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Kennedy/Jenks Consultants <br /> 8.4 Investigation-Derived Residuals <br /> For details of handling investigation-derived residuals refer to the project sampling and analysis <br /> plan. <br /> 8.5 Special Notes <br /> • To reduce the potential for cross-contamination, samples should be collected so that the least <br /> contaminated stations areas are sampled first. Subsequent sampling should be completed in <br /> the order of increasing contamination. Areas that typically have lower levels of contamination <br /> include those upgradient of source, background areas, and the periphery of the contaminated <br /> area. <br /> • Monitoring instruments that come into contact with sampled materials must be decontaminated, <br /> along with sampling devices. They should be washed, or at least rinsed before monitoring other <br /> sampling sites. <br /> 8.6 References <br /> U.S. Environmental Protection Agency. 1987. Handbook: Groundwater. U.S. Environmental <br /> Protection Agency, Office of Research and Development, Cincinnati, Ohio. <br /> Washington Department of Ecology. 1982. Methods for Obtaining Waste Samples. Ch. 173-303 <br /> WAC. Washington State Department of Ecology, Olympia, Washington. <br /> I <br /> f <br /> Monitoring Well Installation Work Plan SOG 8 <br /> Delicato Family Vineyards, Manteca, California Page 2 <br /> 9,UV pP ftkVWAD765001.00-dkaro%09.pf:lm.m left x pk?Wpwdixm8.wrod�.dx <br />