C19055066 BOD.pdf

USCG BASE ELIZABETH CITY

STRUCTURAL INSPECTION AND EVALUATION OF

RESCUE SWIMMERS POOL ROOM IN BUILDING

#3

USCG BASE

ELIZABETH CITY

REPAIR OF

RESCUE SWIMMER

TRAINING FACILITY

BLDG #3

UNITED STATES COAST GUARD

SITE VISIT AND BASIS OF DESIGN REPORT

USCG BASE ELIZABETH CITY, NC

USCG CONTRACT 70Z05018DBERBAM04,

TASK ORDER 70Z08322FABCD0006

PROJECT NO.: 31800149.008

DATE: AUGUST, 2022

WSP USA SOLUTIONS, INC.

Evan Amorgianos, P.E.

Civil Engineer, Design Team Alpha U.S. Coast Guard Civil Engineering Unit, Cleveland

Subject: BLDG 3 SITE VISIT AND BASIS OF DESIGN

REPORT

USCG BASE ELIZABETH CITY, NC

USCG CONTRACT 70Z05018DBERBAM04,

TASK ORDER 70Z08322FABCD0006

Dear Mr. Amorgianos:

As requested by your task order referenced above, please find our draft report attached for your review.

Yours sincerely, Robert Maslyn, RA Project Manager

Encl.

cc:

WSP ref.: 31800149.008

L I S T O F P R E P A R E R S , A G E N C I E S , A N D P E R S O N S C O N T A C T E D

CLIENT

Contracting Officer James Dinda

Contracting Specialist

Valerie J. Varga, CEU Cleveland

Project Manager Evan Amorgianos, P.E., CEU Cleveland

WSP

Contract Manager Guy Mallozzi

Project Manager Robert Maslyn, RA

Structural Engineer Weiying (Shirley) Chiang, PE, Matthew Wilde, PE, SE

Architect Drew Hudson

SUBCONSULTANTS

Cost Estimating Dennis Teschlog – ProDims

MEP and FP PACE Collaborative

Pool Consultant Aquatic Design

L I S T O F A C R O N Y M S

A/E Architectural and Engineering PCI Present Concrete Institute

CG Coast Guard PSF Pounds Per Square Feet

CL Centerline PSI Pounds Per Square Inch

CMU Concrete Masonry Unit ROM Rough Order of Magnitude

DT Double Tee (Precast Concrete) RS Rescue Swimmer

FP Fire Protection RSTF Rescue Swimmers Training Facility ft Foot, Feet SOG Slab on Grade

GWB Gypsum Wall Board SOW Scope of Work (from USCG) in Inch, inches UMET Underwater Modular Egress Training

KSI

Thousand Pounds Per Square Inch

USCG United States Coast Guard

MEP Mechanical, Electrical, Plumbing UV Ultraviolet

MPH Miles Per Hour VFD Variable Frequency Drive

OC

On Center (center to center spacing)

WSP WSP USA Inc.

Site Visit and Basis of Design Report USCG Base Elizabeth City Repair of Rescue Swimmer Training Facility Bldg #3

August 2022

Page i

TABLE OF CONTENTS

1 GENERAL DESCRIPTION

1.1 EXECUTIVE SUMMARY

1.2 EXISTING CONDITIONS

1.3 PROJECT DESCRIPTION

1.4 DESIGN CRITERIA

2 DESIGN REQUIREMENTS AND PROVISIONS

2.1 STRUCTURAL

2.2 RESCUE SWIMMERS TRAINING POOL

2.3 ARCHITECTURAL

2.4 MECHANICAL

2.5 ELECTRICAL

2.6 FIRE PROTECTION

3 DESIGN DELIVERABLE

3.1 LIST OF SPECIFICATIONS

3.2 DRAFT LIST OF DRAWINGS

Page ii

APPENDICES

APPENDIX A: PHOTOS STRUCTURAL

APPENDIX B: PHOTOS ARCHITECTURAL

APPENDIX C: GEOTECHNICAL REPORT – TO FOLLOW UPON COMPLETION OF FIELD/INVESTIGATIONS AND

TESTING. FINAL INVESTIGATIONS TO BE COMPLETED THE WEEK OF AUGUST 15, 2022

APPENDIX D: REPAIR POOL LEAK AT BLDG. 3

APPENDIX E: AQUATIC CUTSHEETS

APPENDIX F: STRUCTURAL CALCULATIONS

1 GENERAL DESCRIPTION

EXECUTIVE SUMMARY

This document presents the records of site observations by the design team, meetings between the design team and owner\user of USCG, the scope for the consulting team and the basis of design.

