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1455 McDowell Blvd,North Ste D <br /> Sequoia Petalum 7) 9 <br /> {707}792 792 1965 <br /> 66565 <br /> FAX <br /> � ► Analytical wwsequ7}labsco2 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P409397 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/04 14 29 <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 lamas RPD Limit Notes <br /> Batch 4100021 -EPA 5030E waters/EPA 8260B <br /> Matrix Spike(4100021-MS1) Source P409397-13 Prepared&Analyzed 10/01/04 <br /> Tert-amyl methyl ether 464 10 ugll 500 ND 93 78-117 <br /> Benzene 52 4 5 0 Soo 15 102 81-118 <br /> Tert-butyl alcohol 669 200 1000 ND 67 60-147 <br /> Di-isopropyl ether 478 10 50 0 ND 96 70-125 <br /> 1,2-Dichloroethane 198 5 0 500 140 116 77-126 <br /> Ethanol 1100 1000 1000 ND 110 55 200 <br /> Ethylbenzene 49 8 5 0 50 0 ND 100 89 122 <br /> Ethyl cert-butyl ether 47 3 10 500 ND 95 71-120 <br /> Methyl tert-butyl ether 49 9 5 0 Soo 2 1 96 70-122 <br /> Toluene 494 5 0 500 ND 99 84-119 <br /> Xylenes(total) 152 5 0 150 ND 101 86-132 <br /> ogate Dibromofluoromethane 534 500 107 84-122 <br /> ogate 12-Dichloroethane-d4 541 500 108 74-135 <br /> Surrogate Toluene-d8 5 70 500 114 84-119 <br /> Surrogate 4-Bromofluorobenrene 526 500 105 86-119 <br /> Matrix Spike Dup{4100021-MSD]) Source P409397-13 Prepared&Analyzed 10/01/04 <br /> Tert-amyl methyl ether 46 0 10 ug/I 500 ND 92 78-117 0 9 20 <br /> Benzene 53 5 5 0 500 1 5 104 81-119 2 20 <br /> Teri-butyl alcohol 630 200 1000 ND 63 60-147 6 20 <br /> Di-isopropyl ether 48 1 10 " 500 ND 96 70-125 06 20 <br /> 1 2-Dichloroethane 194 5 0 500 140 108 77-126 2 20 <br /> Ethanol 1260 1000 1000 ND 126 55 200 14 20 <br /> Ethylbenzene 506 5 0 500 ND 101 89-122 2 20 <br /> Ethyl tert-butyl ether 463 10 500 ND 93 71-120 2 20 <br /> Methyl tert-butyl ether 46 2 50 Soo 2 1 88 70-122 8 20 <br /> Toluene 507 5 0 500 ND 101 84 119 3 20 <br /> Xylenes(total) 154 5 0 150 ND 103 86 132 1 20 <br /> Surrogate Dibromofluoromethane 529 500 106 84-122 <br /> Surrogate 12 Drchloroethane-d4 5.38 5 00 108 74-135 <br /> Surrogate Toluene d8 5 71 500 114 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 500 104 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 26 of 29 <br />