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•l <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petal—,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Cote-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Organic Compounds by EPA Method 82601B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120631-EPA 5030B waters <br /> Matrix Spike 3120631-MSl Source P312237-08 Prepared 12/22/03 Analyzed 12/23/03 <br /> Tert-amyl methyl ether 3 73 1 0 ug/I 500 ND 75 78-117 Q-LIM <br /> Benzene 4 15 050 5 00 ND 83 81-118 <br /> Tert-butyl alcohol 81 0 20 100 ND 81 60-147 <br /> Di-isopropyl ether 4 18 1 0 Soo ND 84 70-I25 <br /> 1,2-Dibromoethane(EDB) 3 91 050 500 ND 78 85-125 Q-LIM <br /> 1,2-Dichloroethane 423 050 5 00 ND 85 77-126 <br /> Ethanol 82 7 100 100 ND 83 55-200 <br /> Ethylbenzene 4 21 0 50 5 00 ND 84 89-122 Q-LIM <br /> Ethyl tert-butyl ether 3 87 1 0 5 00 ND 77 71-120 <br /> Methyl tert-butyl ether 3 88 0 50 5 00 ND 78 70-122 <br /> Toluene 431 0 50 500 0 17 83 84-119 Q-LIM <br /> Xylenes(total) 12 4 050 150 ND 83 86-132 Q-LIM <br /> W-171ate Dibromofluoromethane 5 18 5 00 104 84-122 <br /> 1� <br /> urrogate 1 2-Dtchloroethane-d4 5 13 5 00 10.3 74-135 <br /> Surrogate Toluene-d8 4 77 500 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 507 5 00 101 86-119 <br /> Matrix Spike Dup(3120631-MSD1) Source P312237-08 - Prepared 12/22/03 Analyzed 12/23/03 <br /> Tert-amyl methyl ether 4 82 1 0 ugll 5 00 ND 96 78-117 25 20 QR-07 <br /> Benzene 5 06 050 5 00 ND 101 81-118 20 20 <br /> Tert-butyl alcohol 960 20 100 ND 96 60-147 17 20 <br /> Di-isopropyl ether 5 19 1 0 5 00 ND 104 70-125 22 20 QR-07 <br /> 1,2-Dibromoethane(EDB) 5 06 0 50 5 00 ND 101 85-125 26 20 QR-07 <br /> 1,2-Dtchloroethane 5 27 050 5 00 ND 105 77-126 22 20 QR-07 <br /> Ethanol 952 100 100 ND 95 55-200 14 20 <br /> Ethylbenzene 5 11 050 500 ND 102 89-122 19 20 <br /> Ethyl tert-butyl ether 493 1 0 5 00 ND 99 71-120 24 20 QR-07 <br /> Methyl tert-butyl ether 4 93 050 500 ND 99 70-122 24 20 QR-07 <br /> Toluene 5 13 0 50 5 00 0 17 99 84-119 17 20 <br /> Xylenes(total) 15 2 050 15 0 ND 101 86-132 20 20 <br /> Surrogate Dibromofluoromethane 4 99 5 00 100 84-111 <br /> Surrogate 12 Dichloroethane-d4 5 10 5 00 102 74-135 <br /> Surrogate Toluene-d8 4 72 5 00 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 21 500 104 86-119 <br /> Sequoia Analytical-Petaluma 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 28 of 35 <br />