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QSequoia <br />Analytical <br />Gettler Rvan Iris, - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron N 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 Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (9251988-9673 <br />www secluotalabs corn <br />Reported <br />18 -Apr -00 11 39 <br />Reporttng Spike Source %REC RPD <br />1nal-,te Result Limit Units Level Result %REC Limiter RPD Limit ;votes <br />Batch OD13012 - EPA 5030E [PIT] <br />LCS (OD 13012-BS2) <br />Prepared Analyzed 13 -Apr -00 <br />I 1 Duhloroethene <br />532 <br />20 ugt) <br />500 <br />106 <br />65-135 <br />Benzene <br />56 8 <br />1 0 <br />500 <br />114 <br />70 130 <br />Trichloroethene <br />560 <br />20 <br />500 <br />112 <br />70-130 <br />Toluene <br />545 <br />20 <br />500 <br />109 <br />70-130 <br />Chlorobenzene <br />53 0 <br />20 <br />500 <br />106 <br />70-130 <br />Surrogate Dibromofluoromethane <br />530 <br />500 <br />106 <br />50-150 <br />Surrogate 12 Dichloroethane d4 <br />540 <br />Soo <br />108 <br />50 150 <br />Surrogate Toluene -d8 <br />510 <br />500 <br />102 <br />50 150 <br />Surrogate 4-Bromofluorobercene <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 <br />-00 <br />l-Dichloroethene <br />408 <br />20 ug/l <br />500 <br />ND <br />816 <br />60-140 <br />45 5 <br />10 <br />500 <br />ND <br />91 0 <br />60-140 <br />T methene <br />43 8 <br />20 <br />500 <br />ND <br />876 <br />60-140 <br />Toluene <br />433 <br />20 <br />500 <br />ND <br />966 <br />60-140 <br />Chlorobenzme <br />421 <br />20 <br />500 <br />ND <br />842 <br />60-140 <br />Surrogate Dibromofluoromethane <br />520 <br />500 <br />104 <br />50-150 <br />Surrogate 1 1-Dwhloroethane-d4 <br />540 <br />Soo <br />108 <br />50-150 <br />Surrogate Toluene -d8 <br />510 <br />Soo <br />101 <br />50-150 <br />Surrogate 4-Bromo itorobemene <br />Soo <br />Soo <br />100 <br />50-150 <br />Matrix Spike Dup (OD 13012 -MSD 1) <br />Source W004227-01 <br />Prepared & Analyzed 12 -Apr -00 <br />1 I-Dichloroethene <br />474 <br />20 ugA <br />500 <br />ND <br />949 <br />60-140 <br />150 25 <br />Benzene <br />517 <br />10 <br />500 <br />ND <br />103 <br />60-140 <br />12.8 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 />Chlombenzene <br />500 <br />2 0 <br />500 <br />ND <br />100 <br />60-140 <br />172 25 <br />Surrogate Dibromofluoromethane <br />510 <br />500 <br />104 <br />50-150 <br />Surrogate 1 1-Dichloroeihane-d4 <br />530 <br />500 <br />106 <br />50-150 <br />Surrogate Toluene -d8 <br />500 <br />500 <br />100 <br />50-150 <br />Surrogate 4-Bromofluorobemene <br />510 <br />Soo <br />101 <br />50 150 <br />Sola Analytical - Walnut Creek The re+alts in this report apply to the sampler analviced nt accordance with the chain of <br />custodv document This analytical report must be reproduced to m entirety <br />Page 18 of 22 <br />