South Central Force Main Replacements

Project (A):  Central Valley/Fairgrounds
Project (B):  Techite Line Replacement
Project (C):  Solids Handling Upgrades at CKTP
Project (D):  Headworks Replacement at CKTP

Final Design Report and related documents for Projects A & B:
[All in Adobe Acrobat PDF format]

GeoTech Report
    Sections 1-12        818 KB
    Figures & Sheets  14.7 MB
    Appendix A           3.04 MB

Traffic Report
    Final Report    2.5 MB
    Appendix        7.6 MB

Wetlands and Stream Delineation Report
    Final Report   13.0 MB
    Appendix       14.4 MB

Project: Central Valley/Fairgrounds Force Main Work

The Central Valley/Fairgrounds force main work consists of replacing approximately 3,300 feet of 12-inch asbestos cement pipe that conveys sewage from Lift Station 34, north along Central Valley Road NW to the intersection of Holland Road, opposite Lift Station 5. Over the years, several leaks have occurred, including some instances of spills to Mosher Creek, located just south of Lift Station 34. The pipeline has been subjected to hydraulic pressure surges that may have contributed to the leakage problems.
Additionally, Lift Station 5, which is at the end of its design life, will be abandoned as part of this project and a 15-inch gravity sewer will be installed in the same trench as the new 12-inch line. This gravity sewer will convey flows from the LS-5 service area down to Lift Station 34. This will offset the need to upgrade LS-5 in the near future and remove one lift station from the operations and maintenance roster that the County maintains.

Finally, the project will also take advantage of the replacement of the 12-inch asbestos pipe to install a tight-line through, along Fairgrounds Road, to Lift Station 6. At present, the force mains from Lift Stations 5 and 34 converge in a manhole at the intersection of Central Valley Rd. and Fairgrounds Rd. The flow continues from this point in an 8-inch line. This restriction in the system has been a point of surcharging and subsequent odor problems which are likely to worsen as flow increases from the various service areas.

Schedule:
     Design complete:  March 15, 2009
     Bid and advertising: April 2009
     Construction:    May 2009 – November 2009

Budget
     Construction: $2.9 million
     (including engineering services during construction)

Project: Techite Line Replacement

The techite line replacement project consists of replacing approximately 6,500 feet of 30-inch Techite pipe beginning at the intersection of NE Paulson Road and Kelly Court NE, proceeding north along Kelly Court NE, crossing Madison Road, and terminating at the Central Kitsap Treatment Plant (CKTP). This force main is a critical leg of the conveyance network: it serves the entire southerly area of the South Central service area, which is comprised of over 22 square miles, conveying this flow of between 2,000 to 4,500 gpm to the Central Kitsap Treatment Plant.

The Techite line was installed in the late 1970s. Although it has not experienced problems to date, this particular type of pipe is known to be prone to failure. Techite pipe was manufactured in the 1970s using reinforced fiberglass. When compared to other flexible/plastic pressure pipe now being widely used – e.g. PVC or HDPE pipe – techite’s wall thickness is thin and this likely has contributed to the failures that have occurred throughout the United States. Because this force main is now on the order of 30 years old and situated in a major fault zone, it is of concern. The pipe is also situated near several creeks and a break could result in significant damage to local surface waters.

Schedule:
     Final Design March 2009
     Permitting and Easements April – October 2009
     Bid and Award November 2009
     Construction December 2009 – August 2010

Budget
     Final design and construction: $12.08

Project:  Solids Handling Upgrades at Central Kitsap Treatment Plant

The 1994 Kitsap County Wastewater Division Facilities Plan recommended upgrades to the solids handling process equipment at the Central Kitsap Treatment Plant. The original facility was constructed in 1975 and the existing process equipment is at capacity and at the end of its design life of approximately 30 years. In addition, by July 1, 2012 WAC 173-308-205 will be requiring more stringent removal of solids from the wastestream, necessitating replacement of the existing screening equipment at the plant. This project will bring the plant into compliance with the WAC, as well as enhancing operations and maintenance, emergency preparedness, capacity for existing flows, and effluent quality.
Additionally, the new solids digesters will be fitted with methane gas capture and reuse systems. The captured gas will be used to heat the process building, reducing energy usage at the treatment plant.
As regulatory and economic conditions allow, these improvements will form the basis for future phases of upgrades at CKTP for resource reuse and conservation including cogeneration of electrical energy, treatment of biosolids to Class A standards for compost and soil amendment, and water reclamation to irrigation/reuse standards, thereby reducing discharge into Puget Sound.

Project Elements:

• Headworks with influent flow measurement
• Grit and screenings removal facilities
• Primary clarifier effluent launder modification
• RAS mixing box
• Septage receiving station screen
• Anaerobic digester
• Modifications to existing digesters inc. gas management system

Schedule:
     Design: Jan. 2009 – April 2009
     Bidding and Award: May 2009
     Construction: June 2009 – November 2010

Project Budget
The project budget, inclusive of 30% for engineering and services during construction, is estimated at $ 47 million.

Central Kitsap Treatment Plant Headworks Replacement

The 1994 Kitsap County Wastewater Division Facilities Plan recommended upgrades to the solids handling process equipment at the Central Kitsap Treatment Plant. The original facility was constructed in 1975 and the existing process equipment is at capacity and at the end of its design life of approximately 30 years. In addition, by July 1, 2012 WAC 173-308-205 will be requiring more stringent removal of solids from the wastestream, necessitating replacement of the existing screening equipment at the plant. This project will consist of the replacement of the headworks structure and the screens at the septage receiving station, bringing this function of wastewater treatment at the plant in compliance with the requirement.

The headworks structure includes influent flow monitoring and measurement, grit removal, and screening. The new facility will also reduce odor at the headworks, which has been an intermittent problem to the neighborhood surrounding the treatment plant. The screens selected for installation at CKTP will be compatible with future water reclamation functions, should those be implemented.

Schedule:
     Design    January 2009 – March 2009
     Bidding and Award   April 2009
     Construction: May 2009 – December 2009

Project Budget
The project budget, inclusive of 30% for engineering and services during construction, is estimated at $ 19 million.

Staff Contact:  Barbara Zaroff P.E.,  360-337-5777

Kitsap County Public Works
Waste Water Division
(360) 337-5777 or (800) 825-4940
Kitsap1@co.kitsap.wa.us