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* SPL BATCH QUALITY CONTROL REPORT •* PAGE HOUSTON LABORATORY <br /> Modified 8015 - Gasoline 8880 INTERCHANGE DRIVE <br /> ® HOUSTON TEXAS 77054 <br /> PHONE(713)660-0901 <br /> Matrix Aqueous Batch Id HP_O950630053400 <br /> Units mg/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(**) <br /> C O M P O U N D S Blank Result Added Result Recovery (Mandatory) <br /> <2> <3> <1> t t Recovery Range <br /> Petroleum Hydrocarbons ND 1 0 0 97 97 0 56 - 139 <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 t (Advisory) <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> c4> <1> <5> Max Recovery Range <br /> Petroleum Hydrocarbons ND 0 9 0 99 110 1 1 1 122 10 3 18 40 - 158 <br /> Analyst VHZ * - Values Outside QC Range <br /> Sequence Date 06/30/95 NC = Not Calculated (Sample exceeds Spike by factor of 4 or more) <br /> SPL ID of sample spiked 9506961-03A ND = Not Detected/Below Detection Limit <br /> Sample File ID 0_025 TXO t Recovery = {( <1> - <2> ) / <3> } x 100 <br /> Method Blank File ID LCS t Recovery . (<l> / <3> } x 100 <br /> Blank Spike File ID 0017 TXO Relative Percent Difference = 1 (<4> - <5> 1 / [(<4> + <5> } x 0 5) x 100 <br />• Matrix Spike File ID 0_020A TXO (**) = Source SPL-Houston Historical Data <br /> Matrix Spike Duplicate File ID 0021 TXO (***) Source SPL-Houston Historical Data <br /> SAMPLES IN BATCH SPL ID 9506961-01A 9506980-10A 9506980-09A 9506980-68A <br /> 9506980-07A 9506980-06A 9506980-OSA 9506980-04A <br /> 9506980-03A 9506980-02A 9506980-OIA 9506961-OSA <br /> 9506961-04A 9506961-03A 9506961-02A 9506961-06A <br /> r <br /> Idelis Willi& QC Officer <br />