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00ft I 00ft <br /> 1 i <br /> Ground surface 2 0 1 <br /> I <br /> Portland cement . i Steel casing,16"dra <br /> � I , <br /> 245 <br /> ♦ <br /> 270 �� r ♦�.� <br /> Bentonite 285 I <br /> 1 <br /> y'y� is rr� <br /> Fine sand 290 <br /> (<0 25 mm) 1 <br /> T 300 <br /> 1 <br /> FrRerpack(1-3 mm) 1 <br /> i R <br /> 1 [EGOdoub[e-cased screen <br /> 366 <br /> 376 <br />' 8entonde Steel casing,16"dia <br /> 385 <br /> Fine sand 39 0 �`f~ <br /> (<0 25 mm) <br /> r w 400 <br /> I Irrigator screen <br /> Fillerpack(1-3 mm) _ <br /> 440 <br /> 460 Tight wind sump <br /> ' Open borehole diameter 24" <br /> Figure 3 UVB well diagram <br />