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QUALITY CONTROL REPORT <br /> Laboratory Control Sample/Laboratory Control Sample Duplicate <br /> Total Petroleum Hydrocarbons TPH - -Diesel <br /> LP# 7639A <br /> ' Analyst EB Batch # 930527-1902 <br /> Date Of Analysis 05/29Z93 Spike Sample ID LCSS/LCSDS #64 <br /> Column DB-1 Spike ID Code W2-1593 <br /> Instrument # PGC #4 Surrogate ID Code NA <br /> Matrix Soil Units mg/Kg <br /> (a) (b) (C) (d) e <br /> ( ) (0 (g) ACCEPTJ]D <br /> LIMI <br /> SAMPLE + SAMPLE SPIKE <br /> SAMPLE SPIKE SPIKE SPIKE DUP + DUP <br /> COMPOUNDS CONC CONC CONC REC % SPIKE CONC REC % RPD % RI-C <br /> Diesel 0 833 777 93 71 1 85 9 50- 121 <br /> Spike Recovery = d = ((c-a)/b) x 100 <br /> Spike Duplicate Recovery = f — ((e-a)/b) x 100 <br /> Relative Percent Difference — g = ( fc-el )/((c+e) x 5) x 100 <br /> ['1= Fri;MBT Environmental - -r - - <br /> Laboratories <br />