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N � <br />• 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> • www sequotalabs cam <br /> (IRS Corp-Sacramento Project Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 051I9105 11 20 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5050092 -EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample(5050092-BSI) Prepared&Analyzed 05/17/05 <br /> Ethyl tert-butyl ether 530 10 mg/m'Air 500 106 71-120 <br /> Ethyl test-butyl ether 1 27 024 ppmv 120 106 71-120 <br /> Methyl tent-butyl ether 571 0 50 mg/m'Air 500 114 70-122 <br /> Methyl tent-butyl ether 1 59 0 14 ppmv 139 114 70-122 <br /> Toluene 467 0 50 mg/m'Air Soo 93 84-119 <br /> Toluene 124 013 ppmv 133 93 84-119 <br /> Xylenes(total) 328 0 12 " 346 95 86-132 <br /> Xylenes(total) 142 0 50 mg/m'Air 150 95 86-132 <br /> Surrogate Dibromofluoromethane 602 1 Soo 120 84-122 <br /> Surrogate Dibromofluoromethane 0 767 ppmv 0 638 120 84-122 <br /> � <br /> ogate 1 2-Dtchloroethane-d4 677 mglm'Air 500 135 74-135 <br /> agate 12-Dtchloroethane-d4 161 ppmv 119 135 74-135 <br /> Surrogate Toluene-d8 4 83 mglm'Air 500 97 84-119 <br /> Surrogate Toluene-d8 118 ppmv 122 97 84-119 <br /> Laboratory Control Sample Dug(5050092-BSD1) Prepared&Analyzed 05/17/05 <br /> Tert-amyl methyl ether 1 13 0 24 ppmv 120 94 78-117 8 20 <br /> Ten-amyl methyl ether 472 1 0 mg/m'Air 500 94 78-117 7 20 <br /> Benzene 136 016 ppmv 157 87 81-118 1 20 <br /> Benzene 435 050 mg/m'Air 500 87 81-118 1 20 <br /> Tert-butyl alcohol 33 8 6 6 ppmv 33 1 102 60-147 3 20 <br /> Tert butyl alcohol 102 20 mem'Air 100 102 60-147 2 20 <br /> Di-isopropyl ether 129 024 ppmv 120 108 70-125 12 20 <br /> Di-tsopropyl ether 538 1 0 mF/m'Air 500 108 70-125 11 20 <br /> Ethylbenzene 4 85 0 50 500 97 89-122 4 20 <br /> Ethylbenzene 112 012 ppmv 115 97 89-122 5 20 <br /> Ethyl Cert-butyl ether 4 64 1 0 mg/m'Air 500 93 71-120 13 20 <br /> Ethyl tent-butyl ether 1 11 024 ppmv 120 92 71-120 13 20 <br /> Methyl tert-butyl ether 509 050 mglm'Air 500 102 70-122 11 20 <br /> Methyl tert butyl ether 142 0 14 ppmv 1 39 102 70-122 11 20 <br /> Toluene 119 013 133 89 84-119 4 20 <br /> Toluene 450 050 mg/m'Air 500 90 84-119 4 20 <br /> Xylenes(total) 3 27 0 12 ppmv 346 95 86-132 0 3 20 <br /> Xylenes(total) 142 050 mg/m'Air 15 0 95 86-132 0 20 <br /> Surrogate Dibromofluoromethane 534 500 107 84-122 <br /> Surrogate Dibromofluoromethane 0 681 ppmv 0 638 107 84-122 <br /> u01a Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wuh the chain of <br /> custody document Unless othenvise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 11 <br />