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(D885 Jarvis Drive <br /> Sequoia NforgaoHdl CA 950375037 <br /> � <br /> Analytical FAX(4 08)776 9600 <br /> (408)762 6396 <br /> www sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595,Stockton,CA MNA0270 <br /> 3017 Kilgore Rd Suite 100 Project Number 38983 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/26/04 14 13 <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 4A19002-EPA 5030E PIT <br /> Laboratory Control Sample(4A19002-BS2)_ Prepared 01/19/04 Analyzed 01/20/04 <br /> Methyl tert-butyl ether 8 99 050 ug/l 992 906 63-137 <br /> Benzene 5 74 0 50 640 897 69-124 <br /> Toluene 324 050 29 7 109 78-129 <br /> Ethylbenzene 765 0 50 6 96 110 84-132 <br /> Xylenes(total) 39 6 0 50 33 7 119 83-137 <br /> Gasoline Range Organics 473 50 440 108 70-113 <br /> Surrogate 12-Dichloroethane-d4 523 500 105 78-129 <br /> Laboratory Control Sample Du 4A19002-BSD! Prepared 01/19/04 Anal zed 01/20/04 <br /> Ethanol 210 100 ug/1 200 105 31-143 11 1 20 <br /> tert-Butyl alcohol 52 2 20 500 104 56-131 6 12 20 <br /> Methyl tert butyl ether 10 6 0 50 " 10 0 106 63-137 6 13 20 <br /> Di isopropyl ether 10 3 050 10 0 103 76-130 1 96 20 <br /> Ethyl Cert-butyl ether 11 4 0 50 10 0 114 81-121 3 57 20 <br /> tent-Amyl methyl ether 11 5 050 10 0 115 82-140 628 20 <br /> 1,2-Dichloroethane 12 0 0 50 10 0 120 77-136 5 13 20 <br /> 1,2-Dibromoethane(EDB) 104 050 10 0 104 77-132 3 77 20 <br /> Benzene 10 1 050 10 0 101 69-124 000 20 <br /> Toluene 991 0 50 10 0 99 1 78-129 2 88 20 <br /> Ethylbenzene 10 1 0 50 10 0 101 84-132 1 30 20 <br /> Xylenes(total) 31 4 050 30 0 105 83-137 0 951 20 <br /> Surrogate 1 2-Dichloroethane-d4 529 5 00 106 78-129 <br /> Matrix Spike 4A19002-MSI) Source MNA0270-09 Prepared 01/19/04 Analyzed 01/20/04 <br /> Methyl tert-butyl ether 0 530 0 50 ug/l 9 92 11 NR 63-137 QM-07 <br /> Benzene 5 43 0 50 640 ND 84 8 69-124 <br /> Toluene 30 3 0 50 297 0 15 102 78-129 <br /> Ethylbenzene 7 13 0 50 696 ND 102 84-132 <br /> Xylenes(total) 36 9 0 50 33 7 ND 109 83-137 <br /> Gasoline Range Organics 547 50 440 ND 124 70-113 QM-07 <br /> Surrogate 1 2-Dichloroethane-d4 2 74 500 54 8 78-129 S-LIM <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 11 of 18 <br />