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6 1 2 Groundwater Extraction Pumping System The groundwater will be extracted from the five wells using the EconoPump multi-well het system (Appendix G) Basically this system uses a liquid-driven het pumping system Water is continuously circulated at relatively high pressure through multiple venturis to create a vacuum at each het inlet port in the Multi-Jet Manifold Buried 1-inch diameter PVC piping is used to extract the groundwater from each well and deliver it to the system The groundwater extraction point occurs at the depth the extraction piping "stinger" is installed within each extraction well ASE plans on installing the inlet piping stinger 5-inches from the bottom of each extraction well which will in effect de-water the zone The ' extraction piping will then "slurp" water continuously as water recharges back into the extraction well The likely extraction rate will b e approximately 2 gpm from each extraction well which will have an estimated radius of influence of no less than 20-feet This pumping rate will drop the water table within each extraction well no less that 3-feet The EconoPump system for this site has been designed to have t h e ' capability of extracting groundwater at rates up to approximately 4 gpm per well 6 1 3 Holding Tank and Level Swatches The extracted groundwater will then be delivered to a 500-gallon holding tank The holding tank will be wired with level switches to automatically drain the tank Switch number 1 will be a high-level switch that, when triggered, will activate a transfer pump to move the water from the holding tank into the activated carbon beds Switch number 2 will be a low-level switch that, when triggered, will turn off the transfer pump when the holding tank is nearly empty Switch number 3 will be a high- high level switch that will shut down the EconoPump if for some reason the holding tank transfer pump does not drain the holding tank All o f these pumps and switches will be wired to a central electronic control panel and operate automatically I6 1 4 Activated Carbon Vessels IWater leaving the holding tank will be pumped to three (3) 2,000-1b liquid-phase carbon adsorbers in series, each filled with an initial charge of 1200 mesh virgin coconut shell liquid-phase carbon Each vessel is designed for 100 minutes empty bed contact time (EBCT) or 11 lbs/day exhaust rate A sample port will be installed between each carbon vessel and dust prior to inlet into the sewer pipe to allow for determination of Frank's One Stop Interim Remediation System Workplan — September 2000 I -15-