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404 N Wiget Lane <br /> Sequoia Walnut Geek CA 94598 <br /> (925)988 9600 <br /> FAX(925)988%73 <br /> Analytical WWW sequoialabs corn <br /> Sec -Rancho Cordova Project Arco <br /> 1017 Kilgore Rd, Ste 4100 Project Number Arco 4 595,Stockton Reported <br /> ancho Cordova CA, 95670 Project Manager Rusty Benkosky 29-Aug-01 I 1 3 l <br /> ' Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> alyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> atch 1627018- EPA 5030B (MeOH) <br /> IS(1G27018-BSI) Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> thyl tert but)I ether(M 1 BL) 247 020 mg/kg 250 988 70-130 <br /> 4urrogale Dibrontofluoromethane 257 250 103 50-150 <br /> tS09(aG27018-BS2) <br /> le 12 Drchloroetharre-d4 246 250 984 50 150 <br /> Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> viethyl tert-butyl ether(MTBE) i13 020 mg/kg 250 85 2 70 130 <br /> IlerogaDibromofluoromelhone 239 250 956 50 150 <br /> rogafe 1 1-Dichloroethane-d4 246 250 984 50 150 <br /> LCS(IG27018-1353) Prepared 31-Jul-01 Analyzed 01-Aug-01 <br /> Ithyl ten-butyl ether(MTBE) 289 020 mglkg 250 1l6 70 130 <br /> ogale Dibromofluoromelhane 2 i0 250 960 50 150 <br /> ith <br /> re 12-Dichloroethane-d4 239 250 956 50-150 <br /> ike(IG27018-MSI) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> yl tort-butyl ether(MTBE) 1 98 0 20 mg/kg 2 50 ND —7-9j 60-140 <br /> fl-0199:fe <br /> te Dibromofluoromelhane 221 250 884 50-150 <br /> 12-Dichloroethane-d4 224 250 896 50-150 <br /> Matrix Spike(1G27018-MS2) Source W107334-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> thy'tort-butyl ether(MTBE) 2 3 <br /> _ 1 0 20 mg/kg 2 50 ND 924 60-140 <br /> mm <br /> f.rorogwe Dibromofluoromelhane 146 250 984 50-150rogafe 11-Dichloroelhane-d4 240 250 960 50-150 <br /> Itrix Spike Dup(IG27018-MSD1) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> thyl tert-butyl ether(MTBE) 262 020 mg/kg 2 50 ND 105 60-140 27 8 25 zQ-07 <br /> Surrogate Dibromofluoromelhane 256 250 102 50-150 <br /> rogate 1 1-Dichloroelhane-d4 252 250 101 50-150 <br /> quoia Analytical- Walnut Creek The results to this report apply 10 the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> I <br /> Page 14 of 16 <br /> `�yc <br />