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BC Laboratories, Inc <br /> B C LABORATORIES <br /> QUALITY CONTROL REPORT <br /> Method 8260 <br /> TRC ALTON GEOSCIENCE Date of Report 09/10/2004 <br /> 21 TECHNOLOGY DRIVE Sample Matrix Groundwater <br /> IRVINE CA 92618 2302 QC Batch ID 200409154 1*8260 <br /> ANJU FARFAN <br /> Samples Affected 04 09154 1 04 09154 19 <br /> Method j jSpike %Recj PrecisionjLCS % Rec jj <br /> Blank j j MS j MSD jSpike j LCS j Control j Control j Control <br /> jjConstituents Readings jUnits j% Rec J% Rec IR P D IX Rec j Limits j Limits j Limits <br /> jjBenzene _ < 0 5 1 vq/L 1 87 93 7 96 1 70 1301 201 70 13011 <br /> JjToluene < 0 5 j,ug/L 1100 X104 j 4 1105 j 70 1301 201 70 13011 <br /> MS = Matrix Spike MSD = Matrix Spike Duplicate RPD = Relative Percent Difference <br /> LCS x; Laboratory Control Sample <br /> Quality Control Officer <br /> V:n _ <br /> Danette Bohm <br /> All results listed,n this report are for the exclusive use of the submrnng parry SC Laboratories Inc assumes no responsibility For report alteration separmon detachmenr or third perry Interpretation <br /> 4100 Atlas Court• Bakersfield, CA 93308 • (661) 327-4911 • FAX(661) 327-1918 •wwwbdabs com <br />