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" 680 Chesapeake DrNe Redwood Clty A 94063 (650)3649600 FAX(650)364-9233 <br /> a 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Sequoi <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 Industrial Road San Carlos CA 9407G-41 11 (650)232-9600 FAX(650)232-9612 <br /> f• <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3/I0199 to 3111199 <br /> 9912 Business Park Drive,Ste 100 Protect Number N/A Received 3112199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 3126199 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX andWTBEyby DHS LUFTIQuality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalytc Analyzed Level Result Result Units Recov Limits % Limit % Notes <br /> Matrix Spike(coutrn ,rued) 9030306-MS1 5903287-01 <br /> Xylenes(total) 3123199 300 ND 308 ug/1 600-140 103 <br /> Methyl tert-butyl ether 100 ND 132 600-140 132 <br /> Surrogate a,a a-Tri luorotoluene 100 911 600-140 911 <br /> Matrix Spike Dun 2030306-MSDI S903287-01 <br /> Benzene 3123199 10 0 ND 836 ug/l 600-140 83 6 250 6 26 <br /> Toluene 100 ND 109 600-140 109 250 3 60 <br /> Ethylbenzene 100 ND 835 600-140 835 25 0 838 <br /> Xylenes(total) 300 ND 28 6 600-140 95 3 25 0 777 <br /> Methyl tert-butyl ether 100 ND IS 5 600-140 155 250 160 4 <br /> Surrogate a a a-TriJluorotoluene 10 0 824 600-140 82 4 <br /> —Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> a .5 <br /> Sandra R Hanson,Client Services Representative Page 10 of I 1 <br />