| Since 1997, Perteet has assisted the City of Snohomish with the development of a major 15-21 inch trunk sewer and lateral sanitary sewer collection system that serve newly annexed areas and locations within the city’s urban growth area.
We developed full build-out sewer flow rates, taking into account substantial sensitive areas and wetlands. Determination of future sewer flow rates was complicated by the potential construction of residential developments that allow clustered units and bonus densities. Alternative routes, facilities and pipe sizes were explored and developed for the sewer system. We also identified costs, connection fees and potential funding sources.
Wetlands crossing required more than 15 different permits and approvals, including the application of a Corps of Engineers nationwide permit, NEPA/SEPA documents, biological assessment, wetlands mapping and investigations, as well as wetland restoration and monitoring plans.
We also provided design and PS&E services to move a previously proposed sewer to fall within the Bickford Avenue ROW, to an alignment that follows a grade and alignment similar to Cemetery Creek. The relocated alignment is approximately 220 feet long. |
