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QUALITY CONTROL REPORT <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Metals LP# 6799 <br /> Analyst SP Instrument # PE5100 <br /> Date of Analysis , 11130/92 Spike Sample ID LCSW/LCSDW -_ <br /> Date of Digestion 11/24/92 Spike ID Code W4-3020 <br /> Batch # 921124-1104 Matrix Water Units ug/L <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 0 200 1 217 1 108 1 231 115 1 b 1 80- 120 <20 <br /> Spike Recovery = c-a)/b) x <br /> Spike Duplicate Recovery = f = ((e-a)/b) x 100 <br /> Relative Percent Difference = g = ( {c-ej )/((c+e) x 5) x 100 <br /> Aren sm <br /> Pa <br /> ENVIRONMENTAL ENGINEERING CORPORATION (D C 5-CN6 7 9 9) W�hctia pewr <br />