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a_ _� Sequoia Hill Cvi: Dave <br /> Morgue Hill CA 95037 <br /> IW Analytical (408)776-.6608 <br /> FAX(1118)782.6308 <br /> www soquotalabs coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MN10793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Beakosky 11/12/04 12 23 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result [emit Units Level Result %REC limits RPD Limn Notes <br /> -1 <br /> Batch 4KO5015-EPA 5030B P/T I EPA 8260E <br /> Laboratory Control Sample(4K05015-BSI) Prepared&Analyzed 11/05/04 <br /> tert-Amyl methyl ether 192 050 ug/I 200 96 82-140 <br /> Benzene 192 050 200 96 69-124 <br /> tent-Butyl alcohol 100 20 " 100 100 56-131 <br /> Di-tsopropyl ether 203 050 " 200 102 76-130 <br /> 1,2-Dibromoethane(EDB) 192 050 200 96 77 132 <br /> 1,2-Dichloroethane 190 050 200 95 77-136 <br /> Ethanol 360 100 400 90 31 143 <br /> Ethyl tori butyl ether 206 050 200 103 81-121 <br /> Ethylbeazene 209 050 200 104 84-132 <br /> Methyl tett-butyl ether 200 050 200 100 63 137 <br /> Toluene 197 050 200 98 78 129 <br /> Xylenes(total) 632 050 600 105 83-137 <br /> Surrogate 1 1-Dichloroethane-d4 404 Soo 81 78-119 <br /> tAborato Control Sample(4K05015-BS2) Prepared&Analyzed 11/05/04 <br /> Benzene 588 0 54 ugR 640 92 69 124 <br /> Ethylbenzene 856 050 752 114 84-132 <br /> Meryl tect-butyl ether 990 050 992 100 63-137 <br /> Toluene 339 050 319 106 78-129 <br /> Xylenes(total) 418 050 366 114 83-137 <br /> C}mime Range Organics(C4-C12) 497 So " 440 113 70 124 <br /> Surrogate 1,1-Dichloroethane-d4 367 " Soo 73 78 119 LG <br /> Laborato Control Sample Du (4K05015-BSDI) Prepam el&Analyzed 11/05/04 <br /> tert-Amyl methyl ether 201 050 ugll 200 100 82-140 5 20 <br /> Benzene 200 050 200 100 69 124 4 20 <br /> tert-Butyl alcohol 101 20 100 101 56 13I 1 20 <br /> l3t'tsOPropyl ether 213 050 200 106 76 130 5 20 <br /> 1,2-Dlbmmoethane(EDB) 196 050 200 98 77-132 2 20 <br /> 1,2-Dichlorocthane 192 050 200 96 77-136 1 20 <br /> Ethanol 356 100 400 89 31-143 1 20 <br /> Ethyl tent-butyl ether 212 050 200 106 81 121 3 20 <br /> Ethylbenzene 218 050 200 109 84 132 4 20 <br /> Methyl tert-butyl ether 20 3 050 200 102 63 137 _ 1 20 <br />- ——Toluene =- - - - 203 050 200 102 78-129 3 20 <br /> Xylenes(total) 673 0 50 600 112 83-137 6 20 <br /> Sequoia Analytical-Morgan Hill The results to this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 79tis analytical report mutat be reproduced in its entirety <br /> Page 20 of 22 <br />