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* SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> METHOD 0020 6860 INTERCHANGE DRIVE <br /> HOUSTON. TEXAS 77054 <br /> PHONE(713)660.0901 <br /> Matrix: Aqueous Batch Id: VARE990329093600 <br /> f-'+ <br /> Units: ug/L <br /> L A B O R A T O R Y C 0 N T R 0 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> % W Recovery Range <br /> MTBE NU 50 50 100 72 - 128 <br /> Benzene ND 50 46 92.0 61 - 119 <br /> Toluene ND 50 43 86.0 65 - 125 <br /> EthylBenzene ND 50 46 92.0 70 - 118 <br /> O Xylene ND 50 44 88.0 72 - 117 <br /> M & P Xylene ND 100 88 88.0 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 !k (AdvisoLX) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE 104 20 110 NC 120 NC NC 20 39 - 150 <br /> BENZENE ND 20 19 95.0 2DI 100 5.13 21 32 - 164 <br /> TOLUENE ND 20 18 90.0 19 95.0 5.41 20 38 - 159 <br /> ETHYLBENZENE ND 20 19 95.0 1 20 100 5.13 19 52 - 142 <br /> O XYLENE ND 20 2D 100 20 100 0 18 53 - 143 <br /> M & P XYLENE ND 40 38 95.0 38 95.0 0 17 53 - 144 <br /> * = Values outside QC Range due to Matrix Interference (except RPD) <br /> Analyst- LJ a Data outside Method Specification limits. <br /> Sequence Date: 03/29/99 NC = Not Calculated (Sample exceeds spike by factor of 4 or morel <br /> SPL ID of sample spiked- 9903B99-01A ND = Not Detected/Below Detection Limit <br /> Sample File ID: E_C5012.TXO % Recovery - [( <I> - �2n ) / <3> ) x 100 <br /> Method Blank File ID: LCS % Recovery = (<1> / <3> ) x 100 <br /> Blank Spike File ID: E_C5905.TX0 Relative Percent Difference = I (<4> - <5> 1 / [(<4> + <5> J x 0,5] x 100 <br /> Matrix Spike File 1D, E C5407.TX4 (**) Source- SPL-Houston Historical Data 41st Q 197) <br /> Matrix Spike Duplicate File ID: E C5008.TX0 (***) = Source: SPL-Houston Historical Data (15t Q '97) <br /> SAMPLES IN BATCH(SPL ID) : 9903899-03A 9903899-04A 9903899-OSA 9903B99-06A <br /> 99031399-07A 9903699-OBA 99D3H99-09A 9903A56-01A <br /> 99D3A56-02A 9903A56-03A 9903A56-04A 9903A56-OSA <br /> 9903A56-06A 9903A56-07A 9903A56-DBA 9903999-OIA <br /> 9903699-02A 99031134-02A 9903634-D1A <br /> a <br />