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PART 400 - 600 Minimum Requirements.
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When minimum requirement 1 applies pursuant to part 300 of this chapter, the applicant shall prepare a stormwater site plan.

(1) A stormwater site plan is a comprehensive report containing all of the technical information and analysis necessary for the evaluation of a proposed new development or redevelopment project for compliance with the requirements of this chapter.

(2) Prior to any land disturbing activity, the applicant shall submit a stormwater site plan that complies with this section and volume I, chapter 3 of the Drainage Manual. Volumes I through V of the Drainage Manual shall be used to select BMPs. The required procedures for preparing a stormwater pollution prevention plan (SWPPP), a part of the stormwater site plan, and the required content of the SWPPP are described in SCC 30.63A.445, 30.63A.450, and volume II, chapter 3 of the Drainage Manual.

(3) The following types of stormwater site planning work shall be performed by or under the direction of a professional engineer licensed in Washington State:

(a) Stormwater site plans that involve engineering calculations;

(b) Plans involving construction of treatment facilities or flow control facilities (detention ponds, bioretention or infiltration basins, etc.);

(c) Structural source control BMPs; and

(d) On-site drainage conveyance systems. (Added by Amended Ord. 10-026, June 9, 2010, Eff date Sept. 30, 2010; Amended by Ord. 15-102, Jan. 11, 2016, Eff date Jan. 22, 2016).