[Ord. No. 6906, 11-26-2024]
The South 40 Overlay Zoning District (hereinafter known as the "S40 Overlay") is intended to facilitate the use and development of campuses and facilities for university and college uses. This area of the City has a unique concentration of advanced education uses that require careful consideration to balance educational, recreational, and residential needs of institutions with the character of adjacent low-density residential areas. The S40 Overlay is intended to modify the underlying zoning district regulations only to the extent specifically set forth in this Article. If not specifically modified in this Article, the regulations in effect in the underlying zoning district will remain in full force and effect.
[Ord. No. 6906, 11-26-2024]
The S40 Overlay consists of the South 40 Campus of Washington University in St. Louis. The official boundary of the S40 Overlay is as described in the district map exhibit hereunder.
Figure 1: District Map
[Ord. No. 6906, 11-26-2024]
A. 
Development shall be compatible with the district character as established below.
1. 
The Danforth Campus of Washington University in St. Louis to the north and surrounding single-family residential neighborhoods to the east, south, and west of the S40 Overlay provide a wide range of contextual building typologies, scales, and materials. Unlike the Danforth Campus, however, the S40 Overlay should not be reliant on specific stylistic conventions, but buildings should be designed with care and consideration for timeless architecture and durable, beautiful materials that harmonize with the surrounding brick, stone, and wood construction. New buildings should avoid neoclassicist or revivalist styles, and should address qualities and principles present in the surrounding contexts, including scale, proportion, fenestration, massing, datums, rhythms and patterns, hierarchy, and balance.
2. 
Sustainable design principles should inform the development of all new construction in terms of efficiency measures for energy, water, and waste.
3. 
Site development should focus on regeneration and restoration. Non-recreation areas should rely on native and non-invasive species plantings, and largely feature non-turf areas and low maintenance landscape.
4. 
Site development and layout should prioritize preservation of existing trees and topography.
5. 
Site design should integrate new facilities with the existing context, focus activity to the interior of the S40 Overlay, and minimize noise and light trespassing from the S40 Overlay.
6. 
Utilities and service functions should be screened from adjacent property and incorporated into the campus design to minimize visibility, noise, and impact.
7. 
The S40 Overlay should foster a built environment that is friendly to the presence of people living, learning, visiting, and working.
B. 
Property within the South 40 Overlay shall not be eligible for rezoning to a planned unit development or redevelopment per Chapter 405, Article X, Planned Unit Development District.
[Ord. No. 6906, 11-26-2024]
The uses permitted and conditionally permitted are the same as outlined in the base zoning district, with the following modifications:
A. 
Mixed-Uses. Facilities and buildings consisting of multiple uses are permitted so long as all uses are allowed under the base zoning district and/or the S40 Overlay.
B. 
Primary Uses. College and university uses are defined as the following and are permitted by right and subject to the S40 Overlay regulations:
1. 
Any use of the grounds or building or portion thereof that is used for the teaching of college and university classes, research facilities and administrative and operational facilities, or any similar function and use for collegiate and university educational and research purposes.
2. 
Dormitories and residential halls providing housing for students, faculty, and staff.
3. 
Detached multi-unit housing/multiple structures on a single parcel for the purpose of housing students, faculty, staff, visitors or other members of a college or university community.
C. 
Accessory Uses. Accessory uses shall be a subordinate building or use customarily incidental to the primary building or use, subordinate in area, extent or purposes to the primary building or use, and limited to and contributing to the comfort, convenience or necessity of the primary building or use. College and university accessory uses in support of primary uses in the S40 Overlay and defined as the following are permitted by right and subject to the S40 Overlay Zoning District regulations:
1. 
Catering facilities.
2. 
Communications and media facilities.
3. 
Dining or food service facilities.
4. 
Exhibition, film and performance facilities including studios.
5. 
Health services including pharmacies, excluding hospitals, urgent care centers, or similar facilities that provide care and service to the general public.
6. 
Library and study facilities.
7. 
Nursery or greenhouse.
8. 
Parking lots and multi-level parking structures.
9. 
Places of religious worship.
10. 
Recreation building, structure or grounds.
11. 
Retail for the benefit of the campus community but not primarily serving patrons outside of the university.
12. 
Short-term lodging for educational, research, athletic or community benefit purposes including when school is not in regular session.
13. 
