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QSequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs corn <br />ler Ryan Inc -Dublin Protect Chevron <br />6747 Sierra Court Suite 3 Protect Number Chevron if 9-5775 Reported <br />DubllnCA 94568 Project Manager Scott Polston 09 -May -00 I 1 21 <br />Total Purgeable Hydrocarbons (C6 -C12), BTEX and MTBE by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creep <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Votes <br />Batcl10E08003 - EPA 5030B [P/TJ <br />288 <br />300 <br />Blank (OE08003-BLKI) <br />96 0 <br />70 -!Ju <br />Prepared & Analyzed 08 -May -00 <br />Purgeable Hydrocarbons <br />ND <br />50 ugll <br />Prepared & Analyzed 08 -May -00 <br />Benzene <br />ND <br />050 <br />165 <br />Toluene <br />ND <br />0 50 <br />825 <br />Ethylbenzcne <br />ND <br />050 <br />Toluene <br />%ylenes (total) <br />ND <br />050 <br />ND <br />Methyl tent-butvl ether <br />ND <br />25 <br />Surrogate a a,a-Tr+Jluorotoluene <br />29 7 <br />050 <br />300 990 70-130 <br />LCS (OE08003-BSI) <br />880 <br />70.130 <br />Prepared & Analyzed 08 -May -00 <br />Benzene <br />170 <br />050 ugli <br />200 850 70-130 <br />Toluene <br />192 <br />050 <br />200 910 70-130 <br />Ethylbenzene <br />193 <br />050 <br />200 965 70-130 <br />I& (total) <br />578 <br />050 <br />600 963 70-130 <br />JWGgaie 44a-Tnfluarololuene <br />288 <br />300 <br />96 0 <br />70 -!Ju <br />Matrix Spike (OE08003-MSI) <br />Source W0050t1-02 <br />Prepared & Analyzed 08 -May -00 <br />Benzene <br />165 <br />050 ugl! <br />200 <br />ND <br />825 <br />70.130 <br />Toluene <br />169 <br />050 <br />200 <br />ND <br />845 <br />70-130 <br />Ethylbenzene <br />176 <br />050 <br />200 <br />ND <br />880 <br />70.130 <br />Xylene (total) <br />537 <br />050 <br />600 <br />ND <br />895 <br />70.130 <br />Swrngage <br />281 <br />30.0 <br />917 <br />70-130 <br />Matrix Spike Dup (OE08003-MSDI) <br />Source W005011-02 <br />Prepared & Analyzed 08 -May -00 <br />Benzene <br />185 <br />050 ug/l <br />200 <br />ND <br />92.5 <br />70-130 <br />I 1 4 <br />20 <br />Toluene <br />194 <br />050 <br />200 <br />ND <br />970 <br />70-130 <br />138 <br />20 <br />Ethylbenzene <br />20 1 <br />050 <br />200 <br />ND <br />101 <br />70-130 <br />133 <br />20 <br />Xylenes (total) <br />609 <br />050 <br />600 <br />ND <br />102 <br />70-130 <br />126 <br />20 <br />Surrogate aaa-Tnfluorotoluene <br />311 <br />300 <br />104 <br />70-130 <br />Sequoia Analytical - Walnut Creek The results in this 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 />Page 7 of 11 <br />.#. <br />