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* PL BATCH QUALITY CONTROL REPORT ** PAGE HOUSTON LABORATORY <br /> METHOD 8020 8880 INTERCHANGE DRIVE <br /> ® HOUSTON HONE(713)660 0901 <br /> Matrix Aqueous Batch Id HP_J950617223900 <br /> Units µg/L <br /> L A B O R A T O R Y CONTROL SAM PLE <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> k Recovery Range <br /> Benzene ND 50 52 104 61 - 123 <br /> Toluene ND 50 53 106 62 - 122 <br /> EthylBenzene ND 50 54 108 56 - 119 <br /> O Xylene ND 50 56 112 32 - 160 <br /> M & P Xylene ND 100 110 110 32 - 160 <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 OC Limits(***) <br /> C O M P O U N D S Results Added Duplicate Relative t (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max I Recovery Range <br /> Benzene ND 20 22 110 21 105 4 65 25 39 - 150 <br /> Toluene ND 20 20 100 19 95 0 5 13 26 56 - 134 <br /> EthylBenzene ND 20 19 95 0 18 90 0 5 41 38 61 - 128 <br /> 0 Xylene 2 20 18 80 0 16 70 0 13 3 20 40 - 130 <br /> M & P Xylene ND 40 32 80 0 29 72 5 9 84 20 43 - 152 <br /> Analyst VHZ * Values Outside QC Range <br /> Sequence Date 06/17/95 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked 9506359-OIA ND = Not Detected/Below Detection Limit <br /> Sample File ID J-184 TXO % Recovery - [( <1> - <2> ) / <3> ) x 100 <br /> Method Blank File ID LCS % Recovery . (<l> / <3> ) x 100 <br /> Blank Spike File ID J`176 TXO Relative Percent Difference 1 (<4> - <5> / [(<4> + <5> ) x 0 51 x 100 <br /> Matrix Spike File ID J 179 TXO (**} Source SPL-Houston Historical Data <br /> Matrix Spike Duplicate File ID J180 TXO i***) - Source SPL-Houston Historical Data <br /> SAMPLES IN BATCH(SPL ID) 9506560-01A 9506561-OIA 9506559-01A 9506564-01A <br /> 9506563-OIA 9506562-01A 9506391-03A 9506388-04A <br /> 9506360-05A 9506360-04A 9506360-03A 9506360-02A <br /> 9506360-01A 9506359-04A 9506359-03A 9506359-01A <br /> . 9506357-04A 9506359-02A <br /> Idelis Williamaic Officer <br />