Solar energy systems, building- or ground-mounted (subject to the provisions of Chapter 405, Article XXVIII).
14. 
Student and campus activity spaces.
15. 
Student owned and/or managed retail operations for experiential learning purposes and/or for the benefit of the campus community but not primarily serving patrons outside of the university.
16. 
Temporary buildings or structures.
17. 
Restrooms, drinking fountains, and similar support buildings or structures.
18. 
Wind energy systems, building-mounted (subject to the provisions of Chapter 405, Article XXVIII).
D. 
Prohibited Uses. Uses not expressly listed in this Section as approved primary or accessory uses shall be prohibited. All permitted uses shall be provided for students, faculty, and employees of the university or patrons visiting the site to support university uses or patrons associated with an event hosted on the property. Uses providing services to the general public outside of events or activities associated with permitted primary and accessory uses shall be prohibited. Full university graduation ceremonies (conferring degrees in all or substantially all schools and programs), WILD, and ThurtenE shall be prohibited.
E. 
Outdoor events and activities where anticipated attendance of non-South 40 residents is five hundred (500) people or more shall require issuance of a special event permit in accordance with the City's event guidelines.
[Ord. No. 6906, 11-26-2024]
A. 
Coverage And Density.
1. 
Lot coverage by impervious material, including structure footprints, shall be limited to a maximum of sixty percent (60%) of the total S40 Overlay area.
2. 
Structure footprints shall not occupy more than one-third (1/3) of the total S40 Overlay area.
3. 
Residential (dormitories) density limits for the S40 Overlay shall be calculated for the district in its entirety at a rate of ninety-four (94) beds per acre.
B. 
Height. Building height shall be limited to sixty-seven (67) feet.
1. 
Buildings or portions of buildings located within one hundred fifty (150) feet of the southern district boundary shall have a maximum building height of fifty (50) feet.
2. 
For new construction and additions, the proposed grade plane shall not deviate from the existing grade plane by more than six (6) feet without Site Plan Review approval per Chapter 405, Article VIII.
3. 
Elevator and stair overruns, mechanical screening, renewable energy systems, and similar architectural features may exceed the building height maximum by up to fifteen (15) feet.
4. 
Accessory buildings shall be equal to or less than twenty-five (25) feet in height.
C. 
Layout And Access.
1. 
Active portions of buildings and outdoor spaces should be generally oriented toward the interior of the S40 Overlay, except along Forsyth Boulevard, Big Bend Boulevard, or at permitted gateways providing vehicle and/or pedestrian access to the S40 Overlay.
2. 
Visible utilities and accessory structures should be minimized through screening, underground vaults, or incorporation into surrounding buildings.
3. 
Parking shall be located interior to the S40 Overlay or within enclosed parking structures to the maximum extent feasible.
4. 
Primary and secondary access points to the S40 Overlay shall be designed and located to minimize traffic through adjacent residential neighborhoods.
a. 
Primary access shall be limited to one (1) vehicle access point along Forsyth Boulevard and one (1) vehicle access point along Big Bend Boulevard.
b. 
Vehicle access along Wydown Boulevard shall be limited to one (1) emergency access point only.
c. 
Vehicle access shall not be provided from Ellenwood Avenue.
d. 
Pedestrian and bicycle access points shall be provided from Forsyth Boulevard and adjacent to the intersection of Wydown Boulevard and Big Bend Boulevard. Secondary access points are permitted from all district boundaries.
5. 
Accessory buildings may be oriented toward any street or towards the interior of the S40 Overlay.
D. 
Lighting.
1. 
General exterior lighting shall be limited to maintaining IES recommended levels for safety.
2. 
The DarkSky International principles shall be used as a guideline and all playing surfaces shall be certified through the DarkSky Outdoor Sports Lighting Program.
a. 
Certification of DarkSky International OSL Compliant Design shall be provided to the Director of Planning and Development Services prior to construction.
b. 
Certification of DarkSky International Compliant Installation shall be provided to the Director of Planning and Development Services within six (6) months of project completion, with extensions for scheduling at the discretion of the City Manager or his/her designee.
3. 
Section 405.360, Outdoor Lighting Standards, shall apply to the S40 Overlay, with the following exceptions:
a. 
Emergency lighting throughout the S40 Overlay Zoning District may be installed to University Standards.
b. 
