2011 - 2016 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 improvements 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 30-inch forcemain for reliable 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
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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 well was difficult, creating a safety concern and inefficiency 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 30-inch pipe. A second 30-inch pipe also will be installed for reliability.
Project Schedule |
Authorizations |
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Start |
End |
Funding |
Status |
|
Prelim. Engr. |
Jan-03 | Feb-05 |
$900,000 |
Approved |
Design |
May-03 | Jul-10 |
$2,300,000 |
Approved |
Construction |
Apr-04 | Dec-12 |
$41,800,000 |
Approved |
Prior Authorization: |
$45,000,000 |
|||
2011 Budget Adjustment: |
$0 |
|||
Total 2011 Authorization: |
$45,000,000 |
|||
Future Authorizations: |
$0 |
|||
Total Project Cost: |
$45,000,000 |
|||
Authorized |
Future |
Total |
|
Prior to 2011 |
$25,165,000 |
$0 |
$25,165,000 |
2011 Budget |
16,000,000 |
0 |
16,000,000 |
2012 |
2,000,000 |
0 |
2,000,000 |
2013 |
0 |
0 |
0 |
2014 |
0 |
0 |
0 |
2015 |
0 |
0 |
0 |
2016 |
0 |
0 |
0 |
2017 - 2021 |
0 |
0 |
0 |
2022 - 2026 |
0 |
0 |
0 |
Contingency |
1,835,000 |
0 |
1,835,000 |
Totals |
$45,000,000 |
$0 |
$45,000,000 |
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.