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885 Jarvis Drive <br /> Morgan Hill CA 95037 <br /> Sequoia (408)776 9600 <br /> a_ � <br /> www <br /> seq <br /> www eqAnalytical 8)782 6308 <br /> uoialabs coin <br /> Sector-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 03/31/06 14 03 <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 6C13001 -EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(6C13001-BSD2) Prepared&Analyzed 03/13/06 <br /> teri-Amyl methyl ether 121 050 ug/) 100 121 80-115 4 15 HL <br /> Benzene 108 0 50 10 0 108 65-115 5 20 <br /> Cert Butyl alcohol 185 20 200 92 75-150 3 25 <br /> Chlorobenzene10 4 050 100 104 80-120 3 10 <br /> Di-isopropyl ether-- - - - _ - 114 V - -- 050 " _ i0 0�- ---- - 114-- 75-125 --- 5 -15- - - - — - - <br />=1-2-Dibrornoethane(EDB) 109 0 50 ' 100 109 85-120 4 15 <br /> k 2 Dichlorobenzene10 2 050 10 0 102 86-125 4-10 <br />=1;3-Dichlorobenzene w 102 050 100 _ 102- 75-120 5 - 10 - <br /> 1 4 Dichlorobenzene 102 0 50 10 0 102 75-120 4 15 <br /> 1 2 Dichloroethane 104 050 10 0 104 85-130 4 20 <br /> Ethanol 209 300 200 104 70-135 6 35 <br /> Ethyl ten-butyl ether 118 0 50 100 118 75-130 4 25 . <br /> Ethylbenzene 946 050 10 0 95 75-135 3 15 <br /> Methyl tert butyl ether 119 0 50 10 0 _ 119 65-125 2 20 <br /> Toluene 106 0 50 100 106 85-120 6 20 <br /> Xyk,nes(total) 28 7 0 50 300 96 85-125 3 20 <br /> Stu rogare 1 2-Dichloroethane-d4 2 73 250 109 60-135 <br /> Surrogate 4-Bromo)7uorobenzene 235 250 94 70-110 <br /> Suirogate Dibromofluoromethane 143 250 97 65-130 <br /> Surrogate Toluene-d8 246 250 98 70-120 <br /> Batch 6C16016- EPA 5030B PIT/EPA 8260B <br /> Blank(6C16016-BLK1) Prepared&Analyzed 03/16/06 <br /> Chlorobenzene ND 0 50 ugll <br /> l 2 Dichlorobenzene ND 0 50 " <br /> 1 3 Dichlorobenzene ND 0 50 " <br /> 1 4 Dichlorobenzene <br /> ND 0 50 " <br /> Surrogate 1 2-Dichloroethane-d4 578 5 00 116 60-135 <br /> Surrogate 4-Bromofluorobenzene 418 5 00 84 70-120 <br /> Surrogate Dibromofluoramethane 602 5 00 120 65-130 <br /> .Sim ogaie Toluene-d8 4 85 5 00 97 70-120 1 <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 /> 0 <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 20 <br />