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A Black & Veatch geological engineer or geologist will log the soil <br /> borings for the injection wells, neutron probe monitoring tubes, <br /> lysimeters, and the extraction well . Black & Veatch personnel and MCTC' s <br /> contractor will also collect soil samples and submit them for physical and <br /> chemical analyses as discussed in Section 3.2. 1. <br /> 2.1.2 Phase III Construction of Full-Scale Flushing System <br /> The full-scale flushing system will be constructed during Phase III <br /> activities at the site as shown on Figure 1-2 and will be modified as <br /> appropriate based on the results of the Phase II pilot study evaluation. <br /> The additional components of the subsurface soil flushing system to be <br /> installed during Phase III construction include: <br /> • Six vertical injection wells. <br /> (screened intervals from 20 feet to approximately 70 feet bls) <br /> • Three angled injection wells. <br /> (screened intervals from 20 feet to approximately 50 feet bls) <br /> • Six neutron probe monitoring tubes. <br /> (Installed to 20 feet below the ground water table encountered <br /> at the time of drilling. ) <br /> • One extraction well . <br /> (EW-2 will be 125 feet bls and screened 70 to 120 feet bls) <br /> • Injection water supply piping. <br /> (an existing tank will be used as an injection water holding <br /> tank) <br /> • Extracted water supply piping. <br /> (discharge to an existing tank used as an extracted water <br /> holding tank) <br /> The primary source for the full-scale injection water supply system will <br /> be the existing effluent force main from MCTC's water treatment systems. <br /> The secondary source of water for the full-scale system will be city <br /> water. The full-scale injection water supply system will be a gravity <br /> system that utii"izes an existing tank located adjacent to the retort pit. <br /> The full-scale extracted water piping system from MW-206 and EW-2 will <br /> discharge to another existing tank that is also located adjacent to the <br /> retort pit. Effluent from the extracted water holding tank will be piped <br /> to a high strength waste treatment system to be constructed under MCTC' s <br /> Contract No. 15. The tentative location for the high strength waste <br /> treatment system is shown on Figure 1-2. <br /> 11654.652 2-2 <br />