On April 24, 2022, the consulting (design) team led by WSP project manager, comprised of an architect, structural engineers, MEP engineers and pool specialist was on site, had a kick-off meeting with USCG project manager, user and maintenance staff. The meeting reached understandings on user’s needs and designers’ possible solutions. After the kickoff meeting, the group had a joint touring of Building #3 to document the existing conditions. Extensive discussions took place with CG staff to fully understand the pool related problems and operational issues that led to the Scope of Work (SOW) list.

Additional site investigations were conducted in the later days by MEP engineers. Geotechnical borings and report are in progress currently.

EXISTING CONDITIONS

The major component of Building #3 is the Rescue Swimmers Training Pool and its support facilities. The roof structure over the pool room (110 feet wide, 196 feet long, 25 feet high) and the south load bearing walls are widely damaged resulting from the vibration of the wave generating apparatus which is connected to the building structural system. A full investigation report on this subject has been submitted on November 2, 2021, as per USCG contract 70Z05018DBERBAM04, task order 70Z08321FPCR05500. The entire Building #3 is currently closed for occupancy due to the unsafe condition. However, the roof structure in the RS Pool room has been stabilized with a temporary shoring system per the engineering recommendation. The shoring design and installation is SOW 1.1.1. The fore-mentioned site investigation was conducted after the shoring system was complete and approved by the design engineer.

Problems with the RS Pool’s piping systems and subsurface fill have prevented the pool’s full function. An investigation report on this subject is in a report prepared by GMHill as per USCG contract 70Z08319CPR02800. More findings on the existing condition of the RS Pool are presented in the following chapter.

The existing condition of mechanical and electrical system is addressed in the following chapter more extensively.

The structural condition of the entire Building #3, beyond the RS Pool area was evaluated by a walk-through. Its finding will be discussed in the following chapter.

Reporting of existing condition of Building #3 by all disciplines is per SOW 1.1.2.

PROJECT DESCRIPTION

The objective of this project is to rebuild the roof structure of the RS Pool room with proper engineering to prevent adverse effect from the wave generating operation. The demolition\construction of the structure leads to the removal, evaluation and rebuilding of the associated MEP system.

The piping system of the RS Pool will be restored to full capacity. The pool deck will also be rebuilt to provide proper drainage. Several construction tasks will improve the operation\maintenance of both RS and UMET Pools.

Detailed discussions by each discipline are presented in the following chapters\sections.

DESIGN CRITERIA

The following is the major design standards for each discipline.

STRUCTURAL DESIGN CRITERIA

• UFC 3-301-01 – Unified Facilities Criteria Structural Engineering Last Updated November 1, 2018

• IBC 2018 – International Code Council, International Building Code 2018

• ASCE 7-16 – American Society Of Civil Engineers, 2016, Minimum Design Loads For Buildings And Other Structures

• AISC - American Institute Of Steel Construction, Manual Of Steel Construction, Fourteenth Edition

• ACI 318-14 – American Concrete Institute, 2014, Building Code Requirements For Structural Concrete And Commentary

• ANSI/SDC RD – 2010, Steel Deck Institute, 2010, Standard For Steel Deck

• PCI - Design Handbook, Precast Concrete Institute, Seventh Edition (2010)

POOL DESIGN CRITERIA

• Regulations of the Department of Health of the State of North Carolina

• ISPSC (2015) International Swimming Pool and Spa Code

• MAHC (2018) Model Aquatic Health Code

• The Association Of Pool And Spa Professionals (2014) National Standard for Public Swimming Pools

• UFC 1-200-01 (11-01-2018) DoD Building Code, With Change 2

• UFC 3-301-01 (11-01-2018) Structural Engineering, With Change 4

• UFC 4-750-07 (04-20-2020) Recreational Aquatic Facilities

• Department Of The Navy, Bureau Of Medicine And Surgery

• Department Of The Navy, Bureau Of Medicine And Surgery, Navmed P-5010- 4 Manual of Naval Preventive Medicine, Chapter 4, Swimming Pools and Bathing Places

