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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988 9600 <br /> --- <br /> FAX(9251 73 <br /> www sequoiabs Analytical - - - -- - - - - alabs c com <br /> t <br /> cor-Rancho Cordova Project Arco <br /> 17 Kilgore Rd Ste #100 Project Number Arco#4932, Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 3 I-1u1-01 10 56 <br /> ' Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> alyli. Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> 3atch 1G27018 - EPA 5030B(MeOH) <br /> Ittrix Spike(IG27018-MSI) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> hyl tort-butyl ether 1 98 020 mg/kg 2 50 ND 792 60-140 <br /> t"0199: <br /> te Dibromofluoromelhane 221 250 884 50-150 <br /> te 1 1-Dichloroethane-d4 214 250 896 50-150 <br /> Matrix Spike(IG27018-MS2) Source W107334-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> �thyl tert-butyl ether 231 - - 020- mg/kg 2 50 ND 924--60-140 -- —---- - ---- <br /> rogale Dibromofluoromethane 246 250 984 50-150 <br /> wurrogate 12-Dichloroelhane-d4 240 250 960 50 150 <br /> Ittnx Spike Dup(1G27018-MSDI) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> hyl tert-butyl ether 262 T 020 mg/kg 250 ND 105 60-140 278 25 Q-07 <br /> iurrogale Dibromofluoromethane 256 2 50 102 50-150 <br /> 1101 2-Dichloroethane-d4 252 250 101 50-150 <br /> spike Dup(1G27018-MSD2) Source W107334-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl cert-butyl ether 245 020 mg/kg 250 ND 980 60-140 5 88 25 <br /> Irogate Dibromofluoromethane 216 II 2.50 864 50-150 <br /> rogate 1 2-Dichloroethane-d4 132 150 928 50-150 <br /> 1 <br /> a Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document 7his analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />