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Elk Creek Return Shaft <br />Existing Surface <br />3000 psi Concrete <br />HDPE Vent Pipe <br />Min. 2" Dia., 151 High <br />18 ) <br />`9 rebar on 6"x6" spacing <br />3"decking <br />W8x24 beam <br />DWG. 4 <br />