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iii CASTLE ANALYTICAL LABORATORY - <br /> Environmental Testing Services . .2333 Shuttle Drive, Atwater, CA 95301;x, Phone:. (209)384-2930 <br /> Certificate#2480 <br /> Fax: (209)384-1507 <br /> Geological Technics, Inc. Client Project ID: 1218.2 ;! Method:EPA 5030/8015M,8020 <br /> 1101 7th Street Client Project Name:Elving(Broadway)", ..Inst'rument ID:Var-GC1 <br /> Modesto;CA 95354 Reference Number:6858 Extacted:01-10-06 <br /> Attn: Ray Kablanow Matrix:Soil " Analyzed:01-10-06 <br /> Analyst: Clari Cone Reported:01-20-06 <br /> QUALITY CONTROL DATA-REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene" Ethyl Benzene Total Xylenes <br /> i <br /> Spike Concentration: 2.20 45.2 27.2 153 36.8 178 <br /> I Units: mg/kg ug/kg ug/kg ;t ug/kg ug/kg ug/kg <br /> LCS Batch#: VS-1106 VS-1106 VS-1106 o VS-1106 VS-1106 VS-1106 <br /> ,E <br /> LCS %Recovery: 87.2% 89.4% 110% �I' 104'1x'. 108% 106% <br /> Surrogate Recovery: 107% 106% 106% F 106% 106% lob% <br /> Control Limits: 70-130% 70-130 W . 70-130% 70-130% 70-130% 70-130% t <br /> MS/MSD Batch#: VS-1106 VS-.1106 " VS=1106 ;6 VS-1106 VS-1106 VS-1106 <br /> MS%Recovery: 63.5% 73.5%. 87.9% t ' 85.1% 87.20W 86.5% <br /> Surrogate Recovery: 87.3% 87.4% 87.4% 87.4% 87.4% 87.4% <br /> MSD%Recovery: 65.9% 53.3% 87.5% 86.0% 88.6% 88.0% <br /> Surrogate Recovery: 87.7% 86.6% 86.6% i 86.6% 86.6% 86.6% <br /> �r <br /> Relative%Difference: 3.53% 31,8% 0.412% 1,05% 1.51% 1.67% <br /> Method Blank: ND ND ND '' ND ND ND <br /> Surrogate Recovery: 111% 115% 115% ?i 115% 115% 115% 44 <br /> Please Note: <br /> The LCS(Laboratory Check Sample)is a control sample of known,interferent free.matrix that is fortified with representative analytes and <br /> analyzed using the same reagents,preparation and analytical methods employed for the samples. The LCS%recovery is used for validation <br /> of sample batch results. Due to matrix effects,the QC limits and recoveries for MS/MSD's a're advisory only and are not used to accept or <br /> reject batch results. <br /> J <br /> APPROVED BY: I� <br /> JaM s i ' tory Director or <br /> Cla'rf . Cone/Lab ratory Manager <br /> a <br /> i <br />