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819 Sutker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> 11� Sequoia (916)921-%00 <br /> FAX(916)921-0100 <br /> Analytical tyty,,sNuoialabs com <br /> SkE7CORnternational-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/16/02 13 32 <br /> Volatile Orgame Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result [.emit Units Level Result %REC Limits RPD limit Notes <br /> Batch 2010131-EPA 5030B [PIT] <br /> LCS 2010131-BS1 Prepared&Analyzed 01/11/02 <br /> Benzene 274 1 0 ug/I 25 0 110 70-130 <br /> Methyl tert-butyl ether 23 5 0 50 250 940 60440 <br /> Chlorobenzene 266 1 0 250 106 70-130 <br /> 1,1-Dtchloroethene 260 10 " 250 104 70-130 <br /> Toluene 284 1 0 25 0 114 70-130 <br /> Trichloroethene 240 10 25 0 960 70-130 <br /> Surrogate 12-DCA-d4 25 7 " 25 0 103 60-140 <br /> Surrogate Dibromofluoromethane 23 7 25 0 948 70-130 <br /> Surrogate 1 2-DCA-d4 257 250 103 70-130 <br /> Surrogate Toluene-d8 254 250 102 70-130 <br /> Surrogate 4-BFB 226 25 0 904 70-130 <br /> Matrix Spike 2010131-MSI Source S201093-01 Preeared&Analyzed 01/11/02 <br /> Wn <br /> zene 269 1 0 U91 25 D ND 108 60-144 <br /> ethyl tert-butyl ether 196 0 50 n 25 0 ND 784 60-140 <br /> Chlorobenzene 267 10 250 ND 107 60-140 <br /> I,1-Dtchloroethene 237 10 25 0 ND 948 60-140 <br /> Toluene 28 3 1 0 25 0 ND 113 60-140 <br /> Trichloroethene 23 1 1 0 250 ND 894 60-140 <br /> Surrogate 12-DCA-d4 228 25 0 912 60-140 <br /> Surrogate Dibromofluoromethane 214 250 856 70-130 <br /> Surrogate 1 2-DCA-d4 228 250 91 2 70-130 <br /> Surrogate Toluene-d8 252 250 101 70-130 <br /> Surrogate 4-BFB 223 250 892 70-130 <br /> Matrix Spike Du 2010131-MSDI) Source 5201093-01 Prepared&Analyzed 01/11/02 <br /> Benzene 27 2 1 0 ug/l 25 0 ND 109 60-140 1 11 25 <br /> Methyl tert-butyl ether 243 050 25 0 ND 972 60-140 21 4 25 <br /> Chlorobenzene 265 1 0 25 0 ND 106 60-140 0 752 25 <br /> 1,1-Dtchloroethene 235 1 0 25 0 ND 940 60-140 0 847 25 <br /> Toluene 277 1 0 25 0 ND 111 60-140 2 14 25 <br /> Tnchloroethene 23 5 10 25 0 ND 910 60-140 1 72 25 <br /> Surrogate 1 2-DCA-d4 25 3 15 0 101 60-140 <br /> Surrogate Dibromofluoromethane 229 250 91 6 70-130 <br /> Surrogate 1 2-DCA-d4 253 250 101 70-130 <br /> Surrogate Toluene-d8 255 " 25 0 102 70-130 <br /> Surrogate 4-8FB 225 25 0 900 70-130 <br /> equoia 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 22 of 23 <br />