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08/26/2019 SITE DESIGN MEASURES: Shall mean Site planning techniques to conserve natural spaces and/or limit the amount of impervious surface at new development and significant redevelopment prolects in order to minimize runoff and the transport of pollutants in runoff. SOURCE CONTROL MEASURES: Shall mean 01 the seume of pollutien. Any schedules of activities, structural devices, prohibitions of Practices, maintenance procedures, managerial practices or operational practices that aim to prevent stormwater pollution by reducing the potential for pollution at its source. STORMWATER TREATMENT MEASURES: Shall mean any engineered system designed to remove pollutants from stormwater by simple gravity settling of particulate pollutants, filtration, biological uptake, media adsorption or any other physical, biological, or chemical process. Sec. 27A.37. - PERMANENT STORMWATER POLLUTION PREVENTION MEASURES REQUIRED: A. All Greup a -PC.3 Regulated Projects shall include permanent stormwater pollution prevention measures in order to reduce water quality impacts of stormwater runoff from the entire site for the life of the project. cl..^IrlGaRt Fedevelepme t ^C.3 Regulated Projects that result in an increase of, or replacement of, more than fifty percent (50%) of the impervious surface of a previously existing development shall include permanent stormwater pollution prevention measures sufficient to reduce water quality impacts of stormwater runoff from the entire site for the life of the project. 2. SignifiGant FedevelGpFnen4C.3 Regulated Projects that result in an increase of, or replacement of, fifty percent (50%) or less of the impervious surface of a previously existing development shall include permanent stormwater pollution prevention measures sufficient to reduce water quality impacts of stormwater runoff from the increased or replaced portion of the site for the life of the project. G --B. Stormwater treatment measure proposed as part of a project's permanent stormwater pollution prevention measures shall be designed in accordance with the following hydraulic sizing criteria to treat stormwater runoff. Volume Hydraulic Design Basis: Stormwater treatment measures that detain stormwater for a certain period and treat primarily through sedimentation and infiltration, whose primary mode of action depends on volume capacity, such as ATTY/ORD.488/CC ORDINANCE AMENDING CHAPTER 18 & 27A— GREEN INFRASTRUCTURE ORDINANCE NO. 2465 REV: 06-20-19 PR MUFF NO. 802 Page 6 of 9