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<br /> <br />88 Empire Drive <br />St Paul, MN 55103 <br />Tel: 651-642-1150 <br />Fax: 651-642-1239 <br /> <br />Liesch Associates, Inc. <br />13400 15th Avenue North, Suite A <br />Plymouth MN, 55441 <br /> <br />Project: Former Elk River Dump <br />Project Number: 79019.00 <br /> <br />Project Manager: Mr. Tom Johnson <br /> <br />Date Reported: <br />June 22, 2007 <br /> <br />VOC GCMS 82608 - Quality Control <br />Legend Technical Services, Inc. <br /> <br /> <br />Result <br /> <br />RL <br /> <br />MDL <br /> <br />Units <br /> <br />Spike <br />Level <br /> <br />Source <br />Result %REC <br /> <br />%REC <br />Limits <br /> <br />%RPD <br /> <br />%RPD <br />Limit <br /> <br />Notes <br /> <br />Batch B7F1313 . Volatiles <br />Blank (B7F1313-BLK1) Prepared & Analyzed: 06/13/07 <br />Chlorobenzene < 1.0 1.0 0.20 ug/L <br />Chloroethane < 2.5 2.5 0.35 ug/L <br />Chloroform < 1.0 1.0 0.15 ug/L <br />Chloromethane < 2.5 2.5 0.16 ug/L <br />cis-1,2-Dichloroethene < 1.0 1.0 0.29 ug/L <br />cis-1,3-Dichloropropene < 1.0 1,0 0.17 ug/L <br />Dibromochloromethane < 2.5 2.5 0.13 ug/L <br />Dibromomethane <2.5 2.5 0.43 ug/L <br />Dichlorodifiuoromethane < 5.0 5.0 0.20 ug/L <br />Dichlorofluoromethane < 1.0 1.0 0,18 ug/L <br />Ethyl ether < 5.0 5.0 0.34 ug/L <br />Ethylbenzene < 1,0 1.0 0.062 ug/L <br />Hexachiorobutadiene < 10 10 0.87 ug/L <br />isopropyl benzene < 1.0 1.0 0,12 ug/L <br />m,p-Xylene < 2.0 2.0 0.37 ug/L <br />Methyl isobutyl ketone < 5.0 5.0 1.4 ug/L <br />Methyl tert-butyl ether < 1.0 1,0 0,12 ug/L <br />Methylene chloride < 10 10 0.16 ug/L <br />Naphthalene < 5.0 5.0 0.37 ug/L <br />n-Butylbenzene < 2.5 2.5 0.21 ug/L <br />n-Propylbenzene < 1.0 1.0 0.12 ug/L <br />o-Xylene < 1.0 1.0 0.25 ug/L <br />p-Isopropyltoluene < 2.5 2,5 0.15 ug/L <br />see-Butyl benzene < 1.0 1.0 0,16 ug/L <br />Styrene < 1.0 1.0 0.18 ug/L <br />tert-Butylbenzene < 1.0 1.0 0.16 ug/L <br />T etrachloroethene < 1.0 1.0 0,15 ug/L <br />T etrahydrofuran <20 20 1.1 ug/L <br />Toluene < 1.0 1.0 0.23 ug/L <br />trans-1,2-Dichloroethene < 1,0 1.0 0.17 ug/L <br />trans-1,3-Dichloropropene < 1.0 1.0 0.26 ug/L <br />Trichloroethene < 1.0 1.0 0.28 ug/L <br />Trichlorofluoromethane < 1.0 1.0 0,12 ug/L <br />Vinyl chloride < 1.0 1.0 0.31 ug/L <br />Surrogate: 4-Bromofluorobenzene 60,9 ug/L 61.0 99.8 80-125 <br />Legend Technical Services, Inc. The results in this report apply to the samples analyzed in accordance with <br /> the chain of custody document. This analytical report must be reproduced <br /> in its entirety. <br /> Page 11 of 15 <br />