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r <br /> ' MJR Development <br /> c/o Northwest Developmeut Advisors LLC <br /> August 5, 2004 <br /> t Page 2 <br /> ' <br /> ' Access to thc underground vault will be via manholes located at the ends of the vault. A control <br /> structure will be located outside of the detention vault and will outlet to Catch Basins 7 and 8, <br /> then to the existing 24-inch storm drain located on 19`h Avenue Sout}:east. <br /> ' A pump will be installed in Catch Basin No. 7, immediately downstream from the restrictor <br /> manhole. This pump will convey stormwater from the 2-year storm to the water quality pond <br /> ' located on the east edge of the site 7'he maximum dischazge anticipated is one-half oi the pre- <br /> developed 2-year storm, or 0.03 cubic feet per second. Should the pump fail, the 2-y;ar storm <br /> � flow will overflow to Catch Basin No. 8 and th�m flow into the existing storm drair, system in <br /> 19'�' Avenue Southeast. <br /> I Plows in excess of the 2-year storm will out-fall directly to Catch Basin No. 8 and then to the <br /> existing drainage system in 19�' Avenue Southeast. <br /> I The pump will discharge into a 150-foot long vegetated treatment cell containing plantings at the <br /> bottom for nutrient control, which will be constructed at the east edge of the property. The <br /> volume of storage in this pond is 750 cubic feet, which is greater than 15 percent of the total <br /> Irequired dead storage (6-month developed storm) or 0.15 x 4,477=672 cubic feet. <br /> I Stormwater from thc water quality storm event will dischazge into a tworcartridge storm lilter <br /> manhole and finally discharge into the wetland. <br /> i <br /> I <br /> ( <br /> I <br /> I <br /> I U <br />