ESBD_492724_1774357942554_Attachment B - Preliminary HDR Design Narrative.pdf

Schematic Design

Hays Co. East Side Campus Building

Enter Project Description or Caption

Hays Couty, Texas

March 6, 2026

Preliminary

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TABLE OF CONTENTS

1 CHAPTER 1 INTRODUCTION

1.1 BACKGROUND

1.1.1 Purpose and Scope

1.1.2 Applicability

1.1.3 General building requirements

1.1.4 Sustainability

2 CHAPTER 2 TECHNICAL REQUIREMENTS

2.1 CIVIL/UTILITIES DESIGN

2.1.1 Codes and Standards

2.1.2 General

2.1.3 Grading and Drainage

2.1.4 Pavement and Parking

2.1.5 Environmental Permitting

2.1.6 Sustainability Features

2.2 LANDSCAPE ARCHITECTURE DESIGN

2.2.1 Codes and Standards

2.2.2 General

2.2.3 Planting

2.2.4 Irrigation

2.3 STRUCTURAL DESIGN

2.3.1 Codes and Standards

2.3.2 General

2.3.3 Structural Materials

2.3.4 Foundations

2.3.5 Ground Level Slab Floor Systems

2.3.6 Superstructure

2.4 ARCHITECTURAL DESIGN

2.4.1 Codes and Standards

2.4.2 General

2.4.3 Planning Considerations

2.4.4 Exterior Envelope

2.4.5 Interior Design

2.4.6 Sustainability Features

2.5 PLUMBING

2.5.1 Codes and Standards

2.5.2 Plumbing Fixtures

2.5.3 Domestic Water Service

2.5.4 Booster Pump

2.5.5 Electric Water Heaters

2.5.6 Domestic Water Piping

2.5.7 Storm Sewer, Sanitary Sewer, Waste, and Vent Piping

2.5.8 Piping Insulation

2.5.9 Elevator Sump Drainage

2.6 MECHANICAL DESIGN

2.6.1 Codes and Standards

2.6.2 General

2.6.3 Design Conditions

2.6.4 Main Mechanical System Options

2.6.5 Auxiliary Mechanical Systems

2.6.6 Exhaust Fans

2.6.7 Mechanical Piping

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2.6.8 Ductwork

2.6.9 Insulation of Mechanical Systems

2.7 ELECTRICAL DESIGN

2.7.1 Codes and Standards

2.7.2 General

2.7.3 Design Loads

2.7.4 Electrical Power Distribution

2.7.5 Electrical Interior Power

2.7.6 Electrical Lighting

2.7.7 Grounding & Lightning Protection

2.7.8 Reliability Approach

2.7.9 Sustainability Features

2.8 FIRE PROTECTION DESIGN

2.8.1 Codes and Standards

2.8.2 General

2.8.3 Site Fire Water Design

2.8.4 Fire Sprinkler System Design

2.8.5 Standpipe System Design

2.9 FIRE ALARM DESIGN

2.9.1 Codes and Standards

2.9.2 General

2.9.3 Fire Alarm System Design

2.10 LIFE SAFETY

2.10.1 General

2.10.2 Occupancy Classification

2.10.3 Building Height and Area

2.10.4 Means of Egress

2.11 TELECOMMUNICATIONS DESIGN

2.11.1 Codes and Standards

2.11.2 General

2.11.3 Telecommunications System Design Approach

2.12 SECURITY DESIGN

2.12.1 Codes and Standards

2.12.2 General

2.12.3 Access Control System (ACS)

2.12.4 Video Surveillance System (VSS)

2.13 AUDIO VISUAL DESIGN

2.14 WAYFINDING

2.14.1 Codes and Standards

2.14.2 General

2.14.3 Exterior Signage

2.14.4 Interior Signage

3 APPENDIX A

3.1 SCHEMATIC DESIGN DRAWINGS

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1 CHAPTER 1 INTRODUCTION

1.1 BACKGROUND

This document represents the Schematic Design narrative for the Hays County Eastside administration building. This project is a culmination of programming regional facilities to help Hays

County identify where services need to be relocated and/or expanded to provide better service the growing community.

1.1.1 Purpose and Scope

The Hays County Eastside facility is a relocation and expansion of county services for the growing population in Hays County in Precinct 1 and 2. This new 78,732 GSF three-story timber building will house the following departments (Tax Office, Elections, Juvenile Probation, Adult Probation, Justice of the Peace, Constable, Sheriff’s Office, Emergency Management, County Clerk, Commissioners Offices, County Administrator, Development Services, Purchasing, Budget, HR, Auditor, CWOP, Local Health, IT, Veteran Services and Staff Support that includes a staff amenity rooftop patio of

1,970 GSF).

This new facility is an opportunity to expand in Kyle, Texas and support two precincts. This county expansion would add to the Hays County civic buildings that includes a historic courthouse and a government center in San Marcos.

As leadership mapped out a plan for short-term and long-term facility improvements, the goal was to better serve its community’s current and future needs by providing county services East of the I-35 corridor. This plan sets up a series of priorities that would drive Hays County Eastside’s architectural identity.

• Provide a clear Hays County civic building presence to the public.

• A lobby that becomes the community living room for gatherings

• Architectural solutions and assemblies that would allow for future expansion.

• Design for a projected ten year of growth within the proposed architecture.

• Establish a clear public path between entries and services that is visible to the community and enhances direct daylight to public lobbies and visual transparency to outdoor landscaping.

