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Engineer in accordance with the guidelines in Section 2.1.5 of the SWMMEW. Exemptions or exceptions to <br />the requirements in the SWMMEW within the NPDES Phase II boundary and not specifically allowed by the <br />SWMMEW shall be subject to approval by the Washington State Department of Ecology. <br />12.04.05.060 General Stormwater Requirements. <br />The following requirements shall be implemented in accordance with the SWMMEW: <br />A. Core Element No. 1. Stormwater Site Plan. A stormwater site plan shall be prepared in accordance <br />with SWMMEW Chapter 3 and submitted for review and approval by the County Engineer or <br />designee prior to issuance of a grading permit, building permit, final plat approval, or other County <br />permit as applicable. See KCC 12.04.05.070 for stormwater site plan submittal requirements for <br />subdivision projects. The Stormwater Site Plan will be reviewed using the Department's <br />construction plan review procedures in coordination with all other County development and/or <br />permit review procedures. The County's review and approval of the Stormwater Site Plan shall not <br />relieve the applicant, developer, owner and/or designer of liability for errors or omissions in the <br />design of storm drainage facilities. <br />B. Core Element No. 2: Construction Stormwater Pollution Prevention. Prepare and maintain a <br />construction stormwater pollution prevention plan on site during the entire project and amend as <br />necessary. <br />C. Core Element No. 3: Source Control of Pollution. Apply all known, available and reasonable source <br />control BMPs. Operational and structural source control BMPs shall be selected, designed and <br />maintained according to the SWMMEW. <br />D. Core Element No. 4: Preservation of Natural Drainage Systems. Preserve natural drainage systems <br />to the extent possible at the site. <br />E. Core Element No. 5: Runoff Treatment. Projects that result in five thousand square feet or more of <br />new pollutant -generating impervious surfaces shall design, size, construct, operate and maintain <br />runoff treatment at the site. <br />F Core Element No. 6: Flow Control. Projects that result in ten thousand square feet or more of new <br />impervious surfaces shall design, size, construct, operate and maintain Stormwater flow control <br />facilities at the site. <br />G. Core Element No. 7: Operation and Maintenance. Projects that utilize structural BMPs shall prepare <br />an operation and maintenance plan that is prepared in accordance with the SWMMEW. <br />H. Core Element No. 8: Local Requirements. Projects that meet the requirements of Kittitas County <br />Road Standards will meet any optional requirements that are adopted as a part of this chapter or <br />required by Kittitas County Public Works. <br />I. Conveyance Systems. All new conveyance systems, and existing conveyance systems receiving <br />increased flow rates as a result of a project, shall be analyzed and designed to manage twenty -five - <br />Title 12 Kittitas County Code I Draft No. 5 — Working Draft for Adoption 6/12/2018 <br />48 <br />