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- <br /> F <br /> Golden Crain company <br /> ,lune 2, 1939 <br /> 202/799-5045.01 <br /> The st rvey <br /> will be conducted by driving a 5/8-inch diameter, <br /> hollow, stainless-steel probe into the ground and drawing a <br /> sample of soil vanor through the slotted drive point. immediate <br /> field analysis of the sail-vapor sample zSochromatogr.apt'ly in a <br /> e presence of <br /> volatile contaminants is performed e�roleum and halogenated <br /> mobile field trailer. Generally, P pressures <br /> hydrocarbons with )ow molecular weights and high vapor p •r <br /> are most readily detected by this method. <br /> Experience has shown that the presence of hydrocarbons in <br /> the soil vapor indicates that contamination exists in the soil <br /> and/or groundwater below the probe. Hydrocarbons are able to <br /> migrate from the groundwater and diffuse through the soils. Once <br /> ertically and horizontally <br /> in the soil pores, the gases diffuse v <br /> ipated into the atmosphere. soil-vapor <br /> until they ace diss <br /> is <br /> can therefore :�apiely delineate the <br /> sampling and on-site analys <br /> source and extent of contamination in the subsurface. <br /> The results of the soil-vapor survey will be used in <br /> 1 conjunction with previously generated data to select the lo- <br /> cations for the proposed borings. A meeting <br /> will be held between <br /> Golden Grain company, GTI, and the San Joaquin <br /> representatives of <br /> Local Health District to determine well locations and other <br /> details of further site characterization. <br /> 4.4 SOIL BORINGS AND MONITORING WELLS <br /> 4.4.1 Rationale <br /> Foar to seven borings will be drilled on and/or around the <br /> site. (Approval for off--site borings will be obtained prior to <br /> drilling.) Locations will be determined at the meeting mentioned <br /> 7 - - --- -- <br /> �r GROUNDWATER <br /> TECIINOLOGY.INC- <br />