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BC Laboratories, Inc i T <br /> TRC Alton Geosclence Project 5886 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Manager Anju Farfan Reported 08/30/05 05 5! <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 Recove RPD Recovery Lab Quals <br /> Gasoline Range Organics(C4-C12) BOH1356 BOH1356-MS1 Matrix Spike ND 11273 10000 uglL 113 70-130 <br /> BOH1356-MSD1 Matrix Spike Duplicate ND 11416 10000 uglL 088 1 114 20 70-130 <br /> a a a Tritluorotoluene(FID Surrogate) BOH1356 BOH1356-MSI Matrix Spike ND 13477 12000 ug/L 112 70- 130 <br /> BOH1356-MSD1 Matrix Spike Duplicate ND 13094 12000 uglL 109 70- 130 <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document This analylical report must he reproduced in its entirety <br /> All results listed to this reparr are For the exclusive use of the submitting parry $C Laboratories Inc assumes no responsibility for report alteration separation detachment or third party interpretation <br /> 4100 Atlas Court•Bakersfield,CA 93308•(661)327-4911 •FAX(661)327-1918•www bclabs corn Page 46 of 51 <br />