Any Hays County facility created for the delivery of public services should be viewed as a container for the crucial activities within the County. Its goal is to safeguard the public and staff; promote efficiency and effectiveness for all that inhabit its spaces. And ideally, it does so in an environment that improves the experiences of everyone that spends time within its walls. A successful facility can serve as a magnet for the community and a recruiting tool for future employees.

The HDR team has strived to fully understand the operations and aspirations of Hays County in crafting the proposed facility. Complementing this, the HDR designers, architects, and engineers have applied well-tested design solutions that reflect best practice within the industry for the Eastside campus facility.

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1.1.2 Applicability

This Schematic Narrative document is supplemental to the Schematic Design Drawings set submitted.

1.1.3 General building requirements

The project is designed in accordance with the following codes and standards as adopted by the City of Kyle, TX. Adopting Ordinance Chapter 8, Article II Technical Codes:

• International Code Council (ICC) 2021 International Building Code (IBC)

• ICC 2021 International Plumbing Code (IPC)

• ICC 2021 International Mechanical Cde (IMC)

• ICC 2021 International Fuel Gas Code (IFGC)

• ICC 2021 International Fire Code (IFC)

• ICC 2021 International Energy Conservation Code (IECC)

• 2020 National Fire Protection Association (NFPA) 70 National Electrical Code (NEC)

1.1.4 Sustainability

To address sustainability the building will incorporate the following:

• Modeling studies to review glare and daylighting strategies for its glass systems.

• Energy modeling will also be implemented at the beginning of design development to optimize mechanical and electrical systems for this facility.

• The building also utilizes timber and CLT technology to help reduce the carbon footprint and provide a healthy environment.

• Landscape designed to maintain low water usage.

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2 CHAPTER 2 TECHNICAL REQUIREMENTS

2.1 CIVIL/UTILITIES DESIGN

2.1.1 Codes and Standards

Civil engineering design of site-specific improvements, stormwater management, and on-site and off-site infrastructure shall conform to the City of Kyle Code of Ordinances and the City of Kyle

Drainage Design Criteria.

2.1.2 General

Civil engineering design will include site connectivity through parking lots, drive aisles, and pedestrian sidewalk, grading to establish positive drainage away from the proposed building and site features to a proposed stormwater collection system, design of detention pond(s) to mitigate increase in runoff, and design of utility extension to provide water and sanitary sewer service to the proposed building.

2.1.3 Grading and Drainage

The majority of the existing project site drains northeast to southwest to two 24” RCP culverts located in the southwest corner of the site. A high point runs north to south on the east half of the project site, which directs the remainder of existing site runoff to the east property boundary.

Proposed site grading will maintain existing drainage patterns, with the anticipated location of stormwater detention to be located along the western property boundary. Accessible parking and a path to the right-of-way will be designed to meet state and federal requirements. Detention will be designed such that proposed and ultimate condition runoff is equal to or less than existing runoff for the project site.

2.1.4 Pavement and Parking

Parking for the building will be divided between public parking on the south side of the building, and gated/secured employee parking on the north side of the building. ADA-accessible parking will be provided at a ratio of non-ADA parking in accordance with the Texas Accessibility Standards (TAS)

Chapter 2, Table 208.2. Concrete pavement will be designed for driveways, parking areas, main drive aisles, and loading docks based on geotechnical recommendations.

2.1.5 Environmental Permitting

Per the publicly accessible Edwards Aquifer GIS map, the project site is not located over the

Edwards Aquifer Contributing, Recharge, or Transition Zones. A Stormwater Pollution Prevention

Plan will be required, based on a limit of disturbance over 1 acres. The site is located in the Bunton

Branch-Plum Creek Watershed.

2.1.6 Sustainability Features

Civil engineering design will work in accordance with architect/landscape architect designs to achieve sustainability goals for the project site. Where applicable, low-impact development features will be utilized to achieve stormwater management needs. Rainwater catchment and storage for irrigation use will be evaluated as a potential sustainability feature.

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2.2 LANDSCAPE ARCHITECTURE DESIGN

2.2.1 Codes and Standards

Landscape and on-site infrastructure shall conform to the City of Kyle Code of Ordinances and the

City of Kyle site planning Design Criteria.

2.2.2 General

The 13.2-acre site is located between Bebee Road and Dacy Lane. The building is oriented to provide primary public access from Bebee Road, with secondary access from Dacy Lane.

Pedestrian areas surrounding the building will incorporate architectural pavers and decorative colored concrete to enhance the overall experience and visual character. An entry plaza is proposed at the main building entrance, featuring outdoor seating and integrated landscaping to create an inviting arrival space.

2.2.3 Planting

The planting plan uses drought-tolerant, native, or well adapted species suited to the City of Kyle region. New trees will have a minimum caliper of 3 inches, and no shrubs smaller than 1 gallon will be used. A dry creek feature will be incorporated into the parking lot medians to assist with stormwater management and minimize maintenance. All planting beds will be mulched with decomposed granite.

2.2.4 Irrigation

Permanent irrigation is planned for all new planting areas, though drought-tolerant plants are selected to reduce water usage. Enhanced planting areas will be concentrated around the building and in the entry plaza area.

