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QUALITY CONTROL REPORT <br /> Laborato Control Sample/Laboratory Control Sample Duplicate <br /> Method 820 <br /> Medium Level LP# 7639A <br /> Analyst TL Batch # 930601-0901 <br /> Date Of Analysis 06Z01/93 Spike Sample ID LCS/LCSD_S-67 <br /> Column DBWax Spike ID Code W-1-706 <br /> Instrument # 6 Surrogate ID Code W-1-681 <br /> Matrix Soil Units mg/Ka <br /> (a) (b) (e) (d) (e) (S) <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% % RECJ<2 <br /> 8020 Chlorobenzene 0 00.500 00478 96 00462 92 3 75- 125 <br /> 8020 Benzene 0 00500 00478 96 00460 92 4 7S-125Ethyl Benzene 0 0 0500 0 0480 96 0 0470 94 275-125 <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-e{ )/((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 DET CONC CONC REC % CONC % %aREC <br /> 8020 o-Chlorotoluene PID 1 200 173 86 <br /> 164 82 56- 131 <br /> Surrogate % Recovery = j _ (i/h) x 100 <br /> Surrogate Dup % Recovery = 1 = (k/h) x 100 <br /> � <br /> MBT Environmental rC <br /> Laboratories <br />