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! <br /> Sequoia u�la 1455 McDowell Blvd,North Ste D i <br /> �7 Petaluma,C 94954 <br /> t1 q .r� ] (707)799 2-1855 + <br /> _ Analytical FAX <br /> (707)792Oom <br /> w - <br /> URS Corp-Sacramento Project: Arco Site 6100,Tracy,CA P306337 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36619 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/02/03 16:43 J <br /> I <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 />!E Batch 3060728-EPA 5030 waters <br /> Blank(3060728-BLK1) Prepared&Analyzed:06/28/03 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Tert-butyl alcohol ND 20 " <br /> i <br /> Di-isopropyl ether ND 1.0 ` <br /> i <br /> Ethanol ND 100 " <br /> E Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 # <br /> I Surrogate:Dibromofluoromethane 4.64 5.00 93 84-122 <br /> Surrogate:1,1-Dichlowethane-d4 3.99 5.00 80 74-135 <br />{ <br /> Surrogate:Toluene-d8 4.64 5.00 93 84-119 J <br /> Laboratory Control Sample(3060728-BSI) Prepared&Analyzed:06/28/03 <br /> Tert-amyl methyl ether 4.71 1.0 ug/1 5.00 94 70-116 <br /> Qrt-butyl alcohol 89.0 20 100 89 62-142 i <br /> i-isopropyl ether 4.23 1.0 5.00 85 71-121 <br /> Ethyl tert-butyl ether 4.23 1.0 5.00 85 71-110 <br /> Methyl tert-butyl ether 4.40 0.50 5.00 88 77-123 <br /> Surrogate:Dibromofluoromethane 4.48 5-00 90 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.30 5.00 86 74-135 <br /> Surrogate:Toluene-d8 4.77 5.00 95 84-119 <br /> Matrix Spike(3060728-MS1) Source:P306337-04 Prepared&Analyzed:06/28/03 <br /> Tert-amyl methyl ether 1030 200 ugtl 1000 ND 103 70-116 <br /> Tert-butyl alcohol 7060 4000 20000 ND 35 62-142 Q-LIM <br /> Di-isopropyl ether 860 200 1000 ND 86 71-121 <br /> Ethyl tert-butyl ether 864 200 1000 ND 86 71.110 <br /> Methyl tert-butyl ether 1120 100 1000 170 95 77-123 <br /> Surrogate:Dibromofluoromethane 4.57 5.00 91 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.04 5.00 81 74-135 <br /> Surrogate:Toluene-d8 4.73 5.00 .95 84-119 <br /> L <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 8 of 10 <br />