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OfiLAB CORE LABORATORIES Q U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 991123 Report Date 06/30/1999 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Shelby Lathrop QC Type Description Reag Code lab ID Dilution Factor Date Time Test Method EPA 8015Mod Batch 6979 Analyst evd Method Description Total Volatile Petroleum Hydrocarbons Units ug/L MB Method Blank 06/29/1999 1711 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F asoline Range Petroleum Hydrocarbons 6 i,CS L,aboratory Control Sample 09060803 96/29/1999 1737 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Gasoline Range Petroleum Hydrocarbons 1032 1000 0 103 2 50-150 LCD Laboratory Control Sample Duplicate 09060803 06/29/1999 1803 Parameter/Test Description QC Result QC Result True Value On g Value Calc Result * Limits F ine Range Petroleum Hydrocarbons 1051 1032 1000 0 105 1 50-150 1 8 30 MS Matrix Spike 09050803 991123-2 06/30/1999 0548 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F asoline Range Petroleum Hydrocarbons 817 1000 0 3 81 50-150 MSD Matrix Spike Duplicate 09060803 991123-2 06/30/1999 0615 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Gasoline Range Petroleum Hydrocarbons 776 817 1000 0 3 77 50-150 5 1 30 Test Method EPA 8015Mod Batch 6981 Analyst evd Method Description Total Volatile Petroleum Hydrocarbons Units ug/L CV Calibration Verification 09062503 06/29/1999 0145 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F asoline Range Petroleum Hydrocarbons 0 Page 12 * %=% REC, R=RPD, A=ABS Diff , D=% Diff ' me eeaaylwal resuba opnrona a imerpletalions cBnlainotl n m s sport a a bued upon nlgnlalron ape male ai suppen oy the denl to whasa a chis w and cml tlenual use Ina spat nes bean meas Yne enelylcaz reaugs op�w>m a mte gelag pna expresse4 lepleaenl Ilse Desi lutlpment pl Cqa Labq--Cqe Laborala es tpwTeee makes ne wdmdnlY a epaaanldl M e Ve99IX all plra6 OI dny type d�tl a pr0951y d 9clamla sante e9 le Ino preCWlnelly prOpb'Opeea[gn9 0 Maltapte e 5 01 any Oil ges COeI o piner m na a1 gppaly well p 9antl in conmelen vnln wnien sypn repprt 9 pse0 IX rel ee]ePpll lol anY eeeam wnalspeYar Tn9 apo 1 slug rpl pe rewdauea n wlgle d h peel wrtnWt lne w•Iian epp a al pl Co a Wtw alprres