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a _ <br /> * PL BATCH QUALITY CONTROL REPORT ** PAGE H70USTON LABORATORY <br /> METHOD 8020 8880 INTERCHANGE DRIVE <br /> HOUSTON <br /> PHONE(713 660-09014 <br /> Matrix Aqueous Batch Id HP_N950614180600 <br /> Unite Ag/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 /> 42> <3> <1> % it Recovery Range <br /> Benzene ND 50 44 88 0 61 - 123 <br /> Toluene ND 50 51 102 62 - 122 <br /> EthylBenzene ND 50 47 94 0 56 - 119 <br /> 0 Xylene ND 50 50 100 32 - 160 <br /> M 4 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 QC Limits(***) <br /> C O M P O U N D S Results Added Duplicate Relative % (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max I Recovery Range <br /> Benzene ND 20 23 115 23 115 0 25 39 - 150 <br /> Toluene ND 20 26 130 27 135 * 3 77 26 56 - 134 <br /> EthylBenzene ND 20 22 110 23 115 4 44 38 61 - 128 <br /> 0 Xylene ND 20 23 115 22 110 4 44 20 40 - 130 <br />• M & P Xylene ND 40 47 118 46 115 2 58 20 43 - 152 <br /> Analyst YN * Values Outside QC Range <br /> Sequence Date 06/14/95 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spiked 9506143-03A ND = Not Detected/Below Detection Limit <br /> Sample File ID NN_448 TXO t Recovery - (( <1> - <2> ) / <3> ) x 100 <br /> Method Blank File ID LCS % Recovery s (<1> / <3> ) x 100 <br /> Blank Spike File ID NN 428 TXO Relative Percent Difference 1 (<4> - <5> 1 / [(<4> + <5> } x 0 51 x 100 <br /> Matrix Spike File ID NN_458 TXO {**) Source SPL-Houston Historical Data <br /> Matrix Spike Duplicate File ID NN 459 TXO (***) Source SPL-Houston Historical Data <br /> SAMPLES IN BATCH(SPL ID) 9506348-09A 9506341-03A 9506275-02A 9506564-02A <br /> 9506563-02A 9506562-02A 9506561-02A 9506560-02A <br /> 9506559-02A 9506143-03A 9506348-08A 9506331-02A <br /> 9506331-01A 9506147-03H 9506147-02H 9506147-01H <br /> . 9506338-OBA <br /> Idelis Williams, Q Officer <br />