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ACCULASS. INC <br /> February 13 , 2002 <br /> Sample Log 23431 <br /> QC Report for EPA 8020 & Modified EPA 8015 <br /> Run Log : 4203Z <br /> From : STHL/Manteca #19976 (Prof . # 779956. 63040000) <br /> Sample(s) Received : 02/04/02 <br /> ' Matrix Spike <br /> Matrix Spike Duplicate <br /> Parameter % Recovery % Recovery RPD <br /> Benzene 62 66 6 <br /> Ethylbenzene 83 79 5 <br /> ' TPH as Gasoline 92 90 2 <br /> * RPD = Relative Percent Difference <br /> Laboratory 1 Sample <br /> Parameter ra ory Contro <br /> Recovery <br /> Benzene 62 <br /> Ethylbenzene 75 <br /> Gasoline 120 <br /> ' Parameter Method Blank <br /> Benzene <0 . 50 ug/L <br /> Toluene <0. 50 ug/L <br /> Ethylbenzene <0.50 ug/L <br /> ' Total Xylenes <0.50 ug/L <br /> TPH as Gasoline <50 ug/L <br /> 1 <br /> ' Tow Kw� <br /> Lab Dire o <br />