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QUALITY CONTROL REPORT <br /> 1 <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Metals LP# 6738 <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 4-1467 <br /> Batch # 921116-1103 Matrix Soil Units m K <br /> (a) (b) (c) (d) (e} (f) (g) <br /> SAMPLE <br /> SAMPLE DUP ACCEPTANCE <br /> + + SPIKE LIMITS <br /> SAMPLE SPIKE SPIKE SPIKE SPIKE DUP RPD <br /> METALS CONC CONC CONC REC% CONC REC% % REC% RPD <br /> Pb 0 25 220 88 244 98 1 10 75- 125 <20 <br /> Spike Recovery — d — ((c-a x <br /> 100 <br /> Spike Duplicate Recovery — f e ((e-a)/b) x 100 <br /> Relative Percent Difference = g — ( Ic-el )/( (c+e) x 5) x 100 <br /> q aren SM <br /> art`�� <br /> ' ENVIRONMENTAL ENGINEERING CORPORATION nWWWd neper <br />