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1 4 Sequoia <br />X -N Analytical <br />404 N Wlget lane <br />Walnut Creek CA 94598 <br />(925)9W9600 <br />FAX (925) 988-9673 <br />WWW sequoialabs com <br />15ettler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron SS49-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 25 -Apr -00 17 37 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX in Air by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Reault %REC Limits RPD Limit Notes <br />Batch OD21004 - EPA 5030B [P/TJ <br />606 <br />Blank (OD21004-BLKI) <br />LCS (OD21004-BSI) <br />Prepared & Analyzed 21 -Apr -00 <br />Purgeable Hydrocarbons <br />ND <br />2 0 mg/ml Air <br />Benzene <br />ND <br />0 010 <br />Toluene <br />ND <br />0 010 <br />Ethylbenzene <br />ND <br />0 010 <br />Xylenes (total) <br />ND <br />0 010 <br />Surrogate aaa-Tnfluorotaluene <br />606 <br />600 101 70-130 <br />LCS (OD21004-BSI) <br />4J7 <br />CS (OD21004-BS2) <br />Prepared 21 -Apr -0O Analyzed 24 -Apr -00 <br />Benzene <br />1 50 <br />0 010 <br />mg/ml Air 200 75 0 70 130 <br />Toluene <br />162 <br />0 010 <br />200 810 70-130 <br />Bthylbenzene <br />1 57 <br />0 010 <br />200 785 70-130 <br />Xylenes (total) <br />312 <br />0 010 <br />600 853 70-130 <br />gare aaa-tnpuororonuene <br />4Y4 <br />0 U LSL1 /0 -1 -fu <br />4J7 <br />CS (OD21004-BS2) <br />Prepared & Analyzed 24 -Apr -00 <br />Benzene <br />328 <br />0 010 mg/m' Air <br />400 820 70-130 <br />Toluene <br />346 <br />0 010 <br />400 865 70-130 <br />Ethylbenzene <br />358 <br />0 010 <br />400 895 70-130 <br />Xylenes (total) <br />113 <br />0 010 <br />120 942 70 130 <br />Surrogate aaa-Trrf7uorotoluene <br />526 <br />600 877 70-130 <br />LCS Dup (OD21004-BSD1) <br />Prepared 21 -Apr -00 Analyzed 24 -Apr -00 <br />Q-07 <br />Benzene <br />164 <br />0 010 mg/ml Air <br />200 82 0 70-130 8 92 <br />20 <br />Toluene <br />176 <br />0 010 <br />200 880 70-130 828 <br />20 <br />Ethylbenzene <br />2 10 <br />0 010 <br />2 00 105 70-130 28 9 <br />20 <br />Xylenes (total) <br />556 <br />0 010 <br />6 00 927 70-130 824 <br />20 <br />Surrogate aaa-Tnfluorotoluene <br />522 <br />600 870 70-130 <br />Sequoia Analytical - Walnut Creek <br />0 <br />The results in this report apply to the samples analyzed to accordance with the churn of <br />custody document This analytical report must be reproduced in its entrrety <br />RO <br />Page 7 of 10 <br />