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** SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> METHOD 8020 8880 INTERCHANGE DRIVE <br /> HOUSTON, TEXAS 77054 <br /> PHONE (743)660-0904 <br /> Matrix: Aqueous Batch Td: HP_N99080208300I <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> t k Recovery Range <br /> MTHE ND 50 49 96.0 72 - 128 <br /> Benzene ND 50 50 100 61 - 119 <br /> Toluene ND 50 50 100 65 - 125 <br /> EthylBenzene ND 50 48 96.0 70 - 118 <br /> 0 Xylene ND 50 49 98.0 72 - 117 <br /> M F. P Xylene ND 100 100 100 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 Du licate Relative % (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> e5> Max. Recovery Range <br /> MTBE ND 20 19 95.0 19 95.0 0 20 39 - 150 <br /> BENZENE ND 20 17 85.0 18 90.0 5.71 21 32 - 164 <br /> TOLUENE ND 20 rr 17 85.0 18 90.0 5.71 20 3B - 159 <br /> ETHYLSENZENE ND 20 I 16 80.0 17 B5.0 6.06 19 52 - 142 <br /> 0 XYLENE ND 20 I 17 85.0 17 85.0 0 18 53 - 143 <br /> M & P XYLENE ND 40 33 82.5 35 87.5 5.88 i 17 53 - 144 <br /> * - Values outside QC Range due to Matrix Interference (except RPD) <br /> Analyst: WLR < - Data outside Method Specification limits. <br /> Sequence Date: OB/02/99 NC - Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked: 9907893-02A ND = Not Detected/Below Detection Limit <br /> Sample File ID: N H1030.TX0 % Recovery - [( <1> - <2> <br /> ) / <3> ] x 100 <br /> Method Blank File ID: LCS'% Recovery = (el> / <3> J x 100 <br /> Blank Spike File ID: N H1004.TX0 Relative Percent Difference (<4> - <5> ! / [(<4> + <5> ) x 0.51 x 100 <br /> Matrix Spike File ID: N—H1025.TX0 (**) G Source: SPL-Houston Historical Data (lst Q '97) <br /> Matrix Spike Duplicate File ID: N—H1026.TX0 [***} Source: SPL-Houston Historical Data (1st Q 197) j <br /> SAMPLES IN BATCH(SPL ID) : 9907A97-01A 9907H17-01A 9907817-02A 9907BO4-01A <br />