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+ SPL BATCH QUALITY CONTROL REPORT " HOUSTON LABORATORY Method 8020A •+• 8880 INTERCHANGE DRIVE ,• HOUSTON. TEXAS 77054 O :•f{f Batch Id: HP 0980821024300 PHONE (713)660-0901 Unita: ug/kg 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 MTBE ND 50 42 84.0 64 - 126 Benzene ND 50 43 86.0 60 - 116 Toluene ND 50 44 88.0 64 - 122 EthylBenzene ND 50 44 88.0 68 - 127 O Xylene ND 50 45 90.0 68 - 127 M & P Xylene ND 100 87 87.0 68 - 129 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> c3> <1> <4> <1> <S> Max_ Recovery Range MTBE ND 20 19 95.0 22 110 14.6 22 27 - 196 BENZENE ND 20 22 110 27 135 20.4 33 35 - 139 �-= TOLUENE ND 20 22 110 26 130 16.7 35 31 - 137 _.= ETHYLBENZENE ND 20 22 110 24 120 8.70 40 21 - 141 0 XYLENE ND 20 22 110 24 120 8.70 24 25 - 139 M E P XYLENE ND 40 45 112 48 120 6.90 38 19 - 144 Values outside QC Range due to Matrix Interference (except RPD) Analyst: CJ c Data outside Method Specification limits. Sequence Dace: 08/21/98 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) SPL ID of sample spiked: 9808388-OIA ND = Not Detected/Below Detection Limit Sample File ID: O H3192_TX0 t Recovery - [( <1> - <2> ) / <3> ] x 100 Method Blank File ID: LCS k Recovery = (cl> / <3> ) x 100 Blank Spike File ID: O-H3183.TXO Relative Percent Difference = 1 (<4> - <5> j / [(<4> + <5> ) x 0.51 x 100 Matrix Spike File ID: O-H3198.TX0 (+') = Source: SPL-Houston Historical Data (let Q 197) Matrix Spike Duplicate File ID: O_H3186.TXO Source: SPL-Houston Historical Data (1st Q 197) SAMPLES IN BATCH(SPL ID) : 9808718-02A 9808718-03A 9808718-04A 9808828-01A 9808836-01A 9808836-02A