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+ 1551 [ndustnal Road <br /> Sequoia San Carlos, CA 94070-4111 <br /> (650) 232-9600 <br /> IWO Analytical FAX(650) 232-9612 <br /> Maine Tech Services Project Shell(]) Sampled 5/28199 <br /> 1680 Rogers Avenue Project Number Shell 7910 Lower Sacramento Rd,Stockton Received 611/99 <br /> San Jose,CA 95112 Project Manager Fran Thie Reported 6117/99 <br /> - MTBE by EPA Method 8260A/Quality Control -- <br /> Sequoia Analytical-'San Carlos _ <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9060091 Date Prepared 6115/99 Extraction Method RPA 5030E PIT <br /> Blank 9060091-BLK1 <br /> _Methyl tent-butyl ether 6115/99 ND ug/l 100 <br /> Surrogate 1,2-Dichloroethane-d4 50 0 510 if760-114 102 <br /> Blank 9060091-BLK2 <br /> Methyl tert-butyl ether 6116/99 ND ug/l 200 <br /> Surrogate 1,2-Dichloroethane-d4 500 541 760-114 108 <br /> LCS 9060091-BSI <br /> Methyl tert-butyl ether _ 6/15199 Soo 569 ug/l 700-130 114 <br /> Surrogate 1,2-Dichloroethane-d4 500 513 760-114 103 <br /> LCs 9060091-BS2 <br /> Methyl tert-butyl ether 6116199 500 644 ug/l 700-130 129 <br /> 0rogate 1,2-Dichloroethane-d4 0500 564 it760-114 113 <br /> Matrix Spike 9060091-MSI L906203-03 <br /> _Methyl tert-butyl ether 6/16/99 500 ND 526 ug/l 600-140 105 <br /> Surrogate 1,2-Dichloroethane-d4 500 500 if760-114 100 <br /> Matrix Sake Dug) 9060091-MSDI L906203-03 <br /> Methyl tert-butyl ether 6/16/99 500 ND 626 ug/l 600-140 125 250 17 4 <br /> Surrogate 12-Dichloroethane-d4 500 52 7 760-114 105 <br /> Aft <br /> Woia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> r <br /> Page 6 of 7 <br />