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895 Jarvis Drive <br /> Sequoia <br /> Morgan Hip CA 950375037 <br /> 4D (408)776 9600 <br /> FAX(408)782 6308 <br /> Analytical www sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project 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 level Result %REC Limits RPD Limit Notes <br /> Batch 4G22001 -EPA 5030B PIT <br /> Laboratory Control Sample(4622001-BS2) Prepared&Analyzed 07/22/04 <br /> Benzene 536 0 50 ug/l 640 84 78-124 <br /> Ethylbenzene 806 0 50 696 116 84-117 <br /> Methyl tert butyl ether 827 050 992 83 63-137 <br /> Toluene 31 7 050 29 7 107 78-129 <br /> Xylenes(total) 397 050 33 7 118 83-125 <br /> Gasoline Range Organics(C4-C 12) 432 50 440 96 70-124 <br /> Surrogate I 1-Dichloroethane-d4 225 250 90 78-129 <br /> Laboratory Control Sample Dup(4G22001-BSDI) Prepared&Analyzed 07/22/04 <br /> tert Amyl methyl ether 9 72 0 50 ug/i 100 97 56-140 6 12 <br /> Benzene 892 0 50 100 89 78-124 10 12 <br /> ert-Butyl alcohol 902 20 " 500 180 0-206 18 22 <br /> i-isopropyl ether 9 48 050 100 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 too 200 150 31-186 24 37 IC <br /> Ethyl cert-butyl ether 976 050 100 98 61-141 2 9 <br /> Ethylbenzene 9 62 050 100 96 84-117 6 10 <br /> Methyl tert-butyl ether 955 050 100 96 63-137 7 13 <br /> Toluene 9 11 050 10 0 91 78-129 8 10 <br /> Xylenes(total) 294 050 30 0 98 83-125 6 11 <br /> Surrogate 12-Dichloroethane-d4 229 250 92 78-119 <br /> Matrix Spike(4G22001-MSI) Source MNG0318-02 Prepared&Analyzed 07/22/04 <br /> Benzene 896 50 ugll 640 380 81 78-124 <br /> Ethylbenzene 2500 50 696 2100 57 84-117 LN <br /> Methyl tent-butyl ether 5270 50 992 5800 NR 63-137 LN <br /> Toluene 3220 50 2970 24 108 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-I24 LM <br /> Surrogate l 2-Dichloroethane-d4 228 2 50 91 78-129 <br /> equoia 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 />