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1 4 Sequoia <br />5�_N Analytical <br />1 <br />404 N Wiget Lane <br />Walnut Creek, CA 94598 <br />(925) 988-96M <br />FAX (925) 988-9673 <br />Gettler Ryan, In(, -Dublin. Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Barbara Siemmski 05 -Jan -00 10 22 <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 />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 9L31002 Prepared 31 -Dec -99 <br />Using EPA 5030B [MeOH] <br />Blank (9L31002-BLK1) <br />mg/kg <br />0 800 <br />Purgeable Hydrocarbons <br />ND <br />10 mg/kg <br />Benzene <br />ND <br />00050 " <br />Toluene <br />ND <br />00050 " <br />Ethylbenzene <br />ND <br />00050 " <br />Xylenes (totdi) <br />ND <br />00050 " <br />Methyl tent -butyl ether <br />ND <br />0 050 <br />Surrogate a a a-Tn,Jluorotolueue 0 762 " 0 600 127 40-140 <br />LCS (9L31002 -BS 1) <br />Benzene <br />0 798 <br />00050 <br />mg/kg <br />0 800 <br />997 <br />50-150 <br />Toluene <br />0 802 <br />00050 <br />0 800 <br />100 <br />50-150 <br />Ethylbenzene <br />0 808 <br />00050 <br />0 800 <br />101 <br />50-150 <br />Xylenes (total) <br />2 48 <br />00050 <br />240 <br />103 <br />50-150 <br />Methyl tent -butyl ether <br />0 614 <br />0 050 <br />0 800 <br />768 <br />50-150 <br />Surrogate a a a-Tnfluororoluene <br />0 638 <br />0 600 <br />106 <br />40-140 <br />Matrix Spike (9L31002 -MSI) <br />Source <br />W912522-12 <br />Benzene <br />0 954 <br />00050 <br />mg/kg <br />0 800 <br />ND <br />119 <br />50-150 <br />Toluene <br />0 956 <br />00050 <br />0 800 <br />ND <br />119 <br />50-150 <br />Ethylbenzene <br />0 958 <br />00050 <br />0 800 <br />ND <br />120 <br />50-150 <br />Xylenes (total) <br />290 <br />00050 <br />240 <br />ND <br />121 <br />50-150 <br />Methyl Cert-btnvi ether <br />0 926 <br />0 050 <br />0 800 <br />014 <br />982 <br />50-150 <br />Surrogate a a a-Tnfluorololuene <br />0 682 <br />0 600 <br />114 <br />40-140 <br />Matrix Spike Dup (9L31002-MSD1) <br />Source <br />W912522-12 <br />Benzene <br />0 934 <br />00050 <br />mg/kg <br />0 800 <br />ND <br />117 <br />50-150 <br />2 12 <br />20 <br />Toluene <br />0 942 <br />00050 <br />0 800 <br />ND <br />118 <br />50-150 <br />148 <br />20 <br />Ethylbenzene <br />0 942 <br />00050 <br />0 800 <br />ND <br />118 <br />50-150 <br />168 <br />20 <br />Xylenes (total) <br />280 <br />00050 <br />2 40 <br />ND <br />117 <br />50-150 <br />3 51 <br />20 <br />Methyl tent butyl ether <br />0 880 <br />0 050 <br />0 800 <br />014 <br />925 <br />50-150 <br />509 <br />20 <br />Surrogate a a a-Trrr luorotoluene <br />0 676 <br />0 600 <br />113 <br />40.140 <br />Sequoia Analytical - Walnut Creek The results on this report apply to the semples analyzed en accordance with the churn of <br />custody document This analytical report must be reproduced nn r u er>rrre0 <br />�� <br />A an emp, a story erector page 13 of 15 <br />