2.3 STRUCTURAL DESIGN

2.3.1 Codes and Standards

Analysis, design, detailing, fabrication and erection of all structures shall conform to the following codes and standards, latest edition or as required by the applicable building code:

• International Building Code, 2021 Edition, as adopted by the City of Kyle, TX Adopting

Ordinance Chapter 8, Article II Technical Codes

• ACI 318-19 Building Code Requirements for Structural Concrete

• AISC 360-16 Specifications for Structural Steel Buildings

• AISI S100-16 (2020) w/ S2-20 North American Specification for the Design of Cold-Formed

Steel Structural Members, 2016 Edition (Reaffirmed 2020), with Supplement 2, 2020 Edition

• AISI S202-20 Code of Standard Practice for Cold-formed Steel Framing, 2020

• ASCE 7-16 with Supplement 1 Minimum Design Loads and Associated Criteria for Buildings and Other Structures

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• NDS-2018 National Design Specification (NDS) for Wood Construction – with 2018 NDS

Supplement

• SDPWS-2021 Special Design Provisions for Wind and Seismic

• SDI RD – 2017 Standard for Steel Roof Deck

• TMS 402-2016 Building Code for Masonry Structures

• TMS 602-2016 Specification for Masonry Structures

• WRI/CRSI-81 Design of Slab-on-ground Foundations – with 1996 Update

• ANSI 117-2015 Standard Specification for Structural Glued-Laminated Timber of Softwood

Species

• ANSI A190.1-2017 Standard for Wood Products – Structural Glued-Laminated Timber

2.3.2 General

Design Loads

Structural design load criteria was developed using site and project specific criteria. The following

“Occupancy Categories” shall be used in accordance with ASCE 7 for the determination of environmental loading.

Structure Classification:

The building contains occupancies which fall under multiple risk categories under IBC 2021 and

ASCE 7-16. RFI’s 17, 18, 19, and 20 were submitted to confirm that the building is not a designated essential facility per IBC 2021 Table 1604.5. Additionally, the building was confirmed to not require any emergency shelters. Per RFI 19 response, a risk category of II was determined to be acceptable for the entire structure.

Risk Category: II

Dead Loads:

Dead loads will be considered resulting from fixed construction, materials, and equipment. Dead loads will be determined and applied in accordance with ASCE 7-16, and other pertinent standards and vendor-supplied information. Minimum uniformly distributed floor loads include:

• 2” lightweight concrete topping = 19.2 psf

• Collateral dead load (MEP allowance, floor finish, raised floor system) = 10 psf

Live Loads

Live loads are those loads produced by the use and occupancy of the building or structure, and do not include loads such as wind/seismic loads, rain loads, flood loads, or dead loads. Minimum uniformly distributed live loads will be as required by ASCE 7-16.

• Assembly areas, Lobbies, 1st floor corridor, Stairs and exit ways = 100 psf

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• Upper Floor Corridors and Floors = 80 psf

• Mechanical/Electrical Rooms = 150 psf or as required to support actual equipment loading

• Armory/Vaults = 150 psf

• Roof = 20 psf (non-reducible). Per 16 RFI Response, the roof is not required to be designed for future photovoltaic systems.

Snow Loads

Snow loads shall be determined in accordance with IBC 2021. Minimum ground snow load shall be

11 psf for the building. Frost depth for the project site is XX inches for heated structure.

Wind Loads

The minimum 3-second gust design wind speed shall be determined using ASCE 7-16 and the

“ASCE 7 Hazard Tool website”. A basic wind speed of 109 mph (84 mph nominal wind speed) will be used for the project location.

Building risk category II, as defined by ASCE 7-16, shall be used for this building.

Exposure classification C, as defined by ASCE 7-16 shall be used for this building.

Seismic Loads

Seismic loads shall be determined in accordance with IBC 2021. The structure will be designed as

Seismic Design Category (SDC) of “A” based on the seismic parameters defined in IBC 2021. At this time, a geotechnical investigation is underway. The seismic parameters listed below will be updated based on the final geotechnical report:

• Mapped Spectral Response Parameter, SS = 0.052 g

• Mapped Spectral Response Parameter, S1 = 0.029 g

• Soil Site Classification = D (assumed)

• Design Spectral Response Parameter, SDS = 0.055 g

• Design Spectral Response Parameter, SD1 = 0.046 g

• Long-period transition period, TL = 12 sec

• Seismic Design Category = A

Load Combinations

Load combinations in accordance with ASCE 7‑16 will be used. Service‑level combinations will be applied for foundation bearing and deflection checks, and strength‑level combinations will be applied for material strength and unity checks.

Special Inspections

Special Inspections are required for this project in accordance with Chapter 17 of IBC 2021. A statement of special inspections and schedule of special inspections will be provided in the structural drawings and/or specfications at the DD deliverable.

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Structural Observations

In accordance with Section 1704.6 of IBC 2021, structural observations by a registered design professional are not required for this project since the building risk category is II.

2.3.3 Structural Materials

The following material strengths and properties will be used for design:

• Concrete minimum compressive strength (f’c):

o All concrete unless noted otherwise: 4000 psi

• Structural Steel o W-Shape Columns and Beams: A992 Fy = 50 ksi o Rectangular and Square HSS: A500 Gr C Fy = 50 ksi o Round HSS: A500 Gr B Fy = 46 ksi o Miscellaneous Plates and Shapes: A572 Gr 50 Fy = 50 ksi

• Wood o Cross Laminated Timber: V2 SPF or V3 SP o Structural Glued-Laminated Timber:

▪ Beams 24F-V8 (DF or SP)

▪ Columns L2 (DF) or N1D14 (SP)

2.3.4 Foundations

A geotechnical investigation has not been completed for this project at this time. Based on previous projects in the area, the foundation is anticipated to be shallow foundations. This section will be updated to reflect the recommendations for the geotechnical investigation when available.

2.3.5 Ground Level Slab Floor Systems

The ground-level floors are anticipated to use a reinforced concrete slab-on-grade system. The slab-on-grade will be designed in accordance with the project geotechnical report and the recommendations and requirements of ACI 302.1R-04.

