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BC' Laboratories, Inc <br /> TRC Alton Geoscrence Project 6981 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Manager Anju Farfan Reported 07/08/05 10 51 <br /> Purgeable Aromatics and Total Petroleum Hydrocarbons <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 /> Gasoline Range Organics(C4-C12) BOF1454 BOF1454-MS1 Matrix Spike ND 10198 10000 uglL 102 70-130 <br /> BOF1454-MSD1 Matrix Spike Duplicate ND 10287 10000 ug/L 0 976 103 20 70-130 <br /> a a a-Trifluorotoluene(FID Surrogate) BOF1454 BOF1454-MSI Matrix Spike ND 37 025 40 000 ug1L 926 70-130 <br /> BOF1454-MSD1 Matrix Spike Duplicate ND 35 340 40 000 ug1L 884 70-130 <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reduced in its entire <br /> ty <br /> Ali results hsted in ibis rcporr are for the exclusive use of rhe satbmnong parry BC Zaborarones En[ tssumes no iesponstbdtry far report ilrerattun separanun demdunent or third parry utrerpretanon <br /> 4100 Atlas Court- Bakersfield,CA 93308 - (661) 327-4911 -FAX(661)327-1918.www bclabs corn Page 40 of 46 <br />