Item 4: PH - Ordinance on Stormwater Development Standards

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following applies: 1. The area generating untreated runoff is less than 500 square feet of impervious surface and is isolated from the pollution reduction facility; 2. The area generating untreated runoff is less than 500 square feet of impervious surface and it is not technically feasible to drain the untreated runoff to the pollution reduction facility; 3. Constructing pollution reduction facilities to treat the runoff from the area at issue would require removal of trees or damage to other natural resources; or 4. The area generating untreated runoff is less than 500 square feet of impervious surface and limited access to the area would prevent regular maintenance of the pollution reduction facility. (b) The requirement in EC 9.6792(3)(b) that all pollution reduction facilities be selected from and sited, designed, and constructed according to the pollution reduction provisions and the facility design requirements set forth in the Stormwater Management Manual and that pollution reduction facilities must be designed using one of the methodologies outlined in the Stormwater Management Manual may be adjusted upon finding that all of the following requirements are met: 1. The proposed alternative design will achieve equal, or superior, results for function (reducing pollution), maintainability and safety, and the proposed siting does not adversely affect structures or other properties. 2. The applicant’s written description of the proposed alternative design has been reviewed and approved by the City Engineer. The description of the proposed design submitted for review must include all of the following information for each component of the proposed alternative design: a. Size, technical description, capacity, capital cost, design life, construction process and costs, consequences of improper construction, operation and maintenance requirements and costs; b. Data on the effectiveness of proposed alternative technologies, if available, including data from laboratory testing and pilot/full-scale operations, and information regarding the operations of any full-scale installations; c. Any other available information about the proposed design, including peer review articles, scientific or engineering journals, and approvals from other Ordinance - 15 L:\CMO\2006 Council Agendas\M060410\S0604104-attA.doc 4/3/06 - Ordinance includes changes made pursuant to the 1/9/06, 1/10/06 and 2/13/06 PC meetings and the 3/13/06 City Council Work Session.