2008 - 2017 Capital Improvement Program

Project #8027, South St Paul LS/FM Improvements

Description:

The project updated the existing lift station. Converted from a former Wastewater Treatment Plant (WWTP) in 1986, the lift station still was utilizing some of the old equipment from the WWTP. Completed in 2006, the project included the replacement of the screen handling facilities; electrical equipment; pumps and motors; odor control; standby power; and improvement to wet well access and to the secondary building. The project also includes the replacement of the existing 48-inch-diameter forcemain with a dual forcemain for reliability of conveyance to the Metropolitan WWTP. This forcemain portion of the project includes river crossing and conveyance through the Metropolitan WWTP to the plant headworks.

Project Map

Purpose and Justification:

The South St Paul lift station L-65 was converted from a former Wastewater Treatment Plant (WWTP) in 1986. The lift station has undergone a few renovations since that time. However, some of the old parts from the WWTP were still in use at the lift station. Most of the lift station components were 30 years old and were in poor condition. The bar screens were old and in very poor condition having been patched and rebuilt numerous times. The electrical panels were mainly from the WWTP and because of their age many of the parts were no longer made, causing problems for maintenance. The back-up power supply, both the primary and secondary were in need of major renovation and had a history of failure. The access to the wet was in a compromising location that was difficult to enter, creating a safety concern and nuisance for workers. Also, the site was a source of occasional odor complaints.

Construction activities associated with the Wakota Bridge project revealed that the existing 48" forcemain was more severely deteriorated then previous inspections had revealed. The forcemain is composed of prestressed concrete cylinder pipe with the Interpace Class IV wire that is prone to hydrogen embrittlement. Pipe exposed as part of MNDOT's Wakota Bridge project exhibited cracks in the protective cement mortar coating, delaminated protective cement mortar coating, and corroded and broken prestressed wires. This compromises the integrity of the forcemain. The 48-inch-diameter pipe will be replaced with a more appropriately sized 36-inch pipe. A second 36-inch pipe also will be installed for reliability.

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Project Authorization:

	Project Schedule		Authorizations
	Start	End	Funding	Status
Prelim. Engr.	Jan-03	Feb-05	$900,000	Approved
Design	May-03	Jul-06	$2,300,000	Approved
Construction	Apr-04	Dec-10	$41,800,000	Approved
Prior Authorization:			$45,000,000
2008 Budget Adjustment:			$0
Total 2008 Authorization:			$45,000,000
Future Authorizations:			$0
Total Project Cost:			$45,000,000

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Projected Cash Flow:

	Authorized	Future	Total
Prior to 2008	$8,908,000	$0	$8,908,000
2008 Budget	15,000,000	0	15,000,000
2009	15,000,000	0	15,000,000
2010	6,000,000	0	6,000,000
2011	0	0	0
2012	0	0	0
2013	0	0	0
2014	0	0	0
2015	0	0	0
2016	0	0	0
2017	0	0	0
Post-2017	0	0	0
Contingency	92,000	0	92,000
Totals	$45,000,000	$0	$45,000,000

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Impact on O&M Costs:

Expect that the overall yearly O/M effort will remain the same. The pumps, electrical, instrumentation and controls should require less maintenance. However, there will be some additional effort for maintaining a standby generator and the biofilter.

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Metropolitan Council

2008 - 2017 Capital Improvement Program