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t~_ aceAnalytical <br />mvw.pacelabs.corn <br />1 <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 Qualifiers <br />tent-Butylbenzene ug/L 50 46.8 94 73-125 <br />Tetrachloroethene ug/L 50 48.0 96 75-125 <br />Tetrahydrofuran ug/L 500 417 83 75-128 <br />Toluene ug/L 50 47.0 94 75-125 <br />trans-1,2-Dichloroethene ug/L 50 48.7 97 75-125 <br />trans-1,3-Dichloropropene ug/L 50 49.0 98 75-125 <br />Trichloroethene ug/L 50 48.3 97 75-125 <br />Trichlorofluoromethane ug/L 50 45.0 90 64-139 <br />Vinyl chloride ug/L 50 44.8 90 75-150 <br />Xylene (Total) ug/L 150 143 95 75-125 <br />1,2-Dichloroethane-d4 (S) % 100 75-125 <br />4-Bromofluorobenzene (S) % 100 75-125 <br />Dibromofluoromethane (S) % 102 75-125 <br />Toluene-d8 (S) % 99 75-125 <br />MATRIX SPIKE SAMPLE: <br /> <br />Parameter 1200783 <br /> <br />Units <br />10192262003 <br />Result <br />Spike <br />Conc. <br />MS <br />Result <br />MS <br />%Rec <br />%Rec <br />Limits Qualifiers <br />1,1,1,2-Tetrachloroethane ug/L ND 50 50.1 100 75-125 <br />1,1,1-Trichloroethane ug/L ND 50 55.5 111 75-145 <br />1,1,2,2-Tetrachloroethane uglL ND 50 48.5 97 75-125 <br />1,1,2-Trichloroethane ug/L ND 50 49.4 99 75-125 <br />1,1,2-Trichlorotrifluoroethane ug/L ND 50 67.1 134 75-150 <br />1,1-Dichloroethane ug/L ND 50 53.6 107 75-139 <br />1,1-Dichloroethene ug/L ND 50 58.2 116 75-148 <br />1,1-Dichloropropene ug/L ND 50 56.7 113 75-148 <br />1,2,3-Trichlorobenzene ug/L ND 50 47.7 95 75-127 <br />1,2,3-Trichloropropane ug/L ND 50 49.0 98 75-125 <br />1,2,4-Trichlorobenzene ug/L ND 50 50.8 102 75-126 <br />1,2,4-Trimethylbenzene ug/L ND 50 51.0 102 75-135 <br />1,2-Dibromo-3-chloropropane ug/L ND 50 47.3 95 75-125 <br />1,2-Dibromoethane (EDB) ug/L ND 50 49.5 99 75-125 <br />1,2-Dichlorobenzene ug/L ND 50 49.5 99 75-125 <br />1,2-Dichloroethane ug/L ND 50 52.3 105 75-139 <br />1,2-Dichloropropane ug/L ND 50 50.9 102 75-131 <br />1,3,5-Trimethylbenzene ug/L ND 50 52.0 104 75-134 <br />1,3-Dichlorobenzene ug/L ND 50 49.1 98 75-125 <br />1,3-Dichloropropane ug/L ND 50 49.8 100 75-127 <br />1,4-Dichlorobenzene ug/L ND 50 49.9 100 75-125 <br />2,2-Dichloropropane ug/L ND 50 56.4 113 75-150 <br />2-Butanone (MEK) ug/L ND 50 42.2 84 50-138 <br />2-Chlorotoluene ug/L ND 50 51.2 102 75-134 <br />4-Chlorotoluene ug/L ND 50 51.1 102 75-130 <br />4-Methyl-2-pentanone (MIBK) ug/L ND 50 47.1 94 75-125 <br />Acetone ug/L ND 125 134 107 30-142 <br />Allyl chloride ug/L ND 50 56.3 113 75-146 <br />Benzene ug/L ND 50 53.3 106 75-146 <br />Date: 05/21/2012 03:19 PM REPORT OF LABORATORY ANALYSIS Page 14 of 19 <br />This report shall not be reproduced, except in full, <br />without the written consent of Pace Analytical Services, Inc <br />14 of 21 <br />