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Figure 7. Completed sub-slab vapor probe <br /> (EPA). <br /> Op <br /> i <br /> cwnw �� <br /> mW <br /> .�.a ., �_r, Figure 8. Schematic illustration of sub- <br /> •Wa w aw T�r� \ I <br /> slab vapor sampling probes in a basement <br /> .m �... . (EPA). <br /> III. Soil vapor sampling <br /> The proper collection of soil vapor samples is a critical step in producing reliable <br /> concentration data. A number of factors are important in ensuring the reliability of the <br /> data; each is discussed below. Note that some regulatory agencies have specific <br /> guidelines for soil vapor collection. These guidelines should be followed in the design of <br /> a soil vapor collection plan. <br /> Prior to beginning a soil vapor sampling program, it is important to obtain the correct <br /> sampling equipment and to write a site-specific sampling plan. Written documentation of <br /> the equipment used and the sampling processes employed is critical. Consistency in <br /> equipment and sampling processes between probe locations and between multiple <br /> sampling events is important in order to minimize potential discrepancies in soil vapor <br /> ETC Soil Vapor Sampling Technical Toolkit 14 <br /> Version 1.4, September 7, 2005 <br />