Outdoor playing surface lighting is permitted after 7:00 A.M. and until 9:30 P.M. University varsity level games may continue to the end of the inning that is underway before 10:00 P.M. for baseball and softball.
c. 
Standards for lighting throughout the S40 Overlay Zoning District shall be as follows:
(1) 
The S40 Overlay District and structures shall conform to regulations as set forth under Section 405.360, Appendix A, Zoning District Requirements, "Residential Zoning Districts."
(2) 
All parking uses including lots and structures shall conform to regulations as set forth under Section 405.360, Appendix A, Other Use Requirements, "Open Parking Structures and Parking Below a Building."
(3) 
All recreation and athletic uses shall conform to regulations as set forth under Section 405.360, Appendix A, Other Use Requirements, "Private Recreation Use."
(a) 
The maximum uniformity ratio (maximum to minimum) shall be modified to be 2:1 on playing surfaces and 10:1 on the remainder of the site.
(4) 
The Plan Commission shall have the authority to approve the application of the regulations as set forth under Section 405.360, Appendix A, Zoning District Requirements, "Commercial, Service, Downtown Clayton, Mixed uses including office and retail/restaurant" to a specific use, building, or area to address documented safety and security issues.
4. 
Light fixtures existing as of the date of adoption of this Code may be used and maintained as currently operated and functioning. Any new or replacement lights shall comply with this Code.
E. 
Setbacks. Setbacks for buildings, structures and other improvements specifically listed shall be required as follows:
1. 
There shall be no setback requirements from property lines that divide interior portions of the S40 Overlay. All required setbacks shall be established and measured from the district boundaries.
2. 
Should there be any conflicts between the setbacks required herein and the transition zones required per Section 410.905(F), the required transition zone shall apply.
3. 
From the northern district boundary, along Forsyth Boulevard, the minimum building setback is forty (40) feet. Surface parking shall also adhere to the northern building setback.
4. 
From the southern district boundary, along Wydown Boulevard, the minimum building setback is sixty (60) feet. Surface parking shall also adhere to the southern building setback, except along the easternmost two hundred (200) feet of the southern boundary where surface parking may be located up to fifteen (15) feet from the southern district boundary with landscape screening located in the required setback.
5. 
From the western district boundary, along Big Bend Boulevard, the minimum building setback is fifty (50) feet. Surface parking shall also adhere to the western building setback.
6. 
From the eastern district boundary, the minimum building setback is forty (40) feet, except where a greater transition zone is required per Section 410.905(F). Surface parking shall not be confined by the eastern building setback and may be located up to fifteen (15) feet from the eastern district boundary unless a greater transition zone is required per Section 410.905(F) or along the southernmost two hundred (200) feet of the eastern boundary where surface parking may be located up to the district boundary.
7. 
Setbacks for buildings greater than three stories or fifty-five (55) feet in height shall be a minimum of sixty (60) feet from any district boundary shared with non-institutional residential uses or shared with unaffiliated institutions. This shall not apply where the district boundary abuts a public street.
8. 
Accessory buildings measuring two hundred (200) square feet or less in gross floor area shall be located a minimum of twenty (20) feet from the southern district boundary and a minimum of fifteen (15) feet from the northern, eastern, and western district boundaries unless a greater transition zone is required.
9. 
Basements and parking facilities that are completely underground shall be subject to the building setbacks outlined above.
10. 
There shall be no setback requirements for pedestrian paths, bicycle paths, or fences.
11. 
There shall not be any setback requirements for retaining walls, except for the following. Retaining walls greater than or equal to ten (10) feet in height, as measured from the base of the footing to the top of the wall, that hold grade within the district boundary at a higher elevation than grade outside of the distract boundary shall be located a minimum of ten (10) feet from the district boundaries. See Section 410.905(G) for additional grading and retaining wall regulations.
12. 
Playing surfaces at grade shall be located a minimum of five (5) feet from the northern and eastern district boundaries unless a greater transition zone is required per Section 410.905(F). Playing surfaces at grade shall adhere to the building setbacks from the western and southern district boundaries.
13. 
There shall not be any setback requirements for light poles providing lighting for wayfinding or security purposes. Light poles for playing surfaces may be located a minimum of five (5) feet from any district boundary.
14. 
Mechanical equipment shall conform to the building setbacks.
15. 
