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• Section No 6 <br /> Revision No 0 <br /> Date September 5, 1991 <br /> Page 2 of 55 <br /> ■ types of field measurements and sample screening procedures; <br /> • well installation and developing methodology, as appropriate, <br /> • decontamination procedures, if not consistent with QAPP procedures, <br /> ■ disposal of drill cuttings, development and decontamination water, <br /> ■ time schedule for completion of work <br /> Sampling activities for this project are varied and correspondingly <br /> require a variety of sampling methods Outlined in this section are <br /> procedures to be followed for the collection of soil vapor, air, water, and <br /> soil samples in a variety of environmental settings <br /> As required, additional sections will be added to the QAPP in the future <br /> to describe sampling methodologies referenced in future sampling and analysis <br /> plans <br /> 6 2 Soil Vapor Sam lin <br /> On-site analysis of volatile organic compounds VOCs is increasingly <br /> important to environmental assessments The ability to perform real-time <br /> chemical analysis during investigations of potentially contaminated soils <br /> allows field decisions to be made regarding the depth and areal extent of the <br /> investigation <br /> The applications of on-site VOC analysis include evaluation of <br /> subsurface spills and leaking tanks, evaluation of VOC emissions from <br /> landfills, contaminated soils, and industrial facilities, and identification <br /> and definition of the vertical and areal extent of groundwater VOC plumes <br /> • Because VOC's are readily transported in soils by diffusive and <br /> adjective processes, soil gas surveys have proved to be a powerful technique <br /> 6-2 <br />