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OF SPL BATCH QUALITY CONTROL REPCRT ** HOUSTON LABORATORY METHOD 8020/602 8880 INTERCHANGE DRIVE 40 HOUSTON, TEXAS 77054 Matrix: Aqueous Batch Id: HP_N961121172400 PHONE(713)660-0901 Units: pg/L L A B 0 R A T 0 R Y C O N T R O L S A M P L E i 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 49 96.0 63 - 120 I Benzene ND 50 4D 80.0 62 - 121 Toluene ND 50 45 90.0 66 - 136 EthylBenzene ND 50 43 86.0 70 - 136 O Xylene ND 50 43 86.0 74 - 134 M & P Xylene NO 100 86 86.0 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 k (AdvisorVl Result Recovery Result Recovery Difference RPD <2> <3> <1> <4> <1> <5> Max. I Recovery Range MTBE 880 20 860 NC 870 NC NC 20 39 - 150 BENZENE 3.6 20 22 92.0 22 92.0 0 25 39 - 150 TOLUENE ND 20 21 105 20 l0O 4.88 26 56 - 134 • ETHYLBENZENE ND 20 20 100 19 95.0 5.13 38 61 - 128 O XYLENE ND 20 20 100 19 95.0 5.13 29 40 - 130_ M & P XYLENE ND 40 40 100 40 100 0 20 43 - 152 Analyst: RL * Values Outside QC Range Sequence Date: 11/21/96 NC = Not Calculated (Sample exceeds spike by factor of 4 or more) SPL ID of sample spiked: 9611995-OIA ND - Not Detected/Below Detection Limit Sample File ID: N_6KO87.TXO % Recovery - [( <1> - <2> ) / <3> 1 x 100 Method Blank File ID: LCS V Recovery + (<1> / <3> ) x 100 Blank Spike File ID: N_6KO79.TX0 Relative Percent Difference - 1 (<4> - <5> / [(<4> + <5> ) x 0.51 x 100' Matrix Spike File ID: N_6KO8I.TX0 (**) Source: SPL-Houston Historical Data (3rd Q 195) Matrix Spike Duplicate File ID: N_6K082.TX0 ("**) Source: SPL-Houston Historical Data (2nd Q 195) SAMPLES IN SATCH SPL ID): 9611852-02A 9611852-03A 9611911-OIA 9611911-02A 9611911-OSA 9611911-04A 9611911-03A 9611911-07A 9611911-OSA 9611911-06A 9611B68-02A 9611B68-01A 9611995-OIA 9611568-03A 9611995-01A