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1455 McDowell Blvd North Ste <br /> Segl101a Petaluma,CA 949544 <br /> (707)792-1865 <br /> FAX 1r Analytical wwsequ7ialabs 342 <br /> www sequotalabs coin <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/16/03 08 50 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC "D <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit N.'s <br /> Batch 3060501 -EPA 5030 waters <br /> Blank(3060501-BLK1) Prepared&Analyzed 06/20/03 <br /> Ethanol ND 100 ug/1 <br /> Tert amyl methyl ether ND 10 " <br /> Tert butyl alcohol ND 20 " <br /> Diasopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl teal-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 496 500 99 84-112 <br /> Surrogate I 1-Dichloroethane-d4 529 500 106 74-135 <br /> Surrogate Toluene-d8 519 500 104 84-119 <br /> Laboratory Control Sample(3060501-BSI) Prepared&Analyzed 06/20/03 <br /> Ten amyl methyl ether 496 10 ug/I 500 99 70-116 <br /> Teri-butyl alcohol 113 20 100 113 62-142 <br /> Di-isopropyl ether 503 10 500 101 71-121 <br /> 1,2-Dichlormthane 533 050 5 00 107 79-126 <br /> Ethyl tert-butyl ether 473 10 500 95 71-110 <br /> Methyl tert-butyl ether 508 050 " 500 102 77-123 <br /> Surrogate Dibromofluoromethane 504 500 101 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 507 500 101 74-135 <br /> Surrogate Toluene-d8 535 500 107 84-119 <br /> Laboratory Control Sample Dup(3060501-BSD1) Prepared&Analyzed 06/20/03 <br /> Tei t amyl methyl ether 498 10 ug/I 500 100 70-116 04 20 <br /> Tert-butyl alcohol 114 20 100 114 62-142 09 20 <br /> Di-isopropyl ether 509 10 500 102 71-121 1 20 <br /> 1,2-Dichloroethane 540 050 500 108 79-126 1 20 <br /> Ethyl tert-butyl ether 488 10 500 98 71-110 3 20 <br /> Methyl tert-butyl ether 523 050 500 105 77-123 3 20 <br /> Surrogate Dibromofluoromethane 491 500 98 84-121 <br /> Surrogate 12-Drchloroethane-d4 522 500 104 74-135 <br /> Surrogate Toluene-d8 519 500 104 84-119 <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 13 of 15 <br />