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a— ) (4Sequoia 885vis <br /> MorgaHill n Hdl CA 95037 5037 <br /> Analytical <br /> 08)772-%00 <br /> y FAX(408)78 2-6308 <br /> WWW sequoialabs.4s com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNJ0793 <br /> 3017 Kilgore Rd Suitt 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11112/04 12 23 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPO <br /> M+lyk Result Lmit Units Level Result %REC b-As RPD CAmn Notes <br /> Batch 4KO4005-EPA 5030E Pfr/EPA 8260E <br /> laboratory Control Sample(4K04005-BSI) Prepared&Analyzed 11/04/04 <br /> Toluene 107 0 50 agA 100 107 78 129 <br /> Xylenes(total) 334 050 300 111 83-137 <br /> Surrogate 1,1-Dichloroethane d4 215 150 86 78 119 <br /> Laboratory Control Sample(4K04005-BSZ) Prepared&Analyzed 11/04/04 <br /> Benzene 546 0 50 u8A 640 85 69-124 <br /> Ethylbenzene 824 050 7 51 110 84 132 <br /> Methyl tent-butyl ether 104 0 50 9 92 105 63-137 <br /> Toluene 316 050 31 9 99 78-129 <br /> Xylenes(total) 394 0 50 366 108 83 137 <br /> Gasoline Range Organics(C4-C 12) 410 50 440 93 70-124 <br /> Surrogate 1,1-Dichloroethane44 115 " 150 86 78-119 <br /> Laboratory Control Sample Dup(4K04005-BSD 1) Prepared&Analyzed 11/04/04 <br /> tat-Amyl methyl ether 104 0 50 ugA 100 104 82-140 6 20 <br /> Benzene 100 050 100 100 69-124 3 20 <br /> tert-Butyl alcohol 559 20 " 500 112 56 131 10 20 <br /> Di-isopropyl ether 110 0 50 too 110 76-130 3 20 <br /> 1,2-Dikotnoeftne(EDB) 101 0 50 100 101 77-132 3 20 <br /> 1,2-Dichloroethane 942 050 100 94 77-136 0 1 20 <br /> Ethanol 205 100 200 102 31 143 8 20 <br /> Ethyl tent-butyl ether 116 050 too 116 81-121 4 20 PR <br /> Ethylbenzene 110 0 50 too 110 84-132 4 20 <br /> Methyl tort-butyl ether 106 050 too 106 63-137 9 20 <br /> Toluene 101 0 50 " 100 101 78-129 6 20 <br /> Xylenes(total) 32 4 050 300 108 83-137 3 20 <br /> Surrogate 1,1-Dichloroethane d4 199 130 80 78-119 <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 /> 77ils analytical report must be reproduced in its entirety <br /> Page 18 of 22 <br />