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Gettler-Ryan/Geostrategtcs(1) Project. Tosco(1) 6747 Sierra Court,Suite d Project Number Unocal SS#08671 Reported Dublin CA,94568 Project Imager Deanna Harding 02/15/01 13 12 Volatile Organic 8 Ozyganated Compounds by EPA Method 8260B - Quality Control Sequoia Analytical- San Carlos Rq-rttng Spae sotiuee %REC RPD IArWyW Result limit Units Level - Result %REC limits RPD limit Notes ' Batch 1020009-EPA 5030B [P/TJ----- ---- - - - ---- - ---�-- -- - LCS(1020009-BS2) Prepared&Analyzed 02/06/01 Methyl tert-butyl ether 544 200 ug/l Soo 109 70-130 Surrogate 1,2 Dichloroethane-d4 561 Soo 112 76-114 Surrogate Toluene-d8 Sol Soo 100 88-110 Matrix Spike(1020009-MS1) Source-L102005-01 Prepared&Analyzed 02/02/01 Methyl Cert-butyl ether 548 200 ug/1 Soo ND 110 60-140 Surrogate 1,2 Dichloroethane-d4 526 " Soo 105 76-114 Surrogate Toluene-d8 500 500- 100 88-110 Matrix Spike Du (1020009-MSDI) Source.L102005-01 Prepared&Analyzed 02/02/01 Methyl cert-butyl ether 538 200 ug/1 Soo ND 108 60-140 184 25 Surrogate 1,2-Drchloroethane-d4 551 500 110 76-114 Surrogate Toluene-d8 491 " 500 982 88-110 Batch 1020022-EPA 5030B /T Blank(1020022-BLKI)--- Prepared&Analyzed 02/06/01----.�-, — Ethanol ND 1000 ug/1 1,2-ihbr omeiethar►o-- --- -— -_-- —ND---—200----"--- -- - --_- -- - ------- ---- - -- — 1,2-Dichlorocthano ND 200 " Dr-isopropyl ether--------------_.-_-- ND_� 200T- -- Ethyl teat-butyl ether ND 200 " Methyl ttxt4mtyl ether ND 200 " Teat-amyl methyl ether ND 200 " _ Teat-butyl alcohol ND 100 " Surrogate 1,2-Dichloroethaned4 516 500 103 76-114 Surrogate Toluene-l8 - 500 " Soo 100 88-110 Sequom Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the e:irar custody document Thu analytical report must be reproduced in its entirety Page 10 of 13