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885 Jarvis Drive <br /> il CA 95037 <br /> Sequoia Morgan(408)776-9600 <br /> 1%W Analytical wwsegFAX 8ialabs 308 <br /> www sequoialabs corn <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO 42133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco 42133, Stockton,CA Reported <br /> Rancho Cordova CA, 95670 Project Manager Brian Carey 03/31/06 14 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6C16020- EPA 5030B P/T/EPA 8260B <br /> Blank(606020-BLM) Prepared&Analyzed 03/16/06 <br /> Surrogate Dibromofluoromethane 232 u9/1 150 93 65-130 <br /> Surrogate 4-Bromafluorobemene 218 250 91 70-120 <br /> Laboratory Control Sample(6C16020-BSI) Prepared 03/16/06 Analyzed 03/17/06 <br /> tert Amyf methyl ether- - -- - -- -154 — -- 0 50-= ugA - 16 3- -- - 94 - 80-115-- - -- - - _-- <br /> Benzene 548 050 1. 504 109 65-115 <br /> tert Butyl alcohol 147�20�- 169 8775-150 <br /> -Di isopropyl ether - -- 188 050 - 162 - 116 75-125 <br /> I 2-Dibromoethane(EDB) 14 9 0 50 16 6 90 85=120 <br /> 1,2 Dichloroethane 119 050 15 5 76 85-130 HM,PF <br /> Ethanol 207 300 165 125 70-135 IC <br /> Ethyl tert-butyl ether 155 050 164 95 75-130 <br /> Ethylbenzene 727 050 728 100 75-135 <br /> Methyl tert bury[ether 686 050 784 88 65-125 <br /> Toluene 360 050 380 95 85-120 <br /> Xylenes(total) 44 1 050 408 108 85-125 <br /> Gasoline Range Organics(C4-C12) 432 50 440 98 60-140 <br /> Surrogate 1 2-Dichloroeihane-d4 181 250 72 60-135 <br /> Surrogate Toluene-d8 260 250 104 70-120 <br /> Surrogate Wromofluoromethane 233 2 50 93 65-130 <br /> Suri ogaie 4-Bromofluoroben_ene 140 250 96 70-120 <br /> Laboratory Control Sample Dup(6C16020-BSDI) Prepared 03/16/06 Analyzed 03/17/06 <br /> tert Amyl methyl ether 159 050 ug/l 163 98 80-115 3 15 <br /> Benzene 578 050 504 115 65-115 5 20 <br /> tert-Butyl alcohol 145 20 169 86 75-150 1 25 <br /> Di isopropyl ether 193 050 162 119 75-125 3 15 <br /> l 2-Dibromoethane(EDB) 149 050 166 90 85-120 0 15 <br /> 1 2-Dichloroethane 117 050 155 75 85-130 09 20 HM PF <br /> Ethanol 225 300 165 136 70-135 8 35 HL,IC <br /> Ethyl Cert-butyl ether 159 050 164 97 75-130 3 25 <br /> Ethylbenzene 759 050 728 104 75-135 4 15 <br /> Methyl tert-butyl ether 686 050 784 88 65-125 0 20 <br /> Toluene 369 050 380 97 85-120 2 20 <br /> Xylenes(total) 460 050 408 113 85-125 4 20 <br /> Gasoline Range Organics(C4-C 12) 453 50 440 103 60-140 5 25 <br /> Sequoia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> � <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page IS of 20 <br />