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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a— )� Analytical FAX(707)792-0342 <br /> unvw sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 <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 RPD Limit Notes <br /> Batch 5030140-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5030140-MSI) Source P503073-10 Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether 500 10 ugA 500 ND 100 78-117 <br /> Benzene 503 050 500 ND 101 81-118 <br /> Tert butyl alcohol 895 20 100 ND 90 60-147 <br /> Di-isopropyl ether 506 10 500 ND 101 70-I25 <br /> 1 2-Dibromoethane(EDB) 5 13 050 500 ND 103 85-125 <br /> 1,2-Dichloroethane 5 11 050 500 ND 102 77-126 <br /> Ethanol 109 100 100 ND 109 55-200 <br /> Ethylbenzene 539 050 500 ND 108 89-122 <br /> Ethyl tert-butyl ether 480 10 500 ND 96 71-120 <br /> Methyl tert-butyl ether 498 050 500 ND 98 70-122 <br /> Toluene 516 050 Soo ND 103 84-119 <br /> Xylenes(total) 157 050 150 ND 105 86-132 <br /> urrogate Dibromofluoromethane 563 500 113 84-122 <br /> Surrogate 12-Dichloroethane-d4 545 500 109 74-135 <br /> Surrogate Toluene-d8 542 500 108 84-119 <br /> Surrogate 4-Bromofluorobenzene 545 500 109 86-119 <br /> Matrix Spike Dup(5030140-MSD1) Source P503073-10 Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether 452 10 ug/l Soo ND 90 78-117 10 20 <br /> Benzene 5 15 050 Soo ND 103 81-119 2 20 <br /> Tert-butyl alcohol 118 20 100 ND 118 60-147 27 20 RB <br /> Di-isopropyl ether 479 30 500 ND 96 70-125 5 20 <br /> 1 2 Dibromoethane(EDB) 4 69 050 500 ND 94 85-125 9 20 <br /> 1 2-Dichloroethane 482 050 500 ND 96 77-126 6 20 <br /> Ethanol 133 100 100 ND 133 55-200 20 20 <br /> Ethylbenzene 588 050 500 ND 118 89-122 9 20 <br /> Ethyl tent-butyl ether 439 10 500 ND 88 71-120 9 20 <br /> Methyl tent butyl ether 444 050 Soo ND 89 70-122 9 20 <br /> Toluene 533 050 500 ND 107 84-119 3 20 <br /> Xylenes(total) 167 050 150 ND 111 86-132 6 20 <br /> Surrogate Dibromofluoramethane 537 500 107 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 502 500 100 74-135 <br /> Surrogate Toluene-d8 532 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 555 500 111 86-119 <br /> Sequoia Analytical -Petaluma 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 we/weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 19 <br />