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Columbia Analytical Services <br /> -6- <br /> DUPLICATES <br /> Client: Shaw Environmental&Infrastructure,Inc. Service Request: L0600154 <br /> Project No.: 791288(Ground Water) Units: ug/L I <br /> Project Name: North County Landfill,San Joaquin County Basis: N/A <br /> Matrix: WATER %Solids: 0.0 <br /> Sample Name: Batch QCSD Lab Code: L0600136-OOlSD <br /> a Control <br /> Analyte Limit Sample(S) C Duplicate(D) C RPD Q Method <br /> Calcium 0-20 231148. 235646.2 1.9 6010B <br /> Magnesium 0-20 44647.0 43680.0--T- 2.2 6010B <br /> Potassium0-20 20232. 20011.6 1.1 6010B <br /> Sodium 0-20 82284.51 1 77057.9 1 6.6 6010B <br /> 1 <br /> 42 <br /> An empty field in the Control Limit column indicates the control limit is not applicable. <br /> Form VI-IN <br />