Slabs-on-grade will be cast-in-place, normal-weight, reinforced concrete, with an anticipated thickness of 4 to 6 inches. Construction, contraction, and expansion joints will be provided as required. An under slab drainage and vapor barrier system will be provided beneath the slabs-on-grade to minimize moisture migration through the slab, in accordance with the geotechnical report and ACI 302.1R-04.

2.3.6 Superstructure

Gravity Load Resisting System

The gravity load resisting system will consist of mass timber construction, including three levels of

CLT floor/roof panels supported by glulam posts & beams. This configuration will serve as the typical building structure unless otherwise described in the following paragraphs.

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Optimized Column Grids

Column grids are optimized at a typical spacing of 10 feet by 30 feet, providing an efficient one-way structural system.

Main Building Framing

Typical roof and floor framing will consist of sistered glulam beams running through and bearing on the notches at columns. The columns will be continuous from roof to foundations without splices at floor levels. The floor or roof beams are 30 feet single span in the north-south direction, supporting

3-PLY CLT panels running east-west. The CLT panels will be detailed as three-span continuous members, typically.

At the center of the main roof there is a pop-up roof with a surrounding clerestory incorporated.

Glulam columns will cantilever above the main roof to support the pop-up roof framing similar to the main roof. Rooftop mechanical equipment will be screened with louvered screen wall systems fastened to the CLT roof panels.

At the center of the second floor, an opening of similar plan dimensions creates a two‑story atrium extending through the first and second floors. At the east and north sides of the second floor, the floor framing steps down to accommodate the architectural built-up assembly associated with the outdoor patio area.

The elevator core walls will consist of CLT wall panels. The stair core walls will consist of CLT wall panels at the interior and exterior cladding at the building’s perimeter.

The building will be designed for future expansion along the east side of the building. The extents of the future expansion will be further defined during the design development phase.

Pergola Framing

To the East of the third floor, a pergola structure consisting of two bays by three bays will be constructed using steel framing. Either galvanized steel with finish paint per architectural specification or weathering steel may be employed for durability considerations.

Drive-Through Canopy

To the West of the building, a steel framed drive-through canopy will be supported by isolated spread footings. A separation joint will be provided between the drive-through canopy and the main building.

Lateral Force Resisting System

The lateral force resisting system for the building will consist of CLT diaphragms for the floors and roof. The CLT diaphragms will be topped with 2” of light weight concrete. The topping slab will serve as a wearing surface and to aid with fire resistance and acoustics. The topping slab will not be relied upon to participate in the lateral force resisting system.

In addition to the CLT diaphragms, multiple LFRS configurations will be evaluated during design development to ensure optimal performance, constructability, and architectural integration. Potential systems to be studied include:

• Steel Braced Frame System: Strategically located steel braced frames may be incorporated to provide supplemental lateral stiffness, strength, and ductility where required. This system

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• Perimeter Timber Braced Frame Systems + Interior CLT Shear Walls: This option uses glulam or other mass timber members arranged as concentrically or eccentrically braced frames at the perimeter, combined with full-height interior CLT shear walls. This configuration provides an efficient structural solution while maintaining a predominantly timber architectural aesthetic.

• Timber Braced Frame Systems: Glulam or other mass timber members configured as concentrically or eccentrically braced frames will be considered as an architecturally expressive alternative to CLT shear walls, preserving an all-timber appearance where desired.

Although timber braced frames are not specifically defined as a seismic force resisting system in ASCE

7‑16, there is increasing precedent for their use in domestic and international projects. For this project, the timber bracing system will be designed using a conservative seismic response modification factor

(R = 3), consistent with “Steel Systems Not Specifically Detailed for Seismic Resistance” in ASCE

7‑16 Table 12.2‑1. End brace connections will consist of steel gusset plates and bolts. These steel components will be detailed to provide ductile behavior, allowing the timber members to remain elastic under seismic loading. If timber braced frames are selected for the project’s LFRS, a formal letter with reference projects will be submitted to the AHJ for approval.

The evaluation of these systems will consider lateral stiffness, drift control, load‑path compatibility with the CLT diaphragms, ductility and capacity‑protection requirements, and coordination with mechanical and architectural layouts. Final selection of the LFRS will be based on structural performance, cost efficiency, and architectural requirements.

2.4 ARCHITECTURAL DESIGN

2.4.1 Codes and Standards

The proposed codes and standards for the project are as indicated in Section 1-1.3 with the architectural design for the building most impacted by the IBC, the IECC and the NFPA 101.

2.4.2 General

New construction for 78,732 GSF three-story timber building with a rooftop patio of 1,970 GSF on the second level in Kyle, Texas. The building is situated on a 13.2 acres leased property from the

City of Kyle.

2.4.3 Planning Considerations

The program was organized to 10’x10’ planning module and support growth with undefined spaced located throughout the facility.

2.4.4 Exterior Envelope

Looking at a unitized wall assembly. The base wall will typically be a combination of 7/16” Omnis

Petrarch reinforced composite rain screen panels (or similar) and Pac-Clad Modular AL (or similar) metal panels with metal stud back-up support wall. The wall from outside to inside will consist of an

8mm fiber cement reinforced or metal panels (colors to be determined), 1 ½” air space, 1 ½” of mineral fiber continuous cavity insinuation over a fluid applied vaper barrier on ½” gypsum

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10 | March 6, 2026 sheathing. The 8” light gage metal studs will be filled with batt insulation with a 5/8” interior layer of gypsum wall board.

The exterior window system for the building is a high-performance aluminum system featuring a thermally broken frame. At selected building facade orientations, the wall assembly would be designed to support integral outboard sunshades at window openings in the west and south elevations.

