A. Purpose. The city experiences surcharging in the wastewater collection system and sanitary sewer overflows during wet weather events due to inflow and infiltration. The purpose of these regulations is to establish a methodology whereby new or intensified development in capacity constrained areas as established by the city council could offset new wastewater flow to mitigate capacity constraints in the existing wastewater collection system to accommodate the project’s additional demand. Without a reduction in inflow and infiltration in these areas, the city will not be able to serve new or intensified development until a significant number of private sewer laterals are replaced or public sewer mains are upsized.

B. Application. The provisions of this article shall apply to new or intensified development in capacity constrained areas of the wastewater collection system as established by the city council.

C. Calculating the Wastewater Flow Offset. An applicant shall calculate a development’s wastewater flow offset (Exhibit B) using the domestic sewage generation factors and peaking factor identified in the uniform design criteria, found in the city’s adopted engineering standards.

D. Wastewater Flow Offset through Private Lateral Replacement. The city determined that replacement of a private sewer lateral serving an existing single-family residence (one equivalent dwelling unit) would create a wastewater flow offset of three hundred ninety gallons per day. This is equal to the wastewater generation rate of a single-family residence (one hundred fifty gpd), at a peaking factor of 2.6.

E. Wastewater flow offset must occur within the same capacity constrained wastewater flow basin as the proposed new or intensified development.

F. Construction of off-site public sewer main improvements providing the equivalent or greater reduction in inflow and infiltration within the same capacity constrained wastewater flow basin may be allowed as an alternative to wastewater flow offsets (replacement of private sewer laterals) at the discretion of the utilities director. (Ord. 1704 § 19, 2021; Ord. 1665 § 3 (part), 2019)