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ROY F WESTON, INC <br /> STOCKTON ANALYTICAL LABORATORY <br /> ANALYTICAL CASE NARRATIVE <br /> Client SJCM + UCD - LODI <br /> RFW# 94075488 <br /> Test Pur eable Petroleum Hydrocarbons <br /> g Y <br /> 1 This narrative covers the analysis of eight (8) soil samples in accordance with <br /> protocols based on the California LUFT Manual <br /> 2 All required holding times for this analysis were met, with the exception of the <br /> reanalysis of sample SB2-20', which was re-extracted and reanalyzed one day out of <br /> hold due to a high concentration of petroleum hydrocarbons in the original analysis <br /> Both samples have been reported, however the results for the original analysis are <br /> not within the linear range of the 5 pt calibration curve for this analysis <br /> 3 All initial and continuing calibration standards associated with this data set were <br /> within acceptance criteria <br /> 4 The method blanks associated with this data set did not contain any target <br /> compounds at or above the reporting limits <br /> 5 Surrogate recoveries were within acceptance criteria, with the exception of sample <br /> SB2-20', which showed a high surrogate recovery due to background matrix <br /> interference from the high concentrations of petroleum hydrocarbons detected in the <br /> sample <br /> 6 Blank spike recoveries were within acceptance criteria <br /> 7 Matrix spikes were not performed on any of the samples in this data set <br /> S Confirmation by second column analysis was not required <br /> `%nq[- /_`r-�.SCG -� �2- <br /> Ka by N Schultz/Unit Leader Date <br />