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** SPL BATCH QUALITY CONTROL REPORT ** HOUSTON LABORATORY <br /> Method 8020A *** 8880 INTERCHANGE DRIVE <br /> O HOUSTON, TEXAS 77054 <br /> PHONE(713)660-0901 <br /> Matrix: Soil Batch Id: HP J971003182700 <br /> Units: ug/kg — <br /> L A B O R A T O R Y C O N T R O L S AMP 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> % % Recovery Range <br /> ' MTBE ND 50 45 90.0 64 - 126 <br /> Benzene ND 50 43 86.0 66 - 123 <br /> Toluene ND 50 46 92.0 74 - 125 <br /> EthylBenzene ND 50 47 94.0 84 125 <br /> 0 Xylene ND 50 48 96.0 76 137 <br /> M & P Xylene ND 100 96 96.0 81 - 131 <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 % (Advisory} <br /> Result Recovery Result Recovery Difference RPD <br /> <2> <3> <1> <4> <1> <5> Max. Recovery Range <br /> MTBE ND 20 24 120 23 115 4.26 22 27 - 196 <br /> BENZENE ND 20 20 100 20 100 0 33 47 - 143 <br /> TOLUENE ND 20 19 95.0 18 90.0 5.41 35 46 - 148 <br /> ETHYLBENZENE ND 20 15 75.0 13 65.0 14.3 40 32 - 151 <br /> 0 XYLENE ND 20 12 60.0 8.6 43.0 33.0 * 24 35 - 143 <br /> M & P XYLENE ND 40 25 62.5 16 40.0 43.9 * 38 25 - 139 <br /> Analyst: LJ * = Values Outside QC Range. « = Data outside Method Specification limits. <br /> Sequence Date: 10/03/97 NC = Not Calculated (Sample exceeds spike 6y factor of 4 or more) <br /> SPL 10 of sample spiked: 9710155-07A ND = Not Detected/Below Detection Limit <br /> Sample File ID: J J7115.TX0 % Recovery = I( <1> - <2> ) / <3> 1 x 100 <br /> Method Blank Fite ID: LCS % Recovery = (<1> / <3> )-x 100 <br />' Blank Spike File ID: J_J7107.TX0 Relative Percent Difference = 1(<4> - <5> / I(<4> + <5> ) x 0.51 x 100 <br /> Matrix spike File ID: J J7109.TXO (**) = Source: SPL-Houston Historical Data (1st Q 197) <br /> Matrix Spike Duplicate File ID: J_J7110.TXO Source: SAL-Houston Historical Data (1st Q 197) <br />' SAMPLES IN BATCH SPL ID):, 9710155-02A 9710155-08A 9710155-09A 9710155-10A <br /> 9710155-11A 9710155-12A 9710155-13A 9710155-03A <br /> 9710155-04A 9710155-05A 9710155-06A 9710155-14A <br />' 9710155-15A 9710033-09A 9710259-01A 9710259-02A <br /> 9710259-04A 9710155-07A 9710155-01A <br /> 1 , <br />