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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical www <br /> (925)alabs 73 <br /> sequolalabs corn <br /> SEF—or- Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#595,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 29-Aug-01 11 26 <br />' Volatile Organic Compounds by EPA Method 8260B _ Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Repotting Spike Source %REC RPD <br /> nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G27018- EPA 5030B(MeOH) <br /> ICS(1G27018-BSI) _ Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> ethyl Cert butyl ether(MTBE) -2 47 0 20 mg/kg 250 98 8 70-130 <br /> Surrogate Dibromofluoromethane 257 - 250 103 50-154 <br /> Logale 1 2-Dechloroethane-d4 246 250 984 50-150 <br /> (IG27018-BS2) Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl tert-butyl ether(MTBE) _ --- -- - - --2 13 ------020 mg/kg 250 852 70-130 - -- -� <br /> 1rwe Dibromofluoromethane 239 250 956 50-150 <br /> ""I-li.g-le 1 2-Dichlorcethane-d4 246 250 984 50-150 <br /> S(1G27018-BS3) Prepared 31-Jul-01 Analyzed 01-Aug-01 <br /> ethyl tert-butyl ether(MTBE) 289 020 mg/kg 250 116 70-130 --- - <br /> Surrogate Dibromofluoromethane 240 250 960 50-150 <br /> turr ale 1 2-Dichloroethane-d4 239 250 956 50-150 <br /> Spike(1G27018-MSI) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl tort-butyl ether(MTBE) 198 020 mg/kg 250 ND 792 60-I40 <br /> te Dibromofluoromethane 121 250 884 50-150 <br /> lu'r-r-019ga-te 12-Drchloroethane-d4 224 250 896 50450 <br /> Matrix Spike(1G27018-MS2) Source W107334-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Fethyl tent-buty)ether(MTBE) 231 020 mg/kg 250 ND 924 60-140 <br /> urrogare Dibromofluoromethane 246 250 984 50-150 <br /> Surrogate 1 2-Dechloroethane-d4 240 250 960 50-150 <br /> atrix Spike Dup(1G27018-MSD1) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> ethyl tert-butyl ether(MTBE) 262 020 mg/kg 250 ND 105 60-140 278 25 ZQ-07 <br /> Surrogate Dibromofluoromethane _ 256 250 102 50-150 <br />[rrogale 1 2-Dtchloroethane-d4 252 250 101 50-150 <br /> equola 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 entirety <br /> Page II of 13 <br />