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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 HP_S990922090200 <br /> Units ug/L <br /> L A B O 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> <k> 4; !k Recovery Range <br /> MTBE NII 50 46 92 0 72 - 128 <br /> Benzene ND 50 47 94 0 61 - 119 <br /> Toluene ND 50 47 94 0 65 - 125 <br /> Ethylaenzene ND 50 47 94 0 70 - 118 <br /> D Xylene ND 50 47 94 0 72 - 117 <br /> M & P Xylene ND 100 94 94 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 Du7p13.cate Relative 'k (AdvisorX) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max Recovery Range <br /> MTBE ND 20 20 100 20 100 0 20 39 - 150 <br /> BENZENE ND 20 20 100 20 100 0 21 32 - 164 <br /> TOLUENE ND 20 27 135 25 125 7 69 20 38 - 159 <br />• ETHYLBENZENE ND 20 21 105 20 100 4 88 19 52 - 142 <br /> 0 XYLENE ND 20 22 110 21 105 4 65 18 53 - 143 <br /> M & P XYLENE ND 40 45 112 44 110 1 80 17 53 - 144 <br /> * t Values outside QC Range due to Matrix Interference {except RPD) <br /> Analyst WLR « Data outside Method Specification limits <br /> Sequence Date 09/22/99 NC = Not Calculated (Sample exceeds spike by factor of 4 or morel <br /> SPL ID of Sample spiked 9909515-07A ND b Not Detected/Below Detection Limit <br /> Sample File ID S_I3120 TXO % Recovery = [( <1> - <2> ) / <3> 1 x 100 <br /> Method Blank File ID LCS lk Recovery = (<l> / <3> ) x 100 <br /> Blank Spike File ID S_I3096 TX0 Relative Percent Difference = I (<4> - <5> / [(<4> + <5> } x 0 51 x 100 <br /> Matrix Spike File ID S_I3114 TXO (**) = Source SPL-Houston Historical Data (1st Q 197) <br /> Matrix Spike Duplicate File ID S_I3115 TX0 (***1 Source SPL-Houston Historical Data (1st Q 197) <br /> SAMPLES IN BATCH(SPL ID) 9909574-01A 9909574-03A 9909574-05A 9909623-IIA <br /> 9909624-12A 9909626-IOA 9909515-02A 9909574-02A <br /> 9909574-04A 9909626-1OA 9909574-01A 9909515-02A <br /> 9909515-0GA 9909515-08A 9909515-07A 9909515-OSA <br />