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4D (408) <br /> q B85 fervis DriveSe ROIs Morgan Hill CA 95037037 776-9600 <br /> Analytical www (406)782 6308 <br /> w sequoiat$bs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <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 Lamit Notes <br /> Batch 4G23004-EPA 5030B PIT <br /> Laboratory Control Sample(4G23004-BSI) Prepared&Analyzed 07/23/04 <br /> Toluene 961 050 ug/l 100 96 78-129 <br /> Xylenes(total) 310 050 300 103 83-125 <br /> Surrogate 1 1-Dichloroethane-0 219 250 88 78-129 <br /> Laboratory Control Sample(4G23004-BS2) Prepared&Analyzed 07/23/04 <br /> Benzene 5 46 050 UO 640 85 78 124 <br /> Ethylbenzene 793 050 696 114 84-117 <br /> Methyl tert butyl ether 972 0 50 9 92 88 63-137 <br /> Toluene 31 3 0 50 29 7 105 78-129 <br /> Xylenes(total) 39 5 0 50 33 7 117 83 125 <br /> Gasohne Range Organics(C4 C 12) 445 50 440 101 70-124 <br /> •Surrogate 12-Dichloroethane-d4 223 150 89 78-119 <br /> Laboratory Control Sample Dup(4G23004-BSDI) Prepared&Analyzed 07/23/04 <br /> tert Amyl methyl ether 9 80 050 ug/l 100 98 56-140 4 12 <br /> Benzene 937 050 100 94 78-124 0 3 12 <br /> tert-Butyl alcohol 917 20 500 183 0-206 24 22 RB <br /> Di-isopropyl ether 100 0 50 100 100 76-130 0 1 9 <br /> 1,2 Dibromoethane(EDB) 9 80 050 100 98 77-132 3 9 <br /> 1,2 Dichloroethane 101 0 50 100 101 77-136 2 13 <br /> Ethanol 375 100 200 188 31-186 26 37 IC,HL <br /> Ethyl tent butyl ether 9 89 050 100 99 61-141 0 1 9 <br /> Ethylbenzene 100 050 100 100 84-117 1 10 <br /> Methyl tett bury]ether 842 050 100 84 63-137 12 13 <br /> Toluene 946 050 100 95 78-129 2 10 <br /> Xytenes(total) 305 0 50 300 102 83-125 2 11 <br /> Surrogate 1 2-Drchloroethane-d4 207 130 83 78-129 <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 stared results are reported on a wet weight basis <br /> This anatyrtcal report must be reproduced in its entirety <br /> Page 20 of 24 <br />