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COU' LAB CORE LABORATORIES QUALITY CONTROL RESULTS Jab Number 990877 Report Date 05/31/1999 ' CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop QC Type Description Reag Code Lab ID DtLution Factor Date Time ' MSD Matrix Spike Duplicate 09051202 990877-5 05/22/1999 0255 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ' Gasoline Range Petroleum Hydrocarbons 929 1056 1000 0 22 91 50-150 12 8 30 ' MB Method Blank 05/22/1999 0505 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ' Gasoline Range Petroleum Hydrocarbons 3 LCS Laboratory Control Sample 09051202 05/22/1999 0531 Parameter/Test Description QC Result QC Result True Value Orig Value — Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 1079 1000 0 107 9 50-150 CD Laboratory Control Sample Duplicate 09051202 I 05/22/1999 0557 Parameter/Test Description QC Result QC Result True Value Orig Value CaLc Result * Limits ' ' Gasoline Range Petroleum Hydrocarbons 1120 1079 1000 0 112 0 50-150 3 7 30 Test MethodEPA 8015Mod Batch 6393 Analyst evd I-, � Method DesciptIan TotaL Volatile Petroleum Hydrocarbons Units ug/L — MB Method Blank 05/24/1999 1042 ' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 6 ' LCS Laboratory Control Sample 09051202 05/24/1999 1108 ' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 985 1000 0 98 5 50 150 LCD Laboratory Control Sample Duplicate 09051202 05/24/1999 1133 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons 1003 985 1000 0 100 3 50-150 ' 1 8 30 Page 31 * /=/ REC, R=RPD, A=ABS Diff D=/ Diff r