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11.00 Mr. D.Lee Hedgepeth <br /> March 3, 2004 <br /> C A M B R I A <br /> 3. If pre-characterization suggests offsite disposal to a Class I facility then direct-loading <br /> should not be performed. Instead, additional sampling and segregation of stockpiles <br /> should be performed to minimize costs related to hazardous waste disposal. <br /> 4. Since groundwater may be located within 40 ft bgs, it is possible that groundwater has <br /> been affected by the release. Cambria recommends that concurrent with delineation of the <br /> vertical impact to vadose zone soil, groundwater samples be collected within the most <br /> affected area(s) of the Site and immediately downgradient. Cambria expects that grab <br /> groundwater sampling (using dual-tube direct push technology or other techniques to <br /> help prevent sample contamination by the overlying impacted soils) or temporary wells <br /> © would provide sufficiently accurate analytical results. <br /> 5. Sampling within 25 ft of the pipeline will require pot-holing to the pipeline at either end <br /> of the work area. After pot-holing two locations, the surface trace can be approximated <br /> with a chalk line or rope,and the pipeline should be clearly marked in the field. <br /> CLOSING <br /> Please call Bob Schultz at(510)420-3341 with any questions or comments. <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> Robert W. Schultz,R.G. <br /> Senior Project Geologist <br /> cc: Mr. Charles Spatafore,4720 S. Lammers Road,Tracy, California 95377 <br /> Mr. Bob Gondek, Chevron Pipe Line Company, 2811 Hayes Road, Houston, <br /> Texas 77082 <br /> Mr. Doug Heard,Kleinfelder,Inc.,2825 E.Myrtle Street,Stockton,California <br /> 95205 <br /> 1:\0-Chevron Pipe UneWmy KLM MP151.511trAl1ied030204-workplan w=entsAm <br />