Multiple buildings shall be allowed on one lot and there shall not be a minimum setback requirement between buildings within the S40 Overlay, however, this shall not modify or reduce any standards or requirements of the applicable Building Codes or Fire Codes adopted by the City.
F. 
Transition Zones. Transition zones are buffer areas where buildings, structures, improvements and uses other than landscape, sidewalks, bicycle paths, or emergency access routes shall not be permitted. Transition zones shall be required as follows:
1. 
Where the S40 Overlay abuts a site not located in the S40 Overlay that is improved and used as a single-family residence, a transition zone measuring thirty (30) feet in depth shall be required.
a. 
This provision shall not apply when the adjacent single-family property is separated from the S40 by a publicly owned street.
b. 
This provision shall not apply when the adjacent single-family property is under common ownership with S40, however, improvements to the transition zone will be required upon sale of either property.
2. 
A transition zone shall be required along the southern district boundary, Wydown Boulevard, measuring a minimum of sixty (60) feet in depth, except for the easternmost two hundred (200) feet.
3. 
Transition zones shall not be reduced by any setback requirement.
4. 
Driveways and accessory structures associated with vehicle access points may be located within the associated required transition zones.
5. 
Transition zones shall be planted with a variety of shrubs and trees and may also include a fence or wall.
a. 
A solid screen wall shall not be permitted within the transition zone along Wydown Boulevard.
6. 
Light poles providing lighting for wayfinding or security purposes may be located anywhere within a required transition zone.
7. 
Retaining walls shall not be located within a transition zone, except where necessary to support a vehicle, pedestrian, or bicycle access point, to maintain grade for existing plantings and trees that are to remain, or to raise the grade of the transition zone above the grade interior to the district.
8. 
Driveways, sidewalks, and bicycle paths may connect to the outside of the district through a transition zone, but should not run within a transition zone parallel to the district boundary.
Figure 2: Transition Zone Design
G. 
Grading And Drainage.
1. 
New development should seek to restore more naturally graded topography than the current existing conditions; new development should promote restoration in a phased manner.
2. 
Large scale grading across the district shall incorporate a terracing plan to respect existing topographic conditions. The grade should not be lifted or reduced to create one (1) elevation across the S40 Overlay.
3. 
Site drainage patterns should be designed to prevent concentrated surface drainage for collecting on and flowing across adjacent lots, paths, walks and sidewalks, and individual or stands of mature trees scheduled for protection and preservation.
4. 
The site shall be designed so as not to increase the amount of stormwater runoff that exits from the site other than through approved connections to Metropolitan Sewer District (MSD) facilities as approved by MSD.
5. 
Retaining walls fifteen (15) feet in height or greater shall be tiered or stepped to include landscaping to reduce the visual impact of the wall from adjacent property outside the S40 Overlay. The depth (run) of each step shall be a minimum of four (4) feet to allow and support plantings of shrubs and/or trees. A minimum of one (1) step shall be required for every fifteen (15) feet of height. The number of steps or height (rise) of steps may vary, except walls within two hundred (200) feet of non-affiliated residential property that face outside of the district shall have a maximum wall height of ten (10) feet.
a. 
Through Site Plan Review, the Plan Commission may increase the maximum wall height per step from fifteen (15) feet to no more than twenty (20) feet for a wall located interior of the district or a wall facing the interior of the district when it is determined that sufficient landscape and visual buffers or provided.
Figure 3: Retaining Wall Step Requirement
[Ord. No. 6906, 11-26-2024]
A. 
All provisions of Chapter 405, Article XXX, Trees and Landscaping Regulations, shall apply with the following exceptions:
1. 
The S40 Overlay permits building and uses (such as recreational facilities) that may require large tracts of unencumbered surfaces. Accordingly, the S40 Overlay shall maintain a minimum tree canopy coverage (determined in accordance with the standards set forth in Article XXX) of twenty-five percent (25%) with any removal of trees requiring replacement as necessary to maintain the minimum coverage whether or not tree replacement is associated with a development project requiring site plan review.
2. 
Approved trees shall be selected to maintain arboretum accreditation.
3. 
Preservation of existing mature trees within and adjacent to the S40 Overlay is a priority and tree protection documentation and measures shall be provided per Section 405.4080 for all construction activities.
[Ord. No. 6906, 11-26-2024]
A. 
The requirement for off-street parking in the S40 Overlay shall be determined as follows:
1. 
