The following provisions apply to critical digital infrastructure facilities.
(1) The critical digital infrastructure use is established to provide a location for facilities consisting of one or more buildings used primarily for the storage, management, processing, and transmission of digital data, which houses computer and/or network equipment, systems, servers, appliances, and other associated components related to digital data operations.
(1) Critical digital infrastructure use may be established only where:
(a) The tract of land where the critical digital infrastructure use is proposed has a zoning designation of Limited Industrial (LI) or General Industrial (GI);
(b) The tract of land where the Critical Digital Infrastructure use is proposed is within the Critical Digital Infrastructure Overlay Zone (CDI-OZ); and
(c) Critical digital infrastructure may only be established on a tract of land that abuts land that is zoned residential or is designated residential on the Comprehensive Plan Land Use map if the front, side, and rear yard setbacks set forth in § 1-19-6.100 for a critical digital infrastructure facility are increased to 500 feet from any property line abutting such residentially zoned or designated land.
(2) The tract of land proposed to be utilized for a critical digital infrastructure use may not be located within a priority preservation area (PPA), a rural legacy area (RLA), or a treasured landscape management area.
(3) The tract of land proposed to be utilized for a critical digital infrastructure use may not have a designation of no planned service (NPS) in the Frederick County Water and Sewerage Plan.
(4) Additional size and location criteria. Applicants must demonstrate that:
(a) The visual impact of the project on the viewshed, surrounding properties, public roadways, including roadways with rustic, scenic, or historic designation, and historic sites will be avoided or minimized to the maximum extent practicable;
(b) Schools, college and universities, daycare centers, health care facilities, houses of worship, residences, and other non-industrial uses in the vicinity have been identified and negative impacts to these uses will be avoided or minimized to the maximum extent practicable;
(c) Fragile ecosystems and watersheds in the vicinity have been identified, and negative impacts will be avoided or minimized to the maximum extent practicable;
(d) Negative impacts to local, state, and federal recreational amenities and private parks, as defined in § 1-19-11.100, will be avoided or minimized to the maximum extent practicable; and
(e) The siting of the proposed use(s) will not have a negative impact that disproportionately affects overburdened communities or underserved communities as those terms are defined in Md. Code Ann., Environmental Article, § 1-701.
(1) The Planning Commission may approve a reduction to, but not elimination of, the required yard setbacks in § 1-19-6.100 between adjoining critical digital infrastructure facilities during the site plan review process, if the Planning Commission finds that reducing the setbacks:
(a) Increases the size and usability of open space areas;
(b) Increases the landscape buffer areas along other adjacent property lines with different land uses;
(c) Provides additional buffer areas for environmentally sensitive areas or resources; or
(d) Facilitates compliance with the design criteria listed under § 1-19-8.402(B).
(2) Notwithstanding any reduction approved by the Planning Commission, the distance between structures must comply with applicable building code requirements.
(1) Buildings must be predominantly designed and constructed to include finishes and materials of consistent quality and design on all sides. All building facades that are in public view must avoid the use of undifferentiated facades and long, plain wall sections by including a combination of the following design elements: change in building height, building step-backs or recesses, windows, doors, changes in building material, patterns, textures, colors, or use of accent materials. Architectural renderings or plans must be submitted as part of the site development plan application for approval by staff and the Planning Commission to assure that the appearance, type of building materials, or other aspects of the building are consistent with the purposes and intent of the critical digital infrastructure design requirements.
(2) Visual impacts of the critical digital infrastructure on designated preservation areas, such as rural legacy areas, agricultural preservation areas, critical farms, Monocacy scenic river, designated heritage areas, historic sites, and sites eligible for historic designation, must be avoided or minimized to the maximum extent practicable. A viewshed analysis must be submitted as part of the site development plan application for approval by staff and the Planning Commission to assure that visual impacts are avoided or minimized to the maximum extent practicable through such means as building placement, building materials, landscaping, and screening.
(3) Building entrances must be designed and oriented in terms of their relationship to the human scale and must reflect this relationship through the inclusion of human-scaled architectural elements.
(4) Refuse and recycling dumpsters, service doors, and mechanical equipment must face away from roadways, pedestrian routes, and public areas.
(5) In order to minimize visibility from adjacent roads and adjacent properties, ground level and roof top mechanical and electrical equipment, power generators, water cooling and storage facilities, utility substations, and other associated utility infrastructure to support sustained operations of the infrastructure must be screened. This screening may be provided by a principal building. Mechanical and electrical equipment not screened by a principal building must be screened by a visually opaque fence, screen wall or panel, parapet wall, or other visually opaque screen that must be constructed of materials compatible with those used in the exterior architectural finishes of the principal building.
(6) Staff shall refer site plans to the Architectural Review Committee, if the committee exists in good standing, for review prior to the site plan being scheduled for Planning Commission. The recommendations of the Architectural Review Committee may be considered by the Planning Commission.
(7) In addition to meeting the requirements of § 1-19-6.400, the following landscaping, screening, and buffering requirements must be met.
(a) Front yard(s) abutting a roadway must include a landscaped buffer.
