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Columbia Analytical Services <br /> -7- <br /> LABORATORY CONTROL SAMPLE <br /> Client: Shaw Environmental&Infrastructure,Inc. Service Request: L0600154 <br /> Project No.: 791288(Ground Water) <br /> Project Name: North County Landfill,San Joaquin County <br /> % Acceptance Analytical <br /> Analyte Units True Value Result C Recovery Qual Limits Date Time Method <br /> Sample ID: LCS060131W-1 <br /> Calcium ug/L 5000 5034 101 89.0-121.0 02/07/06 08:34 6010B <br /> Magnesium ug/L 5000 4943 99 87.0-117.0 02/07/06 08:34 6010B <br /> Potassium ug/L 20000 19873 99 83.0-121.0 02/07/06 08:34 6010B <br /> Sodium ug/L 25000 24382 98 85.0-122.0 02/07/06 08:34 6010B <br /> 43 <br /> 1 <br />