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Alisto Engineering Group <br /> 3732 Mt. Diablo Blvd., Suite 270 <br /> Lafayette, CA 94549 <br /> Blank I QC Data Date(s)Analyzed: 07/09/02 <br /> Proj. ID: 10-211-15-002 07/10/02 <br /> Site: McDonald Island Method:8015M/8020A <br /> Lab ID: BLKC0709 BLKC0710 <br /> Sample I D: Blank Blank <br /> Matrix: Water Water <br /> Total Petroleum Hydrocarbons <br /> @ Gasoline <50 <50 <br /> Benzene <0.5 <0.5 <br /> Toluene <0.5 <0.5 <br /> Xylenes <1.0 <1.0 <br /> Ethyl Benzene <0.5 <0.5 <br /> QA/QC: <br /> Surrogate Spike Recovery: 97% 100% <br /> TriFluorotoluene <br /> Matrix Spike Recovery Summary <br /> Percent Recovery <br /> Lab ID Client ID Analyte MS/MSD %RPD <br /> C07047 SB-9-3 Benzene 74 / 74 0 <br /> C07061 SB-10 Toluene 92 / 92 0 <br /> Laboratory Control Spike <br /> Lab ID Analyte Percent Recovery <br /> LCS0709D Gas 109 <br /> LCS0710D Gas 110 <br /> Note:Water samples are reported in q&,soil and sludge samples in mg/kg. <br />