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QUALITY CONTROL REPORT <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Method 8020 <br /> LP# 6799 <br /> Analyst TB Spike Sample ID LCS/LCSD-W57 <br /> Date Of Analysis 11/20/92 Spike ID Code W-1-577 <br /> Column DB624 Surrogate ID Code W-1-619 <br /> Instrument # 10 Matrix Water Units <br /> (a) (b) (e) (d) (e) (0 (g) <br /> SAMPLE <br /> SAMPLE DUP ACCEPTANCE <br /> + + SPIKE LIMITS <br /> EPA SAMPLE SPIKE SPIKE SPIKE SPIKE DUP <br /> METHOD COMPOUNDS CONC CONC CONC REC%n CONC REC %n RPD% %REC RPD <br /> 8020 Chlorobenzene 0 40 46 1 115 43 108 7 1 SO- 120 <20 <br /> 8020 Benzene 1 0 40 45 112 43 108 4 90-120 <20 <br /> 8020 Ethyl Benzene 0 40 41 102 40 100 2 80-120 <20 <br /> Spike Recovery — d — ((c-a)/b) x 100 <br /> Spike Duplicate Recovery — f — ((e-a)/b) x 100 <br /> Relative Percent Difference = g = ( (c-el )/((c+e) x 5) x 100 <br /> (h) G) (I) (h) (1) <br /> SAMPLE <br /> SAMPLE DUP ACCEPTANCE <br /> SUR + + SUR DUP LIMITS <br /> EPA SURROGATE SPIKE SUR SPIKE SUR REC SUR SPIKE RECOVERY <br /> METHOD COMPOUNDS DST CONC CONC % CONC % % REC <br /> 8020 Bromotluorobenzene PID 80 1 83 1 104 1 73 91 80- 120 <br /> Surrogate % Recovery = j _ (i/h) x 100 <br /> Surrogate Dup % Recovery = 1 = (k/h) x 100 <br /> T <br /> �clren sm <br /> a <br /> ENVIRONMENTAL ENGINEERING CORPORATION (DC5-CN6799) <br /> KKlyMd Peper <br />