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Driv <br /> �-.!.� Sequoia 885 Jarvis 5037 <br /> ''���r' Morgan H°ll CA 95037 <br /> �� Analytical (408}7769600 <br /> FAX(4 08)782 6308 <br /> www sequo,alebs co� <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNJ0793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 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 limit Units Level Result %REC Limits RPD limit Notes <br /> Batch 4KO5015-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(4K05015-BSI) Prepared&Analyzed 11/05/04 <br /> tert-Amyl methyl ether 192 050 ugll 200 96 82-140 <br /> Benzene 192 050 " 200 96 69-124 <br /> tert-Butyl alcohol 100 20 100 100 56-131 <br /> Di-isopropyl 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 tert-butyl ether 206 050 200 103 81-121 <br /> Ethylbenzene 209 050 200 104 84-132 <br /> Methyl tert-butyl ether 200 050 200 100 63-137 <br /> Toluene 197 0 50 " 200 98 78-129 <br /> Xylenes(total) 632 050 600 105 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 404 500 81 78-129 <br /> Laborata Control Sample(4K05015-BS2) Prepared&Analyzed 11/05/04 <br /> Benzene 5 88 050 ug/l 640 92 69-124 <br /> Ethylbenzene 856 050 7 52 114 84-132 <br /> Methyl tert butyl ether 990 0 50 992 100 63-137 <br /> Toluene 339 050 319 106 78-129 <br /> Xylenes(total) 41 8 0 50 366 114 83-137 <br /> Gasoline Range Organics(C4-C12) 497 50 440 113 70-124 <br /> Surrogate 12 Dichloroethane-d4 367 " 500 73 78-129 LG <br /> Laboratory Control Sample Dup(4K05015-BSD1) Prepared&Analyzed 11105104 <br /> tert-Amyl methyl ether 201 050 ugll 200 100 82-140 5 20 <br /> Benzene 200 0 50 200 100 69-124 4 20 <br /> tert-Butyl alcohol 101 20 100 101 56-131 1 20 <br /> Di-isopropyl ether 21 3 050 200 106 76-130 5 20 <br /> t 2-Dibremoethane(EDB) 196 050 200 98 77-132 2 20 <br /> 1 2-Dichloroethane 192 0 50 " 200 96 77-136 1 20 <br /> Ethanol 356 100 400 89 31-143 1 20 <br /> Ethyl tert-butyl ether 21 2 0 50 200 106 81-121 3 20 <br /> Ethylbenzene 21 8 0 50 200 109 84-132 4 20 <br /> Methyl tert butyl ether 203 0 50 200 _ 102 _63-137 1_ _ -20 <br /> - —Toluene 720 3 0 50 200 102 78-129 3 20 - — - — — <br /> Xylenes(total) 673 0 50 600 112 83-137 6 20 <br /> Sequoia Analytical -Morgan Hill The results 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 20 of 22 <br />