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Sequoia <br />ID 4W <br />Analytical <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 9W9600 <br />FAX (925) 9$&9673 <br />www sequofalabs corn <br />Gettler Rvan Inc -Dublin Pro)ei.t Chevron <br />6747 Sierra Court Suite ! Project Number Chevron #9-5775 Reported <br />Dublin CA 94568 Proles t Manager Stott Polston 15 -Aug -00 08 02 <br />Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knalvte Result Limit [hits Level Result %REC Limits RPD Limit Notes <br />Batch OH144110 - EPA 5030B [PIT] <br />Blank (OH14010-BLK1) <br />Prepared & Analyzed <br />14 -Aug -00 <br />tert-Butyl alcohol <br />ND <br />100 <br />Upi <br />\Iethvl tent butvl ether <br />ND <br />20 <br />Dr-tsopropvt ether <br />ND <br />20 <br />Ethvl ten hutvl ether <br />ND <br />20 <br />tert-Arms methvl ether <br />ND <br />20 <br />Surrogate Dibromofluoromeihane <br />530 <br />500 <br />106 SO -150 <br />Surrogate 1 2-Dtchlorvethanw-d4 <br />500 <br />500 <br />100 50.150 <br />LCS (OH14010-BSI) <br />Prepared & Analyzed <br />14 -Aug -00 <br />WA tort -butyl ether <br />512 <br />20 <br />ug/I 500 <br />102 70-130 <br />gale Dibromofluoromethane <br />Surrogate 1 2-Drchloroethane-d4 <br />530 500 loss )o-u.�u <br />490 500 98.0 50-150 <br />Matrix Spike (OH14010-MSI) Source W008305-01 Prepared & Analyzed 14 -Aug -00 <br />Methyl tert-butvl ether 449 20 ug/1 500 ND 898 60.150 <br />Surrogate Dtbromtrfluoromethmre 500 Soo 100 50 -ISO <br />Surrogate 1 2-Dtchloroethane-d4 510 500 102 50.150 <br />Matrix Spike Dup (OH14010-MSDi) Source W008305-01 Prepared & Analvzed 14 -Aug -00 <br />Methyl tert-butyl ether 511 20 ug/l 500 ND 102 60.150 129 25 <br />Surrogate Dibromofluoromethane 510 Soo 101 50-150 <br />Suri,ogau 1 2-Dtchloroethane-d4 530 Soo 106 50-150 <br />Sequoia Analytical - Walnut <br />The results to tins report apply to the samples analyzed to accordance will, the cram 01 <br />custody document Thus analytical report must be reproduced in its entirety <br />Page 6of7 <br />