Water Environment Services

The following best management practices are recommended to prevent water pollution at apartment complexes and multi-family housing units.

Report Spills 

Report spills and inappropriate discharges of wastewater into the storm system by calling WES: 503-742-4567. For significant hazardous material spills, call 9-1-1, and ask the dispatcher to notify WES.

Maintain Storm Drains 

Property owners are responsible for maintaining storm drains and stormwater facilities (swales, ponds, etc.) on their property. Clackamas County Water Environment Services (WES) Storm Drain Cleaning Assistance Program (SCAP) offers low-cost storm drain cleaning:  www.clackamas.us/wes/swm#stormdrain

Waste Management 

Uncovered solid waste, recyclables, and chemicals can be sources of stormwater pollution. Please cover or move these materials inside. Sweep and pick up additional debris instead of hosing or pressure washing pollution into the storm system.  

Pick Up Dog Waste 

Dog poop that is left on the ground can wash into storm drains and contaminate our streams and rivers. Please consider providing a dog waste bag dispenser with biodegradable bags to encourage tenants to pick up waste immediately and dispose of in a garbage can. 

Paints & Stains 

Store all chemicals in closed containers and clean up all spills immediately. Use ecofriendly paints and stains. Look for products that do not contain zinc, copper, or other pollutants, which enter the environment with stormwater runoff. Select safer choice products: www.epa.gov/saferchoice/products

Wash Vehicles Off-Site 

Stormwater systems in this area drain to the nearest creek or river. Please don’t wash vehicles in parking lots or streets. Encourage tenants to use a commercial car wash that recycles water and discharges to the sanitary sewer.

Stormwater Management 

To reduce the amount of pollution entering our rivers and streams, slow down your stormwater and allow for water infiltration into the soil. Go the extra mile: Install a rain garden or parking lot swale to infiltrate stormwater on-site. 

Avoid Zinc & Copper 

Treating moss with zinc and copper products creates runoff that is harmful to aquatic life. If using chemical controls, pick a safer product for people and the environment by visiting www.growsmartgrowsafe.org

Use Natural Controls to Manage Moss 

• Reduce shade by pruning branches 
• Use a stiff bristled brush or broom to remove moss 
• Correct acidity problems with lime after soil test 
• Correct drainage problems 
• Avoid pressure washing when possible
• Avoid powdered soaps during rainy season 
• If using chemical controls, disconnect downspout to retain roof runoff onsite

For more information and free technical assistance  Contact us at: 503-742-4567

• Owner – Clackamas Water Environment Services
• Design Engineer – Carollo Engineers
• Construction Manager – AKS

System Overview

Clackamas Area Interceptor Improvements Project (CAIIP) includes 5 miles of pipe and capacity upgrades which are needed at varying timeframes

Map showing the path of the entire interceptor project

Middle Interceptor Project Overview

• Approximately 12,400 linear feet of 42-inch to 48-inch fiberglass reinforced polymer mortar pipe (FRPMP)
• Project will have Fiberglass manholes
• Two sliplining segments (approx. 1,200 linear feet total)

Map showing the Middle Interceptor route, primarily down Highway 212

Two Force Main Connection Locations

Camp Withycombe connection

• New 4" and 15" PVC SDR35, 14" C900 PVC piping
• Abandonment of the existing Withycombe Pump Station

Diagram of the force main connection near Camp Withycombe

Clackamas Industrial Area

• 90 linear feet of 10" C900 PVC pipe

Diagram of the force main connection for the Clackamas Industrial Area

Highway 212 Traffic Control Requirements

• Approximately 9,200 linear feet of alignment within Highway 212 in ODOT Right of Way
• Alignment located in southernmost travel lane (eastbound travel lane)
• Days/Hours Allowed to Work: 8:00 PM to 5:00 AM each night (7 days a week). All lanes must be open from 5:00 AM to 8:00 PM.
• Minimum Lanes Open: Eastbound traffic reduced to one lane

Diagram illustrating two-lane and median closure

Diagram illustrating two-lane and median closure

Property Owner Coordination

• North Clackamas School District: Work must occur between July 1 and August 31
• Camp Withycombe: No work on Saturdays, Sundays, or federal holidays
• Fred Meyer: One departure lane and one inbound lane must always be open

Bids will be based on this information; Contractor can negotiate other arrangements with individual property owners once under contract

Entrance to Fred Meyer

Map showing locations of Camp Withycombe, North Clackamas School District, and Fred Meyer

Permitting

• WES in process of obtaining ODOT Utility Permit
• WES to apply for Clackamas County Utility Permit
• Additional permits needed (from the Contractor):
• Clackamas County Grading Permit
• Clackamas County Right of Way Permits (road closures)

Dewatering

Geotechnical Data Report in Appendix includes groundwater information

• Exploration ID  >  B-052
• Top of Borehole Elevation (feet) > 115.0
• Date of Groundwater Minimums and Maximums > 10/10/2023, 10/28/2023
• Depth of Groundwater (feet below ground surface) > 10.6, 9.1
• Elevation of Groundwater (feet) > 104.4, 105.9

Approximate depth of trench: 14' - 28'

Abandonment, Lateral Connections, & Bypass Pumping

• Approximately 2,300 linear feet of alignment is removed and replaced, 10,100 linear feet of alignment is installed parallel and abandoned existing interceptor.
• Existing service connections to interceptor to be reconnected or extended
• Anticipated flows in existing interceptor:
  • Dry Weather: 3.0 million gallons per day
  • Wet Weather: 10.0 million gallons per day

Diagram illustrating new interceptor and existing interceptor to be abandoned

Required Qualifications

• Bidder's proposed superintendent has supervised construction of at least 1 mile of 36-inch diameter or larger circular pipe sewer pipe in the last 10 years.
• The Bidder's proposed superintendent has supervised construction of at least one project with not less than 500 linear feet of fiberglass reinforced polymer mortar pipe.
• The Bidder has constructed at least one pipeline project with a total construction cost of $10,000,000 or more in the last 10 years or performed as a sub-contractor with a sub-contract cost of at least $10,000,000. To be considered a pipeline project, the pipeline construction cost must be at least half of the total construction cost.

Bidding Information

• Anticipated date of advertisement: May 2026
• Engineer's Estimate: $26.8 Million
• Project receiving State Revolving Fund funds
• No mandatory pre-bid conference, optional pre-bid conference to be held