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L ll <br /> A ' <br /> �1. NIAGEPS LE WIEF]Kp19LlfexiS <br /> ROY F. WESTON, INC. <br /> STOCKTON ANALYTICAL LABORATORY <br /> ANALYTICAL CASE NARRATIVE <br /> Client: WESTON ECON/EBMUD <br /> RFW#: 9207S268 <br /> Test: SW8020 PURGEABLE.AROMATICS <br /> 1. This narrative covers the analysis of seven (7) water samples in accordance <br /> with <br /> protocols based on SW-846, method 8020. <br /> 2. The analytical holding;;time for this analysis was.met. <br /> 3. Continuing calibration'criteria was within Laboratory QC limits with the exception <br /> of Benzene (17%) in the first standard. <br /> i <br /> 4. The method blank associated with these samples did not contain any target analytes <br /> at, or above, the reporting limits. <br /> Ir 5. recoveries Surrogate g o eves were within Laboratory QC limits with the exceptions of <br /> samples # MW-1 (62%) and MW-8 (52%) possibly due to matrix interferences. <br /> y <br /> 6. .Blank spike recoveries,'were within Laboratory QC limits. <br /> 7. Matrix spike and matrix spike duplicate recoveries were not within Laboratory QC <br /> limits possibly due to matrix interferences. <br /> 8. The matrix spike relative percent differences were within Laboratory QC limits. <br /> 9. Retention times were within QC tolerance limits. <br /> I� <br /> t <br /> Unit Leader Date <br /> h_ _ 1 <br />