Clark County 911 Communication Center
Posted: January 12, 2022 | Projects
In 2018 the Board of Clark County (Ohio) Commissioners contracted with McCall Sharp Architecture to create a new 911 dispatch center. The $1,730,400 renovation and addition was constructed within nine months and completed in January 2021. Located on a secluded, former county-owned site to maintain a low profile from possible terrorist threats, this project combined several different 911 dispatch centers in Clark County into a single cohesive operation.
Photo Courtesy of Stephen L. Sharp, FAIA
Renovations to the 1979 building included transforming the 3,600-square-foot kitchen and dining hall into a 20-person training and conference room, break room, offices, decompression room, and restrooms for the facility. The only remnants of the original 1979 building are the concrete block walls, roof bar joists, and metal deck.
The new 3,000-square-foot addition houses the dispatch center, which is built to ICC 500 requirements for a tornado shelter as well as FEMA, NFPA, and NEMA codes and standards. The addition consists of a 14-console dispatch floor with a computer and server room, all on 18-inch-tall, raised computer flooring. Concrete filled raised flooring is by Tate Access Floors, and is rated at 1,000 PSF and 1,250 PSF.
Overhead, the dispatch supply ductwork runs exposed with return air venting through the raised floor in the server room. Dispatch consoles have their own built-in individual heating and cooling systems for each work station. The new HVAC for the existing building consists of high efficiency gas-fired furnaces with outdoor air conditioner condensing unit split systems, replacing the existing gas-fired boiler and heating system. HVAC for the addition consists of two packaged gas-fired heating, electric cooling units mounted on grade to guard against rooftop units being damaged by high winds. Units include air economizer systems to utilize up to 100% outdoor air for cooling when ambient air conditions allow. One unit will be active and one unit will be a redundant backup system. Control systems will alternate between active and back-up for even wear on equipment.
The server room can handle a rack for each 5' by 5' floor area and accommodates six 2-post cabinets and five 4-post cabinets. Two separate Liebert units control the server room air conditioning. An automatic sprinkler system is not required in the facility. However, the server room has an FM 200 clean agent fire system operating on a delay.
Two emergency generators, one being redundant, provide uninterrupted power. The County also provided two independent uninterrupted power systems. Separately, the County also installed a mono-pole radio antenna and ice bridge. IP communications, call center equipment and furniture, and the security system were also provided by the County.
The site required special solutions beyond the standard stormwater detention basin. The vehicular access driveway was designed with two 90-degree turns to slow traffic and make fence crashing more difficult. Normal access is gained with badge entry at the sliding gate. Additionally, the perimeter security fence is over 82 feet from the building, which minimizes damage from terrorist car bomb detonation. A separate, more direct, delivery access, but far less visible, is accomplished with Unilock Turfstone pavers seeded to blend with the lawn. In addition to the perimeter fence distance to the building, the new exterior walls are 10"-thick concrete block with reinforcing steel in every core grouted solid. Distance and mass help provide a secure work space.
The exterior building fenestration was challenging. The dated metal standing seam mansard roof was removed. The masonry wall, now exposed, set the new building height for both original and new construction. The low height of the 1979 building dictated the new addition have exposed bar joists and metal roof deck so that the height of the dispatch room would not feel oppressively low. Dispatch lighting was achieved with up and down cable suspended lighting, and Armstrong Lyra direct-apply ceiling panels were adhered to the metal deck, which dramatically improved acoustics.
The EIFS clad building wall envelope is a result of budgetary constraints and a desire to improve insulation values. The EIFS color palette was used to blend the original stone and brick surfaces with the new surfaces visually across the horizontal banded front wall. Additionally, five linear Storm Defender windows were inserted in the north wall to provide much desired high north light. These windows are capable of withstanding the impact of a 2" by 4" stud traveling at 100 mph.
The most challenging aspect, though, was creating a membrane roof capable of surviving a three-second 250 mph wind gust. The solution was to pour a 6" concrete slab on the new composite metal deck. Duro-Last Duro-Guard ISO II was adhered, Securock Glass-mat roof board adhered, and finally, Duro-last Duro-Fleece 60 mil membrane adhered. This system survived the pull test by a wide margin.
This unassuming call center delivers a state-of-the-art communications center that will be viable for decades.
McCall Sharp Architecture
14 East Main Street, #201
Springfield, Ohio 45502
Eeman and Blinn
6037 Frantz Road, #130
Dublin, Ohio 43017
Plumbing, Mechanical, Electrical Engineer
2071 N. Bechtle Ave. #205
Springfield, Ohio 45504
Harral and Stevenson
20 S. Limestone Street, #10
Springfield, Ohio 45502
Brumbaugh Construction, Inc.
P.O. Box 309
Arcanum, Ohio 45304
Location: Springfield, Ohio
Date Bid: Apr 2020
Construction Period: Apr 2020 to Mar 2021
Total Square Feet: 6,600
Building Sizes: Renovation, 3,600; addition, 3,000; total, 6,600 square feet.
Building Height: 13'9"
Number of Buildings: One.
Basic Construction Type: Addition/Renovation.
Exterior Walls: CMU, EIFS.
Floors: Concrete, access flooring.
Interior Walls: Metal stud drywall.