A parking study shall be completed by a professional traffic and parking consultant to determine the appropriate parking requirements given the mixture of uses and shared parking design for the campus. This parking study shall be used to analyze parking needs as development occurs for a period of five (5) years, at which time the City may elect to either require an updated parking study or extend the use of the existing study for a specified term.
2. 
First year students housed in the S40 Overlay shall not be allowed to bring cars to campus.
3. 
Bicycle parking shall be provided based on the combination of uses per Section 405.3670, unless modified under the required parking study.
B. 
A minimum of one (1) loading dock space shall be provided for each campus dining facility that includes a food preparation area, or a similar use as determined by the Director of Planning and Development Services.
1. 
All loading and service areas shall be located interior to the site and screened from the public right-of-way.
2. 
The Director of Planning and Development services or his/her designee shall have the authority to permit a reduction in size to accommodate smaller vehicles if the proposed use is such that deliveries will be made by such vehicles.
C. 
Parking Lot Design Standards.
1. 
All surface parking areas shall be designed with landscape and/or tree islands to reduce the environmental impacts of large, paved areas. A minimum of one (1) canopy tree shall be required for every fifteen (15) surface parking spaces. Trees shall be planted directly adjacent to or within the parking lot area to maximize the amount of shaded area within parking lots.
2. 
Surface parking lots with photovoltaic systems or solar panel arrays used to cover parking spaces shall be exempt from the minimum number of trees required by Section 410.910(C)(1), above.
3. 
Use of permeable pavers or similar is strongly encouraged for surface parking spaces.
[Ord. No. 6906, 11-26-2024]
A. 
Procedure. For all applications considered by the Plan Commission and/or Architectural Review Board per the Site Plan Review and Architectural Review provisions outlined in this Section, written notification shall be sent by mail at least ten (10) days prior to the meeting date to the last known abode of the owners of properties within two hundred (200) feet of the South 40 Overlay District.
B. 
Site Plan Review pursuant to the procedures and standards outlined in Chapter 405, Article VIII, is required for:
1. 
New facility construction with a gross floor area of ten thousand (10,000) square feet or more.
2. 
Any expansion or addition measuring ten thousand (10,000) square feet or more to an existing structure or building.
3. 
Any expansion or addition which increases the footprint of the existing structure by fifty percent (50%) or more.
4. 
Any new construction or addition where the proposed grade plane deviates from the existing grade plane by more than six (6) feet.
5. 
Any new outdoor playing surface or recreational area of more than two thousand eight hundred (2,800) square feet, or any expansion thereof in excess of one-third (1/3) of its existing surface area.
6. 
Any new outdoor playing surface or recreational area or any expansion thereof in excess of one-third (1/3) of its surface area.
7. 
Any site work including grading or modifications to existing runoff patterns with a disturbance area equal to or greater than 0.5 acres or if determined by the Director of Planning and Development Services to involve significant or excessive changes to existing topography.
8. 
All ground-mounted wind energy renewable systems pursuant to Chapter 405, Article XXVIII; however, such systems may be reviewed in conjunction with the review of principal structures.
C. 
Architectural Review Board review is required when site plan review is required, for any new building or addition with a gross floor area of five thousand (5,000) square feet or more that is located within fifty (50) feet of a front yard, or for any accessory structure which is located within a building setback as allowed per Section 410.905(E). Administrative architectural review by the City Manager or his/her designee shall be completed for all other exterior modifications or projects. At the discretion of the City Manager or his/her designee, any project may be elevated from administrative review to the Architectural Review Board.
D. 
Architectural Standards. The following standards shall be applied to all development proposals and may only be modified through the process of alternative compliance outlined in Section 410.285.
1. 
Building Facades.
a. 
Building designs should incorporate variation in the facade, such as recesses and projections, or other architectural detailing in keeping with the district character identified in Section 410.895.
b. 
Materials for use on building facades should be high quality, durable, and establish a hierarchy of primary, secondary, and accent materials. Primary materials shall be masonry such as brick, terracotta, and/or stone and make up at least fifty percent (50%) of each facade not including window and door openings. Materials permitted by right in the S40 Overlay shall include anything permitted by the Building Code except for vinyl-based products.
(1) 
Other materials including new materials which may be developed shall be permitted subject to review by the Architectural Review Board.
c. 
Blank walls should be avoided, but may be permitted provided that they are complementary to the primary facades in organization and detailing.
