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QUALITY CONTROL REPORT <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Metals LP# 6755 <br /> Analyst BM Instrument # ICP#1 <br /> Date of Analysis 11Z19/92 Spike Sample ID LCSS LCSDS <br /> Date of Digestion _11/17/92 Spike ID Code W4-3303 4-1465 <br /> Batch # 921117-1111 Matrix Soil Units .mg/K.y- <br /> (a) (b) (C) (d) (9) <br /> SAMPLE <br /> SAMPLE DUP ACCEPTANCE <br /> + + SPIKE L1M171'5 <br /> SAMPLE SPIKE SPIKE SPIKE SPIKE DUP RPD <br /> METALS CONC CONC CONC REC% CONC REC% % REC% RPD <br /> Pb 0 25 230 92 7,43 97 5 75-125 <20 <br /> pike Recovery c-a x <br /> Spike Duplicate Recovery — f — ((e-a)/b) x 100 <br /> Relative Percent Difference — g — ( Ic-el )/((c+e) x 5) x 100 <br /> APatLar�n Sm <br /> t <br /> ENVIRONMENTAL ENGINEERING CORPORATION pepw <br />