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** SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> METHOD 8020 8880 INTERCHANGE DRIVE i <br /> HOUSTON,TEXAS 77054 <br /> PHONE (713)660-0901 <br /> Matrix: Aqueous Batch Id: VARE950722201800 <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 Limitsf**) <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> t %- Recovery Range <br /> MTBE ND 50 50 100 72 - 128 <br /> Benzene ND 50 47 94.0 61 - 119 <br /> Toluene ND 50 49 98.0 65 - 125 <br /> EthylBenzene ND 5D 46 92.0 70 - 116 <br /> O Xylene ND 50 53 106 72 - 117 <br /> M & P Xylene ND 100 99 99,0 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 O M P O U N D S Results Added Du licate Relative & (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE ND 20 19 95.0 25 125 27.3 * 20 39 - 150 <br /> BENZENE ND 20 17 85.0 21 105 21.1 * 21 32 - 164 <br /> TOLUENE ND 20 17 85.0 23 115 30.0 * 20 38 - 159 <br /> ETHYLBENZENE ND 20 16 80.0 20 100 22.2 * 19 52 - 142 <br /> 0 XYLENE NO 20 17 85.0 23 115 30.0 * 18 53 - 143 <br /> M & P XYLENE ND 40 34 85.0 44 110 25.6 * 17 53 - 144 <br /> * = Values outside QC Range due to Matrix Interference (except RPD) <br /> Analyst; DR < Data outside Method Specification limits. <br /> Sequence Date: 07/22/99 NC - Not Calculated (Sample exceeds spike by factor of 4 or mare) <br /> SPL ID of sample spiked: 9907710-06A ND = Not Detected/Below Detection Limit <br /> Sample File ID: E_G3134.TX0 % Recovery - (( <1> - <2> ) / <3> ) x 100 <br /> Method Blank File ID: LCS t Recovery - (<1> / <3> ) x 100 <br /> Blank Spike File ID: E_G3119.TX0 Relative Percent Difference (<4> - <5> ! / [(<4> + <5> ) x 0,5) x 100 <br /> Matrix Spike File ID: E_G315I.TXO (**) = Source: SPL-Houston Historical Data (1st Q 197) <br /> Matrix Spike Duplicate File ID: E_G3152.TX0 (***( a Source: SPL-Houston Historical Data (1st Q 197) <br /> SAMPLES IN BATCH(SPL ID) : 9907710-05A 9907710-07A 9907710-08A 9907710-10A <br /> 9937710-IIA 9907710-12A 9907710-13A 9907710-14A <br /> 9907710-ISA 9907710-16A 9907710-17A 9907756-OIA <br /> 9907597-04A 9907710-06A 9907710-02A 9907710-01A <br /> 9907710-09A 9907710-03A 9907710-04A <br />