(b) Except where adjoining a critical digital infrastructure use, side and rear yards must include a landscaped buffer.
(c) A landscaped buffer must include a four-season visual screen resulting in multi-layered, staggered rows of overstory and understory trees and shrubs that are a mix of evergreen and deciduous vegetation, with an emphasis on species that are native to Frederick County.
(d) The minimum height of overstory trees within a landscape screen or buffer at planting must be a minimum of 6 feet with a minimum caliper of 2 inches. The minimum height of understory trees and shrubs at the time of planting must be 3 gallon or larger. Trees and shrubs larger than the minimum sizes listed above will be required where the minimum planting sizes will not provide adequate screening or buffering within 2 years. Vegetation used to establish a visual screen shall not be trimmed so as to stunt upward and outward growth or to otherwise limit the effectiveness of the visual screen.
(e) A berm, wall, or fence may be used in combination with vegetation to satisfy the screening requirement where deemed appropriate by County Staff and the Planning Commission. Walls and fences must be made of quality materials and enhance rather than detract from the beautification of the site. Walls and fences that are in public view must avoid long, undifferentiated facades and long, plain sections by including a combination of the following design elements: variations in height, step-backs or recesses, changes in material, patterns, textures, colors, or use of accent materials.
(f) If security fencing is proposed, vegetative screening must be placed between the fence and the public view. Fencing must be made of high quality materials. Chain-link and similar woven metal or plastic fencing shall not be used.
(g) If forest or hedgerows exist where screening or buffering is required, it must be preserved to the maximum extent practicable and supplemented with new plantings where necessary to provide the desired screening or buffering.
(h) All landscaping, screening, and buffering must be maintained in living condition.
(i) Applicant must submit a landscape, buffering, and screening plan as part of the site plan application addressing the requirements and timing of plantings. Screening and buffering must be installed as early in the development process as possible. Occupancy shall not be granted if screening and buffering requirements are not installed in accordance with the approved site plan.
(j) The Planning Commission may approve a modification to the landscaping, buffering, and screening standards where an alternate landscaping, buffering, and screening plan is provided that meets the purpose and intent of these design requirements.
(8) Parking, loading, and signage must be provided in accordance with § 1-19-6.200 through § 1-19-6.340.
(9) In addition to meeting the requirements of § 1-19-6.500, the following lighting requirements must be met:
(a) Pole mounted and building mounted lights must not exceed a height of 18 feet.
(b) Lighting shall include elements that reduce negative impacts to wildlife migration, nocturnal habits, and circadian rhythms, such as the utilization of lights with amber or yellow tints instead of blue or white light and the use of timers, motion detectors, and light-sensitive switches to actively regulate the emission of light from light fixtures.
(c) The Planning Commission may require more restrictive lighting standards where deemed appropriate by the Planning Commission.
(10) Bicycle rack requirements shall be in accordance with industrial parks in table § 1-19-6.220 (H)(1).
(11) Critical digital infrastructure facilities must meet all criteria found in §§ 1-19-7.600 and 1-19-7.610.
(E) Subdivision and street frontage.
(1) Subdivision of lot(s) for critical digital infrastructure uses shall comply with Chapter 1-16 of the County Code.
(2) Where two or more lots are proposed for critical digital infrastructure uses, the lot frontage requirement of § 1-19-4.520 may be met by construction of a private street subject to Planning Commission approval and the following:
(a) The lot or parcel from which the new lot is being created has fee-simple frontage on a public street.
(b) The private street connects directly to a public road.
(c) The private street will not serve any uses that would be frequented by the general public.
(d) For the purposes of establishing bulk regulations (setbacks, lot width, etc.), the measurements along the portion of the lot(s) fronting a private street must be the same as established for public streets.
(e) The design of the private street must comply with Chapter 1-16 of the County Code.
(f) Private streets may not create long, dead-end street networks and must serve a limited number of lots and sites, as determined by the Planning Commission.
(g) Private streets must be maintained by a property owner association or similar organization.
(h) Easements, maintenance agreements, and covenants must be provided to the County for review with the submission of a final plat, and must be recorded by the applicant prior to lot recordation and the recording reference noted on the final plat.
(F) Performance standards. These performance standards for critical digital infrastructure facilities are intended to mitigate potential detrimental effects on adjacent properties and the neighborhood. All applications for site plan approval must be accompanied by a registered engineer's certification that the use complies with all of the performance standards. If, after occupancy of the structures, continuous or frequent (even if intermittent) violations of the performance standards occur, and after notice is given, bona fide and immediate corrective work is not performed which successfully prevents the violation(s) from reoccurring, the Zoning Administrator may suspend or revoke the Zoning Certificate and the Certificate of Occupancy and require the operations and occupancy to immediately cease. The Zoning Certificate and Certificate of Occupancy will be reinstated after the property owner demonstrates to the Zoning Administrator's satisfaction, that operation of the facilities is able to conform to these requirements.
(a) Noise must be measured with a sound level meter.
