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QUALITY CONTROL REPORT <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Metals LP# 6743 <br /> Analyst BM Instrument # ICP#1 <br /> Date of Analysis 11/18/92 Spike Sample ID LCSS LCSDS <br /> Date of Digestion 11/16/92 Spike ID Code W4-3303 W4-1467 <br />' Batch # 921116-1103 Matrix Soil Units —mg/K&_ <br /> (a) (b) (c) (d) (e) (0 (g) <br />' SAMPLE <br /> SAMPLE DUP ACCEPTANCE <br /> + + SPIKE LIMI'T'S <br /> SAMPLE SPIKE SPIKE SPIKE SPIKE DUP RPD <br /> METALS CONC CONC CONC REC% CONC REC% % REC% RPD <br /> Pb 0 25 220 1 88 244 98 1 10 75 -125 J X20 <br /> Spike Recovery — d — ((c-a x 100 <br /> Spike Duplicate Recovery e f — ( (e-a)/b) x 100 <br /> Relative Percent Difference = g — ( Ic-eJ )/( (c+e) x 5) x 100 <br /> 1 <br /> caren sm <br /> H- rt <br />' ENVIRONMENTAL ENGINEERING CORPORATION W MCK*apeas. <br />