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Sequoia 1551 lndustnal Road <br /> San Carlos CA 94070-4111 <br /> Analytical (650)232-9600 <br /> FAX(650)232-9612 <br /> Environmental Resolutions Project. Tosco(1) Sampled 5110199 to 5/11/99 <br /> 74 Digital Drive,Suite 6 Project Number Tosco 76#5886/ERI jOB#20550477 Received 5/11/99 <br /> Novato,CA 94949 Project MnScr Keith Romstad Reported 5125199 <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Anal Analyzed Level Result Result Units Recov Lnruts % Limit % Notes* <br /> Batch: 9050056 Date Prepared-_5113199 Extraction Method- EPA 5030E JPrI'1 <br /> Blank 9050056-BLKI <br /> Methyl tett-butyl ether 5/13199 ND 119/1 200 <br /> Surrogate 1,2-Drchloroeihane-d4 ff500 488 760-114 976 <br /> Blank 9050056-BLK2 <br /> Methyl tart-butyl ether 5/17199 ND ugA 2.00 <br /> Surrogate 1,2 D1Chloroethaned4 " 500 477 " 760-114 954 <br /> LCS 9050056-BSI <br /> Methyl tart-butyl ether 5/13/99 500 468 ug/1 700-130 93 6 <br /> Surrogate 1,2-Drchloroethaned4 x500 50 4 760-114 101 <br /> ICS 9050056-BS2 <br /> teat butyl ether 5/17/99 500 429 119/1 700-130 85 8 <br /> gate 42-D:chloroethane-d4 500 469 " 760-114 938 <br /> Mat z Spike 9050056-MSI L905034-01 <br /> Methyl tent-butyl ether 5/13/99 Soo ND 476 ug/l 600-140 95.2 <br /> Surrogate 1,2 Drchloroethane-d4 " 500 508 ff 760-114 102 <br /> Matnx Snike Dun 9050056-MSD1 L905034-01 <br /> Methyl tert-butyl ether 5113199 500 ND 478 ug/1 600-140 95.6 250 0 419 <br /> Surrogate 1,2 Duhloroethane-& Soo 508 760-114 102 <br /> sequoia Analytical-San Carlos *Refer to end of reportfor tent of now and nitrons <br /> de� <br /> Page 5 of 6 <br />