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BC O' LaboratoriesInc <br /> I <br /> i <br /> TRC Alton Geoscience 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 - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent Batch ID QC Sample ID OC Type Result Level PQL Units Recovery RPD Recovery RPD Lab Quals <br /> Gasoline Range Organics(C4-C12) BOF1454 BOF1454-BS1 LCS 98910 10000 50 ug/L 989 85-115 <br /> a a a-Trrfluorotoluene(FID Surrogate) BOF1454 BOF1454-BS1 LCS 35 754 40 000 uglL 894 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 reproduced to its entirety <br /> All resuirs Itsred in this r port are For the eaclustvc use of the submitting party BC Iabonrones Inc assumes no responsibthty for report ilteranon sep irauon detaLhinent or third parry rnterprerauott <br /> 4100 Atlas Court- Bakersfield, CA 93308 • (661)327-491 1 • FAX(661) 327-1918-www bclabs corn Page 42 of 46 I <br />