2.4.5 Interior Design

The new building will provide an attractive and technically advanced workplace for employees. The design will incorporate natural light, light-colors and natural finishes will be used to create an inviting space to welcome staff and visitors. Low VOC materials will be used for all finishes. Environmental considerations will be incorporated including FCS certified wood, rapidly renewable and recycled content materials. Finishes with these and other LEED credit-contributing attributes will be given preference, so long as quality and durability requirements are met.

The Interior design of this project will emphasize the exposed wood mass timber structure, using lighting accents and other design elements that complement the wood finish and allow for it to become the main accent in the space. The main lobby will include a custom wood slat accent wall.

The wood will be furnished from the same mass timber manufacturer to ensure species and finish matching. The slat wall will consist of 2” thick blades and varying depth and integrated LED lighting

TBD. Refer to 3D concept views.

Flooring:

Floor finishes will be coordinated with the raised access floor system. Wet areas such as toilet rooms and housekeeping will not have raised access flooring and will be constructed with metal stud framing over the CLT with plywood subfloor, concrete board and tile finish flooring as scheduled.

The main public lobby, public waiting areas, and the staff breakroom will have factory laminated terrazzo or tile finish (by raised flooring manufacturer), along with commercial grade area rugs to visually anchor the space and improve acoustics.

Lighting, Ceiling and Acoustic Design:

Acoustic design elements will provide necessary acoustic control in an aesthetic way, especially in areas such as conference rooms and private offices. There will be integrated linear lighting between the sister beams in public and circulation areas for accent and ambient lighting. Pendant accent light fixtures will be used in main public circulation corridors. Acoustic pendants that incorporate felt will be provided in large waiting areas that have been exposed to structure ceiling design. Felt baffles with integrated lighting will be provided in conference rooms and over open workstations. All other ceilings are as shown in the drawing RCP and finish matrix. White noise systems will be provided outside private offices and conference rooms to ensure speech privacy from outside those spaces.

Acoustic transfer grilles rated at minimum 20-25dB insertion loss will be provided at all transfer grilles on the project. Refer to mechanical section 2.6 for additional information.

Acoustic felt wall covering, floor to ceiling will be provided on one wall of each office and consult room, and two walls in each conference room.

Refer to the following finish matrix for general finishes by room type. Refer to the drawing Interior

Finish Plans for more detailed room by room finishes.

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2.4.6 Sustainability Features

Our process will engage users, facilities and maintenance staff to provide an integrated solution that does not adversely impact on the mission operations. Refer to 1.1.4 Sustainability

2.5 PLUMBING

2.5.1 Codes and Standards

The plumbing design shall adhere to the following codes and standards:

• International Plumbing Code (IPC), 2021 Edition, as adopted by the City of Kyle, TX.

Adopting Ordinance Chapter 8, Article II Technical Codes

2.5.2 Plumbing Fixtures

Plumbing fixtures will be EPA WaterSense labeled and as follows:

• Sinks: stainless steel drop-in or undermount type, with manual gooseneck faucets.

• Lavatories: vitreous china undermount or wall-mount type, with automatic sensor-type faucets.

• Water closets and urinals: wall-hung flush valve type vitreous china with concealed automatic sensor-type flush valves.

• Shower fixtures: stainless steel and will include ADA accessories where required.

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Janitor closets will be equipped with precast terrazzo mop sinks with wall mounted manual utility faucets and maintenance accessories.

Floor drains, floor sinks, wall and floor cleanouts will be provided where needed for best coverage and access for maintenance. Floor drains and sinks not receiving regular effluent flow will be provided with trap seal protection devices.

Hose bibbs and freeze-proof wall/roof hydrants will be provided where necessary to aid in maintenance activities. Water connection boxes will be provided for coffee machines and ice makers.

A water cooler with an automatic bottle filler will be provided on each floor near the main restroom group and wherever else as required.

2.5.3 Domestic Water Service

Domestic water piping will be sized for anticipated usage. The service entrance will be equipped with a main shutoff valve, strainer, water meter with bypass, reduced pressure zone backflow preventer, and pressure reducing valve for the main service to the building. A second backflow preventer will provide non-potable water to outdoor permanent irrigation systems.

2.5.4 Booster Pump

The need for a domestic water booster pump system will be evaluated as the design progresses and more information is obtained. If necessary, a variable speed multi-pump system will be recommended to ensure proper water pressure is provided over the entire building's water usage profile.

2.5.5 Electric Water Heaters

Electric storage type domestic water heaters, expansion tanks, and hot water recirculation pumps will be provided to serve main restroom groups and mop sinks. Appropriate shutoff valves, check valves, and balancing valves will be provided to permit the system’s proper operation and maintenance. ASSE 1070 certified point-of-use mixing valves will be provided at all fixtures as needed for scald protection.

Single lavatories, showers, and sinks not near a restroom group will be provided with instantaneous electric water heaters installed below sinks or in adjacent cabinetry.

2.5.6 Domestic Water Piping

Above ground domestic water piping will be Type L or K hard drawn seamless copper tube with lead-free soldered joints in accordance with ASTM B88.

Underground domestic water piping will be Type K soft annealed seamless copper tube with lead-free soldered or brazed joints.

Water piping will be provided with service valves at each floor and restroom group for maintenance.

Water hammer arrestors will be installed where necessary to mitigate the effects of water hammer on the piping system.

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2.5.7 Storm Sewer, Sanitary Sewer, Waste, and Vent Piping

Drain, waste, and vent (DWV) piping will be cast-iron or polyvinyl chloride (PVC) with DWV pattern fittings. Cast-iron piping will be in accordance with ASTM 888 and ASTM A74. PVC piping will be in accordance with ASTM D2665 and ASTM D1785.

