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4_3 Subsurface Drainage Pipes <br /> All subsurface drainage pipes installed were of the type described in TR 02 and were installed <br /> with fabric wrap and filter rock as required. The central pipe (running longitudinal to the slope) <br /> in Zone 4 and Zone 3B outlets along the slope at a low point just uphill of the surface water <br /> control structures. Both outlets are clearly visible onsite (Figure 8).r <br /> :F- r � "' <br /> 5 <br /> ' s <br /> L_ <br /> , <br /> y .ri <br /> w f <br /> Ire <br /> e f <br /> I+ dI 3 SYwf r a. <br /> f � } <br /> i <br /> .y t <br /> f` <br /> Figure 8—Typical Outlet Pipe <br /> Ralston TR 03 15 Greg�k*i and Associates.P.I. <br />