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Sequoia 1455 McDowell Blvd,North Ste <br /> PPetaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical ww4Dw <br /> sequ7ialabs 342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 1145 <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 Lmut Notes <br /> Batch 3090671 -EPA 5030 waters <br /> Laboratory Control Sample(3090671-BS1) Prepared&Analyzed 09/30/03 <br /> Tert-amyl methyl ether 479 10 UO 500 96 70-116 <br /> Benzene 557 050 500 111 81-118 ` , v <br /> Tert-butyl alcohol 102 20 100 102 62-142 0-14 a`��� V�'�1t7lk <br /> V'r <br /> ther 495 1 0 Soo 99 71-121 <br /> L1,,2'Dibromoehane(EDB)_ 5 95 0_50 500 l 9 92-117 P���a Q-LIM <br /> 1,2-Dichloroethane 572 0 50 500 114 79-126 <br /> Ethanol 902 100 100 90 65-135 <br /> Ethylbenzene 541 050 500 108 89-122 <br /> Ethyl tert-butyl ether 455 1 0 Soo 91 71-110 <br /> Methyl tert-butyl ether 533 050 500 107 77-123 <br /> Toluene 538 050 500 108 84-119 <br /> Xylenes(total) 17 2 0 50 150 115 86-132 <br /> urrogate Dibromofluoromethane 5 03 500 101 84-122 <br /> Surrogate 12-Dichloroethane-d4 -569 5 00 114 74-135 <br /> Surrogate Toluene-d8 5 19 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 469 500 94 86-119 <br /> Laboratory Control Sample Dup(3090671-BSD1) Prepared&Analyzed 09/30/03 <br /> Tert-amyl methyl ether 465 1 0 ug/l 500 93 70-116 3 20 <br /> Benzene 523 050 500 105 81-118 6 20 <br /> Tert-butyl alcohol 100 20 100 100 62-142 2 20 <br /> Di-isopropyl ether 424 10 500 85 71-121 15 20 <br /> 1,2-Dibromoethane(EDB) 563 050 500 113 92-117 6 20 <br /> 1,2-Dtchloroethane 558 050 500 112 79-126 2 20 <br /> Ethanol 99 6 100 100 100 65-135 10 20 <br /> Ethylbenzene 5 11 050 500 102 89-122 6 20 <br /> Ethyl tert-butyl ether 396 10 Soo 79 71-110 14 20 <br /> Methyl tert-butyl ether 472 050 500 94 77-123 12 20 <br /> Toluene 521 050 500 104 84-119 3 20 <br /> Xylenes(total) 160 050 15 0 107 86-132 7 20 <br /> Surrogate Dibromofluoromethane 550 500 110 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 5 76 500 115 74-135 <br /> Surrogate Toluene-d8 528 " 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 83 " 500 97 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 entirety <br /> Page 14 of 15 <br />