Laserfiche WebLink
2.2 OPERATION OF SUBSURFACE SOIL FLUSHING SYSTEM <br /> The operation of the pilot and full-scale flushing systems will require <br /> minimal operator attention. The injection water systems for the pilot and <br /> full-scale systems will be gravity fed from a temporary holding vessel and <br /> an existing tank, respectively. The supply of injection water for the <br /> Pilot system will be maintained by a float valve that will adjust the flow <br /> of city water to the temporary holding vessel . The supply of injection <br /> water stored in the full-scale injection water holding tank will be <br /> automatically maintained by a flow control system. When sufficient <br /> effluent flow exists in the existing effluent force main, the full-scale <br /> injection water holding tank will be refilled with treated effluent. If <br /> the effluent force main flow is insufficient, water from the city water <br /> service to the wood treatment building will automatically refill the full- <br /> scale injection water holding tank. <br /> Based upon estimates of hydraulic conductivity, the anticipated injection <br /> rates range from 0.2 to 5.2 gallons per minute (gpm) per well , with rates <br /> less than 1.0 gpm being more likely. During the pilot study, flow meters <br /> will be used to measure the total flow into the two injection wells and <br /> out of MW-206. MW-206 will be capable of pumping up to 8 gpm and will <br /> have a radius of influence greater than 100 feet. <br /> During full scale operation, the eleven injection wells will be injecting <br /> at an approximate combined rate of 11 gpm (57 gpm maximum) . EW-2 will be <br /> capable of extracting up to 50 gpm of water, with a radius of influence <br /> greater than 200 feet. Flow meters will be used to measure the total flow <br /> rate into the injection wells and out of MW-206 and EW-2. <br /> As discussed previously, the extracted water will be pumped to water <br /> treatment systems at MCTC' s facility. <br /> Specific operational aspects of the Phase II and Phase IV activities are <br /> discussed in the subsections below. <br /> 2.2. 1 Phase II Pilot Flushing System Operation <br /> The Phase II activities will be used to test the effectiveness of the <br /> flushing system and identify appropriate full-scale modifications. The <br /> pilot study activities at the site will be conducted for approximately two <br /> months. During this time, a specialized consultant, retained by MCTC, <br /> will monitor the water table elevation and the moisture content of the <br /> 11654.652 2-3 <br />