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E 18 <br /> Steel surface casing 4, 2-inch diameter, Schu 80 PVC wells to be installed <br /> 14 " OD in a single borehole. Two inch spacing to be maintained <br /> between wells and borehole. Grout to be sodium <br /> bentonite 30% solids pumped through Tremie pipe into <br /> 20' borehole. Sand to be #3 Monterey sand emplaced <br /> Conductor through Tremie. <br /> casing Concrete <br /> TOP VIEW <br /> Steel surface <br /> casing Concrete <br /> —50' —- Sodium <br /> Sodium ,' O ` <br /> O <br /> bentonite ' �� bentonite' grout <br /> grout ; <br /> x-12 - '/4' -- <br /> 2-inch <br /> diameter <br /> #3 Monterey Schd 80 PVC well <br /> sand �. <br /> 200' 2-inch spacing maintained between wells, surface <br /> casing and borehole. <br /> 9_7/$„ <br /> 400' Commercially available centralizers <br /> emplaced within sodium bentonite <br /> grout seal <br /> 600' Note: PVC wells will be installed under tension to hold <br /> them straight in the borehole. <br /> Proposed design for multiple-well site at Stockton East Water District, Stockton, California. <br />