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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequwalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrrm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 4GO8001-EPA 5030B PfF <br /> Blank(4G08001-BLK1) Prepared&Analyzed 07/08/04 <br /> tert-Amyl methyl ether ND 050 ugll <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 12-Dichloroethane-d4 110 250 84 78-119 <br /> Laboratory Control Sample(4G08001-BS1) Prepared&Analyzed 07/08/04 <br /> Cert-Amyl methyl ether 987 050 ugA 100 99 82-140 <br /> tert-Butyl alcohol 607 20 500 121 56-131 <br /> W <br /> isopropyl ether 994 050 100 99 76-130 <br /> -Dichloroethane 964 050 10 0 96 77-136 <br /> Ethanol 231 100 200 116 31-143 <br /> Ethyl tert-butyl ether 990 050 " 100 99 81-121 <br /> Methyl tert-butyl ether 103 050 " 100 103 63-137 <br /> Surrogate 1,1-Dichloroethane-d4 110 150 84 78-119 <br /> Laboratory Control Sample(4G08001-BS2) Prepared&Analyzed 07/08/04 <br /> Methyl tert-butyl ether 874 050 ug/l 992 88 63-137 <br /> Surrogate 11-Dichloroethane-d4 117 150 87 78-129 <br /> Laboratory Control Sample Dup(4G08001-BSD1) Prepared&Analyzed 07/08/04 <br /> tert-Amyl methyl ether 101 050 ugA 100 101 82-140 2 20 <br /> tert-Butyl alcohol 565 20 500 113 56-131 7 20 <br /> Di isopropyl ether 102 050 100 102 76-130 3 20 <br /> 1,2-Dichloroethane 991 050 100 99 77-136 3 20 <br /> Ethanol 166 100 200 83 31-143 33 20 QC21 <br /> Ethyl tert-butyl ether 102 050 100 102 81-121 3 20 <br /> Methyl tert-butyl ether 109 050 100 109 63-137 6 20 <br /> Surrogate 12 Dichloroethane-d4 217 150 87 78-129 <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 stared results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 38 of 41 <br />