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Remove and Redrill Wells A numb r of the wells at the Lodi <br /> . I� <br /> site were completed such ,�that their gcreens or gravel packs span <br /> an aquitard and create effective artificial interconnections. <br /> t <br /> i <br /> These wells must be remoN4pd and redrilled before the hydrological <br /> properties of the contaminated aquif r at the site can be <br /> 6 <br /> I defined. Six wells must -'be removed, and five of those will be <br /> .6 <br /> �j <br /> redrilled. The wells to remove are RK-1, MW-14, MW-16, MW-17, MW- <br /> 18,and MW-21. Existing1well RW-1 will be removed and not <br /> replaced. Wells MW-14, MW-16, MW-17, MW-18, and MW-21 will be <br /> redrilled as specified iri the attatc ed table. <br /> I <br /> Wells should be removed using the most appropriate and cost <br /> F . <br /> effective technique, to be selected in advance in consultation <br /> } with Du Pont. After remdving casings and completion materials, <br /> the wells should be cleaned out and backfilled to the surface <br /> i� <br /> with a cement/bentonite r6ixture. <br /> After well RW-1 has beenjiremoved, a pump should be installed in <br /> i <br /> well MW-19 and tied into ��the on-site air stripper to maintain <br /> control of groundwater flow. MW-19 ' s currently a 4" diameter <br /> monitor well. After conversion it should be provided with a pump <br /> IF <br /> capabl upplying up to 2;0 GPM to th air stripper when water <br /> levels are high enough. 'Appropriate low level controls should be <br /> i <br /> installed to keep the pump from burning out. <br /> 7 . Wellhead Design. Install locking covers, and traffic rated <br /> boxes. Some wellheads will need ac ess pipes through the side of <br /> the box. An 8" clearance is needed over the top of the well cap. <br /> f 4 <br /> E <br /> f <br /> 5 I� <br />