5.1. - 5.5. SR 02-009-1998 - Laserfiche WebLink

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December 18, 1997 Mr. Steve Ach Page Throe De Grading 1. ualtty 1. and Drainage Plan The drainage calculations that were supplied adequately address both the quality and quantity issues and are therefore acceptable. It appears that the emergency overflow from the catch basins, located along the northern street alignment, would be through the townhouse parking area, over the curb, and to Lake Orono. This emergency overflow is adequate, however, the City ordinance requires the adjacent housing unit to have their lowest floor set at an elevation that would be 1-foot above the emergency overflow. The emergency overflow elevation should be clearly marked on the plan and the adjacent housing unit should be set 1 foot above. We assume that the City will be responsible for maintenance of the storm water pond relative to the operation of the storm sewer system. However, Guardian Angels should maintain ownership of the land that the pond sits on, and be responsible for routine maintenance such as; grass cutting and litter pick-up. Thereforel it may be better if this area is not platted as an outlot so there is no risk that in the future it will go tax forfeit and have to be picked up by the City due to the storm water ponds. Plan Sanitary Sewer service is provided to the site by extending an 8-inch gravity sanitary sewer from the manhole located in Joplin Street at the access point to the site. Gravity sanitary sewer then is extended northerly and easterly to provide access to all of the units. It appears that the sanitary sewer may need to be extended slightly to provide access to each of the townhouse units. Watermain is shown as a 6-inch line looped through the site. At the staff review meeting, it was discussed that an 8-inch loop would be required on the most southerly road system and to the southeast corner of the property. Revisions should be included in the internal water system for future looping of the water system, at the northwesterly corner of the property where it abuts the Hartman parcel and at the southeastern comer of the property where it abuts the Elk Motel entrance. An additional hydrant should be installed along the northerly route at approximately the mid-point between the two hydrants that are shown. There will also need to be a hydrant provided on the southern part of the commercial building. In fact, there is a watermain stub off of the Joplin Street watermain at approximately this location that could be used to extend into the site for the placement of this hydrant. At the staff., review meeting the issue of fire flow at this: development was discussed relative to whether or not the watermain needs to be looped. After the staff review meeting, Bryan Adams from the Elk River Municipal Utilities did a flow test on one of the hydrants and determined that currently the flow is approximately 2,500 gallons per minute. We also plugged in this development to Howard R. Green Company GONSULTING ENGINEERS