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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 1d: HP S980113221300 <br /> Units: Ag/L <br /> L A 6 0 R A T 0 R Y C 0 N T R 0 L S A M P L E <br /> S P 1 K E Method Spike _ Blank Spike QC Limits(**) <br /> C 0 M P 0 U H D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> % % Recovery Range <br /> MTBE ND 50 40 80.0 72 128 <br /> Benzene NO 50 44 88.0 61 119 <br /> Toluene ND 50 43 86.0 65 - 125 <br /> Ethy[Benzene ND 50 42 84.0 70 - 118 <br /> 0 Xylene ND 50 44 88.0 72 - 117 <br /> M & P Xylene ND 100 87 87.0 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 DMpticate Relative X _ (Advisory) <br /> Result Recovery Result Recovery Difference RPO <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE 12.7 20 28 76-5 30 86.5 12.3 20 39 - 150 <br /> BENZENE NO 20 20 100 20 100 0 21 32 - 164 <br /> TOLUENE NO 20 19 95.0 19 95.0 0 20 38 - 159 <br /> ETHYLBENZENE NO 20 18 90.0 18 90.0 0 19 52 - 142 <br /> 0 XYLENE NO 20 19 95.0 19 95.0 0 18 53 - 143 <br /> M & P XYLENE ND 40 38 95.0 37 92.5 2.67 17 53 - 144 <br /> * = Values outside QC Range due to Matrix Interference (except RPD) <br /> Analyst: UHZ « = Data outside Method Specification limits. <br /> Sequence Date: 01/13/98 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9801334-02A ND = Not Detected/Below Detection Limit <br /> Sample File ID: S_A2072.TXO % Recovery = [( <1> - <2> ) / <3> ) x 100 <br /> Method Blank File ID: LCS % Recovery = (<l> / <3> ) x 100 <br /> Blank Spike Fite ID: S A2062.TXO Relative Percent Difference = 1(<4> - <5> 1 / ((<4> + <5> ) x 0.51 x 100 <br /> Matrix Spike File ID: S_A2066.TXO (**) = Source: SAL-Houston Historical Data (1st Q 197) <br /> Matrix Spike Duplicate File ID: S_A2067.TXO (***) = Source: SPL-Houston Historical Data (1st Q 197) <br /> SAMPLES IN BATCH(SPL ID): 9801336-02A 9801336-01A 9801349-01A 9801349-02A <br /> 9801349-03A 9801344-06A 9801349-04A 9801349-05A <br /> 9801349-06A 9801349-08A 9801349-07A 9801334-04A <br /> 9801334-02A 9801334-03A <br />