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<br />r-- <br />~o <br />'\1 <br />C' J <br /> <br />~~) <br /> <br />......'1 <br /> <br />The outlet pipe and butterfly valve interiors should be examined at <br /> <br />2-year intervals noting areas and extent of erosion and/or corrosion. <br /> <br />Reference chapter VI, page 19, of the DOC. <br /> <br />The 48-inch butterfly valves should be left at least 50 percent open <br /> <br />during winter shutdown to prevent icing on the gate leaves. <br /> <br />v <br />