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1551 industrial Road <br /> 4 Sequoia San Carlos CA 94070-4111 <br /> (650) 232-9600 <br /> 4D Analytical FAX(650) 232-9612 <br /> Blame Tech Sernces Protect Shell(2) Sampled 4/8/99 <br /> 1680 Rogers Avenue Project Number Shell 341 East Main St,Ripon Received 4/9199 <br /> San Jose,CA 95112 Project Manager Fran Thie Reported 5/12/99 <br /> � ",MTBlE Conrirmati4i by EPA Method$260AfQuahiy Control <br /> Sequaia Anaiyhcal=San Carlos <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9050027 Date Prepared517199 Extraction Method EPA 5030B [P/TI <br /> Blank 9050027-BLK1 <br /> Methyl tert-butyl ether 5/7/99 ND ug/l 200 <br /> Surrogate 12-Dichloroethane-d4 500 520 760-114 104 <br /> LCS 9050027-BS1 <br /> Methyl tent-butyl ether 5/7/99 500 497 ug/l 700-130 994 <br /> Surrogate 12-Dichloroethane-d4 H500 553 760-114 111 <br /> Matrix Spike 9050027-MSI L905036-07 <br /> Methyl tent-butyl ether 517199 Soo 38 0 91 4 ug/1 60 0-140 107 <br /> Surrogate 12-Dichloroethane-d4 500 538 fe760-114 108 <br /> Matrix Spike Dup 9050027-MSD1 L905036-07 <br /> Methyl tert-butyl ether 5/7/99 Soo 380 960 ug/l 600-140 <br /> 116 25 0 8 07 <br /> Surrogate 12-Dichloroethane-d4 500 53 9 760-114 108 <br /> Sequoia Analytical-San Carlos *Refer to end of report for test of notes and definitio <br /> �* <br /> Page 5 of 6 <br />