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* SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> METHOD 8020 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> PHONE(713)660-0901 <br /> Matrix: Aqueous Batch Id: HP W990110110300 <br /> Units: ug/L . <br /> L A B O R A T 0 R Y C 0 N T R 0 L S A M P L E <br /> S P I K E Method Spike Blank S ike QC Limits(•*) <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> t W Recovery Range <br /> MTBE NO 50 50 100 72 - 128 <br /> Benzene ND 50 47 94.0 61 - 119 <br /> Toluene ND 50 47 94.0 65 - 125 <br /> EthylBenzene ND 50 47 94.0 70 - 118 <br /> 0 Xylene NO 50 46 92.0 72 - 117 <br /> M & P Xylene NO 100 94 94.0 72 - 116 <br /> M A T R I X S P I K E S <br /> S P I K E Sample Spike Matrix Spike Matrix Spike MS/MSD QC Limits(***) <br /> C O M P O U N D S Results Added Duplicate Relative 4 _ (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5a Max- Recovery Range <br /> MTBE 3.9 20 26 110 26 . 110 0 20 39 - 150 <br /> BENZENE ND 20 26 130 26 130 0 21 32 - 164 <br /> TOLUENE ND 20 25 125 25 125 0 20 38 - 159 <br /> =ta ETHYLEENZENE NO 20 26 130 26 130 0 19 52 - 142 <br /> 0 XYLENE ND 20 26 130 25 125 3.92 18 53 - 143 <br /> M & P XYLENE ND 40 52 130 51 128 1.55 17 53 - 144 <br /> * Values outside QC Range due to Matrix Interference (except APD) <br /> Analyst: GS/ 4 = Data outside Method Specification limits. <br /> Sequence Date: 01/10/99 NC = Not Calculated (Sample exceeds spike by factor of 4 or morel <br /> SPL ID of sample spiked: 9901067-01A ND = Not Detected/Below Detection Limit <br /> Sample File ID: W_A1123-TXO k Recovery = [( <1> - <2> ) / <3> ] x 100 <br /> Method Blank File ID: LCS % Recovery. = (<I> / <3> ) x 100 <br /> Blank Spike File ID: W A1116.TX4 Relative Percent Difference = E (<4> - <5> 1 / [(<4> + <5> x 0.5] x 100 <br /> Matrix Spike File ID. W_A2007.TX0 (**) Source: SPL-Houston Historical Data (1st Q 197) <br /> Matrix Spike Duplicate File ID: W_A2008.TX0 (***) = Source: SPL-Houston Historical Data (Sat Q 197) <br /> SAMPLES TN BATCH(SPL ID)-. 9901068-01-A 9901066-02A 9901061-04A 9901059-06A <br /> 9901067-OIA 9901067-02A 9901059-03A <br /> .r <br />