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Benefits: <br /> Eliminates the Pond i( <br /> Lost storage volume remains on site <br /> Non-Benefits <br /> Expensive <br /> Higher maintenance since sump manholes would need to be cleaned annually. <br /> Hard to clean system in the future if it fills with sediment. <br /> Option 6. Bury storage including no retention storage with sumps <br /> Remove existing storm sewer and raise the storm sewer which eliminates the need for sump <br /> manholes. <br /> Excavate the existing pond to native material. <br /> Replace the lost pond volume using large CMP culverts which allows the pond to be <br /> completely filled. <br /> With this option the existing ponding is eliminated by using Corrugated Metal Culverts (CMP). <br /> Enough CMP's are buried in the pond location to compensate for the lost storage. This will allow <br /> the site to be filled to near the elevation of the existing land. Some of the CMP should be <br /> perforated to take advantage of the natural infiltration of the soils. This eliminates the need for <br /> sump manholes by raising the storm sewers so the discharge elevation is above the invert of the <br /> outlet pipe in the highway ditch(904:58). For the most part the water quality function of the pond <br /> would be lost which may require a new pond offsite. <br /> Project Cost. $233,000 • <br /> Benefits: <br /> Eliminates the Pond <br /> Lost storage volume remains on site <br /> No sump manhole maintenance <br /> Non-Benefits <br /> Expensive <br /> Hard to clean system in the future if it fills with sediment. <br /> Option 7. New storm sewer <br /> Remove existing storm sewer and raise the storm sewer which allows the storm sewer to be <br /> jacked under Long Lake Road without disturbing existing utilities. <br /> Extend the existing south storm sewer to near the east entrance to the shopping center. <br /> Fill the existing pond l <br /> With this option the entire storm sewer is replaced and rerouted to a pond located in the northeast <br /> corner of Bronson Drive and Long Lake Road(Area EW-5 in the Local Water Management Plan). <br /> Due to utility conflicts in Long Lake Road, the existing storm sewer system would need to be <br /> raised. The option will eliminate the existing pond. This option does require offsite pond <br /> excavation to mitigate for the increase in water volume sent to the pond on the east side of Long <br /> Lake Road. The pond currently has a home which has little or no freeboard next to it. Lost water <br /> quality benefits would be mitigated in the pond. <br /> • <br /> 4 <br />