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404 N Wlget Lane <br />Sequoia Walnut Creek c 94598 <br />4 (925) 9$8 &-9600 <br />FAX (925) 988-9673 <br />Analytical www secluolalabs corn <br />'*G;Ttle, Ryan Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Poiston 19 -Apr -00 11 41 <br />Volatile Organic Compounds by EPA Method 8260A - 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 OD14016 - EPA 5030E [PIT) <br />LCS (OD 14016 -BSI) Prepared & Analyzed 14 -Apr -00 <br />%lethyl tert-butyl ether 564 0 50 mg/m3 Air 500 113 70 130 <br />Surrogate Dibromofluoromethane 530 500 106 50-150 <br />Surrogate 1 2-Dichloroethane d4 470 500 940 50-150 <br />LCS Dup (OD14016-ESDI) Prepared & Analyzed 14 -Apr -00 <br />Methyl tert-butyl ether 444 0 50 mglm' Air Soo 888 70.130 238 25 <br />Surrogate Dibromofluoromethane <br />Surrogate I2-Dtchloroethane-d4 <br />PJ <br />Sequoia Analytical - Walnut Creek <br />0 <br />500 500 <br />460 500 <br />100 50 150 <br />920 50-150 <br />The results in this report apply to the samples analysed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />Page 6 of 7 <br />