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1 <br /> urnn aria va�naFa.a. �n e <br /> ROY F. WESTON, INC. <br /> STOCKTON ANALYTICAL LABORATORY <br />' ANALYTICAL CASE NARRATIVE <br /> I <br /> Client- SAN JOAQUIN COUNTY <br />' RFW#: 9304S564 <br /> Test: SW8015(MODIFIED)-TOTAL PURGEABLE PETROLEUM HYDROCARBONS <br /> I <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 /> I3. Continuing calibration criteria was met for this analysis. <br /> 4. The method blanks associated with these samples were free of target analyte <br /> interferences at, or above, the reporting limit. <br /> I5. Surrogate recoveries were within Laboratory Q.C. Limits with the exception of MW-8 <br /> (46%) and MW-8RE (55%) which was due to matrix interference. <br /> 6 Blank spike recoveries were within acceptable Q.C. Iituts. <br /> I7 Matrix spike were not requested for this batch of samples by this client. <br /> 8. Retention times were within acceptable Q.C. limits. <br /> ,27- <br /> Unit Leader Date <br />