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., <br /> �+ 1455 McDowell Blvd,North Ste <br /> Sequoia a Petaluma,CA 94954 <br /> `7 (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs comom <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308085 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 34 <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 /> Batch 3080176-EPA 5030 waters <br /> Laboratory Control Sample(3080176-BSI) Prepared&Analyzed 08/11/03 <br /> Tert-amyl methyl ether 469 10 ug/l 500 94 70-116 <br /> Benzene 490 050 1500 98 81-118 <br /> Tert butyl alcohol 95 1 20 11100 95 62-142 <br /> Di-isopropyl ether 451 10 " 500 90 71-121 <br /> 1,2 Dibromoethane(EDS) 502 050 5 00 100 92-117 <br /> 1,2-Dichloroethane 472 050 Soo 94 79-126 <br /> Ethyl tert butyl ether 439 1 0 500 88 71-110 <br /> Methyl Cert-butyl ether 4 56 050 500 91 77-123 <br /> Toluene 464 050 500 93 84-119 <br /> Surrogate Dibromofluoromethane 465 450 103 84-122 <br /> Surrogate 12-Dichloroethane-d4 438 450 97 74-135 <br /> urrogale Toluene-d8 4 77 450 106 84-119 <br /> rrogate 4-Bromofluorobenzene 461 450 102 86-119 <br /> Laboratory Control Sample Du (3080176-BSDI) Prepared&Analyzed 08/11/03 <br /> Tert-amyl methyl ether 4 85 1 0 ugll 500 97 70-116 3 20 <br /> Benzene 498 050 " 5 00 100 81-118 2 20 <br /> Tert-butyl alcohol 101 20 " 100 101 62-142 6 20 <br /> Di isopropyl ether 479 10 500 96 71-121 6 20 <br /> 1,2-Dibromoethane(EDB) 538 050 11500 108 92-117 7 20 <br /> 1,2-Dichloroethane 496 050 11500 99 79-126 5 20 <br /> Ethyl tert-butyl ether 471 10 1. 500 94 71-110 7 20 <br /> Methyl tertbutyl ether 477 050 " 500 95 77-123 5 20 <br /> Toluene 472 050 " 500 94 84-119 2 20 <br /> Surrogate Dibromofluoromethane 4 79 1450 106 84-111 <br /> Surrogate 12-Dichloroethane-d4 4 53 11450 101 74-135 <br /> Surrogate Toluene-d8 4 72 11450 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 74 450 105 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 wet weight basis <br /> This analytical report must be reproduced in its entrrety <br /> Page 18 of 19 <br />