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Two Rivers Gravel Pit Mine <br /> Riverside Berm Failure Analysis <br /> and Flood Control Mitigation Plan <br /> 7ech"olooicess January 22,2020 <br /> CENTRAL PIT <br /> aaeo.o <br /> FILL TIME VS HE.ADCUT <br /> 700 ft Berm <br /> Berm Crest <br /> 46U.p <br /> ardischergeexceeded 100%ofaffawableat <br /> 0.25 ho+us.) <br /> .0 <br /> a675.p <br /> C a574.0 <br /> —Best <br /> ' :.o Fill Time <br /> LU <br /> w_ <br /> d 46M.0 HeadcutwC stops. <br /> Length 145 ft.fiom pit bottwm., <br /> Rem length 1W ft at base. <br /> Pit Too <br /> M<0 0 <br /> 6 1 _ s 3 : 5 <br /> Time{hr) <br /> Figure 4 Central Pit <br /> Pit fill time and water surface elevation vs. head cut elevation for 100 ft riverside berm. <br /> pg. 17 <br />