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1 <br /> ROY F WESTON, INC <br /> 16 STOCKrON ANALYTICAL LABORATORY <br />' ANALYTICAL CASE NARRATIVE <br />' Client SAN JOAQUIN MOSQUITO <br /> RFW # 9407S668 <br /> TOTAL EXTRACTABLE HYDROCARBONS <br />' 1 This narrative covers the analysis of ten (10) samples in accordance with protocols <br /> based on California LUFT Manual-Modified, October 1989 <br />' ? The analytical holdirg, time for this analysis was met <br />' 3 Initial and continuint; calibration criteria were met by the standards associated with <br /> the tramples covered nv this report <br />' 4 The method blanks associated with these samples did not contain any target <br /> compounds at or above the reporting limit <br /> S Surrogate recoveries were within ,advisory limits <br /> 6 The recoveries for the blank spikes were within advisory limits The RPD for the <br />' blank spikes was within advisory limits <br /> 7 The recoveries for th� matrix spikes were within advisory limits The RPD for the <br />' spikes were out side of advisory limits This is attributed to the level of hydrocarbons <br /> in the native sample and to matrix varibility <br /> 1 <br /> L/ <br /> Dale E Gimble/Unit Leader Date <br /> I <br />