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L. <br /> �.. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate#2480 Fax: (209)384-1507 <br /> Lr <br /> Geological Technics, Inc. Client Project ID:1298.2 Method:EPA 503018015M,8020 <br /> 1101 7th Street Client Project Name:Elving(Broadway) Instrument ID:Var-GC1 <br /> Modesto,CA 95354 Reference Number:8858 Extracted:01-09-06 <br /> �.• Attn: Ray Kablanow Sample Description:Water Analyzed:01-09-06 <br /> Analyst: Jim Phillips Reported:01-20-06 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration: 110 2.16 1.34 7.58 1.82 8.88 <br /> Units: uglL uglL uglL uglL uglL ug/L <br /> LCS Batch#: VW-1096 VW-1096 VW--1096 VW-1096 VW-1096 VW-1096 <br /> LCS%Recovery: 85.4% NA" 113% 109% 115% 113% <br /> Surrogate Recovery: 115% 112% 112% 112% 112% 112% <br /> Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> V <br /> MS/MSD Batch#: VW-1096 VW-1096 VW-1096 VW-1096 VW-1096 VW-1096 <br /> Spike Concentration: 110 2.16 1.34 7.58 1.82 8.88 <br /> MS% Recovery: 66.6% 85.8% 103% 98.3% 101% 100% <br /> Surrogate Recovery: 107% 106% 106% 106% 106% 106% <br /> MSD%Recovery: 79.2% 87.0% 104% 98.2% 103% 102% <br /> Surrogate Recovery: 110% 108% 108% 108% 108% 108% <br /> �... Relative%Difference: 13.1% 1.26% 1.18% 0.109% 2.38% 2.12% <br /> Method Blank: ND ND NO ND ND ND <br /> La Surrogate Recovery: 112% 113% 113% 113% 113% 113% <br /> *Recovea not calculated due to ca over. <br /> L" 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> APPROVED BY: <br /> Phi!lrps/L b r ctor or <br /> Clari J. Cone/Labo tory Manager <br />