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C88S Janis Dr <br /> Sequoia Morgan CA 95057 <br /> S <br /> � (4040 8) 776 9600 <br /> 18) 7826308 <br /> www oq <br /> Analytical www <br /> scguoi slabs coin <br /> i <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595, Stockton, CA MNG0109 <br /> 3017 Kilgore Rd Suite 100 Project Number 62546 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 20 24 <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 4G14020-EPA 5030B Pfr <br /> Matrix Spike Du (4G14020-MSDI) Source MNG0175-06 Prepared&Analyzed 07/14/04 <br /> Benzene 6090 50 ug/l 640 5400 108 69-124 4 20 <br /> Ethylbenzene 3660 50 696 2700 138 84-132 7 20 QM01 <br /> Methyl tert-butyl ether 857 50 992 320 54 63-137 8 20 QM02 <br /> Toluene 10700 50 2970 7200 118 78-129 7 20 <br /> Xylenes(total) 13700 50 3370 9500 125 83-137 7 20 <br /> Gasoline Range Organics(C4-C12) 116000 5000 44000 71000 102 70-124 9 20 <br /> Surrogate 1,2-Drchloroethane-d4 219 2 50 88 78-129 <br /> Batch 4G15001-EPA 5030B P/r <br /> Blank 4G15001-BLKI) Prepared&Analyzed 07/15/04 <br /> eAmyl methyl ether ND 050 ugA <br /> nzene ND 050 " <br /> tert-Butyl alcohol ND 5 0 " <br /> Di-Isopropyl ether ND 050 " <br /> 1,2-Mbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasolme Range Organics(C4-C 12) ND 50 " <br /> Surrogate 1 2-Drchloroethane-d4 4 88 5 00 98 78-129 <br /> Laboratory Control Sample(4G15001-BS1) Prepared&Analyzed 07/15/04 <br /> tert-Amyl methyl ether 11 1 050 ugll 100 111 82-140 <br /> Benzene 105 050 too 105 69-124 <br /> tert-Butyl alcohol 52 9 5 0 Soo 106 56-131 <br /> Di-isopropyl ether 114 050 10 0 114 76-130 <br /> 1 2-Dibromoethane(EDB) 101 050 10 0 101 77-132 <br /> 1 2-Dichloroethane 101 050 10 0 101 77-136 <br /> Ethanol 213 100 200 106 31-143 <br /> Ethyl tert butyl ether 1 l 6 050 10 0 116 81-121 <br /> Ethylbenzene 11 1 050 100 111 84-132 <br /> Methyl tert butyl ether 992 050 100 99 63-137 <br /> Sequoia Analytical- Morgan Hil I The results+n!lrrs repor[apply to the samples analyzed ut accordance with the chain of <br /> custod} document Unless otlrerwrse staled results are reporled on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 21 <br />