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ASSOCIATED LABORATORIES <br /> QA REPORT FORM <br /> QC Sample LR 72565-502 <br /> Matrix WATER <br /> Prep Date 05/16/01 <br /> Analysis Date 05/16/01 -05/17/01 <br /> LAB ID#'s in Batch LR 72650,72718,72621,72721 <br /> MATRIX SPIKE/MATRIX SPIKE DUPLICATE RESULT <br /> REPORTING UNITS= up,/L <br /> Sample Spike Matrix Matrix %Rec %Rec <br /> Test 7Method Result Added Spike Spk Dup MS MSD RPD <br /> Benzene 8021 ND 100 =127 124 127 124 2 <br /> Toluene 8021 ND 100 108 106 108 106 2 <br /> Ethylbenzene 8021 ND 100 116 112 116 112 4 <br /> • Xylenes 8021 ND 200 213 205 J 107 103 1 4 <br /> ND=Not Detected <br /> RPD=Relative Percent Difference of Matrix Spike and Matrix Spike Dup %REC LIMITS = 70-130 <br /> %aREC-MS&MSD=Percent Recovery of Matrix Spike&Matrix Spike Duplicate JRPD LIMITS = 30 <br /> PREPARATION BLANK 1 LAB CONTROL SAMPLE RESULTS <br /> PREP BILK LCS <br /> Test Method Value Result True %Rec L Limit H Limit <br /> Benzene 8021 ND 118 10 0 118 80% 120% <br /> Toluene 8021 ND 101 too 101 80% 120% <br /> Ethylbenzene 8021 ND 108 10 0 108 80% 120% <br /> Xylenes 8021 1 ND 200 200 100 1 80% 120% <br /> LCS =Lab Control Sample Result <br /> TRUE=True Value of LCS <br /> LLJMIT/H LIMIT=LCS Control Limits <br /> 5124101 8021_btex_0516w <br />