1.5.5
The phasing of construction is permitted when in accordance with current land use codes, policies, conditions of preliminary approval, and SEPA conditions.
The site improvement plans for the initial phase of a project shall incorporate all conveyance, on-site stormwater management, flow control, water quality treatment, and erosion control BMPs necessary to serve the initial phase as if no further construction were to take place (i.e., a "stand alone" project).
It is of particular importance that runoff control facilities be designed so that stormwater release rates for each phase do not exceed allowable release rates for a given stage of "build-out." It will sometimes be necessary that the control structure be modified with each additional construction phase. With the addition of each phase of development, the project shall maintain its ability to "stand alone" without dependence on future phases of development.
In the event that the scope of the site improvement plans includes the entire project with all of its phases, the plans shall clearly indicate phasing limits for land clearing, erosion control, grading, construction of drainage facilities, and construction of impervious surfaces.