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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA <br /> 03073 <br /> 2870 Gateway Oaks Drive Suite 300 Protect NumbP5er Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth <br /> 03/16/05 14 19 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC �JRPDAnalyte Result Limit Units Level Result '/-REC Limits RPD tNotes <br /> Batch 5030155-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5030155-MSI) Source P503060-02 Prepared&Analyzed 03/15/05 <br /> Tert-amyl methyl ether 508 10 ug/I Soo ND 102 78-117 <br /> Benzene 53 6 50 50 0 3 1 101 81-118 <br /> Tert-butyl alcohol 1080 200 1000 ND 108 60 147 <br /> Di-isopropyl ether 497 10 500 ND 99 70-125 <br /> i,2-Dibromoethane(EDR) 561 5 0 500 ND 112 85-125 <br /> 1 2-Dichloroethane 52 8 50 50 0 3 9 98 77.126 <br /> Ethanol 991 1000 1000 ND 99 55-200 <br /> Ethylbenzene 553 5 0 500 ND 111 89-122 <br /> Ethyl tert-butyl ether 476 10 50 0 ND 95 7I-120 <br /> Methyl tort-bury!ether 138 5 0 500 85 106 70-122 <br /> Toluene 551 5 0 500 1 1 108 84-119 <br /> Xylenes(total) 327 50 150 150 118 86-132 <br /> urrogate Dibromofluoromethane 508 Soo 101 84-171 <br /> Surrogate 11-Drchloroethane-d4 4 68 500 94 74-135 <br /> Surrogate Toluene-d8 5 16 500 103 84-119 <br /> Surrogate 4-Bromofluoroben2ene 549 500 110 86-119 <br /> Matrix Spike Dup(5030155-MSDI) Source P503060-02 Prepared&Analyzed 03/15/05 <br /> Tert-amyl methyl ether 522 10 ug/l 500 ND 104 78-117 3 20 <br /> Benzene 53 6 5 0 500 3 1 101 8I-118 0 20 <br /> Teri-butyl alcohol 1 120 200 1000 ND 112 60-147 4 20 <br /> Di-isopropyl ether 504 10 50 0 ND 101 70-125 1 20 <br /> 1,2-Dibromoethane(EDB) 54 7 5 D 500 ND 109 85-125 3 <br /> 1,2-Dichloroethane 20 <br /> 54 2 5 0 500 3 9 101 77-126 3 20 <br /> Ethanol 1050 1000 1000 ND 105 55-200 6 20 <br /> Ethylbenzene 533 5 0 500 ND 107 89-122 4 <br /> Ethyl tert-butyl other 20 <br /> 483 10 540 ND 97 71-120 1 20 <br /> Methyl tert butyl ether 137 5 4 500 85 104 70-122 0 7 20 <br /> Toluene 552 5 0 500 1 1 108 84-119 0 2 20 <br /> Xylenes(total) 309 5 0 150 150 106 86-132 <br /> 6 20 <br /> Surrogate Dibromofluoromethane 5 14 3 84-121 <br /> Surrogate 11-Dichloroethane-d4 4 92 5 00 S DO 10 0 <br /> Surrogate Toluene-d8 517 Soo 98 74-135 <br /> 84-119 <br /> Surrogate 4-Bromof7uorobenzene 547 5 00 <br /> 109 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 /> 0 This analytical report must be reproduced in its entirety <br /> Page 18 of 19 <br />