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A 404 N Wjget Lane Sequoia Walnut Creek C94548 4 (925)988 8-4600 i FAX(925)988-9673 Analytical www sequolalabs com Gettler Ryan,Inc -Dublin Project Chevron 6747 Sierra Court Suite J Project Number Chevron#9-6171 Reported Dublin CA,94568 Project Manager Deanna L Harding 31-Jul-01 07 59 Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT Sequoia Analytical - Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW 7(W107262-07)Water Sampled 12-Jul-01 13 29 Received 13-Jul-01 17 35 Purgeable Hydrocarbons 220 50 ugA 1 1G20003 24-Jul-01 24-Jul-01 EPA D-06 8015M/8020 Benzene ND 050 Toluene ND 050 " Ethylbenzene ND 050 Xylenes(total) ND 050 Methyl tert-butyl ether ND 25 " Surrogate a aa-Trilluorotoluene 165% 70-130 " S-04 MW 8(W107262-08)Water Sampled 12-Jul-011536 Received 13-Jul-01 17 35 Purgeable Hydrocarbons ND 50 ugA 1 1G20003 25-Jul-01 25-Jul-01 EPA 8015M/8020 Benzene ND 050 " Toluene ND 050 " benzene ND 050 Nq%nes(total) ND 0 50 " Surrogate a,a,a-Trifluorotoluene 103% 70-130 " MW 8(W107262-08R)E1)Water Sampled 12-Jul-01 15 36 Received 13-Jul-01 17 35 Methyl tert-butyl ether 1200 50 ug/I 20 1G20003 24-Jul-0I 24-Jul-01 EPA zCC-3 8015M/8020 Surrogate a,a,a-Trrfluorotoluene 947% 70-130 " MW 9(W107262-09)Water Sampled 12-Jul-01 1109 Received 13-Jul-01 17 35 Purgeable Hydrocarbons ND 50 ugA 1 IG20003 24-Jul-01 24-Jul-01 EPA 8015M/8020 Benzene ND 050 " Toluene ND 050 Ethylbenzene ND 050 " Xylenes(total) ND 0 50 " Methyl tert-butyl ether ND 25 Surrogate a,a,a-Triuorotoluene 953% 70-130 m analyzed ola Analytical-Walnut Creek The results in thrs report Reply to the samples lyz to accordance with the chain of custody document 77its analytical report must be reproduced in its entirety Page 4 of 18