(b) The maximum sound pressure levels permitted from any source, including but not limited to electrical equipment, air handlers, generators, and other mechanical devices, measured within an adjacent property line, are set forth below:
(c) All applications for site plan approval must include a sound study that is prepared by a qualified engineer with experience in environmental acoustics. The purpose of the detailed study is to assess the impact of all noise sources and determine the appropriate layout, design, and control measures. The study must include:
1. Details of assessment methodology.
2. List of all air handlers, generators, and other mechanical devices that are included in the sound evaluation, including manufactures specifications.
3. Predicted sound levels for three scenarios:
a. All mechanical and electrical equipment required for normal operation at 100% load.
b. Generator testing and maintenance.
c. Emergency scenario with all generators, mechanical equipment, and electrical equipment operating at 100%.
4. When multiple buildings are proposed on the site plan application, the study must include sound levels for each phase of building construction to ensure that the sound levels listed in the table in (F)(1)(b) above are met during all phases of buildout.
5. Summary of the results and recommended control measures.
(d) Within 6 months of the date of occupancy of any completed CDI building, and biennially thereafter, actual sound levels for scenarios a and b listed under (F)(1)(c)(3). above must be measured by a qualified engineer with experience in environmental acoustics and a final sound level report must be submitted to the county for review and approval. If actual sound levels exceed the maximum sound pressure levels listed in (F)(1)(b) above, corrective actions must be executed as soon as reasonably possible, but no later than 180 days from the date of the submission of the report.
(e) The provisions of this section do not apply to:
1. Transportation vehicles not under the control of the use.
2. Occasionally used safety signals, warning devices, and emergency pressure relief valves.
3. Temporary construction activity between 7:00 a.m. and 7:00 p.m.
4. Emergency and other exemptions identified in § 1-11-6(F).
(a) No vibration may be produced which is transmitted through the ground and is discernible without the aid of instruments at any point beyond the property line; nor may any vibration produce a particle velocity of 2 inches per second measured at or beyond the property line. This provision does not apply between adjoining critical digital infrastructure facilities uses.
(b) All applications for site plan approval must include a vibration impact study that is prepared by a qualified individual with experience in vibration analysis.
(c) Within 6 months of the date of occupancy of any completed CDI building, and biennially thereafter actual vibration levels must be measured by a qualified individual and a vibration report must be submitted to the County for review and approval. If vibration levels exceed the maximum listed in (F)(2)(a) above, corrective action must be taken as soon as reasonably possible but no later than 180 days from the date of the submission of the report.
(a) Generators must meet or exceed Tier 4 or equivalent emission standards as defined by the United States Environmental Protection Agency.
(b) Generator testing shall be limited to Monday through Friday, 8:00 a.m. to 5:00 p.m. Only one generator per building, or the minimum number necessary to meet operational standards, may be tested at a time and for a period not to exceed 60 minutes, unless federal or state law, rule or regulation, or utility company restrictions prevent testing during such time.
(c) Generators must be installed at ground level.
(d) Stand-alone fuel storage tanks.
1. For the purposes of this section, fuel storage includes the storage of all petroleum bases fuels, natural gas liquids, biofuels, and liquids derived from other hyrdocarbon sources.
2. The storage tank shall be placed above ground with a capacity not to exceed 20,000 gallons.
3. Only one storage tank is permitted per critical digital infrastructure building.
4. The storage tank shall be located a minimum of 100 feet from a well or as provided in § 1-6-50 of the County Code (Wellhead Protection Ordinance), whichever is greater.
5. The storage tank shall be governed by the International Fuel Gas Code concerning storage tanks, and the National Fire Protection Association 30 standards.
6. Storage tanks shall have 100% catchment basin, or double-walled containment, and a spill protection overfill alarm.
7. Shall comply with § 1-6-50 of the County Code (Wellhead Protection Ordinance).
8. The storage tank must have a minimum setback of 100 feet from all property lines.
9. Storage tanks must meet all applicable state and federal regulations for above ground storage tanks.
(e) Fuel storage tanks attached to stationary equipment:
1. For the purposes of this section, fuel storage includes the storage of all petroleum bases fuels, natural gas liquids, biofuels, and liquids derived from other hydrocarbon sources.
2. Shall not have a capacity greater than 10,000 gallons per attached storage tank.
3. The storage tank and stationary equipment shall be located a minimum of 100 feet from a well or as provided in § 1-6-50 of the County Code (Wellhead Protection Ordinance), whichever is greater.
4. The storage tank shall be governed by the International Building Code 2006 as amended concerning storage tanks, and the National Fire Protection Association 30, as amended.
5. Storage tanks shall have 100% catchment basin, or double-walled containment, and a spill protection overfill alarm.
6. Shall comply with § 1-6-50 of the County Code (Wellhead Protection Ordinance).
7. The storage tank must have a minimum setback of 100 feet from all property lines.
8. Storage tanks must meet all applicable State of Maryland and federal regulations for above ground storage tanks.
(Bill No. 22-05, 3-15-2022; Bill No. 25-05, 5-20-2025; Bill No. 25-09, 9-2-2025)