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1680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industnal Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> nnacle-C P Prosect ARCO 6020,Manteca,CA Sampled 5/7/99 to 5/11/99 <br /> 3939 Cambridge Road,Ste 220 Project Number NIA Received 5112199 <br /> meron Park,CA 95682 Pro ect Manager Joel Coffman Reported 5127199 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Leh, 9050173 Date Prepared, 5/14/92 _Extraction Method, EPA 5030B [MeOHI <br /> Mmik <br /> 9050)173-BLK1 <br /> Tert-butyl alcohol 5/14/99 ND mg/kg 100 <br /> t-ethy[tert-butyl ether ND 0100 <br /> isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0 100 <br /> rt-amyl methyl ether ND 0 100 <br /> hanol ND 150 <br /> riogate 12-DCA-d4 250 248 600-140 992 <br /> 9050173-BSI <br /> rSthyi tent-butyl ether 5/14199 250 256 mg/kg 700-130 102 <br /> Surrogate 12-DCA-d4 " 250 253 600-140 101 <br /> 9050173-ma 5905165-01 <br /> yi tert-butyl ether 5/14/99 250 ND 247 mg/kg 600-140 988 <br /> Surrogate 12-DCA-d4 " 250 243 600-140 971 <br /> 9050173-MSD15905165-01 <br /> ethyl tert-butyl ether 5/14199 250 ND 233 mg/kg 600-140 932 250 583 <br /> Surrogate 1,2-DCA-d4 250 242 " 600-140 968 <br /> 1 <br /> Ilq <br /> 1 <br /> uoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and def nuions <br /> Wald W Bobel,Client Services Representative Page 9 of 10 <br />