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Roy F. Weston, Inc. - Stockton Laboratory <br /> Case Narrative <br /> Client: THORPE OIL <br /> RFW 4: 11820 <br /> FUMIGANTS <br /> 1 . This narrative covers the analysis of 17 samples in accordance <br /> with method EPA 504-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 target compounds or inter- <br /> fering peaks at or above the reporting limits. <br /> 5. Surrogates were not used in this analysis. <br /> 6. Blank spike recoveries and the RPD's for the blank spikes were <br /> within the advisory limits. <br /> 7. Matrix spike recoveries and the RPD's for the matrix spikes were <br /> within the advisory limits. <br /> A. All compounds reported positive were confirmed by second column <br /> analysis. Sample S.E.COR.-BTM-20' showed the presence of EDB <br /> below the reporting limit at an estimated concentration of 0.27 <br /> ug/kg. A diluted analysis was required for samples SOUTHWALL-13' , <br /> BTM-16'-SOUTH, NORTHWALL-13' and SPOIL PILE WEST N-2 because of <br /> the presence of background matrix peaks. <br /> D.D'.—Jenner Date <br /> Unit Leader <br /> i <br />