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Sequoia 819 Striker Avenue,Suit,8 <br /> Sacramento.(916)92 95834 <br /> Analytical FAX (916)921-9600 <br /> (916)921-0100 <br /> www.sequofalabs.mm <br /> F3330 <br /> ta Environmental Consultants Project: Arco 5559 Stockton,CA <br /> Cameron Park Dr. Sampled: 7/31/00 <br /> eron Park,CA 95682 Project Number: N/A <br /> Pro'ect Mana er: Jay Johnson Received: 8/1/00 <br /> Re orted: 8/3,7/00 <br /> Volatile Organic Compounds by EPA Method 82608/Quality Control <br /> Sequoia Analytical-Walnut Creek <br /> Analyte Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyzed Level Result Result <br /> Units Recov.Limits % Limit % Notes* <br /> Batch: OH02010 Date Prepared: 8/2/00 <br /> Extraction Method- EPA 5030B 1MeOH1 <br /> Blank OH02010-BLKI <br /> tert-Butyl alcohol 8/2/00 <br /> Methyl tert-butyl ether o ND mg/kg 5.0 D <br /> Di-isopropyl ether .. ND 0.10 D <br /> Ethyl tert-butyl ether ND 0,10 D <br /> tert-Amyl methyl ether ND 0.10 D <br /> Surrogate. D�bromoJluoromethane — ND - 0.10 D <br /> 2.50 1.35 50-15094.0 --- D <br /> Surrogate: 1,2-Dichloroethane-d4 2.50 2.35 " <br /> 50-150 94.0 D <br /> LC OH02010-BSI <br /> Methyl Cert-butyl ether 8/2/00 2.50 <br /> Surrogate. Drbromo�luaramethane �---- — ---.-3A3 mg/kg 70-130 121 D <br /> 2.50 2.50 50-/50 100 D- <br /> Surrogate: /,2-Dichloroethane-d4 2.50 2,55 " <br /> 50-/50 /02 p <br /> Matrix Spike OH02010-MSI 5008002-01 <br /> Methyl tert-butyl eller 8/2/00 2.50 <br /> Surrogate: DibromoJluaromethane .. ND 3.05 mg/kg 60-140 8.0 D <br /> 1.50 1.45 50-150 98.0 D <br /> Surrogate: 1,2-Dichloroethane-d4 2.50 2.50 50-150 100 <br /> D <br /> Matrix Spike Dun OH02010-MSDI 5008002-01 <br /> Methyl tert-butyl ether _ 8/2/00 2.50 ND <br /> Surrogate. DibromoJluoromethane -- ---- _--._3.33 mg/kg 60-140 133 25 8.78 _ D <br /> D <br /> 250 2.60 <br /> Surrogate: 50-150 /04 1,2-Dichloroethane-d4 1.50 1.55 50-150 101 <br /> D <br /> Sequoia Analytical-Sacramento *Refer fo end of reportjor text of nates and definitions. <br /> Page 13 of 14 <br />