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es Sequoia 1455 McDowelI Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> a— ) (707)792-1865Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <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 3120709-EPA 5030B waters <br /> Laboratory Control Sample 3120709-BSI Prepared&Analyzed 12/24/03 <br /> Tert-amyl methyl ether 479 1 0 U91 500 96 78-117 <br /> Benzene 482 0 50 500 96 81-118 <br /> Tert-butyl alcohol 895 20 100 90 60-147 <br /> Di-isopropyl ether 5 39 1 0 5 00 108 70-125 <br /> 1,2-Dibromoethane(EDB) 489 050 5 00 98 85-125 <br /> 1,2-Dichloroethane 5 20 050 5 00 104 77-126 <br /> Ethanol 116 100 100 116 55-200 <br /> Ethylbenzene 460 050 5 00 92 89-122 <br /> Ethyl teri-butyl ether 535 1 0 500 107 71-120 <br /> Methyl tert-butyl ether 5 10 0 50 500 102 70-122 <br /> Toluene 4 78 0 50 500 96 84-119 <br /> Xylenes(total) 14 1 050 15 0 94 86-132 <br /> W <br /> rrogate Dibromofluoromelhane 5 11 5 00 102 84-122 <br /> rrogate 1,2-Dichloroethane-d4 527 5 00 105 74-135 <br /> Surrogate Toluene-d8 5 0.3 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 5 00 104 86-119 <br /> Laboratory Control Sample Dup(3120709-BSD1� Prepared 12124/,.0, 3 <br /> Analyzed 12/25/03 <br /> Teri-amyl methyl ether _ <br /> 4 59 1 0 ug/l 5 00 92 79-117 4 20 <br /> Benzene 4 86 0 50 5 00 97 81-118 0 8 20 <br /> Tert-butyl alcohol 973 20 100 97 60-147 8 20 <br /> Di-isopropyl ether 678 1 0 5 00 136 70-125 23 20 Q-29 <br /> 1,2-Dtbromoethane(EDB) 4 68 050 5 00 94 85-125 4 20 QR-07 <br /> 1,2-Dichloroethane 5 28 050 5 00 106 77-126 2 20 <br /> Ethanol 115 100 100 115 55-200 0 9 20 <br /> Ethylbenzene 4 69 050 5 00 94 89-122 2 20 <br /> Ethyl tert-butyl ether 606 1 0 5 00 121 71-120 12 20 Q-29 <br /> Methyl tert-butyl ether 607 0 50 500 121 70-122 17 20 <br /> Toluene 477 0 50 5 00 95 84-119 0 2 20 <br /> Xylenes(total) 14 1 0 50 150 94 86-132 0 20 <br /> Surrogate Dibromofluoromethane 533 500 107 84-122 <br /> Surrogate I 1-Dichloroelhane-d4 557 5 00 111 74-135 <br /> Surrogate Toluene-d8 517 5 00 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 532 5 00 106 86-119 <br /> Sequoia Analytical-Petahuna The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated results are reported on a wet weight <br /> . basis This analytical report must be reproduced in its entirety <br /> Page 34 of 35 <br />