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QUALITY CONTROL REPORT <br /> Laboratory Control Sample <br /> Method 8020 <br /> Medium Level <br /> LP: 9092 Batch #: 940422-0901 <br /> Date Of Analysis: 04/23/94 Spike Sample ID: LCSS 134 <br /> Column: DBWax Spike ID Code: W-1-905 <br /> Instrument #: 6 Surrogate ID Code: W-1-790 <br /> Matrix: Soil Units: ug/Kg <br /> (a) (b) (C) (d) (e) (f) (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 SO 224 90 NA NA NA 60- 128 <25 <br /> t8020 Benzene 0 250 236 94 NA NA NA 70- 124 <25 <br /> 8010 Ethyi Benzene 0 250 238 95 NA NA NA 1 67- 128 <S <br /> Spike Recovery = d = ((c-a)/b) x 100 <br /> Spike Duplicate Recovery = f = ((e-a)/b) x 100 <br /> Relative Percent Difference = g = ( Ic-el )/((c+e) x .5) x 100 <br /> (h) (i) u) (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 DET. CONC. CONC. REC % CONC. % %REC. <br /> 8020 o-Chlototoluene PID 200 168 84 1 NA NA 46-181 <br /> Surrogate % Recovery j = (i/h) x 100 <br /> Surrogate Dup % Recovery 1 — (k/h) x 100 <br /> MBT Environmental Pilaster Builders Te-chnotwes <br /> Laboratories <br />