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12.06.030 Exemptions. <br />Projects exempt from this code include the exemptions and partial exemptions listed in the <br />SWMMEW, Sections 2.1.3, 2.1.5 and 2.1.6, current edition. Local exemptions shall be determined <br />through the variance process outlined in KCC 12.06.080. (Ord. 2015-010, 2015) <br />12.06.040 General Requirements. <br />The following requirements shall be implemented in accordance with the SWMMEW: <br />A. Core Element No. 1. Prepare a stormwater site plan prior to final plat approval that will be <br />reviewed by the County Engineer according to all of the applicable core elements as defined below. <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 <br />reasonable source control BMPs. Operational and structural source control BMPs shall <br />be selected, designed and maintained according to the SWMMEW. <br />D. Core Element No. 4: Preservation of Natural Drainage Systems. Preserve natural <br />drainage systems to the extent possible at the site. <br />E. Core Element No. 5: Runoff Treatment. Projects that result in five thousand square <br />feet or more of new pollutant -generating impervious surfaces shall design, size, <br />construct, operate and maintain runoff treatment at the site. <br />F. Core Element No. 6: Flow Control. Projects that result in ten thousand square feet or <br />more of new imperious surfaces shall design, size, construct, operate and maintain <br />stormwater flow control facilities at the site. <br />G. Core Element No. 7: Operation and Maintenance. Projects that utilize structural BMPs <br />shall prepare an operation and maintenance plan that is prepared in accordance with <br />the SWMMEW. <br />H. Core Element No. 8: Local Requirements. Projects that meet the requirements of <br />Kittitas County Road Standards will meet any optional requirements that are adopted as <br />a part of this chapter or required by Kittitas County Public Works. <br />I. Conveyance systems shall be analyzed and designed to manage the twenty -five-year <br />peak flows from core element Nos. 5 and 6. <br />(Ord. 2015-010, 2015) <br />12.06.050 Drainage Facilities. <br />Culverts with a minimum diameter of 15 inches must be installed at all County road intersections and <br />at all crossings of well defined natural drainage courses, unless other provisions are made to handle <br />the passage of surface run-off through the roadway prism. BMPs shall be used during construction <br />to manage stormwater. All internal development roads shall handle all stormwater within the <br />development. <br />All drainage facilities within current or future County right-of-way must be of the type and nature <br />that can be easily maintained by the County. All stormwater facilities within the development and <br />outside the County's right-of-way shall be maintained by the developer or homeowner's association. <br />(Ord. 2015-010, 2015) <br />12.06.060 Submittal Requirements. <br />Submittal Requirements for Stormwater Site Plans (Reference Ch.3 of the SWMMEW): <br />A. Preliminary Submittal Requirements <br />