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Sequoia CA 404 N Lane <br /> Walnut Creek CA 94598 <br /> 4 (925)968-9600 <br /> FAX(925)988%73 <br /> Analytical www sequoialabs com <br /> Sec -Rancho Cordova Project Arco <br /> t017 Kilgore Rd Ste #100 Project Number Arco#4932,Stockton Reported <br /> ancho Cordova CA,95670 Project Manager Rusty Benkosky 27-Jul-01 14 25 <br /> ' Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G25009- EPA 5030B(MeOH) <br /> S(IG25009-BS2) Prepared 05-Jul-01 Analyzed 26-Jul-01 <br /> thyl tert-butyl ether 291 _ 020 mgfkg 250 116 70-130 <br /> Surrogate Dibromofluoromethane 265 250 106 50-150 <br /> gte 1 2-Dichloroethane-d4 244 250 976 50-1SO <br /> 1'r,0,,"l <br /> Spike(IG25009-MSI) Source W107244-02 Prepared 25-Jul-01 Analyzed 26-Jul-01 <br /> Methyl tert-butyl ether 268 _ 020 mg/kg 250 ND 107 60-140 <br /> 1rogate Dibromofluoromelhane _ 275 230 110 50-150 <br /> rogate 12-Dichloroethane-d4 155 250 101 50-150 <br /> Matrix Spike Dup(1G25009-MSD1) Source W107244-02 Prepared 25-Jul-01 Analyzed 26-Jul-01 <br /> Ithyl tert-butyl ether 329 020 mg/kg 250 ND 132 60-140 204 25 <br /> rogale Dibromofluoromelhane 1&0 150 112 50-150 <br /> Sure 1 1-Dichloroelhane-d4 150 250 100 50-150 <br /> I <br /> i <br /> I <br /> I <br /> I <br /> quota Analytical -Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its ennrety <br /> ' Page 14 of 15 <br />