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4 1551 Industrial Road <br /> Sequoia Sari Cad��650'2-9 M <br /> FAX(650)232-%12 <br /> ,!D <br /> Analytical www sequotalats com <br /> Gelder-Ryan/Geost W,Ves(l) Project. Tosco(5) Sampled. 7/5100 <br /> 6747 Sierra Court,Suite J Project Number Unocal Circle K SS#12O5 Received 715/00 <br /> Dublin,CA 94568 Project Manager Deanna Hardin R 7/18/00 <br /> TR <br /> n aui�?t�r:genB =ompounl�sd =01 <br /> Z <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Anal Analyzed Level Result Result Umts Recov Lmnts % Lmut % Notes' <br /> Batch: 0070038 Date Prepared: 7/1O/0O Extraction Method:_EPA 5O30B WM <br /> Blank 0070038-BLKI <br /> Ethanol 7110/00 ND U911 1000 <br /> Tent butyl alcohol " ND 100 <br /> Methyl tat-butyl ether ND 0.500 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl teat-butyl ether ND 2.00 <br /> Tert-amyl methyl ether ND " 2.00 <br /> Surrogate 1,1-D:chloroethane-d4 " 500 501 760-114 100 <br /> Blank 0070038-BLK2 <br /> Ethanol 7112100 ND ug/I 1000 <br /> Tert-butyl alcohol ND 100 <br /> Methyl tart-butyl ether ND a2.00 <br /> M-isopropyl ether " ND " 2.00 <br /> 1 tat-butyl ether ND 2.00 <br /> -amyl methyl ether " ND " 2.00 <br /> Surrogate. 1,1-Drchloroethane-d4 500 487 " 760-114 974 <br /> L CS 0070038-BSI <br /> Methyl tent-butyl ether 7/10/00 500 441 u9/1 700-130 882 <br /> Surrogate 1,2 Dwhloroethane-d4 ffSoo Soo " 760-114 100 <br /> LCS 0070038-BS2 <br /> Methyl tert butyl ether 7/12/00 Soo 438 ug/l 700-130 876 <br /> Surrogate 1,1-Dtchloroethane-d4 to 500 458 760-114 916 <br /> Matrix Spike 0070038-MS1 LO0705801 <br /> Methyl tat-butyl ether 7110/00 500 ND 461 ug/l 600-140 92.2 <br /> Surrogate 42 Dlchloroethane-d4 it 500 510 " 760-114 104 <br /> Matrix Solke Dui 0070O3&MSD1 LO07058-01 <br /> Methyl tat-butyl ether 7110100 500 ND 472 ug/l 600-140 94.4 250 236 <br /> Surrogate 1,1 Du hloroethane-d4 500 512 " 76 0414 101 <br /> is Analytical-San Carlos *Refer to end of reportfor test of notes and definitions <br /> Page 9 of 10 <br />