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•1 ( I <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-%00 <br /> Analytical FAX(916)921-0100 <br /> www u quotalabs cam <br /> . SECOR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,State 100 Project Number- 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project 1v-m- Rusty Benkosky 04/10/02 16 29 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Azialyle Result Limit Units Level Result %REC Limtts RPD Limit Notes <br /> Batch 2030283-EPA 5030B(P/Tj <br /> LCS 2030283-BS1 Prepared 03/22/02 Analyzed 03/23/02 <br /> Benzene 23 1 050 ug/l 25 0 92 4 70-130 <br /> Methyl tert-butyl ether 21 2 050 25 0 848 60-140 <br /> Chlorobenzene 246 050 25 0 984 70-130 <br /> 1,1-Dtchloroethene 22 5 0 50 25 0 900 70-130 <br /> Toluene 244 050 25 0 976 70-130 <br /> Trichloroethene 229 050 25 0 91 6 70-130 <br /> Surrogate 12-DCA-d4 197 25 0 78 8 60-140 <br /> Surrogate Dibrom ofluorom ethane 20 7 25 0 82 8 70-130 <br /> Surrogate 1 2-DCA-d4 19 7 250 78 8 70-130 <br /> Surrogate Toluene-d8 210 25 0 84 0 70-130 <br /> Surrogate 4-BFB 225 250 90 0 70-130 <br /> Matrix Spike(2030283-MSI) Source 5203281-09Prepared 03/22/02 Analyzed 03/23/02 <br /> Onzene <br /> 23 1 0 50 ug/l 25 0 ND 920 60-140 <br /> ethyl Cert-butyl ether 21 3 0 50 " 25 0 ND 847 60-I40 <br /> Chlorobenzene 23 8 0 50 25 0 ND 94 7 60-140 <br /> 1,1-Dtchloroethene 22 6 0 50 25 0 ND 902 60440 <br /> Toluene 241 0 50 25 0 ND 959 60-140 <br /> Trichloroethene 226 0 50 " 25 0 ND 89 2 60-140 <br /> Surrogate 12-DCA d4 196 25 0 78 4 60-140 <br /> Surrogate Dzbromofluorom ethane 208 25 0 832 70-130 <br /> Surrogate 1 2-DCA-d4 196 25 0 78 4 70-130 <br /> Surrogate Toluene-d8 206 250 82 4 70-130 <br /> Surrogate 4-BFB 21 7 25 0 868 70-130 <br /> Matrix Spike D_up(2030283-MSD1) Source 5203281-09 Prepared 03/22/02 Analyzed 03/23/02_ <br /> Benzene 225 0 50 Ito 25 0 ND 896 60-140 263 25 <br /> Methyl tert-butyl ether 209 0 50 25 0 ND 83 1 60-140 I 90 25 <br /> Chlorobenzene 23 7 0 50 25 0 ND 943 60-140 0 421 25 <br /> i,l-Dtchloroethene 22 1 0 50 25 0 ND 88 2 60-140 224 25 <br /> Toluene 23 7 0 50 25 0 ND 943 60-140 1 67 25 <br /> Trichloroethene 223 0 50 25 0 ND 88 0 60-140 1 34 25 <br /> Surrogate 1,2-DCA-d4 195 25 0 78 0 60-140 <br /> Surrogate Dibromofluoromethane 21 2 25 0 848 70-130 <br /> Surrogate 1 2-DCA-d4 195 " 25 0 78 0 70-130 <br /> Surrogate Toluene-d8 21 2 15 0 84 8 70-130 <br /> Surrogate 4-BFB 223 25 0 892 70-130 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 26 of 27 <br />