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ATTY/ORD.0010/CC ORD AMENDING MUNI CODE CH.18, 27A, 30 – EXHIBIT B REV: 09-17-24 VR Page 2 of 4 be amended from time to time. The design and implementation of the PSPPM must be in accordance with the guidelines and technical specifications provided by the City or other City-approved authority and the requirements of Order No. R2-2015-0049. The design and implementation of the PSPPM must also incorporate green infrastructure designed to limit contributions of urban runoff pollutants to San Francisco Bay per the MRP. 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 projects in order to minimize runoff and the transport of pollutants in runoff. SOURCE CONTROL MEASURES: Shall mean 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 C.3 Regulated Stormwater Treatment 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. 1.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.C.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. 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.