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Laboratories Inc. i <br /> a� Environmental Testing Laboratory Since 1949 <br /> Herst Associates Reported: 06/23/2010 12:34 <br /> 4630 South Highway 94 North Outer Road Project. Austin Road/NCYCC Drilling <br /> Saint Charles, MO 63304 __ ._ . ....-.. __ _...____._.._--_____.. _-. Project Number. [none] <br /> Project Manager: Erin Fanning <br /> Volatile Organic Analysis (EPA Method6260) <br /> Quality Control Report - precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent Lab <br /> Constituent lypg Sample ID Result Result Added Unks RPD Recoveg RPD Recove duals <br /> QC Batch ID: BTF1398 Used client sample: Y-Description: Equip Blank, 06/14/2010 08:45 <br /> Benzene IVIS 1008252-01 NO 26.990 25.000 ugiL 108 70-130 <br /> MSD 1008252-01 NO 26.870 25.000 ug/L 0.4 107 20 70-130 <br /> Bromodichloromethane MS 1008252-01 NO 26.720 25.000 ug/L 107 70-130 <br /> MSD 1008252-01 NO 27.300 25.000 ug/L 2.1 109 20 70-130 <br /> Chlorobenzene MS 1008252-01 NO 23.570 25.000 _..- ug/L - -94.3 - 70-130 <br /> MSD 1008252-01 NO 23.320 25.000 ug/L 1.1 93.3 20 70-130 <br /> Chloroethane MS 1008252-01 NO 26.910 .__ 25.000 ug/L � - 108 70-130 <br /> MSD 1008252-01 NO 26.480 25.000 ugA. 1.6 106 20 70-130 <br /> 1,4-Dichlorobenzene-- MS 1008252-01_.-_NO 23.970 - 25.000 ug/L -1,.,7"--94.2 <br /> ... 95.9 70-130 <br /> MSD 1008252-01 ND 23.560 25.000 ug/L 1.7 94.2 20 70-130 <br /> 1,1-Dichloroethane MS 1008252-01 NO 27.390 25.000 ug/L 110 70-130 <br /> MSD 1008252-01 NO 27.630 25.000 ug/L 0.9 111 20 70-130 <br /> 1,1-DIIchloroethene MS 1008252-01 NO 30.870 25.000 ug/L 123 70-130 <br /> MSD 1008252-01 NO 31.000 25.000 ug/L 0.4 124 20 70-130 <br /> Toluene MS 1008252-01 NO 25.920 25.000 ug/L 104 70-130 <br /> MSD 1008252-01 NO 26.120 25.000 ug/L 0.8 104 20 70-130 <br /> - -........ <br /> --- <br /> Trichloroethene MS 1008252-01 NO 26.520 25.000 ug/L 106 70-130 <br /> MSD 1008252-01 NO 26.240 25.000 ug/L 1.1 105 20 70-130 <br /> 1,2-Dlchtoroethane-d4(Surrogate) MS 1008252-01 NO 10.300 10.000 ug/L 'TT 103 76-114 <br /> MSD 1008252-01 NO 10.650 10.000 ug/L 106 76-114 <br /> Toluene-d8(Surrogate) - �MS 1008252-01 - ND 10.200 10.000 ug/L 102 88-110 <br /> MSD 1008252-01 NO 10.310 10.000 ug/L 103 88-110 <br /> 4-Bromoftuorobenzene(Surrogate) IVIS� 1008252-01 NO 9.6300 10.000 - ug/L -- 96.3 86-115 <br /> MSD 1008252-01 NO 9.5600 10.000 ug/L 95.6 16-115 <br /> The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. <br /> All results listed in this report are for the exclusive use of the submitting party BC Laboratories,Inc,assumes no responsibility for report alteration separation,detachment or third party interpretation <br /> 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.bdabs.com Page 35 of 36 <br />