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1 <br /> fringe soils become accessible for treatment due to the drop in water levels as groundwater extraction <br /> progresses A down-hole electric or pneumatic pump draws VOC-laden water through a fluid intake <br /> hose to an above-ground treatment system <br /> The effectiveness of the groundwater pump and treat system will depend on the following site-specific <br /> parameters <br /> • Chemical composition of the contaminants, including vapor pressure, <br />' equilibrium partitioning characteristics, and liquid solubility factors, <br /> • Groundwater recharge rates, <br /> • Thickness and areal extent of fine-grained soils adsorbing the VOCs, <br /> • Removal rate of VOCs, and <br /> • Amount of VOCs requiring remediation <br /> 7 2 1 Well Installation Spacing <br />' Park's groundwater extraction feasibility testing of well MW-11 indicated a groundwater drawdown <br /> radius in excess of 100 feet from the extraction well Using this radius of influence minimum value, <br /> Park has designed a groundwater pump and treat system that will utilize MW-11 for all groundwater <br /> extraction activities at the Site A Site map showing the projected groundwater extraction radius of <br /> influence is included as Figure 19 <br /> t7 2 2 Pump Construction and Groundwater Treatment <br /> A pumping system powered either by electricity or pneumatic conveyance will be lowered to a depth <br /> of approximately 56 feet bgs(2 feet from the bottom of the 2-mch diameter well) The pump, capable <br /> of extracting greater than 4 gpm, typically has several hoses attached for pressurized air to run the <br />' pump, a hose for the exhaust air to exit the pump, and a hose for the fluid to be discharged from the <br /> pump An air filter is necessary to filter the ambient air to 5 microns All hoses with the system shall <br /> be of industrial grade <br /> The fluid discharge line carnes the extracted groundwater through filter vessels (carbon or another <br /> alternative treatment system selected by Thrifty) The treated water will be discharged under permit <br /> to the city sewer or the storm drain A process flow diagram for the groundwater extraction system <br /> is shown as Figure 20. <br /> Park's feasibility testing indicated that groundwater extraction rates from extraction well MW-1I <br /> were approximately 4 gpm Based on total groundwater flow rates of approximately 4 gpm and total <br /> 1 <br /> a.\1528J1 Asa 20 <br />