Underground cast-iron piping will utilize hub and spigot type joint connections. Aboveground cast-iron piping will utilize no-hub type connections with heavy duty rubber couplings. Underground and aboveground PVC connections will utilize solvent cement.

No PVC piping will be installed within an air distribution plenum in accordance with IMC requirements.

2.5.8 Piping Insulation

All domestic cold-water piping will be provided with cellular glass or closed-cell elastomeric insulation with an all-service jacket, self-sealing lap, and vapor barrier to prevent condensation.

Domestic hot water and hot water return will be provided with mineral fiber insulation. Lavatory drain piping will be provided with insulating covers to prevent scalding in accordance with ADA requirements.

All outdoor and indoor piping exposed within 8 feet of the finished floor will be provided with insulation and aluminum jacketing. All other indoor exposed piping will be provided with PVC jacketing.

2.5.9 Elevator Sump Drainage

Elevator pits will be provided with sump pumps and controls to evacuate water that may collect there, as required by ASME A17.1, IBC, NFPA, and other codes and regulations. Sump pump systems will be equipped with oil sensing systems if necessary to prevent discharge of hydraulic fluid into the sanitary system. Effluent discharge will be in accordance with IPC requirements.

2.6 MECHANICAL DESIGN

2.6.1 Codes and Standards

The mechanical design shall adhere to the following codes and standards:

• International Mechanical Code (IMC), 2021 Edition, as adopted by the City of Kyle, TX.

Adopting Ordinance Chapter 8, Article II Technical Codes

• International Energy Conservation Code (IECC), 2021 Edition, as adopted by the City of

Kyle, TX. Adopting Ordinance Chapter 8, Article II Technical Codes

• NFPA 90A Standard for the Installation of Air-Conditioning and Ventilating Systems, 2024

Edition.

2.6.2 General

This project involves the design of new heating, ventilation, and air conditioning systems with associated controls to serve the new mass timber building for Hays County Eastside Campus.

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2.6.3 Design Conditions

Basis for site design criteria identified below is ASHRAE Fundamentals Handbook 2025 for Outdoor

Design Conditions.

Table 2.6.3.1. Site Information

Project Location San Marcos, TX, USA

WMO Station # 722539

Elevation 597 FT

Latitude 29.891N

Longitude 97.864W

Climate Zone 2A

Source: ASHRAE Fundamentals Handbook 2025

Ambient Design Conditions

The outdoor design conditions shall be based on the 0.4 percent dry bulb (DB) and corresponding mean coincident wet bulb (MCWB) for cooling, the 0.4 percent humidity ratio (HR) and corresponding mean coincident dry bulb (MCDB) for dehumidification design conditions, and the

99.6 percent DB for heating design conditions.

Table 2.6.3.2. Outdoor Design Conditions

Design Parameter Design Condition

Cooling (DB/MCWB) 100.8 °F / 74.6 °F

Dehumidification (DP/MCDB) 77.4 °F / 81.7 °F

Heating (DB) 27.5 °F

Indoor Environmental Criteria

Indoor environmental criteria in the table below are based on typical office building conditions.

Table 2.6.3.3. Indoor Design Conditions

Space Type Summer Winter

Administrative/Office 75 °F / 55% RH max 70 °F

Mechanical/Fire Riser N/A 40 °F

Electrical 85 °F 65 °F

Telecom/AV 80 °F 65 °F

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2.6.4 Main Mechanical System Options

Two options are being evaluated for the main mechanical systems. Various considerations, including energy efficiency, aesthetic appeal, and client preference will be taken into account when recommending which design option would be best suited for this building.

Underfloor Design Option

The first design option consists of an underfloor air distribution system with multiple split system air towers installed on each floor of the building.

Primary Mechanical System Equipment

It is anticipated that two (2) or three (3) DX VRF split system air towers will be installed in the mechanical rooms of each floor, totaling six (6) to nine (9) air towers servicing the entire building. Air towers on each floor will be configured in a “stacked” fashion, with all mechanical rooms connected through a common, shared vertical chase. Each air tower will have a mixing section for outside and return air, DX cooling/heating coil, electric heating coil (if necessary), and supply fan section.

Modulating control dampers inside the unit will control outside air and return air airflows during operation. Condensate from the units will discharge into a floor drain in the mechanical room.

Each air tower will have an associated roof mounted heat pump VRF outdoor unit. The indoor and outdoor units will be connected by refrigerant piping routed through the shared chase. Heat pumps will be installed on rooftop equipment rails.

Ventilation air will be provided by two (2) or three (3) packaged rooftop DOAS in accordance with

IMC requirements. A single DOAS will serve ventilation air to stacked air towers via the shared vertical chase. The DOAS will feature a fixed-plate total-enthalpy heat exchanger for energy recovery. The heat exchanger will not have any moving parts to minimize associated maintenance items. The DOAS will also include a DX cooling/heating coil, MERV-8 and MERV-13 filters, and direct-drive EC motors. A supply fan will provide airflow through the unit and distribution ductwork to the air towers.

Air Distribution

Air distribution will be via a pressurized underfloor plenum with floor mounted VAV diffusers and perimeter troughs. Floor mounted air devices will be fully wireless and are capable of being connected to other diffusers within a space to be controlled by a single thermostat. Floor mounted trough diffusers with electric heat and fan assist will be located on the exterior perimeter of the building to provide primary heating.

Return and exhaust air grilles will be aluminum egg crate type where ceiling mounted and 35 degree deflection grilles for sidewall type. Return air path will be carefully coordinated and concealed with architectural elements wherever possible.

