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Sequoia <br />Analytical <br />404 N WISet lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corn <br />Gettler Ryan, Inc -Dublin Project Cheaper <br />6747 Sierra Court Suite J Project Number Chevron 4 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 12 -Apr -00 11 36 <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 />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD] 1002 - EPA 5030E [P/TJ <br />Blank (OD11002-BLKI) <br />Prepared & Analvzed I 1 -Apr -0O <br />Purgeable Hydrocarbons <br />ND <br />50 <br />ug/l <br />Benzene <br />ND <br />0 50 <br />" <br />Toluene <br />ND <br />050 <br />Ethylbenzene <br />ND <br />0 50 <br />" <br />lylenes (total) <br />ND <br />0 50 <br />" <br />Surrogate aaa•Trii luorotolueire <br />312 <br />300 104 70.130 <br />LCS (OD I 1002 -BSI) <br />Prepared & Analyzed I1 -Apr -00 <br />Benzene <br />1159 <br />050 <br />ug/1 <br />200 845 70 130 <br />Toluene <br />180 <br />0 50 <br />200 9130 70-130 <br />Ethylbenzene <br />165 <br />050 <br />200 825 70 130 <br />Xylenes (total) <br />573 <br />0 50 <br />600 95 5 70.130 <br />Surrogate a a a-TriJluorotoluene <br />271 <br />300 903 70-130 <br />Matrix Spike (OD11002-MSI) <br />Source W004026-09 <br />Prepared & Analyzed l l -Apr -00 <br />Benz= <br />178 <br />0 50 <br />ug/1 <br />200 ND 89 0 70-130 <br />Toluene <br />ISE <br />050 <br />200 ND 940 70-130 <br />mylberizene <br />178 <br />0 50 <br />200 ND 89 0 70.130 <br />Xylenes (total) <br />596 <br />0 50 <br />600 ND 993 70-130 <br />Surrogate aao-Tnfhtorotohtent <br />261 <br />300 870 70-130 <br />Matrix Spike Dup (OD 11002-MM1) <br />Source W004026-89 <br />Prepared & Analyzed 11 -Apr -00 <br />Benzene <br />17 5 <br />050 <br />ug/i <br />200 ND 875 70-130 <br />170 20 <br />Toluene <br />173 <br />0 50 <br />200 ND 865 70-130 <br />831 20 <br />Ethylbenzene <br />192 <br />050 <br />" <br />200 ND 910 70.130 <br />222 20 <br />Xylenes (total) <br />58.9 <br />050 <br />600 ND 982 70-130 <br />1 18 20 <br />Surrogate sao-Tri luorotoluene <br />295 <br />300 850 70.130 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entire* <br />Page 7 of 12 <br />i#. <br />