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�� a d OPa pa <br /> July 3 , 1997 <br /> Sample Log 16978 <br /> QC Report for EPA 602 & Modified EPA 8015 <br /> Run Log : 4163R <br /> From : Granite Construction (Prof . # 2088 .08) <br /> Sample(s) Received : 06/20/97 <br /> Matrix Spike <br /> Matrix Spike Duplicate <br /> Parameter Recovery $ Recovery RPD <br /> Benzene 104 97 7 <br /> Ethylbenzene 102 96 6 <br /> TPH as Gasoline 111 .110 1 <br /> * RPD = Relative Percent Difference <br /> Parameter Laboratory Control Sample <br /> Recovery <br /> Benzene 102 <br /> Ethylbenzene 100 <br /> Gasoline 108 <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 /> !Stewart Podolaky <br /> senior Choolat <br />