23.50A.064

The following uses are identified as Council conditional uses on Table A for 23.50A.040 and may be permitted by the Council when provisions of this Section 23.50A.064 and Section 23.50A.060 are met: A. Sewage treatment plants may be permitted as a Council conditional use in the MML and IC zones according to the following criteria: 1. The plant shall be located so that adverse impacts would not affect large concentrations of people, particularly in residential and commercial areas; 2. The negative impacts of the use can be satisfactorily mitigated by imposing conditions to protect other property in the zone or vicinity and to protect the environment. Appropriate mitigation measures shall include but are not limited to: a. A facility management and transportation plan shall be required. The level and kind of detail to be disclosed in the plan shall be based on the probable impacts and/or scale of the proposed facility, and shall at a minimum include discussion of sludge transportation, noise control, and hours of operation, and shall be incorporated into the design and operation of the facility; b. Measures to minimize potential odor emission and airborne pollutants including methane shall meet standards of and be consistent with best available technology as determined in consultation with the Puget Sound Clean Air Agency, and shall be incorporated into the design and operation of the facility; c. Methods of storing and transporting chlorine and other hazardous and potentially hazardous chemicals shall be determined in consultation with the Seattle Fire Department and incorporated into the design and operation of the facility; d. Vehicular access suitable for trucks shall be available or provided from the plant to a designated arterial improved to City standards; and e. Landscaping and screening, separation from less-intensive zones, noise, light and glare controls, and other measures to ensure the compatibility of the use with the surrounding area and to mitigate adverse impacts shall be incorporated into the design and operation of the facility. B. Heliports may be permitted as a Council conditional use in MML, II, and IC zones according to the following criteria: 1. The heliport is to be used for the takeoff and landing and servicing of helicopters which serve a public safety, news gathering or emergency medical care function; is part of a City and regional transportation plan approved by the City Council and is a public facility; or is part of a City and regional transportation plan approved by the City Council and is not within 2,000 feet of a residential zone; 2. A need shall be determined for the facility at the proposed location; 3. The heliport is located to minimize impacts, such as noise and dust impacts, on lots in the surrounding area; 4. The lot is of sufficient size that the operations of the heliport and the flight paths of helicopters are buffered from the surrounding area; 5. Open areas and landing pads are hard-surfaced; and 6. The heliport meets all federal requirements including those for safety, glide angles, and approach lanes. C. Airports may be permitted as a Council conditional use in the MML and IC zones according to the following criteria: 1. A need shall be determined for the facility at the proposed location; 2. The impacts of the proposal shall be evaluated so that the negative impacts can be satisfactorily mitigated by imposing conditions to protect other property in the zone or vicinity and to protect the environment. Appropriate mitigation measures shall include, but are not limited to: a. The site shall be located so that adverse impacts associated with landing and takeoff activities, including noise levels and safety conditions, will not affect large numbers of people in the immediate vicinity as well as in the general landing path of the flight pattern; b. A facility management and transportation plan shall be required. At a minimum, the facility management and transportation plan shall demonstrate noise control, vehicle and service access, and hours of operation, and shall be incorporated into the design and operation of the facility; and c. Landscaping and screening, separation from less-intensive zones, noise, light and glare controls, and other measures to ensure the compatibility of the use with the surrounding area and to mitigate adverse impacts shall be incorporated into the design and operation of the facility. D. Solid waste incineration facilities may be permitted as a Council conditional use in MML zones according to the following criteria: 1. The lot is located so that large concentrations of people, particularly in residential and commercial areas, are not exposed to unreasonable adverse impacts; 2. Measures to minimize odor emission and airborne pollutants shall be determined in consultation with the Puget Sound Clean Air Agency. These measures shall be incorporated into the design and operation of the facility; 3. A transportation plan may be required. The Director shall determine the level of detail to be disclosed in the plan based on the probable impacts and/or scale of the proposed facility. E. Helistops may be permitted as a Council conditional use in MML, II, UI, and IC zones according to the following criteria: 1. The helistop is not within 1,200 feet of a residential zone; 2. The helistop is located to minimize impacts, such as noise and dust impacts, on lots in residential zones; 3. The lot is of sufficient size that the operations of the helistop and the flight paths of the helicopter are buffered from the surrounding area; 4. Open areas and landing pads are hard-surfaced; and 5. The helistop meets all federal requirements, including those for safety, glide angles and approach lanes. ([Renumbered from 23.50A.006.C]; Ord. 126862 , § 8, 2023.)