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c Laboratories Inc. <br /> Environmental Testing Laboratory Since 1949 <br /> Herst Associates Reported: 06/0912010 7:31 <br /> 4630 South Highway 94 North Outer Road Project: NCYC <br /> Saint Charles MO 63304 Project Number: [none] <br /> Project Manager: Erin Fanning <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent Lab <br /> Constituent lype Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals <br /> tQC hatch ID: BTF0238 Used client sample: Y-Description: Indoor faucet DUP, 05/26/2010 09:32 <br /> 1,1-Dichloroethene MS 1007291-08 ND 26.790 25.000 ug/L 107 70-130 <br /> MSD 1007291-08 ND 28.500 25.000 ug/L 6.2 114 20 70-130 <br /> Toluene MS 1007291-08 ND 19.400 25.000 ug/L 77.6 70-130 <br /> MSD 1007291-08 ND 22.550 25.000 ug/L 15.0 90.2 20 70-130 <br /> __.....__......_.. <br /> Trichloroethene MS 1007291-08 0.95000 26.170 25.000 ug/L 101 70-130 <br /> ---- — ----- - MSD 1007291-08 0.95000 30.700 25.000 W V ug/L 16.5 --119 20 70-1.30 - - <br /> 1,2-Dichloroethane-d4(Surrogate) MS 1007291-08 ND 10.460 10.000 ug/L 105 76-114 <br /> MSD 1007291-08 ND 9.9600 10.000 ug/L 99.6 76-114 <br /> Toluene-d8(Surrogate) MS 1007291-08 ND 9.1200 10.000 ug/L 91.2 88-110 <br /> MSD 1007291-08 ND 9.2800 10.000 ug/L 92.8 88-110 <br /> ------ _ _..-.. ----- -- ---------- <br /> 4-Bromofluorobenzene(Surrogate) MS 1007291-08 ND 8.5600 10.000 ug/L 85.6 86-115 <br /> MSD 1007291-08 ND 8.6100 10.000 ug/L 86.1 86-115 <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 SC 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.bclabs.com Page 31 of 32 <br />