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4 <br /> uvuCEq ttf[1ERfSpIXllA4 f <br /> ' ROY F WESTON, INC <br /> STOCKTON ANALYTICAL LABORATORY <br /> ' ANALYTICAL CASE NARRATIVE <br /> ' CIient• WESTON ECON/ EAST BAY MD <br /> RFW#• 9303S217 <br /> ' Test SW8015(MODIFIED)-TOTAL PURGEABLE PETROLEUM HYDROCARBONS <br /> ' 1 This narrative covers the analysis of five (5) water samples in accordance with the <br /> protocols based on The California Luft Manual. <br /> ' 2 The analytical hold time for this analysis was met <br /> 3 Continuing calibration criteria was met for this analysis <br /> 4 The method blank associated with these samples was free of target analyte <br /> interferences at, or above, the reporting limit <br /> 5 Surrogate recoveries were within Laboratory QC Limits except for MW-1(49%), <br /> MW-8(54%) and MW-7(58%), which could be due to matrix interference Re- <br /> analysis of these samples showed consistently low surrogate recoveries <br /> 6 Blank spike recovery was within Laboratory QC limits <br /> 7 Matrix spike analysis was not requested by the Ghent <br /> ' 8 Retention times were within acceptable Q C. limits <br /> 1 <br /> Unit Leader Date <br />