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Ii <br /> BC Laboratories, Inc <br /> TRC Alton Geoscience Project 5886 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92619-2302 1 Project Manager Anju Farfan Reported 08/30/05 05 51 <br /> Volatile organic Analysis (EPA Method 8264) <br /> Quality', Control Report - Precision & Accuracy <br /> it Control Limits <br /> If Source Spike Percent Percent <br /> Constituent Batch ID QC Sample ID QC Sample T e Result Result Added Units RPD Recovery RPD Recovey Lab Quals <br /> Benzene BOH1341 BOH1341-MS1 Matrix Spike 1� ND 26 990 25 000 uglL 108 70-130 <br /> BOH1341-MSD1 Matrix Spike Duplicate ND 26 870 25 000 ug/L 0 930 107 20 70-130 <br /> Toluene BOH1341 BOH1341-MS1 Matrix Spike II ND 25 730 25 000 ug/L 103 70- 130 <br /> BOH1341-MSD1 Matrix Spike Duplicate ND 26 850 25 000 uglL 3 81 107 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOH1341 BOH1341-MS1 Matrix Spike I ND 10 190 10 000 ug/L 102 76-114 <br /> BOH1341-MSD1 Matrix Spike Duplicate ND 99700 10 000 uglL 997 76-114 <br /> Toluene-d8(Surrogate) BOH1341 BOH1341-MSI Matrix Spike li ND 10 120 10 000 uglL 101 88-110 <br /> BOH1341-MSD1 Matrix Spike Duplicate ND 10 110 10 000 uglL 101 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BOH1341 BOH1341-MS1 Matrix Spike !I ND 10 070 10 000 uglL 101 86-115 <br /> BOH1341-MSD1 Matrix Spike Duplicate ND 10 030 10 000 ug1L 100 86-115 <br /> i <br /> If ' <br /> .I <br /> BC Laboratories The results to this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its enlrrery <br /> All resulrs listed to this report are for the exclusive use of the submitting parry BC Laboratorn umes no responstbthry For report alteration separation detachment or third parry mtcrprcrauon <br /> 4100 Atlas Court•Bakersfield,CA 93308• (6 7L 4911 •FAX(661)327-1918•www bclabs tom 40 Page 45 of 51 <br />