2. 
Roofs And Parapets.
a. 
The following materials shall be permitted on roofs: asphalt shingles, cedar shingles or shakes, slate shingles (natural or synthetic), concrete tiles, metal, single ply membranes, green roofs (intensive or extensive), and blue roofs.
b. 
Roof forms shall not be limited to any specific geometry, but should be designed in a manner that promotes timeless, durable architecture that is cohesive within the S40 Overlay and complementary of surrounding context.
c. 
Parapet walls should be constructed of the primary material of the wall to which they belong, or complementary to the primary facades.
d. 
Photovoltaic systems shall be permitted on any roof within the S40 Overlay.
3. 
Windows And Doors.
a. 
Windows may be of aluminum, steel, wood, or fiberglass composite material and shall be of painted or anodized finish. Windows may contain opaque or transparent glazing.
b. 
Windows may be operable or fixed, but there shall be no minimum requirement for operable windows beyond what is required by Chapter 205, Article II, Fire Prevention Code, or Chapter 500, Building Codes and Building Regulations.
c. 
Doors may be of wood, clad wood, steel, or aluminum and shall be of painted or anodized finish. Doors may contain opaque or transparent glazing.
4. 
Walls And Fences.
a. 
Walls and fences may be used to establish edges of the S40 Overlay, to create outdoor spaces within the district, or to conceal parking or other utility structures and equipment.
b. 
Walls and fences may be a maximum height of eight (8) feet. The maximum height for walls or fences that provide screening of mechanical equipment or loading areas may be increased to the minimum height necessary to screen equipment or loading areas by the City Manager or his/her designee.
(1) 
Walls and fences located within ten (10) feet of Wydown Boulevard, Forsyth Boulevard, or Big Bend Boulevard shall be a maximum of five (5) feet in height and feature a decorative or ornamental design and be a maximum of fifty percent (50%) opaque unless an alternative height or design is approved by the Architectural Review Board. Walls or fences shall be buffered with a mix of evergreen trees, ornamental trees, and shrubs adjacent to right-of-way and adjoining properties.
c. 
Materials permitted for walls and fences shall be compatible with primary building facades.
(1) 
Materials for walls may include brick and stone masonry, tile masonry, concrete panels, concrete (cast-in-place or precast) and concrete block (split face or otherwise).
(2) 
Materials for fences may include metal (wrought iron, aluminum, steel, or similar), wood, or composite. Vinyl fencing shall not be permitted.
d. 
Pedestrian gates shall be permitted in walls and fences, and shall be complementary with the materials of the wall or fence.
5. 
Equipment.
a. 
Equipment may include any exterior mechanical, plumbing, or electrical utilities or building service equipment, garbage cans, dumpsters, recycling bins, storage tanks, or other similar mechanical equipment utilized for building operations.
b. 
Equipment located on grade shall not be located within a transition zone and shall be screened by screening, walls, fences, or landscaping.
c. 
Equipment located on rooftops or other elevated locations shall be concealed from view by the use of parapet walls or screening.
[Ord. No. 6906, 11-26-2024]
A. 
The S40 Overlay District shall adhere to Clayton Health, Safety and Welfare ordinances regarding noises (Chapter 215, Article XVI, Noises) with the following adjustments:
1. 
No person shall use, cause to be used, or operate any amplified electronic device in such a manner as to create an unreasonably loud noise or so as to be plainly audible by another person located on an adjoining residential property before 7:00 A.M. or after 9:30 P.M. University varsity level games may continue to the end of the inning that is underway before 10:00 P.M. for baseball and softball.
2. 
An acoustical study shall be required prior to installation of any amplified electronic devices or speaker systems installed for an outdoor facility. The amplified system shall be designed and located to minimize noise at the boundary of the district. The study shall ensure compliance with noise regulations and identify estimated changes in noise levels at the property lines from existing conditions.
a. 
The acoustical study shall be submitted to the City for review in conjunction with a required Building Permit, Site Plan Review Permit, or an Administrative/Architectural Review Permit.
3. 
A primary speaker system plan shall be provided for each playing surface or exterior speaker system that identifies the location, type, projected angle, and controls of each speaker.
a. 
A secondary speaker system plan shall be provided for each playing surface that identifies the concentrated system to be available for smaller events.
4. 
