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SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> Method 8020A*** 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> �f PHONE(710)660-0901 <br /> - Aqueous Batch Id: HPS980914122700 <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 Btank Spike QC Limits(**) <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> X X Recovery Range <br /> MTBE ND 50 42 84.0 72 128 <br /> Benzene ND 50 44 88.0 61 119 <br /> Toluene ND 50 45 90.0 65 - 125 <br /> EthylBenzene ND 50 42 84.0 70 - 118 <br /> 0 Xylene ND 50 44 88.0 72 117 <br /> M $ P Xylene ND 100 90 90.0 72 - 116 <br /> M A T R I X S P I K E S <br /> S P 1 K E Sample Spike Matrix Spike Matrix Spike MS/MSD OC Limits(***) <br /> C 0 M P 0 U N D S Results Added Duplicate Relative % (Advisory) _ <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE 210 20 220 NC 210 NC NC 20 39 150 <br /> BENZENE ND 20 29 145 15 75.0 63.6 * 21 32 - 164 <br /> TOLUENE ND 20 29 145 16 80.0 57.8 * 20 38 159 <br /> ETHYLBENZENE ND 20 30 150 * 15 75.0 66-7 * 19 52 142 <br /> 0 XYLENE ND 20 31 155 * 16 80.0 63.8 * 18 53 - 143 <br /> M 8 P XYLENE 1.03 40 59 145 * 32 77.4 60.8 * 17 53 - 144 <br /> * = Values outside OC Range due to Matrix Interference (except RPD) <br /> Anatyst: YN « = Data outside Method Specification limits. <br /> Sequence Date: 09/14/98 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9809326-01A ND = Not Detected/Below Detection Limit <br /> Sample File ID: S_12012.TXO % Recovery = [( <1> - <2> ) / <3> ) x 100 <br /> Method Blank File ID_ LCS % Recovery = (<l> / <3> 7 x 100 <br /> Blank Spike File ID: S_12005.TXO Relative Percent Difference = 1(<4> - <5> 1 / C(<4> + <5> ) x 0.51 x 100 <br /> Matrix Spike File ID: S_12008.TXO (**) = Source: SPL-Houston Historical Data (1ST O 197) <br /> Matrix Spike Duplicate File ID: S_12009.TXO (***) = Source: SPL-Houston Historical Data (1ST O 197) <br /> SAMPLES IN BATCH SPL ID): 9809326-05A 9809326-06A 9809326-07A 9809326-OBA <br /> 9809326-09A 9809326-10A 9809326-11A 9809326-12A <br /> 9809326-07A 9809326-08A 9809326-11A 9809386-01A <br /> 9809326-01A 9809326-02A 9809326-03A 9809326-04A <br />