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LABORATORIES, INC. <br /> Herst Associates Project: Misc. Samples Reported: 09/24/2007 8:37 <br /> 4630 South Highway 94 North Outer Road Project Number: NCYC <br /> Saint Charles, MO 63304 Project Manager: David Vasbinder <br /> Volatile Organic Analysis (EPA Method260) <br /> Quality Control Report - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent Batch ID QC Sample ID_ QC Type Result Level PQL Units Recovery RPD Recovery RPD Lab Qualls <br /> Benzene 8010811 BQ10811-BS1 LCS 23.590 25.000 0.50 ug/L 94.4 70-130 <br /> Bromodichloromethane BQ10811 BQ10811-BS1 LCS 26-610 25.000 0.50 ug/L 106 70-130 <br /> Chlorobenzene 8010811 BQ10811-BS1 LCS 24.080 25.000 0.50 ug/L 96.3 70-130 <br /> Chloroethane B010811 BQl0811-BS1 LCS 22.170 25.000 0.50 ug/L 88.7 70-130 <br /> _ -.- ..... ..... <br /> 1,4-Dichlorobenzene BQ10811 BQ10811-BS1 LCS 23.780 25.000 0.50 ug/L 95.1 70-130 <br /> 1,1-Dichloroethane BQ10811 BQt0811-BS1 LCS 23.270 25.000 0.50 ug/L 93.1 70-130 <br /> I,1-Dichloroethene BQ10811 BQ10811-BS1 LCS 25.710 25.000 0.50 ug/L 103 70- 130 <br /> Toluene BQ10811 6010811-BS1 LCS 24.960 25.000 0.50 ug/L 99.8 70-130 <br /> Trichloroethene BOI0811 BQ10811-BSI LCS 28.280 25.000 0.50 ug/L 113 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BQ10811 BQ10811-BS1 LCS 10.460 10.000 ug/L 105 76-114 <br /> Toluene-d8(Surrogate) BQ10811 BQ10811-BSI LCS 9.8700 10.000 ug/L 98.7 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BQ10811 B010811-BSI LCS 9.9200 10.000 ug/L 99,2 86-115 <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody docnntent. 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 reportaheration,separation; detachment or third parry interpretation. page 28 of 32 <br /> ® ® WO AJJiWurtiJWrsfi1JW 931"(661)327-4911®X(661327-1918 ww.bc_labs.com= <br />