With the approval of the City Engineer, the following activities may be exempted from on-site stormwater runoff control. An exemption shall apply only to the requirement for on-site stormwater detention or retention facilities. All other design elements such as the storm sewer system, road culverts, erosion and sedimentation control, and runoff quality (unless otherwise exempted) shall not be exempted.
(A) Emergency exemption. Emergency maintenance work performed for the protection of public health and welfare, however, if the earth-disturbing activity would have required an approved erosion and sediment control plan, if the activity were not an emergency, then the land area disturbed shall be shaped and stabilized in accordance with the requirements of the city.
(B) Maintenance exemption. Any maintenance to an existing system made in accordance with plans and specifications approved by the City Engineer.
(C) Development-related exemptions. The applicant shall provide to the City Engineer in writing a request for exemption which shall include a scaled site map, property tax number, and street address if applicable.
(1) Single-family or duplex exemption. Single-family or duplex residential construction on a single lot that is not part of a larger common plan of development.
(2) Any construction which adds less than 2,000 square feet through expansion of a building, structure or pavement which results in new impervious area on a project site.
(3) It is conceivable that development situations not automatically subject to exemption may exist such that development will have none of the harmful effects of sediment deposition. Such development situations, subject to city concurrence, are eligible for a waiver from this regulation. Waiver requests shall be made in writing to the City Engineer and shall include sufficient detail to support that granting a wavier will not be detrimental to abutting properties or to watercourses, public waters, or to the sewer system.
(D) Scioto River Corridor Exemption. Parcels that are located between State Route 745 (Dublin Road) and State Route 257 (Riverside Drive) which are directly tributary to the Scioto River.
(E) Bridge Street District Exemption. The city has established exemptions to Stormwater Management Requirements due to parcel location within the Bridge Street District. The applicant needs to review the current version of the city's Stormwater Management Design Manual to determine the requirement that needs to be followed for their proposed development.
(F) Regular farming activities on land intended for such use, except when these activities involve practices which increase storm water runoff and exacerbate erosion and sedimentation.
(G) Tilling, planting or harvesting of agricultural, horticultural, or forest crops that employ soil conservations related to agriculture as follows: construction of terraces, terrace outlets, check dams, desilting basins, dikes, ponds, ditches, strip cropping, lister furrowing, contour cultivating, contour furrowing, and land drainage and land irrigation which does not cause an increase in stormwater runoff and does not exacerbate erosion and sedimentation.
(H) Minor earth-disturbing activities such as home gardens and individual home landscaping, repairs, service connections and maintenance work.
(I) Installation, maintenance or repair of any underground public utility lines when such activity occurs on an existing hard surfaced road, street or sidewalk (provided the earth-disturbing activity is confined to the area of the road, street or sidewalk that is hard surfaced), and does not involve dewatering operations that produce sediment-laden effluent discharging to surface-lands and/or surface-waters.
(J) Septic tank lines or drainage fields unless included in an overall plan for earth-disturbing activity relating to the construction of the building to be served by the septic tank system.
(K) Repair or rebuilding of the tracks within the right-of-way of a railroad company.
(L) Stream Corridor Protection Zone. Stream corridor protection zones are not required if a preliminary plan has already been approved for a site at the time this chapter is passed.
(M) Historic Dublin. Development within this area, as defined in the Zoning Code, shall be exempt from compliance with the city's stormwater quantity regulations but shall be held in compliance with the city's storm water quality regulations, described in § 53.090, if the construction activities disturb one or more acres of total land.
(Ord. 48-05, passed 9-6-05; Am. Ord. 86-14, passed 9-8-14)