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COULAB CORE LABORATORIES <br /> Q U A L I T Y C 0 N T R L R E S U L T S <br /> Job Number 990877 Report Date 05/31/1999 <br /> ' CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Ttme <br /> ' Test Method EPA 8015Mod Batch 6379 Analyst evd <br /> Method Description Total VOLat1Le Petroleum Hydrocarbons U m is ug/L <br /> ' MB Method Blank 05/21/1999 1123 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> ' Gasoline Range Petroleum Hydrocarbons 2 <br /> LCS Laboratory Control Sample 09051202 05/21/1999 1149 <br /> Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits <br /> Gasoline Range Petroleum Hydrocarbons 956 1000 0 95 6 50 150 <br /> ' LCD Laboratory Control Sample Duplicate 09057202 DS/21/1999 1215 <br /> Parameter/Test Description QC Result OC Rcsult True Value Orig Value Catc Result * Limits <br /> soline Range Petroleum Hydrocarbons 939 956 1000 0 93 9 50-150 <br /> 1 8 30 <br /> ' MS _ Matrix Spike 09DS1202 990877-5 OS/22/1999 023fl <br /> Parameter/Test Description QC Result QC Resutt True Value Orig Value Calc Result * Limits <br /> Gasotino Range Petroleum Hydrocarbons 1056 1000 0 22 103 50 150 <br /> MSD Matrix Spike Duplicate 09051202 _ 990877-5 05/22/7999 0255 <br /> Parameter/Test Description QC Result _ �QC Resutt True Value Orig Vatue CaLc Result * Limits <br /> Gasoline Range Petroleum Hydrocarbons 929 1056 1000 0 22 91 50 150 <br /> 12 8 30 <br /> ' Test Method EPA 8015Mod Batch 6381 Analyst —ed <br /> Y <br /> Method Description Total Volatile Petroleum hydrocarbons Units ug/L <br /> ' MS Matrix Spike 09051202 990877-5 05/22/1999 0230 <br /> Parameter/Test Description QC Result QC Result True Value 0rig Value Calc Result * Limits <br /> ' Gasoline Range Petroleum Hydrocarbons 1056 1000 0 22 103 _ 50 150 <br /> Page 30 <br /> * /_/ REC, R=RPD, A=ABS Diff D=/ Diff <br />