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nvt <br /> Sequoia 895 Jarvis 8Morgan Hill,CA 95037037 <br /> (408)776 9600 <br /> Analytical FAX 782 6308 <br /> www sequoequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Protect Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <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 Levo1 Result %REC Limits RPD limit Notes <br /> Batch 4G22001-EPA 5030B P/T <br /> Laboratory Control Sample(4G22001-BS2) Prepared&Analyzed 07/22/04 <br /> Benzene 536 050 ug/l. 640 84 78 124 <br /> Ethylbenzene 806 050 696 116 84 117 <br /> Methyl tert-butyl ether 827 050 992 83 63-137 <br /> Toluene 31 7 050 297 107 78-129 <br /> Xylenes(total) 397 050 33 7 118 83-125 <br /> Gasoline Range Organics(C4-C 12) 432 50 440 98 70 124 <br /> Surrogate 12-Dichloroethane-d4 225 250 90 78-129 <br /> Laboratory Control Sample Dup(4G22001-BSDI) Prepared&Analyzed 07/22/04 <br /> tert-Amyl methyl ether 972 050 ug/I 100 97 56-140 b 12 <br /> Benzene 892 050 100 89 78-124 10 12 <br /> .tert Butyl alcohol 902 20 500 180 0-206 18 22 <br /> Di-isopropyl ether 949 050 100 95 76-130 7 9 <br /> 1,2-Dibromoethane(EDB) 102 050 100 102 77-132 1 9 <br /> 1,2-Dichloroethane 999 050 too 100 77 136 2 13 <br /> Ethanol 301 100 200 150 31 186 24 37 IC <br /> Ethyl tent-butyl ether 976 050 100 98 61-141 2 9 <br /> Ethylbenzene 962 050 loo 96 84-117 6 10 <br /> Methyl cert-butyl ether 955 050 100 96 63-137 7 13 <br /> 'toluene 911 050 100 91 78-129 8 10 <br /> Xylenes(total) 294 0 50 300 98 83-125 6 11 <br /> Surrogate 1 2-Dichloroethane-d4 229 250 92 78 129 <br /> Matrix Spike(4G22001-MSI) Source MNG0318-02 Prepared&Analyzed 07/22/04 <br /> Benzene 896 50 ug/I 640 380 81 78-124 <br /> Ethylbenzene 2500 50 696 2100 57 84-117 LN <br /> Methyl tert-butyl ether 5270 50 992 5800 NR 63-137 LN <br /> Toluene 3220 50 2970 24 106 78-129 <br /> Xylenes(total) 10400 50 3370 7900 74 83-125 LN <br /> Gasoline Range Organics(C4-C12) 83100 5000 44000 59000 55 70-124 LM <br /> Surrogate 1 2-Dichloroethane-d4 228 250 91 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <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 18 of 24 <br />