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QUALITY CONTROL REPORT <br /> J <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Metals LP# 6743 <br /> Analyst BM Instrument # ICP#1 <br /> Date of Analysis 11Z18/92 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/Kg <br /> (a) (b) (C) (d) (S) <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°lo RPD <br /> Pb 0 25 220 88 244 98 10 75- 125 C_20 <br /> Spike Recovery -- d - c-a x <br /> IOU— <br /> Spike Duplicate Recovery - f - ( (e-a)/b) x 100 <br /> Relative Percent Difference a g - ( Ic-el )/( (c+e) x 5) x 100 <br /> Mqffiren sm <br /> afE <br /> ENVIRONMENTAL ENGINEERING CORPORATION � <br />