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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (4040 8)776 9600 <br /> �r Analytical FAX ]a6308 <br /> www sequoiquoialabs com <br /> 0 <br /> SeCOr- Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 <br /> 3017 Kitgore Rd Sate 100 Project Number Arco#2133, 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 %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6CO9034- EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(6C09034-BS2) Prepared 03/09/06 Analyzed 03/10/06 <br /> Cert-Arryk methyl ether 160 050 ugA 163 98 80-115 <br /> Benzene 5 Il 050 504 101 65-115 <br /> tert Butyl alcohol 154 20 169 91 75-150 <br /> Di isopropyl ether 155 050 162 96 75-125 <br /> 1,2-Dibromoethane(EDB) 157 050 166 95 85-120 <br /> 1,2-Dichloroethane 144 050 155 93 85-130 <br /> Ethanol 161 300 165 98 70-135 <br /> Ethyl tert-butyl ether 161 050 164 98 75-130 <br /> Ethylbenzene 7 13 050 7 28 98 75-135 <br /> Methyl teri butyl ether 730 050 7 94 93 65-125 <br /> Toluene 340 0 50 390 89 85-120 <br /> nes(total) 425 0 50 408 104 85-125 <br /> line Range Organics(C4-C12) 449 50 440 102 60-140 <br /> Surrogate 12-Dichloroethane-d4 243 250 97 60-135 <br /> Surrogate Toluene-d8 2 60 2 50 104 70-120 <br /> Surt ogaae Dibromofluoromethane 258 250 103 65-130 <br /> Surrogate 4-Bromofluorobenzene 250 250 100 70-120 <br /> Laboratory Control Sample Dup(6C09034-BSDI) Prepared 03/09/06 Analyzed 03/10/06 <br /> Chlorobenzene 104 0 50 ug/l 100 104 80-120 2 10 <br /> 1 2-Dichlorobenzene 989 050 100 99 80-125 2 10 <br /> l 3 Dichlorobenzene 101 050 10 0 101 75-120 3 10 <br /> l 4-Dichlorobenzene 970 050 100 97 75-120 2 15 <br /> Sui rogate 1 2-Dachloroethane-d4 2 50 250 100 60-135 <br /> Surrogate 4 Bromofluorobeazene 241 2 50 96 70-120 <br /> Surrogate Dibromofluoromeihane 263 250 105 65-130 <br /> Surrogate Toluene-d8 257 250 103 70-120 <br /> quota Analytical - Morgan HILI The results to this report apply to the samples analyzed in accordance with the chain of <br /> 0 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 13 of 20 <br />