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• <br /> my y <br /> TjW <br /> Roy F . Weston, Inc. - Stockton Laboratory <br /> Case Narrative <br /> Client: THORPE OIL <br /> RFW *: 11820 <br /> EXTRACTABLE PETROLEUM HYDROCARBONS <br /> 1 . This narrative covers the analysis of 17 samples in accordance <br /> with SW-846, method 8015-modified. <br /> 2. The analytical holding time for this analysis was met. <br /> 3. Initial and continuing calibration criteria were met for this <br /> analysis. <br /> 4. The method blank did not contain any interfering peaks at or above <br /> . the reporting limits. <br /> 5. Surrogates were not used in this analysis. <br /> 6. The blank spike recoveries and the RPD for the spikes were within <br /> the advisory limits, however both spikes contain petroleum hydro- <br /> carbon contamination which did not interfere with the spike recov- <br /> ery measurement. Reported results are based upon the spike con- <br /> centration only. <br /> 7. The matrix spike recoveries and the RPD for the spikes were within <br /> the advisory limits. <br /> 8. A diluted analysis was required for sample Northwall-18' because <br /> the extract was highly colored. <br /> D.D. Jenner Date <br /> Unit Leader <br /> • <br />