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1 A <br /> ROY F WESTON, INC <br /> STOCKTON ANALYTICAL LABORATORY <br />' ANALYTICAL CASE NARRATIVE <br /> I <br /> Client SAN JOAQUIN COUNTY HSA <br />' RFW#• 9310SO55 <br /> Test: PURGEABLE PETROLEUM HYDROCARBONS <br /> 1 <br /> 1 This narrative covers the analysis of seven (7) water samples in accordance with <br />' protocols based on The California Luft Manual. <br /> 2. The holding 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 Q C Limits No surrogate was added <br /> to the blank spike because the gas spike peaks interfere with the surrogate peak. <br />' 6 Blank spike recoveries were within acceptable Q C criteria. <br /> 7 Matrix spike analysis was not performed on any sample covered by this report. <br /> 1 <br /> 8. Second column analysis is not required. <br /> 1 <br /> 1 <br /> 1 <br /> Unit Leader/De nis D. Jenner Date <br />