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LABORATORY <br />QUALITY ASSURANCE REPORT <br />QC Batch #: <br />643 <br />Lab Project #: <br />9010601 <br />Sample <br />Result <br />ID <br />Compound <br />(mg/kg) <br />MB <br />TPH/Gas <br />ND <br />MB <br />MTBE <br />ND <br />MB <br />Benzene <br />ND <br />MB <br />Toluene <br />ND <br />MB <br />Ethyl Benzene <br />ND <br />MB <br />Xylenes <br />ND <br />Sample <br />Result <br />Spike <br />% <br />Sample # <br />ID <br />Compound <br />(mg/kg) <br />Level <br />Recv. <br />2835 <br />CMS <br />TPH/Gas <br />NS <br />CMS <br />Benzene <br />0.0161 <br />0.0191 <br />84.3 <br />CMS <br />Toluene <br />0.0166 <br />0.0191 <br />86.9 <br />CMS <br />Ethyl Benzene <br />0.0166 <br />0.0191 <br />86.9 <br />CMS <br />Xylenes <br />0.0476 <br />0.0574 <br />82.9 <br />Sample <br />Result <br />Spike <br />% <br />Sample # <br />ID <br />Compound <br />(mg/kg) <br />Level <br />Recv. <br />RPD <br />2835 <br />CMSD <br />TPH/Gas <br />NS <br />CMSD <br />Benzene <br />0.0163 <br />0.0191 <br />85.3 <br />1.2 <br />CMSD <br />Toluene <br />0.0173 <br />0.0191 <br />90.6 <br />4.1 <br />CMSD <br />Ethyl Benzene <br />0.0180 <br />0.0191 <br />94.2 <br />8.1 <br />CMSD <br />Xylenes <br />0.0512 <br />0.0574 <br />89.2 <br />7.3 <br />MB = Method Blank; 1 -CS = Laboratory Control Sample; CMS = Client Matrix Spike; CMSD = Client Matrix Spike Duplicate <br />NS = Not Spiked; OR = Over Calibration Range <br />Page 20 of 21 <br />CA Lab Accreditation #: 2118 /1-2303 <br />