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SPL BATCH QUALITY CONTROL REPORT *• PAGROUSTON LABORATORY METHOD 80204*- 8860 INTERCHANGE DRIVE HOUSTON TEXAS 77054 Matrix Aqueous Batch Id HP_5960312034600 PHONE(713)660.0901 Units pg/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 BlankSpike QC Limits(**) C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <2> 43> <1> % k Recovery Range Benzene ND 50 51 102 62 - 121 Toluene ND 50 51 102 66 - 136 EthylBenzene ND 50 54 108 70 - 136 0 Xylene NO 50 53 106 74 - 134 M & P Xylene ND 100 110 110 77 - 140 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 I (Advisory) Result Recovery Result Recovery Difference APD <2> <3> <1> <4> <1> <5> Max I Recovery Range BENZENE 5 20 25 100 25 100 0 25 39 -- 150 TOLUENE 2 20 25 115 25 115 0 26 56 - 134 ETHYLBENZENE 4 20 25 105 27 115 9 09 38 61 - 128 O XYLENE 1 20 23 110 25 120 8 70 29 40 - 130 M & P XYLENE 10 40 53 108 57 118 & 85 20 43 - 152 Analyst DAO * = Values Outside QC Range Sequence Date 03/12/96 NC Not Calculated (Sample exceeds spike by factor of 4 or morel SPL ID of sample spiked 9603251-04A ND Not Detected/Below Detection Limit Sample File ID SS_937 TXO % Recovery - [( <1> - <2> ) / <3> ) x 100 Method Blank File ID LCS % Recovery - (<1> / <3> ) x 100 Blank Spike File ID SS_907 TXO Relative Percent Difference = I (<4> - <5> / [(<4> + <5> ) x 0 51 x 100 Matrix Spike File ID SS-921 TXO (**) = Source SPL-Houston Historical data (3rd Q 195) Matrix Spike Duplicate File ID SS_922 TXO {•**) = Source SPL-Houston Historical Data (4th Q 194) SAMPLES IN BATCH{SPL ID) 9603253-OSA 9603253-04A 9603180-03A 9603227-04A 9603247-02A 9603248-04A 9603249-02A 9603252-OIA 9603248-OSA 9603248-03A 9603247-OIA 9603251-04A 9603251-06A 9603248-06A 9603252-02A 9503253-01A 9603248-02A 9603253-03A 9603253-02A 9603180-OIA / QC Officer