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Sequoia �°Ch�� e Drive Redwood City CA 94063 (6:0)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite B Sacramento CA 95834 (916)921-9600 FAX(916)921.0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)79Z 1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070 4111 (650)232-9600 FAX(650)232-9612 <br /> SECOR International Project Chevron 9-6258,Stockton,CA Sampled 4/15/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 70007-018-01 Received 4116199 <br /> Sacramento,CA 95827 Project Manager Roger Hoffmore Reported 4130199 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFTIQualtty Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte <br /> Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch, 9040231 Date Prepared, 4/20/99 Extraction Method. EPA 50306(Prf) <br /> 1312nk 9040231-BLKI <br /> Purgeable Hydrocarbons 4120199 ND ug/l Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 500 <br /> Surrogate a a a-Trifluorotoluene /00 935 600-140 93 S <br /> LCC 9040231-BSI <br /> Benzene 4/20/99 100 983 ug/I 700-130 98 3 <br /> Toluene 100 976 700-130 976 <br /> Ethylbenzene 100 974 700-130 974 <br /> ylenes(total) 300 294 700-130 98 0 <br /> ethyl tert-butyl ether too 11 7 700-130 117 <br /> urrogale aaa-Trlfluorotoluene too 9 91 600-140 991 <br /> Matrix Spike 9040231_ 1 S904240-01 <br /> Benzene 4120/99 too ND 10 2 ug/l 600-140 102 <br /> Toluene 100 ND 993 600-140 993 <br /> Ethylbenzene 100 ND 105 600-140 105 <br /> Xylenes(total) 300 ND 31 3 600-140 104 <br /> Methyl cert-butyl ether 100 ND 226 600-140 NR I <br /> Surrogate a a,a-Trtfluorototi.cr-,r loo 910 600-140 910 <br /> Matrix Spike Duo 9040231-MSD1 S904240-01 <br /> Benzene 4120/99 100 ND 9 71 ug/l 600-140 97 t 25 0 492 <br /> Toluene 100 ND 979 600-140 979 250 142 <br /> Ethylbenzene 100 ND 995 600-140 995 25 0 538 <br /> Xylenes(total) 300 ND 300 600-140 100 25 0 3 92 <br /> Methyl tert-butyl ether too ND 122 600-140 122 25 0 598 2 <br /> Surrogate a a,a-Trifluorotoluene too 932 600 140 93 2 <br /> q iota A„aiyti..ai-Sacramento *Refcr to er,d of report for text of nole5 and aefuutrons <br /> Sandra �aso,, �1,,,trvices Representativc Page 8 of 14 <br />