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1 COULAB CORE LABORATORIES � Q LI A L I T Y C O N T R O L R E S U L T S ,fob Number 990877 Report Date 05/31/1999 1 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop QC Type Description Reag Code Lab ID Dilution Factor Date Time ' MS Spike 09051202 990879-1 05/24/1999 1834 matrix Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ' Gasoline Range Petroleum Hydrocarbons 792 1000 0 13 78 50-150 ' MSD Matrix Spike Duplicate 09051202 990879-171 05/24/1999 1900 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 796 792 1000 0 _ 13 78 50-150 ' 0 5 30 Test Method EPA 8015Mod Batch 6448 Analyst rvd ' Method Description Total Volatlle Petraleum Hydrocarbons Units ug/L —A MB Method Blank 05/26/1999 1000 Parameter/Test Description QC Result QC Result True Value 0 n g Valuc Calc. Result * Limits oLine Range Petroleum Hydrocarbons 2 ' LCS Laboratory Control Sample 09051202 05/26/1999 1052 Parameter/Test Description QC Result CC Result True Vatue Orig Value Calc Result * Limits ' Gasoline Range Petroleum Hydrocarbons 1056 1000 0 105 6 5D-150 LCD Laboratory Control Sample Duplicate 090512A2 05/.26/1999 1118 Parameter/Test Description QC Result QC Result True Value C n g Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 1058 1056 1000 0 105 B 50-150 0 2 30 1 MS Matrix Spike 09051202 990931 Z 05/27/1999 0044 Parameter/Test Description CC Result QC Result True Value Orig Value Calc Resutt * Limits 1 Gasoline Range Petroleum Hydrocarbons 1198 1000 0 24 117 50-150 i ' MSD Matrix Spike Duplicate 09051202 99f1931-2 05/27/1999 0110 Parameter/Test Description CC Resutt CC Result True Value Orig Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 1121 1198 1000 u 24 11G 50-150 ' 6 1 30 Page 32 * /,=% REC R=RPO, A=ABS Diff , D=% Diff