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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source "/uREC RPD <br /> Analyte Result land Units Level Result %REC Limits RPD Lima Notes <br /> Batch 4090752-EPA 5030B waters/EPA 8260B <br /> Blank(4090752-BLKI) Prepared&Analyzed 09/30/04 <br /> Teri-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> lwogate Dibromafluoromelhane 588 'I 500 118 84-122 <br /> arrogate 1 2-Dichloroethane-d4 5 81 500 116 74 135 <br /> Surrogate Toluene d8 516 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 536 500 107 86-119 <br /> Laboratory Control Sample(4090752-BSI) Prepared&Analyzed 09/30/04 <br /> Tert-amyl methyl ether 444 10 ugll 500 89 78-117 <br /> Benzene 477 050 500 95 81-118 <br /> Tert-butyl alcohol 975 20 100 98 60-147 <br /> I)i-isopropyl ether 461 10 500 92 70-125 <br /> 1,2-Dichloroethane 538 050 500 108 77-126 <br /> Ethanol 206 100 100 206 55-200 HM <br /> Ethylbenzene 486 050 Soo 97 89-122 <br /> Ethyl tett-butyl ether 495 10 500 99 71-120 <br /> Methyl tent-butyl ether 527 050 Soo 105 70-122 <br /> Toluene 462 050 500 92 84-119 <br /> Xylenes(total) 14 2 050 IS 0 95 86-132 <br /> Surrogate Dibromofluoromethane 616 5 00 123 84-122 LH <br /> Surrogate 12-Drchloroerhane-d4 604 500 121 74-135 <br /> Surrogate Toluene-d8 516 500 103 84-119 <br /> Surrogate 4-Bromofluarobenzene 539 500 108 86-119 <br /> i <br /> Sequoia Analyttcal-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 /> 40 This analytical report must be reproduced in its entirety <br /> Page 23 of 29 <br />