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r� n ** SPL BATCH QUALITY CONTROL REPORT * * PAGE 1 METHOD 8020 . Matrix Aqueous Batch Id HP_J950316014500 Units µg/L L A B O R A T O R Y C O N T R O L S A M P L E S P I K E Method Spike Blank Spike QC Limits(**) C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <2> <3> <1> t % Recovery Range Benzene ND SO 44 88 0 61 - 123 Toluene ND 50 46 92 0 62 - 122 EthylBenzene ND 50 44 88 0 56 - 119 4 O Xylene ND 50 47 94 0 32 - 160 M & P Xylene ND 100 99 99 0 32 - 160 y M A T R I X S P I K E S S P I K E Sample Spike Matrix Spike Matrix Spike MS/MSD QC Limits(***) C O M P O U N D S Results Added Duplicate Relative t (Advisory) Result Recovery Result Recovery Difference RPD <2> <3> <1> <4> <1> c5> Max Recovery Range Benzene 1 0 20 22 105 22 105 0 25 39 - 150 Toluene 2 8 20 21 91 0 22 96 0 5 35 26 56 - 134 EthylBenzene 0 9 20 17 80 5 18 65 5 6 02 38 61 - 126 0 Xylene 1 6 20 17 77 0 16 72 0 6 71 20 40 - 130 M & P Xylene 4 4 40 32 69 0 32 69 0 0 20 43 - i52 Analyst YN - Values Outside QC Range Sequence Date 03/16/95 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) SPL ID of sample spiked 9503413-OSA ND = Not Detected/Below Detection Limit Sample File 10 J_005 TXO % Recovery = [( <1> - <2> ) / <3> 1 x 100 Method Blank File ID LCS t Recovery = ( / <3> } x 100 Blank Spike File ID J_995 TXO Relative Percent Difference (<4> - <5> / [(<4> + <5> ) x 0 51 x 100 Matrix Spike File ID J_029 TXO (**) s Source SPL-Houston Historical Data Matrix Spike Duplicate File ID J_030 TXO (***) Source SPL-Houston Historical Data SAMPLES IN BATCH(SPL ID) 9503389-07A 9503413-07A 9503435-04F 9503435-05F 9503435-06F 9503488-01A 9503488-02A 9503486-03A 9503488-04A 9503426-03A 9503389-14A 9503413-04A 9503205-02A 9503308-OIF 9503413-OSA 9503413-06A • 9503474-07A Idelis willia s QC Officer