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+ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N W+get 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)921-0 100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> ame Tech Services(Chev) Project Chevron <br /> 1690 Rogers Avenue Project Number Chevron 4 9-4275 Reported <br /> San Jose CA,95112 Project Manager Chnstine Lillie 29-Sep-99 ]U 59 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 9123009 Prepared 2l-Sep-99 Using EPA 5030B [P/T] <br /> Blank(9123009-BLK1) <br /> Purgeable Hydrocarbons ND 50 ugl] <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 25 <br /> Surrogate a a a-Tr fuorotoluene 291 300 970 70-130 <br /> LCS(9123009-BSI) <br /> Benzene 197 050 ugll 200 995 70-130 <br /> Toluene 173 050 200 865 70-I30 <br /> *.-7e,t,.e,) 18 3 0 50 20 0 915 70-130 <br /> (to597 050 600 995 70-130 <br /> Surrogate a a a-Tr7ftuorotoluene 286 300 953 70-130 <br /> Matrix Spike(9I23009-MSI) Source W909385-06 <br /> Benzene 182 050 ugll 200 ND 91 0 70-130 <br /> Toluene 167 0 50 200 ND 83 5 70-130 <br /> Ethylbenzene 168 050 200 ND 840 70-130 <br /> Xylenes(total) 560 0 50 600 ND 933 70-130 <br /> Surrogate a a a-Tnfluorotoluene 271 " 300 903 70-130 <br /> Matrix Spike Dup(9123009-MSD1) Source W909385-06 <br /> Benzene 188 0 50 ug/l 200 ND 940 70-130 3 24 20 <br /> Toluene 172 0 50 200 ND 860 70-130 295 20 <br /> Ethylbenzene 179 0 50 200 ND 890 70-130 578 20 <br /> Xylenes(total) 59 1 050 600 ND 985 70-130 5 39 20 <br /> Surrogate a a a-Trifiuorotoluene 272 300 907 70-130 <br /> Sequoia Analytical-Walnut Creek Theresulis in rias reportapply to the samples analyzedina'cordmrcewith the ch2inof <br /> 6VALcustody document This analytical report mus!be reproduced rn ris entrrery <br /> }. <br /> Me 1SSd re vcr, Project Minager Page 6 0l 8 <br />