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Sequoia <br />1%07 Analytical <br />Gettler Rvan, Inc -Dublin Project Chevron <br />6747 Sierra Court Suite I Project Number Chevron # 9-5775 <br />Dublin CA, 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Reported <br />18 -Apr -00 11 39 <br />Reporting Spike Source %REC RPD <br />Analvte Result Limit Units Level Result %REC Limits RPD Limit Motes <br />Batch OD13012 - EPA 5030B [PIT] <br />LCS (OD13012-BS2) <br />Prepared & Analyzed <br />13 -Apr -00 <br />1 1-Dtchloroethene <br />532 <br />20 ugil <br />Soo <br />106 <br />65-135 <br />Benzene <br />568 <br />10 <br />500 <br />114 <br />70 130 <br />Tnchloroethene <br />560 <br />2 0 <br />50 0 <br />112 <br />70-130 <br />Toluene <br />545 <br />2 0 <br />500 <br />109 <br />70-130 <br />Chlorobenzene <br />53 0 <br />2 0 <br />500 <br />106 <br />70-130 <br />Surrogate DrbromoJluoromethane <br />53 0 <br />500 <br />106 <br />50-150 <br />Surrogate 1 2-Dtchloroethane d4 <br />54 0 <br />500 <br />108 <br />50-150 <br />Surrogate Toluene -d8 <br />510 <br />Soo <br />102 <br />50-150 <br />Surrogate 4-Bromofluorobenzene <br />510 <br />500 <br />102 <br />50-150 <br />Matrix Spike (OD13012-MSI) <br />Source <br />W004227-01 <br />Prepared & Analyzed <br />12 -Apr -00 <br />1 1 Dichloroethene <br />408 <br />20 ug/1 <br />Soo <br />ND <br />81 6 <br />60 140 <br />rizerio <br />455 <br />t 0 <br />500 <br />ND <br />91 0 <br />60-140 <br />chloroethene <br />438 <br />20 <br />500 <br />ND <br />876 <br />60-140 <br />Toluene <br />43 3 <br />20 <br />500 <br />ND <br />866 <br />60-140 <br />Chlotobenzene <br />421 <br />2 0 <br />300 <br />ND <br />842 <br />60-140 <br />Surrogate Dibromofluoromethane <br />52 0 <br />Soo <br />104 <br />50-150 <br />Surrogate 12-Dichloroethane-d4 <br />540 <br />500 <br />108 <br />50-150 <br />Surrogate Toluene -d8 <br />510 <br />Soo <br />101 <br />54-150 <br />Surrogate 4-Bromofluorobenzene <br />Soo <br />500 <br />100 <br />50.150 <br />Matrix Spike Dup (OD13012-MSD1) <br />Source W004227-01 <br />Prepared & Analyzed 12 -Apr -00 <br />11-Drchloroelhene <br />474 <br />2 0 ug/l <br />500 <br />ND <br />948 <br />60-140 <br />150 25 <br />Benzene <br />517 <br />10 <br />500 <br />ND <br />103 <br />60-140 <br />128 25 <br />Tnchloroethene <br />508 <br />2 0 <br />500 <br />ND <br />102 <br />60-140 <br />148 25 <br />Toluene <br />49 8 <br />2 0 <br />500 <br />ND <br />996 <br />60.140 <br />140 25 <br />Chlorobenzene <br />50 0 <br />20 <br />500 <br />ND <br />100 <br />60 140 <br />172 25 <br />Surrogate Dibromofluoromethane <br />51 0 <br />500 <br />104 <br />50-150 <br />Surrogale 12-Dichloroetharre d4 <br />53 0 <br />500 <br />106 <br />50-150 <br />Surrogate Toluene -d8 <br />500 <br />500 <br />100 <br />50-150 <br />Surrogate 4-Bromofluoroberaene <br />510 <br />500 <br />101 <br />50450 <br />- 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 entirety <br />Page 18 of 22 <br />