PEN 1 projects

	Capital Projects for PEN 1

	Completed Projects:

	Northern/Midwestern Slough Culvert Replacement - In the summer of 2006 the District replaced a single corrugated metal culvert connecting the Northern Slough to the Midwestern Slough to the Midwestern slough with two 36' plastic pipes at a lower grade to improve the flow between the two sloughs. The $35,000 project was accomplished using the District's engineer, crew and equipment. A surprise for the project was finding an underground sewer main that neither the City of Portland nor the Drainage District knew existed.

	Culvert Replacement on the South End of Northern Slough - The District replaces a deteriorated 30" metal culvert under the PIR access road to the interior of the track with a 48" HDPE and lowered the invert of the culvert to improve the flow in the Northern Slough and stabilize an eroding bank on both sides of the culvert, project cost $16,500.

	Culvert Repair on Forebay Slough - The District replaced a 2 foot section of a metal culvert at the northeast end of the forebay slough because of deterioration and bank erosion, project cost $22,000.

	Tree Removal on the N Marine Levee - In 2009 the USACE identified 40 trees at the toe of the N Marine Dr. levee and flood wall that were in violation of the Federal Levee design and vegetation standards and required the trees and root wads to be removed. In 2010 the District removed the trees and root wads under a City of Portland permit and agreed to mitigate for the tree removal, project cost $17,500. The district entered into an IGA with the City of Portland BES to plant and maintain the trees along Broadacre Street for $23,000.

	Tree Removal on the Railroad Levee Embankment - In 2009 the USACE identified 60 trees on the levee slope that were in violation of the Federal Levee design and vegetation standards and required the trees and root wads to be removed. In 2010 the District removed the trees and root wads, project cost $20,000.

	On Going Projects:

	Portland International Raceway (PIR) Pump Station - The PIR Pump Station was built in the 1940's, the support pilings are deteriorating and the pumps and motors are severely outdated. The primary concern at this time is the current design does not protect existing wet wells against the intrusion of large or small debris. The Pump Station and adjacent levee has had geotechnical evaluations completed as a part of the conceptual design to estimate a cost to build a new pump station. A new Pump Station will cost an estimate of $1.25 million, the District does not have those types of funds so the Board decided to address the immediate concern and retrofit the existing pump station with trash grates to protect the pumps from debris entering the wet wells and damaging the pumps. The Board will be exploring ways to fund a new pump station in the future.

	Future:

	Vanport Wetlands Pump Station - The Pump Station was built in the 1940's, the support pilings are deteriorating and the pump and motor is severely outdated. The Pump Station is owned by the Port of Portland, and managed by the Drainage District. The Port of Portland and Drainage District is working together to relocate the Pump Station and design the pumps station to be underground. The project cost is estimated at $600,000.

	Levee Seepage Investigation - During a high river levee when the levees become saturated the District will use some form of infrared or ground penetration radar to detect areas in the levee that are abnormally saturated or identify potential conduits for high level seepage of boils.

	Investigate Levee toe Drains - Majority of the levee systems have a toe drainage system which drains the water away from the levee during high river levels so the levee does not become overly saturated at the base of the levee. Over time the toe drainage system may become plugged or damaged. The investigation will identify any deficiencies that need to be corrected.

	Lower Columbia Slough Levee Improvement - The District is performing a slope stability analysis along the lower Columbia Slough levees to be repaired or rebuilt to meet USACE levee design standards.

	Trash Raking Systems for Pump Stations - As water quality improve in our ditch system the aquatic weed becomes an increasing issue with plugging the intakes to the pump stations. In order to prevent the pumps from cycling continuously because of the weed build up, the district has designed a trash raking system to remove the weed from the grate automatically. The trash raking system cost between $90,000 and $130,000 per pump station. As soon as the district can budget for the improvement of the trash raking systems they will be installed.

	Coordinate with Utilities to get a Secondary power grid to Pump Stations - The District is working with the electrical utilities to install a secondary power source from a secondary sub-station to all of our pump stations to establish a redundant and reliable power source to the pump stations.