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i <br /> 1,T <br /> infiltration galleries or injection wells, <br /> described previously.) The mixture infiltrat(Oxygen <br /> gh can also be soil and added by sparging, as <br /> bacteria degrade organic compounds. Typically,sta ndwater where the <br /> groundwater extraction system is <br /> installed in order to control the groundwater gradient and recover the treated or <br /> partially treated groundwater. The recovered water is then recycled back to the <br /> ' infiltration gallery or injection well where nutrients are added. <br /> Process Dptionsfor Groundwater and Saturated Soils <br /> 16'Ionitorang'rYells, E fisting onsite monitoring wells will be sampled on an established <br /> schedule, such as quarterly or semiannually to gath <br /> f.' the groundwater and to evaluate the s er ongoing data about chemicals in <br /> effectivenesof any remedial actions taken. <br /> ExtmctieJu Wells. Groundwater can be removed from the subsurface by pumping from <br /> ' new wells.located <br /> within the contaminated area. The number, location,depth, and size <br /> of the wells can be selected to provide hydraulic gradient control, reducing <br /> preveslting downgradient migration of petroleum hydrocarbons. Pumping rates can be <br /> adjusted to compensate for changing water levels or to improve overall system <br /> Performance. Y <br /> At the Disco site, groundwater extraction is recommended for the area irntnediatel <br /> Y dow Igradient from the farmer tank pit. For the purposes of this analysis, it is assumed <br /> that.three wells would be installed and equipped with 4-inch-diameter submersible <br /> Pumps to capture the groundwater in this area. Additional wells can be added if <br /> needed. <br /> '�Parging. As described above sparging is a method of introducing air;o en into t <br /> he <br /> subsurface by the use of a air blower and an air injection well. The air injected below <br /> the water table will volatilize volatile petroleum compounds a <br /> ' biodegradation of petroleum compounds in the groundwater. and stimulate aerobic <br /> In situ Bioremediation. As described <br /> above, petroleum in <br /> groundwater can be reduced by stimulating microorganisms in theycarbons saturated zone. the <br /> Aar StriFping. Air stripping is an above-ground treatment technology used in <br /> conjunction with groundwater extraction to remove volatile compounds from water. A <br /> typical air stripper is a vertical, cylindrical column packed with plastic media. The <br /> untreated water is introduced at one end of the column and air is injected at the other <br /> end. As the water flows through the column, volatile compounds are transferred from <br /> the water to the air.. The off-gas from the air stripper would be treated with granular <br /> activated carbon before being discharged into the atmosphere. Air strippers are <br /> subject to scaling and clogging, particularly when treating hard water. Thus, an air <br /> stripper should be designed and costed to include cleaning and acid washes. <br /> SF031M4. 111'W07.51 <br /> 4-5 <br />