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404 N Wiget Lane , <br /> 1 Sequoia Walnut Creek CA 94598 <br /> (9Z5)988 9600 <br /> FAX (925)988 9673Analyt , <br /> • 1 www sequoialabs com <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd Ste #100 Project Number Arco 0 4932 Stockton Reported , <br /> Rancho Cordova CA 95670 Project Manager Rusty Benkosky 27-Jul-01 14 25:1 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek ' <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G20011 - EPA 5030E(P/T) ' <br /> Matrix Spike(IG20011-MSI) Source W107223-04 Prepared&Analyzed 24-Jul-01 <br /> Methyl tent-butyl ether 479 20 Ug/1 500 ND 95 8 60-150 <br /> Surrogate Drbromofluoromethane 490 - 500 _ 980 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 470 500 940 50-150 <br /> Matrix Spike Dup(1G20011-MSD1) Source W107223-04 Prepared 24-Jul-01 Analyzed 25-Jul-Oi <br /> Methyl tent-butyl ether _ 586 20 ug/l 500 ND 117 60-150 201 25 <br /> Surrogate Drbromofluoromethane 540 — 500 - 108 50 150 T <br /> Surrogare 1 2-Dichloroethane-d4 520 500 104 50-150 ' <br /> Batch IG25009- EPA 5030B(MeOH) <br /> Blank(IG25009-BLKI) Prepared&Analyzed 25-Jul-01 ' <br /> Ethanol ND 25 mglkg <br /> cert-Butyl alcohol ND 25 " <br /> Methyl tert-butyl ether ND 020 <br /> Di-isopropvl ether ND 010 " <br /> Ethyl tent-butyl ether ND 010 " <br /> tent-Amyl methyl ether ND 010 <br /> 1,2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogale Drbromofluoromethane 281 250 112 50-150 , <br /> Surrogate 1 2-Drchlaroethane-d4 261 250 104 50-150 <br /> LCS(IG25009-BSI) Prepared 25-Jul-01 Analyzed 26-Jul-01 <br /> Methyl tett-butyl ether 269 <br /> 0 24 mg/kg 2 50 !08 70 130 <br /> Surrogare Drbromofluoromethane 2 79 — 250 112 50-150 <br /> Surrogate 12-Drchloroethane-d4 251 250 100 50-150 <br /> 1 <br /> Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyzed:n accordance with the chain of ' <br /> custody document Vrrs analytical report must be reproduced in its entirety <br /> 0 <br /> Page 13 of 15 ' <br />