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** PL BATCH QUALITY CONTROL REPORT ** PAGE HOUSTON LABORATORY METHOD 8020 8880 INTERCHANGE DRIVE ® HOUSTON TEXAS 77054 . — PHONE(713)660 0901 Matrix Aqueous Batch Id HP 0950630024500 Units jug/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 OC Limits(**) C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <2> <3> <1> It t Recovery Range Benzene ND 50 46 96 0 61 - 123 Toluene ND 50 50 100 62 - 122 EthylBenzene ND 5o 51 102 56 - 119 0 Xylene ND 50 51 102 32 - 160 M & P Xylene ND 100 110 110 32 - 160 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 O U N D S Results Added Duplicate Relative t (Advisory) Result Recovery Result Recovery Difference RPD <2> <3> <1> <4> <1> <5> Max Recovery Range Benzene 8 20 29 105 31 115 9 09 25 39 - 150 Toluene 2 20 20 90 0 22 100 10 5 26 56 - 134 EthylBenzene ND 20 19 95 0 21 105 10 0 38 61 - 128 O Xylene 6 20 23 85 0 25 95 0 11 1 20 40 - 130 • M & P Xylene 11 40 47 90 0 51 100 10 5 20 43 - 152 Analyst VHZ * Values Outside QC Range Sequence Date 06/30/95 NC a Not Calculated (Sample exceeds spike by factor of 4 or more) SPL ID of sample spiked 9506961-02A ND - Not Detected/Below Detection Limit Sample File ID 00_024 TXO t Recovery = [( <1> - <2> ) / <3> ) x 100 Method Blank File ID LCS % Recovery - (<1> / <3> ) x 100 Blank Spike File ID 00012 TXO Relative Percent Difference = 1 (<4> - <5> / [(<4> + <5> J x 0 5) x 100 Matrix Spike File ID 00_015 TXO {**} Source SPL-Houston Historical Data Matrix Spike Duplicate File ID 00_0I6 TXO Source SPL-Houston Historical Data SAMPLES IN BATCH SPL ID 9506961-01A 9506960-10A 9506980-09A 9506960-OBA 9506980-07A 9506980-06A 9506980-05A 9506980-04A 9506980-03A 9506980-02A 9506980-GIA 9506961-OSA 9506961-04A 9506961-03A 9506961-02A 9506961-06A v Idelis Williams, Officer