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* SPL BATCH QUALITY CONTROL REPORT •* HOUSTON LABORATORY <br /> METHOD 8020 8880 INTERCHANGE DRIVE <br /> O HOUSTON,TEXAS 77054 <br /> PHONE(713)660.0901 <br /> Matrix: Aqueous Batch Id: VARE990127D72500 <br /> Units: ug/L <br /> L A B 0 R A T 0 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> % I Recovery Range <br /> MTBE NO 50 48 96.0 72 - 128 <br /> Benzene ND 50 48 96.0 61 - 119 <br /> Toluene ND 50 48 96.0 65 - 125 <br /> EthylSenzene ND 50 49 98.D 70 - 118 <br /> 0 Xylene ND 50 48 96.0 72 - 117 <br /> M & P Xylene ND 100 97 97.0 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 0 M P 0 U N D S Results Added Dunlicate Relative V (Advisory)_ .___. <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> c4> <1> c5> Max, Recovery Range <br /> MTBE 280 20 280 NC 310 NC NC 20 39 - 150 <br /> BENZENE ND 20 21 105 21 105 0 21 32 - 164 <br /> TOLUENE ND 20 22 110 21 105 4.65 20 38 - 159 <br /> ETHYLBENZENE ND 2D 23 115 22 110 4.44 19 52 - 142 <br /> 0 XYLENE ND 20 23 115 22 110 4.44 19 53 - 143 <br /> M & P XYLENE ND 40 45 112 44 110 1.80 17 53 - 144 <br /> * Values outside QC Range due to Matrix Interference {except RPD) <br /> Analyst: LS r = Data outside Method Specification limits. <br /> Sequence Date: 01/27/99 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9901A27-05A ND = Not Detected/Below Detection Limit <br /> Sample File ID: £ A4110=0 k Recovery - [( <1> - <2> ) / <3> ] x 100 <br /> Method Blank File ID: LCS % Recovery = (<1> / <3> ) x 100 <br /> Blank Spike File TD: E_A4103.TX0 Relative Percent Difference = I (<4> - c5> / ((<4> + <5> ) x 0.5] x 100 <br /> Matrix Spike File ID: E_A4105.TXD (**) Source: SPL-Houston Historical Data (1st Q 197) <br /> Matrix Spike Duplicate File ID: E A4106.TXO (***) = Source: SPL-Houston Historical Data (1st Q -97) <br /> SAMPLES IN BATCH(SPL ID) : 9901A27-04A 9901A27-06A 9901A31-03A 9901A27-DIA <br /> 9901A26-03A 9901A23-08A 99D1A23-i0A 9901A23-OBA <br /> 9901A23-06A 9901A23-07A 9901962-02A 9901A26-02A <br /> 9901A19-02A 9901A27-05A 99OIA27-06A 9901A27-02A <br /> 9901A27-03A <br /> • <br />