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iLc— <br /> Laboratories, Inc <br /> TRC Alton Geoscience Project 08671 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Manager Anju Farfan Reported 09/01/05 12 24 <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 Recove Lab Quals <br /> Benzene BOH1370 BOH1370-MS1 Matrix Spike ND 27 730 25 000 ug/L 111 70-130 <br /> BOH1370-MS01 Matrix Spike Duplicate NO 27 610 25 000 ug/L 0 905 110 20 70-130 <br /> Toluene BOH1370 BOH1370-MS1 Matrix Spike NO 26 750 25 000 ug/L 107 70-130 <br /> BOH1370-MSD1 Matrix Spike Duplicate NO 26 300 25 000 ug/L 189 105 20 70- 130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOH1370 BOH1370-MS1 Matrix Spike ND 10130 10 000 ug/L 101 76- 114 <br /> BOH1370-MSD1 Matrix Spike Duplicate ND 10 180 10 000 ug/L 102 76-114 <br /> Toluene-d8(Surrogate) BOH1370 BOH1370-MS1 Matrix Spike NO 10 220 10 000 ug/L 102 88-110 <br /> BOH1370-MSD1 Matrix Spike Duplicate NO 10 100 10 000 ug/L 101 88-.110 <br /> 4-Bromofluorobenzene(Surrogate) BOH1370 BOH1370-MS1 Matrix Spike NO 10 010 10 000 ug/L 100 86-115 T <br /> BOH1370-MSD1 Matrix Spike Duplicate NO 97300 10 000 ug/L 97 3 86-115 <br /> Benzene BOH1411 BOH1411-MS1 Matrix Spike NO 25 990 25 000 ug/L 104 70-130 <br /> BOH1411-MSD1 Matrix Spike Duplicate NO 25 870 25 000 ug/L 0 966 103 20 70-130 <br /> Toluene BOH1411 BOH1411-MS1 Matrix Spike NO 26 300 25 000 ug/L 105 70-130 <br /> BOH1411-MSD1 Matrix Spike Duplicate NO 26 270 25 000 ug/L 000 105 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOH1411 BOH1411-MS1 Matrix Spike NO 99000 10 000 ug/L 99 0 76-114 <br /> BOH1411-MSD1 Matrix Spike Duplicate NO 97500 10 000 ug/L 97 5 76-114 <br /> Toluene-dB(Surrogate) BOH1411 BOH1411-MS1 Matrix Spike ND 10 170 10 000 ug/L 102 88-110 <br /> BOH1411-MSD1 Matrix Spike Duplicate NO 10120 10 000 ug/L 101 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BOH1411 BOH1411-MS1 Matrix Spike NO 10 070 10 000 ug/L 101 86-115 <br /> BOH1411-MSD1 Matrix Spike Duplicate ND 97700 10 000 ug/L 977 86-115 <br /> BC Labora The results in Mrs report apply to the samplesed in accordance with the chain of custody document This analytical report must be re�ced in its entirety <br /> All results listed in this report are for the exclusive use of the submitting party BC LAborator assumes no responsibility for report alteration separation detachment or third party tnterpretauon r <br /> 4100 Atlas Court•Bakersfield,CA 93308•(661)327-4911 • FAX(661)327-1918•www bdabs corn Page 13 of 17 <br />