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..x.aeAe ccer..wcansunxre <br /> ROY F. WESTON, INC. <br /> STOCKTON ANALYTICAL, LABORATORY <br /> ANALYTICAL CASE NARRATIVE <br /> Client: WESTON ECON/EBMUD <br /> RFW#: 9207S268 <br /> Test: SW8015(MODIFIED)-TOTAL PURGEABLE PETROLEUM HYDROCARBONS <br /> 1. This narrative covers the analysis of Sive (5j 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 blanks associated with this group of samples were free of target analyte <br /> interferences at, or above, the reporting limit. <br /> 5. Surrogate was not required for this analysis, but was added to help 8 q y p deterrrune purge <br /> efficiency. The surrogate concentration calculated in the blank was subtracted from <br /> all samples to yield the.final concentration. <br /> • F� <br /> 6. The blank spike recoveries were within acceptable Q.C. criteria. <br /> 7. Matrix spike and matrix spike duplicate recoveries were within Laboratory Q.C. <br /> f limits. <br /> 8. The matrix spike relative percent differences were within Laboratory Q.C. limits. <br /> 4 <br /> 9. Retention times were within Q.C. tolerance limits. <br /> Al <br /> Unit Leader Date <br /> I �* <br />