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SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY METHOD 8020/602 8880 INTERCHANGE DRIVE O HOUSTON,TEXAS T7054 Matrix: Aqueous Batch Id: HP_N961124044900 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 Blank Spike QC Limits(**) C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <2> <3> <1> '1• Recovery Range MTBE ND 50 52 104 63 - 120 Benzene ND 50 41 82.0 62 - 121 Toluene ND 50 46 92.0 66 - 136 EthylBenzene ND 50 44 88.0 70 - 136 0 Xylene ND 50 44 88.0 74 - 134 M & P Xylene ND 100 89 89.0 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 1 (Advisory) - Result Recovery Result Recovery Difference RPD <2> <3> <1> <4> <1> <5> Max. I Recovery Range MTBE 390 20 400 NC 390 NC NC 20 39 - 150 BENZENE 3.1 20 18 74.5 18 74.5 0 25 39 - 150 TOLUENE 3.6 20 20 82.0 19 77.0 6.29 26 56 - 134 ETHYLBENZENE ND 20 16 80.0 16 80.0 0 38 61 - 128 O XYLENE ND 20 17 85.0 17 85.0 0 29 40 - 130 M & P XYLENE 1.0 40 34 82.5 33 80.0 3.08 20 43 - 152 Analyst: AA Values Outside QC Range Sequence Date: 11/24/96 NC = Not Calculated (Sample exceeds spike by factor of 4 or morel SPL ID of sample spiked: 9611D34-03A ND = Not Detected/Below Detection Limit Sample File ID: N 6K197.TXC t Recovery [{ <1> - <2> 1 / <3> ) x 100 Method Blank File ID: LCS 4 Recovery = (<1> / <3> ] x 100 Blank Spike File ID: N_6K184.TX0 Relative Percent Difference = 1 (<4> - <5> I / [(<4> + <5> 1 x 0.51 x 100 Matrix Spike File ID: N_6K189.TX0 (**) = Source: SPL-Houston Historical Data (3rd Q 195) Matrix Spike Duplicate File ID: N_6K190.TX0 (***} = Source: SPL-Houston Historical Data (2nd Q 195) j SAMPLES IN BATCH SPL ID) - 9611D34-03A 9611D34-05A 9611A28-04A 9611A28-05A 9611A87-01A 9611A87-02A 9611A87-03A 96IIA83-04A 9611911-06A 9611A87-04A 9611D34-01A 9611D34-02A 9611D39-01A 9611863-04A •