The methodology of the sewer collection system development charge (SCSDC) is based on future capacity-increasing capital improvements as identified in the City’s Capital Improvement Plan for the Sanitary Sewer Collection System Development Charge Fund, and on planning criteria as identified in the most recent report entitled “Sanitary Sewer Collection System Master Plan.” The SDC eligible project list is available for review through Public Works Engineering.

The current design criteria utilized by the Regional Wastewater Treatment Plant in the determination of equivalent residential units (ERUs) and as specified in the engineering report is 350 gallons/day/ERU average dry weather flow (ADWF). This same design criterion of 350 gallons/day/ERU will be utilized in the determination of the ERUs for the sanitary sewer collection system.

The projected cost of future system modifications shall be determined on the basis of the capital improvements identified in the “Sanitary Sewer Collection System Master Plan.” The future system modifications required to serve growth will be adjusted to current dollars and divided by the number of ERUs for which these improvements will provide service.

The future costs of compliance with Oregon law in the determination of SDCs shall include the estimated cost of engineering, legal, planning, administrative and accounting services. Compliance costs per ERU shall be determined on the basis of projected population growth.

The calculations shall be done on a city-wide basis so that the charge reflects the cost per ERU throughout the City.

The charge for future system modification and compliance costs shall be designated an improvement fee.