Item C: Stormwater Development Standards

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ATTACHMENT A 3. Development sites within a drainage basin for which the city has constructed or approved a project to restore the receiving waterway, and the entire downstream system has been designed to accommodate full build-out conditions within the drainage basin. (3) Standards. (a) Applications shall demonstrate, using methodology in the Stormwater Management Manual, that peak rates of flow delivered to an existing open waterway at a point above 500 feet in elevation will not increase during storms larger than the water quality design storm and smaller than the flood control design storm as a result of the development that is the subject of the application; (b) For purposes of designing the system as required by the standards in this section, the amount of impervious surface per lot is assumed to be the maximum lot coverage allowed for the use in the zone in which it is located, unless the applicant demonstrates otherwise. (c) All facilities to control the rate of stormwater runoff shall be sited, designed and constructed according to the Flow Control section of Chapter 1 and all of Chapter 2 of the Stormwater Management Manual. Flow control facilities must be designed using one of the three methodologies outlined in the Stormwater Management Manual. (d) The standards in EC 9.6792(3) may be adjusted pursuant to EC 9.8030(24). 9.6793 Stormwater Oil Control. (1) Purpose. The purpose of EC 9.6793 is to protect the city’s stormwater system from oil and grease from stormwater runoff of impervious surface areas on properties that produce high concentrations of these pollutants. (2)Applicability. Oil control standards set forth in EC 9.6793(3) apply to: (a) All new commercial and industrial development with parking lots that store wrecked or impounded vehicles; or (b) Any development that would result in an expected daily traffic count greater than one hundred vehicles per 1,000 square feet of gross building area, based on the most recent version of The Institute of Transportation Engineers’ Trip Generation Manual; or (c) Any development that would result in 100 or more off-street parking spaces; or (d) Any commercial or industrial development that receives an adjustment approving the installation of 125 percent or more of the minimum off-street parking spaces required by EC 9.6410(3), Ordinance - 8 2/3/06 - Ordinance includes changes made pursuant to the 1/9/06, 1/10/06 and 2/13/06 PC meetings. L:\CMO\2006 Council Agendas\M060313\S060313C-attA.doc