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11� <br /> BC Laboratories, Inc <br /> TRC Alton Geoscience Project 6981 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Managei Anju Parfan Reported 07/08/05 10 51 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Spike Percent Percent <br /> Constituent Batch ID QC Sample ID QC Sample Type Result Result Added Units RPD Recovery RPD Recovery Lab Quals <br /> Benzene D000008 BOG0008-MS1 Matrix Spike ND 21 070 25 000 ug/L 84 3 70-130 <br /> BOG0006-MSD1 Matrix Spike Duplicate ND 19 870 25 000 uglL 586 795 20 70-130 <br /> Toluene BOG0008 BOG0008-MS1 Matrix Spike ND 22 990 25 000 ug/L 92 0 70- 130 <br /> BOG0008401 Matrix Spike Duplicate ND 21 130 25 000 uglL 850 84 5 20 70- 130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOG0008 BOG0008-MS1 Matrix Spike ND 10 600 10 000 uglL 106 76-114 <br /> BOG0008-MSD1 Matrix Spike Duplicate NO 10 650 10 000 ug/L 106 76-114 <br /> Toluene-d8(Surrogate) BOG0008 BOG0008-MS1 Matrix Spike ND 98100 10 000 ug/L 981 88-110 <br /> BOG0008-MSD1 Matrix Spike Duplicate ND 10 040 10 000 ug/L 100 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BOG0008 BOG0008-MS1 Matrix Spike ND 10 170 10 000 ug/L 102 86-115 <br /> BOG0008-MSD1 Matrix Spike Duplicate ND 99500 10 000 ug/L 995 86-115 <br /> Benzene BOG0077 8000077-MS1 Matrix Spike 014000 21 570 25 000 ug/L 857 70-130 <br /> BOG0077-MSD1 Matrix Spike Dupltcate 014000 22 630 25 000 ug/L 4 89 Boo 20 70-130 <br /> Toluene BOG0077 BOG0077-MSI Matrix Spike ND 21 200 25 000 ug/L 848 70-130 <br /> BOG0077-MSD1 Matrix Spike Duplicate ND 22 620 25 000 ug/L 6 50 905 20 70-130 <br /> 1 2-Dichloroethane-d4(Surrogate) BOG0077 BOG0077-MSI Matrix Spike ND 10 140 10 000 ug/L 101 76-114 <br /> BOG0077-MSD1 Matrix Spike Duplicate ND 97800 10 000 ug/L 978 76-114 <br /> Toluene-d8(Surrogate) BOG0077 BOG0077-MSI Matrix Spike ND 99400 10 000 ug/L 99 4 88-110 <br /> BOG0077-MSDI Matrix Spike Duplicate ND 98500 10 000 ug/L 985 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BOG0077 BOG0077-MSI Matrix Spike ND 10 090 10 000 ug/L 101 86-115 <br /> BOG0077-MSD1 Matrix Spike Duplicate ND 10 160 10 000 ug/L 102 86-115 <br /> I <br /> i <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance it ith the charm of cuslody document This analylical report must be reprod ced in its entirety, <br /> • All results listed in this rciwrt arc for tate exclusive use of the submitting pan} BC Laboratories 1�mes no responsibthry for report alteration sytaranon detachment or third party interpretam <br /> 4100 Atlas Court• Baheisfreld, CA 93308 - (661)X1-491 1 • FAX(661)327-1918 •www bclabs corn Page 39 of 46 <br />