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.1 <br /> 1Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Z— (707)792-1865Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2I30,Stockton,CA 1`312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Orgamc Compounds by EPA Method 8260B-Quahty Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limas RPD Limit Notes <br /> Batch 3120675-EPA 5030B waters <br /> Matnx Spike 3120675-MS1 Source P312317-10 Prepared&Analyzed 12/23/03 <br /> Tert-amyl methyl ether 530 1 0 ug/l 5 00 ND 106 78-117 <br /> Benzene 508 050 500 ND 102 81-118 <br /> Tert-butyl alcohol 102 20 100 ND 102 60-147 <br /> Di-isopropyl ether 5 48 1 0 5 00 ND 110 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 21 0 50 5 00 ND 104 85-125 <br /> 1,2-Dtchloroethane 5 42 0 50 5 00 ND 108 77-126 <br /> Ethanol 101 100 100 ND 101 55-200 <br /> Ethylbenzene 5 31 0 50 500 ND 106 89-122 <br /> Ethyl tert-butyl ether 5 10 1 0 500 ND 102 71-120 <br /> Methyl tert-butyl ether 5 38 0 50 500 ND 108 70-122 <br /> Toluene 498 050 5 00 ND 100 84-119 <br /> Xylenes(total) 160 050 15 0 ND 107 86-132 <br /> urrogate DibromoJluoromethane 653 „ 6 00 109 84-122 <br /> Surrogate 12-Dtchloroethane-d4 633 600 106 74-135 <br /> Surrogate Toluene d8 6 08 600 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 619 6 00 103 86-119 <br /> Matnx Spike Dup(3120675-MSD1) Source P312317-10 _ Prepared&Analyzed 12/23/03 <br /> Tert-amyl methyl ether 496 1 0 ug/l 5 00 ND 99 78-117 7 20 <br /> Benzene 5 02 050 5 00 ND 100 81-118 1 20 <br /> Tert-butyl alcohol 113 20 100 ND 113 60-147 10 20 <br /> Do-isopropyl ether 5 38 1 0 5 00 ND 108 70-125 2 20 <br /> 1,2-Dtbromoethane(EDB) 5 12 0 50 500 ND 102 85-125 2 20 <br /> I,2-Dtchloroethane 5 25 0 50 5 00 ND 105 77-126 3 20 <br /> Ethanol 145 100 100 ND 145 55-200 36 20 QR-02 <br /> Ethylbenzene 524 0 50 500 ND 105 89-122 1 20 <br /> Ethyl tert-butyl ether 499 1 0 500 ND 100 71-120 2 20 <br /> Methyl tert-butyl ether 545 050 500 ND 109 70-122 1 20 <br /> Toluene 4 90 0 50 " 500 ND 98 84-119 2 20 <br /> Xylenes(total) 16 1 0 50 15 0 ND 107 86-132 0 6 20 <br /> Surrogate Dibromofluoromethane 634 600 106 84-111 <br /> Surrogate 1,24)rchloroethane-d4 6 14 600 102 74-135 <br /> Surrogate Toluene-d8 6 11 6 00 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 622 6 00 104 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 30 of 35 <br />