(1) All drainage and erosion control plans shall be prepared by an engineer licensed in the state of Washington in compliance with the city of Electric City development standards manual (as it exists or hereinafter amended). Upon the city’s review and approval of the drainage and erosion control plans, the identified measures to prevent contaminated stormwater from being discharged off the construction site must be in place prior to any clearing, grading or construction.

(2) All drainage and erosion control plans shall address methods to minimize and contain soil within the project boundaries during construction and to provide for stormwater drainage from the site and its surroundings during and after construction. Best management practices (BMPs) must be used to prevent any sediment, oil, gas, pesticide-contaminated soil or other pollutants from entering surface or groundwater.

(3) All drainage and erosion control plans shall be prepared using the Type 2 SCS model (see city of Electric City development standards), taking into account a storm event equal to or exceeding two inches of rainfall in 90 minutes. (Ord. 563 § 1, 2019)