Considerations

This option benefits the aesthetic appeal with the concealing of systems, quiet, and extremely energy efficient. Underfloor air distribution is highly adaptable with the reconfigurability of the air devices, supporting the desire for modular configurability of the building and any future floorplan changes.

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Overhead Design Option

The second design option consists of packaged DX rooftop air handing units and single inlet VAV terminal units.

Primary Mechanical System Equipment

Three (3) DX VAV packaged rooftop units (RTUs) will be installed on the roof, one to serve each floor. Ductwork will be routed from rooftop units through a large central chase to each floor and distributed as required. Each rooftop unit will consist of an intake section, economizer, powered exhaust, MERV 8 pre-filter and MERV 13 final filter, DX cooling coil, supply fan, and condenser section with inverter scroll compressor to modulate capacity. Condensate from the units will be terminated at a floor or mop sink.

Ventilation air will be brought in through the outside air intake of each RTU and provided in accordance with IMC requirements. Modulating control dampers inside the unit will control ventilation airflow during operation.

Air Distribution

Terminal units will utilize primary air control dampers to modulate airflow with SCR controlled electric heaters to maintain space conditions. Each terminal unit will have an associated space temperature sensor.

Air distribution will be duct-mounted double deflection supply grilles, or aluminum panel face diffusers for spaces with lay-in acoustical title ceilings.

Return and exhaust air grilles will be aluminum egg crate type where ceiling mounted and 35 degree deflection grilles for sidewall type.

Considerations

This option would be cheaper than the underfloor option, but would consist of exposed mechanical equipment, pose potential noise issues in the space, and prohibit the flexibility of floorplan changes and a modular building design.

Design Recommendation

The underfloor design option is the recommended design approach.

2.6.5 Auxiliary Mechanical Systems

Ductless Mini-Split Systems

All electronic equipment rooms will be served by a high efficiency unitary ductless mini-split system consisting of an indoor evaporator unit and outdoor condensing unit. Each split system will consist of a wall mounted programmable thermostat. The indoor unit will be a ductless wall mounted unit generally located above the door of the IDF room, and the outdoor unit will be installed on equipment rails on the roof. Refrigerant piping between the indoor and outdoor units will be provided.

Condensate will be routed to the nearest mop sink or lavatory tailpiece.

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Unitary Split System

The loading dock area will be served by a unitary split system to ensure space temperature and humidity control are maintained.

Electric Heaters

Electric cabinet unit heaters and recessed ceiling panel heaters will be installed in the main entry area and exterior vestibules to maintain minimum space conditions. Suspended horizontal type unit heaters will be installed in the mechanical and fire riser rooms as required for freeze protection. Wall heaters will operate through standalone integral thermostats.

High Volume Low Speed (HVLS) Fans

HVLS fans will be installed on the roof terrace area of the building. These fans will provide circulation and cooling to the exterior space.

2.6.6 Exhaust Fans

Exhaust air from restrooms, janitor closets, and other areas will be routed back to the energy recovery unit, or in cases of remote locations, will be provided by dedicated ceiling or roof mounted fans. Associated ductwork will be carefully coordinated to minimize visibility and simplify duct systems wherever possible.

2.6.7 Mechanical Piping

Refrigerant piping will be Type ACR hard drawn seamless copper tube meeting ASTM B280. The joints will be brazed. The fittings will be wrought copper meeting ANSI B16.22. All tubing will be cleaned, dehydrated, pressurized with dry nitrogen, plugged, and tagged by the manufacturer “for refrigeration service”.

Equipment drain piping will be DWV drawn temper seamless copper drainage tube per ASTM B306 with lead-free soldered joints and fittings. Copper piping will be Type K or L hard drawn.

2.6.8 Ductwork

Ductwork will conform to SMACNA Duct Construction Standards and will have the following static pressure classifications:

Medium pressure Supply ductwork: +4 IN. WC.

Low pressure Supply ductwork: +2 IN. WC.

Outside, Exhaust, and Return ductwork: -2 IN. WC.

Ductwork will be G90 galvanized steel.

Seal Class A – Longitudinal seams and transverse joints in non-welded ductwork will be sealed.

2.6.9 Insulation of Mechanical Systems

All refrigerant piping and condensate piping insulation will be provided with cellular glass or closed-cell elastomeric insulation with an all-service jacket, self-sealing lap, and vapor barrier to prevent condensation.

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Ductwork that is concealed within walls or plenums, or exposed to the exterior will be insulated.

Interior exposed ductwork will only be insulated where required by code. Concealed ductwork will be insulated with mineral fiber wrap or elastomeric sheets with vapor barrier. Ductwork that is exposed to view or to the exterior will be provided with rigid board type insulation with aluminum jacketing.

All outdoor and indoor piping exposed within 8 feet of the finished floor will be provided with insulation and aluminum jacketing. All other indoor exposed piping will be provided with PVC jacketing.

2.7 ELECTRICAL DESIGN

2.7.1 Codes and Standards

The electrical design will adhere to the proposed codes and standards indicated in Section 1-1.3. In addition, the following codes listed below will also be followed.

• NFPA 70E Standard for Electrical Safety in the Workplace

• NFPA 110 Standard for Emergency and Standby Power Systems

• NFPA 780 Standard for the Installation of Lightning Protection Systems

• ANSI/ASME A17.1 Safety Code for Elevator and Escalators

• Illuminating Engineering Society of North America Lighting Standard (IES)

2.7.2 General

The electrical design for the Hays County East Side Campus Building includes a new electrical service by PEC Utility for the building electrical distribution system designed to serve exterior and interior power and lighting. Power will be provided for all mechanical/plumbing equipment, elevators, IDF rooms, and fire & life safety equipment. Lighting and lighting control design will comply with IECC requirements and IES recommendations.

