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Sequoia <br />Analytical <br />404 IN Wlget Lane <br />Walnut Creek Coq 94598 <br />(925) 988-9600 <br />FAX (925) 98&9673 <br />www sequoialabs corn <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite 3 Project Number Chevron SSN9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 25 -Apr -00 17 37 <br />Total Purgeable Hydrocarbons (C6 -C12) and BTEX by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />lnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD21002 - EPA 5030B [PIT] <br />Blank (OD21002-BLKI) Prepdred & Analyzed 21 -Apr -00 <br />Purgeable Hydrocarbons ND 50 ug/l <br />Benzene ND 050 <br />Toluene ND 050 " <br />Ethylbenzene ND 0 50 <br />\ylenes (total) ND 0 50 <br />Surrogate aaa-Trnfluorotoluene <br />287 <br />300 957 70-130 <br />LCS (OD21002-BSI) <br />Prepared & Analyzed 21 -Apr -00 <br />Benzene <br />171 <br />050 ug/1 <br />200 85 5 70-130 <br />Toluene <br />179 <br />050 <br />200 895 70-130 <br />Ethylbenzene <br />186 <br />050 <br />200 930 70-130 <br />Xvlenes (total) <br />561 <br />050 <br />600 93 5 70-130 <br />Surrogate a4za-Tri luorotoluene <br />281 <br />300 93 7 '70-130 <br />Matrix Spike (OD21002-MSI) <br />Source W004227-03RE I Prepared& Analyzed 21 -Apr -00 <br />Benzene <br />181 <br />050 ug/l <br />200 ND 905 70-130 <br />Toluene <br />193 <br />050 <br />200 ND 965 70-130 <br />Ethylber¢eno <br />198 <br />050 " <br />200 ND 99 0 70-130 <br />Xylenes (tolyl) <br />592 <br />0 50 " <br />600 ND 987 70-130 <br />Smrogau ata-TrtJlttorotohrene <br />2&9 <br />3d O 96 3 70.130 <br />Matrix Spike Dup (OD21002-MSD1) <br />Source W004227-03RE I Prepared& Analyzed 21 -Apr -00 <br />Bamew <br />1&9 <br />050 ugll <br />200 ND 945 70-130 <br />4.32 <br />20 <br />Toluene <br />198 <br />050 <br />200 ND 990 70-130 <br />2 56 <br />20 <br />Ethytbenzene <br />197 <br />050 <br />200 ND 985 70-130 <br />0 506 <br />20 <br />Xylenes (total) <br />587 <br />050 <br />600 ND 97 8 70-130 <br />0 848 <br />20 <br />Surrogate gat TnfTuorotoluene <br />306 <br />300 102 70-130 <br />Sequoia Analytical - Walnut Creek The results m thFs report apply to the samples analyzed to accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />0 <br />Page 6 of 10 <br />0*. <br />