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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma CA 949544 <br /> (707)792-1865 <br /> ��► Analytical FAX(707)792-0342 <br /> www sequoialabs comom <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <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 5030212-EPA 5030E waters 1 EPA 8260B <br /> Matrix Spike(5030212-MSI) Source P503218-03 Prepared&Analyzed 03/21/05 <br /> Tert-amyl methyl ether 486 1 0 ugll 500 ND 97 78-117 <br /> Benzene 497 050 500 ND 99 81-118 <br /> Tert-butyl alcohol 104 20 100 ND 104 60-147 <br /> Di-isopropyl ether 488 l 0 500 ND 98 70-125 <br /> 1,2-Dibromoethane(EDB) 5 13 050 500 ND 103 85-125 <br /> 1 2-Dichloroethane 541 050 500 ND 108 77-126 <br /> Ethanol 138 100 100 ND 138 55-200 <br /> Ethylbenzene 5 31 050 500 020 102 89-122 <br /> Ethyl tert-butyl ether 4 79 l 0 500 ND 96 71-120 <br /> Methyl tert-butyl ether 499 050 500 ND 100 70-122 <br /> Toluene 5 13 050 5 00 ND 103 84-119 <br /> AdWylenes(total) 16 1 050 ISO 080 102 86-132 <br /> urrogate Dibromofluoromethane 587 500 117 84-121 <br /> Surrogate 1 2-Dichloroethane-d4 584 500 117 74-135 <br /> Surrogate Toluene-d8 531 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 540 500 108 86-119 <br /> Matrix Spike Dup(5030212-MSD]) Source P503218-03 Prepared&Analyzed 03/21/05 <br /> Tert-amyl methyl ether 504 1 0 ug/1 500 ND 101 78-117 4 20 <br /> Benzene 470 050 500 ND 94 81-118 6 20 <br /> Tert-butyl alcohol 117 20 100 ND 117 60-147 12 20 <br /> Di-isopropyl ether 4 88 10 5 00 ND 98 70-125 0 20 <br /> 1,2-Dibromoethane(EDB) 509 0 50 500 ND 102 85-125 1 20 <br /> 1,2-Dichloroethane 527 0 50 500 ND 105 77-126 3 20 <br /> Ethanol 117 100 100 ND 117 55-200 16 20 <br /> Ethylbenzene 520 0 50 5 00 020 100 89-122 2 20 <br /> Ethyl tert-butyl ether 4 83 10 5 00 ND 97 71-120 0 8 20 <br /> Methyl tert-bury]ether 504 050 500 ND 101 70-122 1 20 <br /> Toluene 484 050 5 00 ND 97 84-119 6 20 <br /> Xylenes(total) 15 1 0 50 15 0 080 95 86-132 6 20 <br /> Surrogate Dibromofluoromethane 581 500 116 84-121 <br /> Surrogate 12-Dichloroethane-d4 5 79 500 116 74-135 <br /> Surrogate 7'oluene-d8 533 500 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 553 500 111 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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 18 <br />