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_ aceAnalytical <br />! www.paCelabs.com <br />QUALITY CONTROL DATA <br />Project: 79019.00 ELK RIVER-OLD CITY DU <br />Pace Project No.: 10192537 <br />Pace Analytical Services, Inc. <br />1700 Elm Street -Suite 200 <br />Minneapolis, MN 55414 <br />(612)607-1700 <br />LABORATORY CONTROL SAMPLE: <br /> <br />Parameter 1199720 <br /> <br />Units <br />Spike <br />Conc. <br />LCS <br />Result <br />LCS <br />%Rec <br />%Rec <br />Limits <br />1,2,4-Trimethylbenzene ug/L 50 47.4 95 75-126 <br />1,2-Dibromo-3-chloropropane ug/L 50 43.9 88 75-125 <br />1,2-Dibromoethane (EDB) ug/L 50 47.9 96 75-125 <br />1,2-Dichlorobenzene ug/L 50 46.8 94 75-125 <br />1,2-Dichloroethane ug/L 50 48.4 97 75-132 <br />1,2-Dichloropropane ug/L 50 47.3 95 75-125 <br />1,3,5-Trimethylbenzene ug/L 50 48.2 96 75-126 <br />1,3-Dichlorobenzene ug/L 50 46.6 93 75-125 <br />1,3-Dichloropropane ug/L 50 48.1 96 75-125 <br />1,4-Dichlorobenzene ug/L 50 46.7 93 75-125 <br />2,2-Dichloropropane ug/L 50 49.7 99 72-133 <br />2-Butanone (MEK) ug/L 50 41.7 83 52-138 <br />2-Chlorotoluene ug/L 50 46.8 94 74-125 <br />4-Chlorotoluene ug/L 50 47.0 94 75-125 <br />4-Methyl-2-pentanone (MIBK) ug/L 50 46.4 93 75-125 <br />Acetone ug/L 125 129 103 30-150 <br />Allyl chloride ug/L 50 50.5 101 75-132 <br />Benzene ug/L 50 48.1 96 75-132 <br />Bromobenzene ug/L 50 46.5 93 75-125 <br />Bromochloromethane ug/L 50 50.7 101 75-126 <br />Bromodichloromethane ug/L 50 48.2 96 75-125 <br />Bromoform ug/L 50 48.9 98 75-125 <br />Bromomethane ug/L 50 48.0 96 52-150 <br />Carbon tetrachloride ug/L 50 50.4 101 73-132 <br />Chlorobenzene ug/L 50 48.0 96 75-125 <br />Chloroethane ug/L 50 45.5 91 75-143 <br />Chloroform ug/L 50 47.9 96 75-128 <br />Chloromethane ug/L 50 41.9 84 56-136 <br />cis-1,2-Dichloroethene ug/L 50 48.1 96 75-125 <br />cis-1,3-Dichloropropene ug/L 50 48.6 97 75-125 <br />Dibromochloromethane ug/L 50 48.7 97 75-125 <br />Dibromomethane ug/L 50 48.7 97 75-125 <br />Dichlorodifluoromethane ug/L 50 35.8 72 50-137 <br />Dichlorofluoromethane ug/L 50 48.0 96 68-133 <br />Diethyl ether (Ethyl ether) ug/L 50 49.9 100 75-125 <br />Ethylbenzene ug/L 50 48.8 98 75-125 <br />Hexachloro-1,3-butadiene ug/L 25 23.7 95 57-132 <br />Isopropylbenzene (Cumene) ug/L 50 48.3 97 75-125 <br />m&p-Xylene ug/L 100 96.3 96 75-125 <br />Methyl-tert-butyl ether ug/L 50 49.9 100 74-130 <br />Methylene Chloride ug/L 50 47.6 95 62-127 <br />n-Butylbenzene ug/L 50 48.1 96 68-128 <br />n-Propylbenzene ug/L 50 48.6 97 74-125 <br />Naphthalene ug/L 50 46.3 93 75-125 <br />o-Xylene ug/L 50 46.4 93 75-125 <br />p-Isopropyltoluene ug/L 50 47.6 95 75-125 <br />sec-Butylbenzene ug/L 50 47.9 96 71-125 <br />Styrene ug/L 50 48.4 97 75-125 <br />Date: 05/21/2012 03:19 PM REPORT OF LABORATORY ANALYSIS <br />This report shall not be reproduced, except in full, <br />without the written consent of Pace Analytical Services, Inc.. <br />Qualifiers <br />Page 13 of 19 <br />13 of 21 <br />