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Redwood City 94063 (650),364-9600 FAX{550)364-97-33 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Sequoia "es"' <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 455 McDoweti Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical ',551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> SECOR Intemational Project Chevron 9-6258,Stockton,CA Sampled 4/6/99 to 417199 <br /> 9912 Business Park Drive,Ste 100 Project Number 7GO07-018-01 Received 4/8199 <br /> Sacramento,CA 95827 Project Manager Roger Hoffmore Reported 4122199 <br /> Total Purgeable Hydrocarbons (C6-C12)and BTEX by DHS LUFT/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 % Lima % Notes' <br /> LCS(coatlnuedl 9040169-BSI <br /> Ethylbenzene 4115199 0200 0 217 mglkg 700-130 108 <br /> Xylenes(total) 0 600 0 585 700-130 975 <br /> Surrogate a a a-Trifluorotoluene 0200 0207 600-140 103 <br /> Matrix Spike 9040169--Ml S904159-20 <br /> Benzene 4/15199 0200 ND 0 187 mg/kg 600-140 935 <br /> Toluene 0200 ND 0 198 600-140 990 <br /> Ethylbenzene 0200 ND 0 198 600-140 990 <br /> Xylenes(total) 0 600 ND 0 538 600-140 897 <br /> Surrogate a a a-Trifluorotoluene 0200 0 197 600-140 985 <br /> Atrix Spike,Dup 2040169-MSD1 5404159-20 <br /> Benzene 4115199 0200 ND 0 191 mg/kg 600-140 955 250 2 12 <br /> Toluene 0200 ND 0 193 600-140 965 250 256 <br /> thylbenzene 0200 ND 0202 600-140 101 25 0 200 <br /> ylenes(total) 0 600 ND 0 549 600-140 915 25 0 199 <br /> Surrogate aaa-Trifluorotoluene 0200 0206 600-140 103 <br /> IqIWquu,,i Anal,tr,a,-Sacramento "Refer I.)end-report Jor text of notes and deft ations <br /> iCl i !� / •tf> >� <br /> Andra R Hanson,Client Services Representative Page 18 of 23 <br />