Amplified electronic devices for announcements and playing of music or similar may be used or operated on the property from 7:00 A.M. to 9:30 P.M. for university-sanctioned athletic, club, intramural, or social events as a part of the sports schedule and curriculum. University varsity level games may continue to the end of the inning that is underway before 10:00 P.M. for baseball and softball.
a. 
For activities and events without audience or public participation such as practices and intramurals, the secondary speaker system plan shall be utilized.
5. 
For noise generated from within the District, maximum noise levels measured at the property line abutting residential shall be sixty (60) dBA for steady noise and seventy (70) dBA for repetitive impulse noise.
6. 
Noise impacts to adjacent residential uses resulting from mechanical and utility equipment shall be mitigated through use of appropriate strategies depending on the context of the equipment including, but not limited to, sound-proofing, enclosures, landscaping, or walls.
[Ord. No. 6906, 11-26-2024]
A. 
The S40 Overlay Zoning District shall incorporate and follow best practices for sustainable design of athletic and recreational uses including principles for playing surfaces, parking, and structures. In addition to sustainable guidelines referenced elsewhere in this Code or other codes adopted by the City of Clayton when not in conflict with this Code, the following standards shall be established for the District:
1. 
Efforts shall be made to utilize on-site renewable energy sources such as solar and wind power.
2. 
Efforts shall be made to incorporate best management practices for stormwater, grading, and drainage facilities such as inclusion of planted bioswales or bioretention areas and rain gardens.
3. 
Native species of plants, flowers, shrubs, and trees shall be required for perennials and prioritized for annuals for use within the District.
4. 
New buildings shall be designed to meet the prevailing standards for new buildings on the Danforth Campus of Washington University in St. Louis at the time of permitting, but in no case shall buildings be designed to a standard less than that of LEED Silver (per 2024 LEED requirements). A similar or equivalent standard to that of LEED may be used. A higher standard may be obtained by the property owner but not required by the City. Buildings measuring less than five thousand (5,000) gross square feet in area shall be exempt from this requirement.
5. 
Best management practices (BMP) shall be used to ensure water quality of water runoff from synthetic turf playing surfaces is positively impacted. Appropriate BMPs shall be selected from the Metropolitan St. Louis Sewer District's BMP Toolbox or other BMPs specifically designed for synthetic turf playing surfaces that are accepted by the Metropolitan St. Louis Sewer District.
[Ord. No. 6906, 11-26-2024]
As used in this Article, the following terms shall have the meanings indicated:
BUILDING HEIGHT
The vertical distance, measured in feet, from the grade plane to the highest point of the coping of a flat roof or to the deck line of a mansard roof or to the mean height level between eaves and ridge of a gable, hip or gambrel roof.
dBA
Weighted decibel (dBA) is a unit to measure sound as perceived by the human ear.
EXISTING GRADE PLANE
A reference plane representing the average of the existing finished ground level prior to the commencement of any construction adjoining the proposed building footprint at exterior walls. Where the finished ground level slopes away from the exterior walls, the reference plane shall be established by the lowest points within the area between the building and the lot line or, where the lot line is more than six (6) feet (1,829 mm) from the building, between the building and a point six (6) feet (1,829 mm) from the building.
GRADE PLANE
A reference plane representing the average of finished ground level adjoining the building at exterior walls. Where the finished ground level slopes away from the exterior walls, the reference plane shall be established by the lowest points within the area between the building and the lot line or, where the lot line is more than six (6) feet (1,829 mm) from the building, between the building and a point six (6) feet (1,829 mm) from the building.
IMPULSE NOISE
Impulse noise is sound that is short in duration and not continuous or ongoing.
PLAYING SURFACE
The land or area designed, maintained, and prepared for playing a game or competing in athletic activities. Playing surfaces shall include fields and courts covered in natural and/or synthetic material. Playing surfaces are considered an athletic and/or recreational facility.
PROPOSED GRADE PLANE
A reference plane representing the average of proposed finished ground level adjoining the proposed building at exterior walls. Where the finished ground level slopes away from the exterior walls, the reference plane shall be established by the lowest points within the area between the building and the lot line or, where the lot line is more than six (6) feet (1,829 mm) from the building, between the building and a point six (6) feet (1,829 mm) from the building.
RETAINING WALL HEIGHT
Retaining wall height shall be measured from the base of the footing to the top of the wall.