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--kBC Laboratories, Inc <br /> TRC Alton Geoscience Project 11192 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Manager Anju Farfan Reported 09/12/05 14 16 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Method Blank Analysis <br /> Constituent Batch ID QC Sample ID MB Result Units PQL MDL Lab Quals <br /> Toluene-d8(Surrogate) B010046 BOM046-BLK1 947 % 88 110 (LCL-UCL) <br /> 4-Bromofluo ro benzene(Surrogate) B010046 B010046-BLK1 860 % 86 115 (LCL-UCL) T <br /> Benzene B010244 B010244-BLK1 ND uglL 10 012 <br /> 1,2-Dibromoethane B010244 8010244-BLKi ND uglL 050 0 11 �T <br /> 1,2-Dichloroethane B010244 B010244-BLK1 ND ug/L 050 025 <br /> Ethylbenzene B010244 B010244-BLK1 ND uglL 10 013 <br /> Methyl t-butyl ether B010244 8010244-BLK1 ND ug/L 2 0 0 15 <br /> Toluene B010244 8010244-BLK1 ND ug1L 10 015 <br /> Total Xylenes 8010244 B010244-BLK1 ND ug/L 1 0 040 <br /> Acetone 8010244 B010244-BLK1 ND ug/L 10 6 2 <br /> t-Amyl Methyl ether B010244 B010244-BLK1 ND ug1L 2 0 0 31 <br /> t Butyl alcohol 8010244 B010244-BLK1 ND ug1L 10 10 � <br /> Dusopropyi ether 6010244 8010244-BLK1 ND ug1L 2 0 025 <br /> Ethanol B010244 B010244-BLK1 ND ug1L 1000 110 <br /> Ethyl t butyl ether B010244 B010244-BLK1 ND ug/L 050 027 <br /> Total Purgeable Petroleum Hydrocarbons 8010244 8010244-BLK1 ND uglL 50 23 <br /> 1,2-Dichloroethane-d4(Surrogate) 8010244 8010244-BLK1 108 % 76 114 (LCL-UCL) <br /> Toluene-d8(Surrogate) B010244 B010244-BLK1 961 % 88- 110 (LCL-UCL) <br /> 4-Bromofluorobenzene(Surrogate) B010244 8010244-BLK1 909 % 86- 115 (LCL-UCL) <br /> BC Laboratories The results in this report apply to the samples analyzed to accordance with the chain of custody document This analytical report must he reproduced to its cnurcty <br /> ASI results 11Ste6 to chis report are for the exdastve use of the submitting parry BC Laboratort assumes no responsibility for report alteration separation detachment or third parry interpretation <br /> 0 <br /> • 4100 Atlas Court• Bakersfield,CA 93308 • (6 27-4911 •FAX(661) 327-1918•www bclabs com Page 21 of 22 <br />