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19 W111 8 1 DATE: 9/29/03 ITEM o.* vJIL 13. Department Approval: Manager Reviewed: Agenda wont Reports/Recommendations Item Description. Awarding Bids for Arona Pond Improvement Project; Phase I Background: Arena Pond is a wetland located north of Counter Road C and east of Snelling Avenue. Prior to development, Arona Pond was a land locked basin. For years the nonrial water level (NWL) of the pond was governed primarily by its infiltration qualities. As the surrounding area developed, the basin served as a storm water- basin. It serves a 112 acre subwatershed. An outlet was installed around 1 979. This enabled the basin to pass runoff from extreme rainfall events, although the NWL continued to be governed by infiltration. over the last decade, the NWL of the pond has risen; and the area of open grater- has steadily increased. It appears that the basin has been sealed and is no longer infiltrating as it once did. The resulting decrease of flood storage and lack of an effective outlet for the pond has led to the flooding of the parking lot and garages of the apartments northeast of the basin. In the City? s 2003 Comprehensive Stormwater Management plan, this subwatershed was identified as being a "problem area.} Since Arona Pond is located southeast of the Applewood Paint development, it was determined that this improvement should be undertaken at the same time as. the redevelopment of this site. This would enable the City to improve the capacity of the pond addressing the needs for the new development as well. Approvals for this project were included as part of the approval of the Applewood Point PUD. The Arona Pond. Improvement Project will increase the pond capacity, through the installation of a lift station, restoration of infiltration component of the basin, and expanding the size of the pond. The aesthetics of this basin will also be unproved through the removal of the ring of dead trees inside the shoreline of the pond. This project consists of two parts. The first phase is the excavation of the existing pond and installation of new outlet pipes. The second phase will be the construction of the lift station. Phase II bids will be opened at the end of October. Bids were solicited for Phase I during the month of September, with a bid opening on Wednesday, September 24, 2003, Policy Implications: Based on past practice, the City Council has awarded the contract to the lowest responsible bidder. In the case of Arona Pond Improvement Project, the apparent low bidder is Don Zappa and Son Excavating, Inc. of Blaine, Minnesota. Financial implications: The total proposed project cost for this improvement was estimated at $700,000. This includes both Phase I and Phase II, As described in the Applewood Point Development Contract, the total cost of the project would be split according to the contributing runoff volume. The contributing volume is split 13% DEVELOPER/ 7% CITY. Revised estimates place the total project cost closer to S600,000; $78,000 Developer cost/ $522,000 City storm water utility funds. The storrnwater utility fund, will be reimbursed for this project through future development contributions within this watershed and future captured tai, increment funds. Once Phase II bids have been opened we will be able to provide a final cost participation summary.