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Sequoia <br />Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs com <br />Gettler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA, 94568 Project Manager Deanna L Harding 29 -Jul -0017 31 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />4nalvte Result Luna Units Level Result %REC Limits RPD Limit Notes <br />Batch OG26017 - EPA 5030B [PIT] <br />LCS (OG26017-BS2) <br />Prepared & Analyzed 27 -Jul -00 <br />Methyl tent -butyl ether <br />539 20 ugn <br />500 108 70-I30 <br />Surrogate Dibromofluoromethane <br />530 <br />500 106 50-150 <br />Surrogate 1,2 Dichloroethane-d4 <br />520 <br />Soo 104 50-150 <br />Matrix Spite (OG26017-MS1) <br />Source W007484-02 <br />Prepared & Analyzed 25 -Jul -00 <br />Methyl tert-butyl ether <br />521 20 ug/l <br />500 ND 104 60-150 <br />Surrogate Dibromofluoromethame <br />500 <br />Soo 100 50150 <br />Surrogate 1, 2 Dtchloroethane-d4 <br />500 <br />Soo 100 50-150 <br />Matrix Spike Dup (OG26017-MSD1) <br />Source W007484-02 <br />Prepared & Analyzed 25 -Jul -00 <br />Methyl tett-butyl ether <br />544 20 ug/i <br />500 ND 109 60-150 432 25 <br />Surrogate DibromoJluoromethane <br />500 " <br />500 100 So -150 <br />Sine 1,2-Dtchloroethane-d4 510 S00 102 50150 <br />S ia Analytical- Walnut Creek The results in flus report apply to the samples analyzed in accordance with the chain of <br />custody document. 77us analytical report must be reproduced in its entrrety <br />Page 24 of 26 <br />