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a) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pacific Environmental Group-Sac Project Chevron 9-9840,Stockton,CA Sampled 9/22/98 <br /> 11315 Sunrise Gold Circle St M Project Number 920-122 1C Received 9122/98 <br /> Rancho Cordova,CA 95742 Project Mana er Tim Anenson Reported 9/23/98 <br /> Volatile Organic Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes' <br /> Ratf,b. B09021 Date Prepared. 9/22/98 Extraction Method. EPA 5030B [MeOHI <br /> Blauk 8090214-13LKl <br /> Ethanol 9/22198 ND mg/kg 150 <br /> Tert-butyl alcohol ND 100 <br /> Methyl tert-butyl ether ND 0 100 <br /> D1-isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0 100 <br /> Tert-amy] methyl ether ND 0 100 <br /> Surrogate 12-DCA-d4 250 2 53 " 600-140 101 <br /> LCS 8090214-BS1 <br /> Methyl tert-butyl ether 9/22/98 2 50 239 mg/kg 700-130 95 6 <br /> Surrogate 1 2-DCA-d4 " 250 190 600-140 760 <br /> yl tert-butyl ether 9/22198 250 1 65 mg/kg 700-130 660 366 1 <br /> arrogate 1,2-DCA-d4 250 2 15 If 600-140 860 <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> in a C Schneider,Laboratory Director Page 5 of 6 <br />