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• October 1, 1997 <br /> Sample Log 17374 <br /> QC Report for EPA 8020 & Modified EPA 8015 <br /> Run Log : 4165X <br /> From : Barbra Drake (Prod . # 02070512. 031508) <br /> Sample(s) Received : 09/19/97 <br /> Matrix Spike <br /> Matrix Spike Duplicate <br /> Parameter Recovery o Recovery RPD <br /> Benzene 103 103 0 <br /> Ethylbenzene 102 106 4 <br /> TPH as Gasoline 107 111 4 <br /> * RPD = Relative Percent Difference <br /> Parameter Laboratory Control Sample <br /> Recovery <br /> Benzene 101 <br /> Ethylbenzene 99 <br /> Gasoline 104 <br /> Parameter Method Blank <br /> TPH as Gasoline <br /> <1 _0 mg/Kg <br /> Stpmart Podolsky <br /> Senior Chemist <br />