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** SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> METHOD 8020 88801NTERCHANGE DRIVE <br /> HOUSTON, TEXAS 77054 <br /> Matrix: Aqueous Batch Id: VARE990721233200 PHONE(713)660-0901 <br /> Units_ ug/, <br /> L A B O R A T O R Y C O N T R O L S A M P L E <br /> S P I K E Method Spike Blank Spike QC Limits{**) <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> % Recovery Range <br /> MTBE ND 50 51 102 72 - 128 <br /> Benzene ND 50 47 1 94.0 61 - 119 <br /> Toluene ND 50 48 96.0 65 - 125 <br /> EthylBenzene ND 50 46 92.0 70 - 118 <br /> 0 Xylene ND 50 53 106 72 - 117 <br /> M & P Xylene ND 100 100 IOD 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 ! _ (Advisoryl <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <i> e5> Max. Recovery Range <br /> MTBE 83 20 100 NC 81 NC NC 20 39 - 150 <br /> BENZENE ND 20 19 95.0 14 70.0 30.3 * 21 32 - 164 <br /> TOLUENE ND 20 19 95.0 14 70.0 30.3 * 20 38 - 159 <br /> ETHYLBENZENE ND 20 18 90.0 12 6C.0 40.0 * I 19 52 - 142 <br /> 0 XYLENE ND 20 21 105 1S 75.4 33.3 * 18 53 - 143 <br /> M & P XYLENE ND 40 40 100 28 70.0 35.3 * 17 53 - 144 <br /> * Values outside QC Range due to Matrix Interference (except RPD) <br /> Analyst: DR « = Data outside Method Specification limits. <br /> Sequence Date: 07/22/99 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9907597-OIA ND Not Detected/Below Detection Limit <br /> Sample File ID: E_G3077A.TX0 V Recovery = [( <I> - <2> ) / <3> ] x 100 <br /> Method Blank File ID: LCS k Recovery = (<1> / <3> } x 100 <br /> Blank Spike File ID: £_G3068A.TX0 Relative Percent Difference * I (<4> - <5> f / [(<4> + <5> ) x 0.5] x 100 <br /> Matrix Spike File ID: E_G3C71A.TXO (**) Source: SPL-Houston Historical Data (lot Q 197) <br /> Matrix Spike Duplicate File ID: E_G3072A.TXO (***) Source: SPL-Houston Historical Data (1st Q 197) <br /> SAMPLES IN SATCH(SPL ID) : 9907524-33A 9907712-01A 9907712-03A 9907592-09A <br /> 9907597-02A 9907597-03A 9907743-OIA 9907743-02A <br /> 9907597-OIA 9907597-03A 9907597-02A 9907597-04A <br />