(a) The requirements and standards of this section shall apply to all new developments and redevelopment projects. The intent of these regulations is to minimize the discharge and transport of pollutants to storm drain systems and prevent the deterioration of water quality.
(b) For development and redevelopment work disturbing one acre or more, including projects less than one acre that are part of a larger common plan of development or sale, the first one inch of rainfall from a 24-hour storm preceded by 48 hours of no measurable precipitation shall be retained and managed on site. Runoff volume reduction can be achieved by one or more of the following practices: canopy interception, soil amendments, evaporation, rainfall harvesting, engineered infiltration, extended filtration, and evapotranspiration. This first one inch of rainfall must be managed with no discharge to surface waters or the City stormwater system.
(c) Commercial, industrial, institutional, municipal, or transportation related operations that may produce higher levels of stormwater pollutants, or present a higher potential risk for spills, leaks, or illicit discharge, including but not limited to gas stations, petroleum wholesalers, vehicle maintenance and repair, auto recyclers, recycling centers, scrap yards, landfills, solid waste facilities, wastewater treatment plants, airports, railroad stations and associated maintenance facilities, and highway maintenance facilities, shall provide water quality treatment for associated pollutants (e.g., petroleum hydrocarbons at a vehicle fueling facility) before infiltration.
(d) Commercial, industrial, institutional, municipal, or transportation related operations that may produce higher levels of stormwater pollutants, or present a higher potential risk for spills, leaks, or illicit discharge, including but not limited to gas stations, petroleum wholesalers, vehicle maintenance and repair, auto recyclers, recycling centers, scrap yards, landfills, solid waste facilities, wastewater treatment plants, airports, railroad stations and associated maintenance facilities, and highway maintenance facilities that cannot implement adequate preventive or water quality treatment measures to ensure compliance with groundwater and surface water quality standards must properly convey stormwater to a NPDES-permitted wastewater treatment facility or via a licensed waste hauler to a permitted treatment and disposal facility.
(e) Any project that discharges or proposes to discharge to any surface water or ground water that is used as a source of drinking water must comply with all applicable requirements relating to source water protection.
(f) All development and redevelopment work disturbing one acre or more, including projects less than one acre that are part of a larger common plan of development or sale, shall be reviewed by the City prior to applying for a building permit to determine that the concept plan and performance standards comply with this ordinance, all State and Federal permits, and the Clean Water Act.
(g) All new developments and redevelopment work disturbing one acre or more, including projects less than one acre that are part of a larger common plan of development or sale, shall include stormwater management plans and drainage plans as described in this section as part of the building permit application.
(h) All applications for a building permit shall include:
(1) Detailed construction documents including plans, profiles, cross sections and details showing property lines, existing topography and conditions, and all proposed work signed by a registered professional engineer;
(2) Detailed construction documents including plans, profiles, cross sections, and details showing BMP and the sediment and erosion control plan and signed by a registered professional engineer;
(3) A statement on the construction documents showing the total impervious area measured in square feet; and
(4) Calculations prepared by a registered professional engineer showing post development runoff compliant with this article and indicating the adequacy of the stormwater system in handling such runoff.
(i) As-built documents prepared by a registered professional engineer showing as-built drawings of the actual construction and the improvement as-built compliant with the building permit and this article shall be submitted to the City within 30 days of completion of the work and prior to a certificate of occupancy being issued.
(j) The registered professional engineer signing the construction documents, calculations, and as-built documents shall be the engineer of record.
(k) The City may require any additional drawings, calculations, or information deemed necessary for evaluation of development or redevelopment.
(l) Stormwater detention or retention facilities shall be installed prior to commencing other development work. The City may choose not to conduct building inspections until all required control measures are properly installed.
(m) The following watershed protection elements shall be used to manage the impact of stormwater on receiving waters:
(1) Minimize the amount of impervious surfaces, including but not limited to roads, parking lots, and roofs, within each watershed, by minimizing the creating, extension, and widening of roads, parking lots, and associated development and encouraging the use of low impact development and green infrastructure practices;
(2) Preserve, protect, create, and restore ecologically sensitive areas, including but not limited to riparian corridors, headwaters, floodplains, and wetlands, that provide water quality benefits and serve critical watershed functions;
(3) Implement stormwater management practices that prevent or reduce thermal impacts to streams, including vegetated buffers along waterways, and disconnecting discharges to surface waters from impervious surfaces such as parking lots;
(4) Seek to avoid or prevent hydromodification of streams and other water bodies caused by development, including but not limited to roads, highways, and bridges;
(5) Implement standards to protect trees and other vegetation with important evapotranspirative qualities; and
(6) Implement policies to protect native soils, prevent topsoil stripping, and prevent compaction of soils.
(Ord. 2262. Passed 8-16-18.)