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SPL BATCH QUALITY CONTROL REPORT ** Method 8020A*** HOUSTON LABORATORY 8880 INTERCHANGE DRIVE Z4HOUSTON,TEXAS 77054 _ wpl Batch Id: HP_5980916103900 PHONE (713)660-0901 Units: ug/L L A B O R A T O R Y C 0 N T R 0 L S A M P L E S P I K E Method Spike Blank Spike QC Limits(**) C 0 M P 0 U N D S Blank Result Added Result Recovery (Mandatory) <2> <3> <1> X X Recovery Range MTBE ND 50 42 84.0 72 - 128 Benzene ND 50 43 86.0 61 - 119 Toluene ND 50 45 90.0 65 125 EthyLBenzene ND 50 40 80.0 70 - 118 0 Xylene ND 50 43 86.0 72 117 M 8 P Xylene ND 100 89 89.0 72 116 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 0 M P 0 U N D S Results Added Duplicate Relative X Advisor Result Recovery Result Recovery Difference RPD <2> <3> <1> <4> <1> <5> Max. Recovery Range MTBE ND 20 19 95.0 19 95.0 0 20 39 150 BENZENE ND 20 20 100 19 95.0 5.13 21 32 164 TOLUENE NO ZO 17 85.0 16 80.0 6.06 20 38 159 :rs ETHYLBENZENE ND 20 15 75.0 14 70.0 6.90 19 S2 - 142 0 XYLENE NO 20 10 50.0 * 9.3 46.5 * 7.25 18 53 143 M 8 P XYLENE ND 40 9.1 22.8 * 8.2 20.5 * 10.6 17 53 144 * = Values outside CIC Range due to Matrix Interference (except RPD) Analyst: YN « = Data outside Method Specification Limits. Sequence Date: 09/16/98 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) SPL ID of sample spiked: 9809507-02A ND = Not Detected/Below Detection Limit Sample File 1D: S_I2065-TXO % Recovery = R <1> - <2> ) / <3> 1 x 100 Method Blank File ID: LCS Y Recovery = (<1> / <3> ) x 100 Blank Spike File ID: 5_12048-TX0 Relative Percent Difference = 1(<4> - <5> f / [(<4> + <5)- } x 0.51 x 100 Matrix Spike File ID: S_I2071-TX0 (**) = Source: SPL-Houston Historical Data (1ST Q 197) Matrix Spike Duplicate File ID: S_12072.TXO (***) = Source: SPL-Houston Historical Data (1ST 0 197) SAMPLES IN BATCH(SPL ID)- 9809512-01A 9809507-02A 9809506-01A 9809506-02A 9809507-01A 9809507-03A 9809326-09A 9809326-10A 9809326-12A 9809506-03A 9809506-04A