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In addition to the equalizer pipes shown, there are 12-inch overflow pipes in parallel with each of the <br /> equalizer pipes, except between lake 2 and lake 3, and between lake 4 and lake 5, for which there is no <br /> overflow pipe. The inverts of the overflow pipes are 1.5 feet above the normal lake water surface <br /> elevations3 for all of the overflow pipes in Phase 1 except for the overflow pipe between lake 9 and lake <br /> 7, for which the inverts are 2 feet above the normal lake water surface elevations. An example of these <br /> overflow pipes is also shown in Figure 2-2. As these structures are not yet designed for phase 2 lakes, <br /> the overflow pipes for phase 2 lakes are assumed to be 1.5 feet above the normal water surface elevation <br /> —same as for most of phase 1 lakes. <br /> 4'T GALV <br /> STEEL FRAME <br /> WATERMAN C-20 AND GRATE <br /> CANAL 304 STAINLESS STEEL GATE EL 9.0' <br /> 42"HIGH STEEL SAFETY 4'x4'x3"THK <br /> RAILING-3 SIDES CONC-PAD W <br /> 24"X 30"GALV. GRAVEL J 1 <br /> STEELGRATE 3 FG EL.92.0' <br /> RIP RAP ELEV. _ - - <br /> 8,p'T{Y-1.6't OVERFLOW �- OVERFLUW PIPE TO LA]iE 7 <br /> W.S.EL, INV_EL_7.0' <br /> 3'0 GALV STEEL <br /> GRATE W 2"t <br /> OPENINGS ---- - E* TO LAKE? <br /> ----- ' ' 3v,PIPE <br /> 36'PIPE 1 � <br /> INV-EL.0.50' <br /> J 1 .. .. ' N X 5'X 90.5 I{-I)PRECAST CQl�IC BOX <br /> 3 !NV_EL--0.50' - - - PER CONTRA COSTA COUNTY <br /> CONTRA COSTA COUNTY 5 x5� TYPE I III MH BASE INV.@-1.5t <br /> RIP RAP OUTFALL 1XTHICK GRAVEL BASE PER <br /> 36"PIPE TO DAYLIGHT GEOTECH REQUIREMENTS <br /> THROUGH RIP RAP <br /> LAKE 9 OUTFALL <br /> 36"0 PIPE @ INV. EL. 0.50' <br /> SCALE;1"=S' <br /> Figure 2-2: Typical Lake Outfall Structure for 36" Equalizer Pipes <br /> 3 Normal water surface elevation is at 5 feet. <br /> River Islands Phase 2 Stormwater Mitigation Rev 2 8 <br /> PACE <br />