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a 1 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 7 Sequoia 404 N Wlget Fane Walnut Creek.CA 94598 (9Z5)9a8-9600 FAX(925)988-9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> mine Tech Services Project Shell(2) Sampled 3/2/99 <br /> 1680 Rogers Avenue Project Number Shell 341 Cast Main St,990302-C2 Received 3/4/99 <br /> San Jose,CA 95112 Project Manager Fran Thie R orted 3/25/99 <br /> MTBE Confiniation by EPA Method 826OA/Quahty Control <br /> Sequoia Analytical-San Carlos <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limas % Limit % Notes* <br /> Batch 9030069 Date Prepared _3/18/99 Extraction Method EPA 5030B 1P/T1 <br /> Blank 9030069-BLK1 <br /> Methyl tert-butyl ether 3/18/99 ND ug/l 2 00 <br /> Surrogate 1,2-Dichloroethane-0 500 535 or 76 0-114 107 <br /> I <br /> Blank 9030069-BLK2 <br /> Methyl tent-butyl ether 3/22/99 ND ug/1 200 <br /> Surrogate 12-Dichloroethane-d4 " 500 511 It <br /> 760-114 102 <br /> Blank 9030069-BLK3 <br /> Methyl tert-butyl ether 3/23/99 ND ug/1 2 00 <br /> Surrogate 12-Dichloroethane-d4 " 500 502 760-114 100 <br /> LCS 9030069-BSI <br /> Methyl tent-butyl ether 3/19/99 Soo 58 0 ug/1 700-130 116 <br /> ogate 1 1-Dichloroethane-d4 500 SO 0 760-114 100 <br /> Z'CS 9030069-BS2 <br /> Methyl tert-butyl ether 3/22/99 50 0 506 ug/l 700-130 101 <br /> Surrogate 1,2-Dichloroethane-d4 11 50 0 49 6 760-114 992 <br /> LCS 9030069-BS3 <br /> Methyl tert-butyl ether 3/23/99 500 521 ug/1 700-130 104 <br /> Surrogate 1,2-Dichloroethane-d4 " 500 510 760-114 102 <br /> Matnx Spike 9030069-MSI L903125-04 <br /> Methyl tert-butyl ether 3/18/99 500 ND 557 ug/l 600-140 111 <br /> Surrogate 12-Dichloroethane-d4 500 505 ef 760-114 101 <br /> Matrix Spike Dup 9030069-MSDI L903125-04 <br /> Methyl tert-butyl ether 3/18/99 Soo ND 516 ug/1 600-140 103 250 748 <br /> Surrogate 1,2-Dichloroethane-d4 or 500 512 760-114 102 <br /> oia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> Page 4 of 5 <br />