb dichloroethane, 390 ppb 2-methylnaphthalene, <br /> and 350 ppb naphthalene) <br /> MTBE was detected in ground water samples from Borings SB-1, SB-2, SB-4, and SB-5 <br /> by EPA Method 8020 at concentrations ranging from 110 to 370 ppb An MTBE <br /> confirmation analysis performed by EPA Method 8260 on the ground water sample <br /> containing 370 ppb MTBE (by 8020) was found to contain ND (<50 ppb) levels of MTBE <br /> 5.0 CONCLUSIONS <br /> Concentrations of TPPH, TEPH, and BTEX were detected in soil and ground water <br /> samples from each of the five borings Although MTBE was detected in soil and ground <br /> water samples analyzed by EPA Method 8020, since these detections were not confirmed <br /> by EPA Method 8260 analysis, it appears that these detections are false positives <br /> Additional site investigation activities will be proposed for off-site areas to assess the extent <br /> of petroleum hydrocarbons in soil and ground water <br /> If you have any questions regarding the contents of this document, please call <br /> Sincerely, <br /> Enwros, Inc <br /> Joe W Neel <br /> Projec Geologist <br /> �QP�IE Ssl0,y9! <br /> Diane M Lundquist E 4 <br /> Senior Engineer NO C46725 <br /> C46725 <br /> OF CAI�E4�`� <br /> 407 5 <br />