2.7.3 Design Loads

The International Energy Conservation Code (IECC) 2021 edition and the National Electrical Code

(NEC) 2020 edition will be used to calculate design loads. Refer to preliminary load analysis for estimated electrical load assumptions.

2.7.4 Electrical Power Distribution

Electric power for the building will be served by Pedernales Electric Cooperative, Inc (PEC). A pad-mounted transformer, provided by the electrical utility, will be placed adjacent to the building and located on the northeast side in close vicinity to the main electrical room. The preliminary estimated utility transformer size is 2000kVA. Transformer size to be further confirmed and coordinated with PEC upon design development. Trenching, backfilling, sectionalized cabinets, meter socket enclosure, primary and secondary conductors and conduit, and a concrete pad for the utility owned transformer will need to be provided to establish a service with PEC. Power will be routed underground from the

PEC utility lines to the pad-mounted transformer. There are existing overhead utility lines on site that will need to be relocated during construction.

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The transformer secondary conductors will be routed from the pad-mounted transformer to the main electrical room located on the first floor via underground ductbank. The building will utilize a

480Y/277V, 3-phase, 4-wire system as the distribution voltage. A main switchboard with a main circuit breaker and ground fault protection will be provided to distribute power throughout the building to branch panelboards and dry-type transformers. The switchboard will also provide power to larger equipment including but not limited to RTUs and elevators. The preliminary rating of the main switchboard is estimated to be 2000A and will be further confirmed upon design development. In addition to the main switchboard, the main electrical room will also include 480V distribution panelboard, dry-type step-down transformer, 208Y/120V panelboard, and a 600A, 4 pole ATS.

Electrical rooms on the second and third floors will be centrally located to distribute power to lighting, receptacles, and equipment loads on each floor. A 480Y/277V panelboard, dry-type step-down transformer, and 208Y/120V transformer will be provided in each electrical room. An electrical closet will be added on the left side of the building on each floor during the design phase to house a lighting panel board to help with voltage mitigation.

For emergency backup power, a 275kW diesel generator with a minimum of 12 hours run time and a level 2 sound attenuated enclosure will be provided. Final generator size will further be confirmed during DD as loads become finalized.

The preliminary load analysis is shown in the table below. Loads provided are estimated and are subject to change upon further design coordination.

PRELIMINARY LOAD ANALYSIS

PROJECT: Hays County East Side Campus Building

GROSS AREA (S.F.) 77562

MAIN DISTRIBUTION: 480 VOLT 3 PH

TYPE VA/SF LOAD (kVA) UNIT NOTES

EQUIPMENT - 15 kVA 1

RECEPTACLES 1 78 kVA 2

LIGHTING 1.3 101 kVA 3

A/C / HEATING - 789 kVA 4

ELEVATOR - 45 kVA 5

FIRE PUMP - 50 kVA 6

SUBTOTAL 1077 kVA

15% SPARE 162 kVA

TOTAL LOAD 1238 kVA

1490 AMP

PROPOSED SERVICE SIZE

2000 kVA

2000 AMP

NOTES:

1. Load assumption for IDF Room servers, fire alarm equipment, and miscellaneous equipment.

2. W/sf per NEC Table 220.14(K)(2) (Office Building).

3. W/sf per NEC Table 220.12 (Office Building).

4. Load assumption based on preliminary HVAC load selection.

5. Load assumption based on (3) 15hp elevators.

6. Load assumption based on 50hp fire pump (if required).

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2.7.5 Electrical Interior Power

Power Metering

The main switchboard will be equipped with a digital electric meter to monitor and record electric usage data of the entire facility. In addition to the main electric meter, additional meters are required per IECC 2021 for HVAC, interior lighting, exterior lighting, plug (receptacle) loads, and other large single loads exceeding 5% of the peak connected load.

Receptacle Power

Receptacles will be provided throughout the building for general purpose use. Receptacles will be coordinated with furniture layouts to provide optimal power for users. At least 50% of all receptacles that are located in offices, conference rooms, break rooms, and similar spaces will be controlled by the local occupancy sensor to turn off when the occupant leaves the space in accordance with IECC

2021. Depending on final area finishes, receptacles and conduit may be surface mounted. This will be further coordinated during the design phase.

Elevators

Elevator power and disconnecting means will be provided in accordance with ASME A17.1 and

NEC. Elevators will be machine room-less type with electrical equipment located in the hoistway/pit.

Proper lighting and shunt-trip power will be provided as required.

Fire Pump

If a fire pump is required, further coordination will be required with PEC utility to determine if the electrical service to the building is a reliable power source to feed the fire pump. Conduit serving the fire pump will be concrete encased from the power source to the fire pump controller.

Surge Protection Devices

Surge protection devices (SPDs) will be provided at the main switchboard and all distribution panelboards to reduce the effect of incident power surges to critical equipment. SPDs will be mounted integrally to electrical equipment.

2.7.6 Electrical Lighting

Light fixture selections and controls will comply with IECC 2021 requirements and IES recommendations. Mass timber architectural features will be taken into consideration when selecting light fixtures. Depending on construction material used, light fixtures may be surface mounted or recessed. Lighting conduits may also be exposed in some areas of the building and run under the floor in other areas.

Interior Luminaires

High efficiency LED light fixtures will be used throughout the entire facility. Fixtures will be selected to provide high quality lighting as well as complement the aesthetics of the architecture.