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QUALITY CONTROL REPORT <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Method 8020 <br /> Medium Level LP# 6738 <br /> Analyst TL Batch # 921105-0901 <br /> Date Of Analysis 11/05/92 Spike Sample ID LCS LCSDS-33 <br /> Column DBWax Spike ID Code W-1-616 <br /> Instrument # 6 Surrogate ID Code W-1-493 <br /> Matrix Soil Units _ mg,/Kg <br /> (a) (b) (c) (d) (e) (t] (g) <br /> SAMPLE ACCEPTANCE <br /> SAMPLE DUP LIMITS <br /> + + SPIKE <br /> EPA SAMPLE SPIKE SPIKE SPIKE SPIKE DUP <br /> METHOD COMPOUNDS CONC CONC CONC REC% CONC REC % RPD% %REC RPD <br /> 8020 Chlorobenzene 0 0 050 0 042 84 0 040 80 5 75-125 J<25 <br /> 8020 Benzene 0 0050 0050 100 0047 94 6 75-125 8020 Ethyl Benzene 0 0050 0052 104 0048 96 8 75-125 <br /> Spike Recovery — d — ((c-a)/b) x 100 <br /> Spike Duplicate Recovery a f — ((e-a)/b) x 100 <br /> Relative Percent Difference = g — ( ic-el )/((c+e) x 5) x 100 <br /> (h) (k) (1) <br /> SAMPLE <br /> SAMPLE DUP ACCEPTANCE <br /> SUR_ + + SUR. SUR.DUP LIMITS <br /> EPA SURROGATE SPIKE SUR SPIKE SUR, SPIKE RECOVERY <br /> METHOD COMPOUNDS DEI' CONC CONC REC % CONC % %REC <br /> E_ <br /> 8020 o-Chlorotoluene PID 1 020 019 95 018 90 56- 131 <br /> Surrogate % Recovery = J = (i/h) x 100 <br /> Surrogate Dup % Recovery m 1 (k/h) x 100 <br /> A <br /> La- <br /> cr�nSM <br /> art <br />' ENVIRONMENTAL ENGINEERING CORPORATION 40��rn�,p„ <br />