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DrLVC <br /> a_ _� (4019) <br /> 885 JarvisSequoia Morgan Hil I CA 450J750317 776 9300 <br /> Analytical FAX(408)782 3308 <br /> www sequoialabs com <br /> Sector-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Project Number 36984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/28/04 16 50 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPA Limit Notes <br /> Batch 4010373-EPA 5030B waters <br /> Blank 4010373-BLK1 Pre ared&Analyzed 01/21/04 <br /> 1,2-Dichlorobenzene ND 050 ug/l <br /> 1,3-Dichlorobenzene ND 050 " <br /> 1,4-Dichlorobenzene ND 050 <br /> Chlorobenzene ND 050 " <br /> Tert amyl methyl ether ND 1 0 " <br /> Benzene ND 0 50 " <br /> Tort-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> • Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 <br /> I <br /> Methyl cert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 637 600 106 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 583 6 00 97 74-135 <br /> Surrogate Toluene-d8 656 " 600 109 84-119 <br /> Surrogate 4-Bromo luorobenzene 640 600 107 86-119 <br /> Laboratory Control Sample(4010373-BSI) Prepared&Analyzed 01/21/04 <br /> Tert-amyl methyl ether 5 19 1 0 ug/l 500 104 78-117 <br /> Benzene 5 38 050 500 108 81418 <br /> Tert-butyl alcohol 104 20 100 104 60-147 <br /> Di-isopropyl ether 506 1 0 500 113 70-125 <br /> 1,2-Dibromoethane(EDB) 5 08 050 500 102 85-125 <br /> 1,2-Dichloroethane 4 80 050 500 96 77-126 <br /> Ethanol 93 3 100 " 100 93 55-200 <br /> Ethylbenzene 543 0 50 500 109 89 122 <br /> Ethyl tert-butyl ether 4 86 1 0 " 5 00 98 71-120 <br /> Methyl tent-butyl ether 482 0 50 500 96 70-122 <br /> Toluene 4 75 050 500 95 84-119 <br /> Xylenes(total) 169 0 50 15 0 113 86-132 <br /> Surrogate Dibromojluoromethane 651 600 108 84-122 <br /> Surrogate 11-Dichloroethane-d4 606 600 101 74-135 <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 to its entirety <br /> Page 21 of 30 <br />