Item 2: Ordinance on Water Quality Overlay Zone

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1. The use of heavy machinery shall be the minimum necessary for the use or activity and shall be restricted to those areas where its use is necessary; 2. The use of heavy machinery within the channel shall be limited to the period between June 15 and September 30 except as allowed by permit from the Army Corps of Engineers or Oregon Department of State Lands; and 3. On sites where soils are severely compacted through the use of heavy machinery, the soils shall be tilled or re-tilled to a depth of 6 inches. Construction may also be subject to construction site management practices such as the erosion prevention provisions of EC chapter 6, which apply to, among other things, clearing, grading, grubbing, excavation and filling. (4) Utility Alignment. Routing of new utility lines to accommodate a use listed in EC 9.4780(3) shall be designed so as to minimize adverse impacts to water quality within the /WQ Management Area to the greatest extent practicable. (5) Paved Surfaces. Construction of new paved surfaces to accommodate a use listed in EC 9.4780(3) shall comply with the following standards: (a) Impervious surfaces shall be minimized by constructing the facility or infrastructure with as little impervious surface as allowed by city standards and the Americans With Disabilities Act; (b) Impervious surfaces shall be located as far from the waterway as practicable; and (c) For paved foot paths, lightly used access roads, or low volume parking areas where soils and flat topography will facilitate infiltration of runoff, pervious pavement systems, or other infiltration devices approved by the planning director or city engineer shall be used in lieu of standard impervious paving surfaces to increase infiltration of stormwater where practicable. For the purposes of this subsection, gravel surfaces are considered pervious unless they cover impervious surfaces or are compacted to a degree that causes their rational method runoff coefficient to exceed 0.8, determined in accordance with the city’s adopted Public Improvement Design Standards Manual. (6) Stream and Channel Crossings. Bridges, culverts or other structures that cross waterways permitted under EC 9.4780(3) shall comply with the following standards: (a) Crossings shall be designed and constructed in a manner that results in the least physical impact to the waterway, utilizing a minimum width, appropriate invert elevations and slope, and aligned at right angles to the waterway whenever practicable; (b) Culverts and bridges shall not increase or decrease water depth, velocity or flow rate upstream or downstream from the culvert, except as necessary to address conveyance needs identified in the city’s adopted Stormwater Management Manual or as otherwise allowed or required by this code; (c) When a culvert 72 inches in diameter or greater would be required, bridges shall be utilized, or box or arch culverts with bottoms filled to a depth of at least 12 inches with stone; and Ordinance - 15