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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 Id-. HP_N970404041200 <br /> Units: ug/L <br /> L A B O R A T O R Y C ONTROL S AMPLE <br /> S P I K E Method Spike Blank Spike QC Limits(**) <br /> COMPOUNDS Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> t k Recovery Range <br /> MTBE ND 50 38 76.0 20 - 110 <br /> Benzene ND 50 45 90.0 62 - 121 <br /> Toluene ND 50 49 98.0 66 - 136 <br /> Ethyl-Benzene ND 50 49 98.0 70 - 136 <br /> 0-Xylene ND 50 50 100 74 - 134 <br /> M and P Xylene ND 100 98 98.0 77 - 140 <br /> M A T R I X S P I K E S <br /> S P I X E Sample Spike Matrix Spike Matrix Spike MS/MSD QC Limits(***) <br /> C 0 M P 0 U N D S Results Added Duplicate Relative k (Advisor <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE ND 20 19 95.0 19 95.0 0 20 39 - 150 <br /> BENZENE ND 20 19 95.0 20 100 5.13 25 39 - 150 <br /> TOLUENE ND 20 19 95.0 19 95.0 0 26 56 - 134 <br /> ETHYL-BENZENE ND 20 19 95.0 19 95.0 0 38 61 - 128 <br /> 0-XYLENE ND 20 19 95.0 20 100 5.13 29 40 - 130 <br /> M AND P XYLENE ND 40 39 97.5 39 97.5 0 20 43 - 152 <br /> Analyst: JN * values Outside QC Range. s = Data outside Method Specification limits. <br /> Sequence Date: 04/05/97 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9704110-01A ND Not Detected/Below Detection Limit <br /> Sample File ID: N D7133.TX0 k Recovery - [( <1> - <2> ) / <3> ] x 100 <br /> Method Blank File ID: LCS k Recovery = (<1> / <3> ) x 100 <br /> Blank Spike File ID: N_D7161.TX0 Relative Percent Difference I (<4> - <5> / [(<4> + <5> ) x 0.51 x 100 <br /> Matrix Spike File ID: N_D7130.TX0 (**) Source: SPL-Houston Historical Data (4th Q 195) <br /> Matrix Spike Duplicate File ID: N D7131.TX0 (***) Source: SPL-Houston Historical Data (3rd Q 196) <br /> SAMPLES IN BATCH(SPL IN: 9703F55-09A 9703E82-06A 9703E82-07A 9703F55-07A <br /> 9703F55-08A 9703F80-05A 9703F55-01A 9703F80-OlA <br /> 9703F55-02A 9703F80-02A <br /> +/ <br />