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E <br /> I. H. KLEINFELDER &ASSOCIATES <br /> 3 VAPOR EX11RACTION SYSTEM DESIGN AND OPERATION <br /> 3.1 SYSTEM COMPONENTS <br /> The basic components comprising the vapor extraction system design are as <br /> follows: <br /> o An explosion-proof electrical motor/vacuum pump colnected to E <br /> wells in the vadose zone to induce air flow through the <br /> contaminated soil. <br /> o Extraction well, which allows the vacuum to be applied to the <br /> soil mass. <br /> i <br /> i� o Air inlet wells to allow atmospheric air to be drawn into the <br /> deeper soils, thereby facilitating extraction of deep <br /> contamination. <br /> IfF <br /> o Piping, manifolding, and valving connect the vacuum pump to the <br /> system wells and emissions control system, and allow control of <br /> the system. <br /> The pilot-scale vapor extraction system at Guild included four wells. The <br /> system was designed and installed to allow all of the wells to be operated <br /> as either extraction or air inlet wells. Additionally, the system was <br /> is <br /> operated without a carbon adsorption bed for the exhaust gas. A temporary <br /> discharge waiver was granted for this operation, while data were collected <br /> on the actual discharges. <br /> A__vapor-__extraction---extraction-well-(EX inlet piezometer wells (P-1, <br /> P-2, P-3) were constructed as shown on Plate 4. The vapor extraction well <br /> ,L .r and the air inlet piezometer wells were constructed in the same manner and <br /> 41-87--137 6 <br />