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cbCurtis &Tompkins,Ltd, <br /> MEMO <br /> RECEIVED <br /> Date: June 26, 2000 JUN 2 7 2000 <br /> To: David Dixon, T&R TREADWELL&ROLLO <br /> From: Steve Stanley, C&T <br /> RE: Stockton Redevelopment <br /> I have reviewed your memo of June 21, 2000 and have located and attached the missing <br /> pages to this memo. Listed below are the specific answers to your questions regarding <br /> the three sample delivery groups (SDGs). <br /> 145154 <br /> The paint contamination present in the TPH-Extractable analysis is limited to the two <br /> peaks observed at approximately the six to seven minute period on the chromatogram. I <br /> have attached a copy of the paint chromatogram showing these two peaks. This <br /> contamination was contained in glassware that was located in the kiln Curtis & Tompkins <br /> • (C&T) uses to bake organics from the glassware. The contamination entered into the <br /> glassware from an aerosol spray performed near the kiln over the weekend. The <br /> contamination was not observable at the time it occurred, but was recognized upon <br /> analysis of the extracts obtained from use of this glassware. Since the recommended <br /> hold time for sample extraction had been exceeded at the time of discovery, the suspect <br /> contamination was confirmed through re-analysis. <br /> The suspect paint contamination pattern appears on most of the samples from this SDG. <br /> Because there may be underlying and contributing peak area in the range where the <br /> suspect paint peaks occur, this area cannot be subtracted from the sample result obtained. <br /> The result may, however, be flagged (C&T uses a"Y") to indicate that the pattern does <br /> not resemble diesel. Additionally, a request was not made to treat the samples with silica <br /> gel that removes non-petroleum hydrocarbons. There may be peak area contribution <br /> from non-petroleum sources in these reported results. <br /> Finally, per your request, I am including copies of the chromatograms provided in the <br /> final report reprinted at a scale similar to the paint contamination chromatogram. <br /> 145268 <br /> Included in the attached pages are the sample results and method blank, as well as the run <br /> log for the samples (Page 4 of 6 in the run log). <br /> • <br />