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�� I1 SPL BATCH QUALITY CONTROL REPORT ** PACAOUSTON LABORATORY METHOD 8020**' 1 8880 INTERCHANGE DRIVE HOUSTON TEXAS 77054 ixqueous Batch Id HP_S960313040400 PHONE(713)660-0901 Units ug/L L A B O R A T O R Y C O N T R 0 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> % Recovery Range Benzene ND 50 47 94 0 62 - 121 Toluene ND 50 47 94 0 66 - 136 Ethyl9enzene ND 50 46 92 0 70 - 136 0 Xylene ND 50 46 92 0 74 - 134 M & P Xylene ND 100 98 98 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 OC Limitsf***) C O M P O U N D S Results Added Duplicate Relative W (Advisory) Result Recovery Result Recovery Difference RPD <2> <3> <1> <4> <1> <5> Max Recovery Range BENZENE ND 20 22 110 22 110 0 25 39 - 150 TOLUENE ND 20 21 105 20 100 4 88 26 56 - 134 ETHYLBENZENE ND 20 22 110 21 105 4 65 38 61 - 128 0 XYLENE ND 20 21 105 20 100 4 88 29 40 - 130 M & P XYLENE ND 40 46 115 43 108 6 28 20 43 - 152 Analyst DAO = Values Outside QC Range Sequence Date 03/13/96 NC - Not Calculated (Sample exceeds spike by factor of 4 or morel SPL ID of sample spiked 9603287-01A ND - Not Detected/Below Detection Limit Sample File ID SS_955 TX0 I Recovery - [( <1> - <2> I / <3> ] x 100 Method Blank File ID LCS 'F Recovery = 1<1> / <3> I x 100 Blank Spike File ID SS_932 TXO Relative Percent Difference = I (<4> - <5> / [(<4> + <5> } x 0 5] x 100 Matrix Spike File ID SS_951 TX0 (") Source SPL-Houston Historical Data (3rd Q 195) Matrix Spike Duplicate File ID SS_952 TXO (***I = Source SPL-HquStOn Historical Data (4th Q 194) SAMPLES IN BATCH(SPL ID) 9603227-03A 9603269-01A 9603249-OIA 9603251-DIA 9603251-02A 9603251-03A 9603251-OSA 9603541-05A 9603287-OIA 9603289-03A 9603310-04A 9603299-OIA 9603299-02A 9603289-OIA 9603299-02A 9603291-OIA 9603180-02A 9603227-01A 9603227-02A QC Officer 1