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,� Report Number 12-202 Of Agenda Section VI-3 Council Meeting Date August 28,2012 $RIGS TON V Pond Overflow Pipe the city that works for you REQUEST FOR COUNCIL CONSIDERATION ITEM DESCRIPTION: ACCEPT QUOTE AND AWARD A CONTRACT FOR CITY PROJECT 12-11,27th AVENUE NW POND OVERFLOW PIPE. DEPARTMENT HEAD'S APPROVAL: Gova CITY MANAGER'S APPROVAL: No comments to supplement this re ort Comments attached Recommendation: Accept the quote award a contract for City Project 12-11, 27th Avenue NW Pond Overflow Pipe. Legislative History: This is in response to the July 16, 2011 rainfall event, where several areas within the City of New Brighton and surrounding communities experienced severe flooding. On June 15, 2012, all residents surrounding the west and east ponds were sent a notice of proposed project letter. On July 24, 2012 the City Council authorized the project. Financial Impact: 27th Avenue Pond Overflow $2,770 (Stepaniak Construction Quote) 27th Avenue Tree Removal $500 1568 26th Ave 4" drainline $2,170 1551 County Road H $2,214 $7,654 Explanation: Following the July 16, 2011 rainfall event the pond southwest of 27th Avenue NW Cul-de-sac flooded several backyards. The pond became inundated with runoff from the rain event, rising over 2.5 feet from the normal water level. This pond does not have a natural outlet or a man-made emergency overflow. As such, the water only receded several days later after the City pumped down the pond. To prevent this situation from re-occurring, the City is installing an overflow pipe that connects the west pond to the east pond. The overflow pipe will be installed in an existing drainage and utility easement located in the rear yard of 1571 27th Avenue NW. This overflow pipe would be set 3-inches higher than the west pond water level recently recorded on May 31, 2012. This pipe will act as an emergency overflow if the normal water level of the west pond is exceeded in a given rain event where the water will drain through the pipe to an overland swale to the east pond located southeast of the 27th Avenue NW Cul-de-sac. The property located at 1568 26th Avenue NW has a walkout step area that has a drain connected to the east pond. The City is working with the owner of this property to install a backflow prevention device on this line as the elevation of the drain is less than 1-foot above the elevation of the pond. With the limited space between the houses the contractor will rent specialized equipment to make this work possible. The rental will be at a weekly rate, and to take advantage of this we have included installing two yard drains at 1551 County Road H. With previous construction projects along County Road H, the City installed concrete sidewalk. This construction has isolated a small drainage area, and therefore standing water has created a nuisance situation in both winter and summer months.