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0 LAB CORE LABORATORIES <br /> QUAL I T Y C O N T R O L R E S U L T S <br /> Job Number 990931 Report Date 05/31/1999 <br /> CUSTOMER IT Group PROJECT- Southland Martinez ATTN Bob Butler <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> Test Method EPA 8015Mod Batch 6448 Analyst evd <br /> Method Desc n ptton Total Volatile Petroleum Hydrocarbons Units ug/L <br /> MS Method Blank 05/26/1999 1000 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> lasoLine Range Petroleum Hydrocarbons 2 <br /> LC5 Laboratory Control Sample 09051202 05/26/1999 1052 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Gasoline Range Petroleum Hydrocarbons 1056 1000 0 105 6 W 50-150 <br /> LCD Laboratory Control Sample Duplicate 09051202 05/26/1999 3118 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> the Range Petroleum Hydrocarbons 1058 1056 1000 0 105 8 y 50-150 <br /> 0 2 30 <br /> Ms Matrix Spike 09051202 990931-2 05/27/1999 0044 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> soltne Range Petroleum Hydrocarbons 1198 1000 0 24 117 50-150 <br /> MSD Matrix Spike Duplicate 09051202 990931-2 05/27/1999 0110 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Gaso[tne Range Petroleum Hydrocarbons 1127 1198 1000 0 24 110 50-150 <br /> 6 1 30 <br /> 7 Test Method EPA 8020A 8atch 6447 Analyst evd <br /> Method Description Volatile Organics -Aromatics Units ug/L <br /> MB Method Blank 05/26/1999 1000 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> nzene 0 00 <br /> hylbenzene 0 00 <br /> Methyl-t-Butyl Ether (MTBE) 0 00 <br /> luene 0 00 <br /> [encs (total) 0 OD <br /> ' Page 6 <br /> * %=% REC, R=RPD, A=ABS Diff D=% Diff <br />