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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364 9233 <br /> 15) 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 Industriai Road San Carlos CA 94070 4111 (650) 232-9600 FAX(650) 232 9612 <br /> Sequoia- Petaluma Project Scott Forbes Sampled 3/2/99 to 313/99 <br /> 1455 N McDowell Blvd Suite D Project Number P903293(ATC) Received 3/15/99 <br /> Petaluma CA 94954 Project Manager Scott Forbes Reported 3/19199 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-San Carlos <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> JAnalyte Analyzed Level Result Result Units Recov Limits % Liimt % Note* <br /> Batch 9030057 Date Prepared 3/16199 Extraction Method EPA 50308 1PIT1 <br /> Blank 9030057-BLKI <br /> 1,2-Dibromoethane 3/16/99 ND ug/kg 100 <br /> UI 2-Dichloroethane <br /> r, ND 100 <br /> -,sopropvl ether ND 100 <br /> Ethyl tert-butyl ether ND 100 <br /> Methyl tert-butyl ether ND 100 <br /> tert-amyl methyl ether ND 100 <br /> ert-butyl alcohol ND 5000 <br /> Surrogate 12-Drchloroethane-d t 2500 2930 700-121 117 <br /> Furrogate Toluene-d8 2500 2730 810-117 109 <br /> L CS 9030057-BSI <br /> Methyl tert-butyl ether 3/16/99 2500 2790 ug/kg 700-130 112 <br /> birogare <br /> rogate 12-Drchloroethane-d4 2500 3010 700-121 120 <br /> Toluene-d8 2500 2840 810-117 114 <br /> Matrix Spike 9030057-MSI L903113-05 <br /> Methyl tert-butyl ether 3116199 2500 ND 2400 ug/kg 700-130 960 <br /> Surrogate 12-Drchloroethane-d4 2500 2590 70 0-121 104 <br /> Surrogate Toluene-d8 2500 2470 810-117 988 <br /> Matrix Spike Dup 9030057-MSD1 L903113-05 <br /> Methyl tent-butyl ether 3/16199 2500 ND 2540 ug/kg 700-130 102 25 0 606 <br /> Surrogate 1 2-Dichloroethane-d4 2500 2700 700-121 108 <br /> 'Surrogate Toluene-d8 2500 2540 810-117 102 <br /> 1 <br /> 1 <br /> uoia Analytical-San Carlos *Refer to end of report for text of notes and definrtionv <br /> 1 Page 14 of 15 <br />