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+ SPL BATCH QUALITY CONTROL REPORT •* HOUSTON LABORATORY <br /> METHOD 8020*** 8860 INTERCHANGE DRIVE <br /> Q HOUSTON, TEXAS 77054 <br /> Aqueous111114� .,.: <br /> rar Batch Id: HP N970316084900 PHONE(7i 3)6640901 <br /> Units: µg/L <br /> L A B O R A T O R Y C O N T R O L S A M P L E <br /> S P I K E Method Spike Blank Spike QC Limits(*'1 <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> t 4 Recovery Range <br /> MTBE ND 50 46 92.0 20 - 110 <br /> Benzene ND 50 46 92.0 62 - 121 <br /> Toluene ND 50 44 88.0 66 - 136 <br /> EthylBenzene ND 50 51 102 70 - 136 <br /> O Xylene ND 50 51 102 74 - 134 <br /> M & P Xylene NO 100 100 100 77 - 140 <br /> M A T R I X S P I K E S <br /> S P I K E Sample Spike Matrix Spike Matrix Spike MS/MSD QC Limits(***) <br /> C O M P O U N D S Results Added Duplicate Relative Ir (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE ND 20 29 140 27 135 3.64 20 39 - 150 <br /> BENZENE ND 20 211 105 21 105 0 25 39 - 150 <br /> TOLUENE ND 20 18 90.0 17 85.0 5.71 26 56 - 134 <br /> ETHYLBENZENE ND 20 20 100 20 100 0 38 61 - 128 <br /> 0 XYLENE ND 20 21 105 20 100 4.88 29 40 - 130 <br /> M & P XYLENE ND 40 43 108 43 108 0 20 43 - 152 <br /> Analyst: WK * Values Outside QC Range. q . Data outside Method Specification limits. <br /> Sequence Date: 03/16/97 NC - Not Calculated (Sample exceeds spike by factor of 4 or more) <br /> SPL ID of sample spikedt 9703631-04A ND - Not Detected/Below Detection Limit <br /> Sample File ID: N_C7538.TXO % Recovery - [( <1> - <2> } / <3> ] x 100 <br /> Method Blank File ID: LCS 4 Recovery . (<1> / <3> ) x 100 <br /> Blank Spike File ID: N_C7531.TXO Relative Percent Difference - I (<4> - <5> / [(<4> + <5> } x 0.5] x 100 <br /> Matrix Spike File ID: N_C7533.TXO (*+) R Source: SPL-Houston Historical Data (4th Q 195) <br /> Matrix Spike Duplicate File ID: N_C7534.TXO (**+) Source: SPL-Houston Historical Data (3rd Q 196) <br /> SAMPLES 1N BATCH(SPL ID) : 9703540-03A 9703540-04A 9703622-OIA 9703622-02A <br /> 9703622-03A 9703631-OIA 9703631-02A 9703631-03A <br /> 9703663-06A 9703663-05A 9703733-04A 9703631-04A <br /> 9703631-05A 9703540-OIA 9703540-02A <br />