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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. Project: Former Elk River Dump <br />13400 15th Avenue North, Suite A Project Number: 79019.00 Date Reported: <br />Plymouth MN, 55441 Project Manager: Mr. Tom Johnson June 22, 2007 <br /> VOC GCMS 82608 - Quality Control <br /> Legend Technical Services, Inc. <br /> Spike Source %REC %RPD <br />Analyte Result RL MDL Units Level Result %REC Limits %RPD Limit Notes <br />Batch B7F1313 - Volatiles <br />Matrix Spike (B7F1313-MS1) Source: 0702739-02 Prepared & Analyzed: 06/13/07 <br />n-B utyl benzene 49.2 2.5 0.21 ug/L 50.0 <2.5 98.4 75-125 <br />n-Propylbenzene 46,0 1.0 0.12 ug/L 50.0 <1.0 92.0 80-120 <br />Toluene 49.8 1.0 0,23 ug/L 50.0 <1.0 99,6 80-120 <br />T richloroethene 51,1 1.0 0.28 ug/L 50.0 <1.0 100 75-125 <br />Vi nyl chloride 51.6 1.0 0.31 ug/L 50.0 <1.0 103 75-125 <br />Surrogate: 4-Bromofluorobenzene 64.0 ug/L 61.0 105 80-125 <br />Surrogate: Dibromofluoromethane 63.7 ug/L 61.0 104 80-121 <br />Surrogate: Toluene-d8 63.1 ug/L 61.0 103 80-120 <br />Matrix Spike Dup (B7F1313-MSD1) Source: 0702739-02 Prepared & Analyzed: 06/13/07 <br />1,1.2,2- Tetrachloroethane 46.7 1.0 0.20 ug/L 50.0 <1.0 93.4 80-123 0.640 20 <br />1.1-Dichloroethane 49.5 1.0 0.11 ug/L 50.0 <1.0 99.0 80-120 0.202 20 <br />1.1-Dichloroethene 50.2 1.0 0.20 ug/L 50.0 <1.0 100 80-120 2,36 20 <br />1,3,5- Trimethylbenzene 46.4 1.0 0.19 ug/L 50.0 <1.0 92.8 80-120 0.858 20 <br />1.4-Dichlorobenzene 45.3 1.0 0.20 ug/L 50.0 <1.0 90.6 75-125 0.879 20 <br />2-Chlorotoluene 45.0 1.0 0.16 ug/L 50.0 <1.0 90.0 80-120 1,10 20 <br />Benzene 48.8 1.0 0.039 ug/L 50.0 <1.0 97.6 75-125 0.816 20 <br />Bromoform 49.2 5,0 0.68 ug/L 50.0 <5.0 98.4 80-125 6.30 20 <br />Chlorobenzene 46.6 1.0 0.20 ug/L 50.0 <1.0 93.2 80-120 2.54 20 <br />Chloroform 51.1 1.0 0.15 ug/L 50.0 <1.0 102 80-120 0.780 20 <br />Ethylbenzene 48,6 1.0 0.062 ug/L 50.0 <1.0 97.2 80-120 0.412 20 <br />n-Butylbenzene 49.1 2.5 0.21 ug/L 50.0 <2.5 98,2 75-125 0.203 20 <br />n-Propylbenzene 45.8 1.0 0,12 ug/L 50.0 <1.0. 91.6 80-120 0.436 20 <br />Toluene 49,7 1.0 0.23 ug/L 50.0 <1.0 99.4 80-120 0.201 20 <br />Trichloroethene 50.0 1.0 0,28 ug/L 50.0 <1.0 98.1 75-125 2,18 20 <br />Vinyl chloride 50.3 1.0 0,31 ug/L 50.0 <1.0 101 75-125 2.55 20 <br />Surrogate: 4-Bromofluorobenzene 62.7 ug/L 61.0 103 80-125 <br />Surrogate: Dibromofluoromethane 64.6 ug/L 61.0 106 80-121 <br />Surrogate: Toluene-d8 63.2 ug/L 61.0 104 80-120 <br /> <br />Legend Technical Services, Inc. <br /> <br />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 /> <br />Page 13 of 15 <br />