• Military Handbooks, MIL-HBK-1037.1 (Draft) Training and Recreational Pools

• Department Of The Navy, Naval Education And Training Command NETC P1552/16 (2017) Navy Swimming and Water Survival Instructor Manual

ARCHITECTURAL DESIGN CRITERIA

• IBC 2018 – International Code Council, International Building Code 2018

• UFC 1-200-01 DoD Building Code, with Change 1, 10-01-2020

• UFC 3-101-01 Architecture with Change 1, 01-05-2021

• UFC 3-110-03 Roofing with Change 5, 06-12-2020

• UFC 3-190-06 Protective Coatings and Paints, 03-01-2021

• UFC 4-750-07 Recreational Aquatic Facilities, 04-20-2020

MECHANICAL DESIGN CRITERIA

• General Building Requirements: UFC 1-200-01, with change 1, 01 October 2020

• Energy Conservation: UFC 1-200-02, with change 02, 01 June 2022

• Mechanical Engineering: UFC 3-401-01, with change 1, 01 October 2015

• Design: Engineering Weather Data: UFC 3-400-02, 20 September 2018

• Heating, Ventilating, and Air Conditioning Systems: UFC 3-410-01, with change 8, 21 July

• Direct Digital Controls for HVAC and other Building Control Systems: UFC 3-410-02, with change 2, 12 April 2021

• Energy Standard for Buildings except for Low-Rise Residential Buildings: ASHRAE 90.1-

• Ventilation for Acceptable Indoor Air Quality: ASHRAE Standard 62.1-2016

• DoD Minimum Antiterrorism Standards for Buildings: UFC 4-010-01, with change 1, 19 August 2020

• Plumbing Systems: UFC 3-420-01, 01 April 2021

ELECTRICAL DESIGN CRITERIA

• Electrical Engineering, UFC 3-501-01, With Change 1, 01 November 2019

• Interior Electrical Systems, UFC 3-520-01, With Change 2, 12 April 2021

• Interior and Exterior Lighting Systems and Controls, UFC 3-530-01, With Change 4, 01 November 2019

• Telecommunications Interior Infrastructure Planning and Design, UFC 3-580-01 01 Jun 2016, With Change 1, 01 June 2016

• Fire Stations, UFC 4-730-10, With Change 1, 11 June 2021

• Americans with Disabilities Act Accessibility Guidelines.

• ANSI C2, National Electrical Safety Code.

• ANSI C37.47, Distribution Fuse Disconnecting switches, Fuse Supports and Current Limiting.

• ANSI C84.1, Electric Power Systems and Equipment Voltage Ratings.

• NFPA 70, National Electrical Code (NEC).

2 DESIGN REQUIREMENTS AND PROVISIONS

STRUCTURAL

ROOF FRAMING

The precast double tee roof structure over the RS Pool room (approximately 196 feet by 111 feet) is to be replaced by a steel framed system. The custom designed steel trusses will replace each of the existing concrete beams, typically at 6 feet spacing. Each truss will bear on the precast concrete corbel currently supporting the concrete tees. The top chord of the truss will pitch from center to form a 1/2 inch per ft slope towards north and south sides. Bottom of the trusses will be a few inches higher than the bottom of existing concrete beam.

A steel box girder will be designed to span 80 feet over the Wave Generator room at the south.

Steel trusses in this range will bear on the girder which will bear on new precast walls sitting on specially designed foundations. This is the measure to separate the RS Pool building structure from the vibration of waves and mechanical equipment.

All structural steel elements will receive a protective coating against rusting in this corrosive environment.

Roof slab will be a thin concrete slab over metal deck spanning from truss to truss. The concrete deck will counterweight against the wind uplift as the precast load bearing walls are not designed for uplift forces.

This work is per SOW 1.1.5, 1.1.6 and 1.1.8.

WAVE CHAMBER ISOLATION

New precast walls and foundations supporting the roof framing system will be isolated from the Wave Chamber with mechanical shed on top of it.

In the wave mechanical shed, existing equipment will be removed and re-installed after the shed is rebuilt. The shed will be demolished down to its floor slab, except the steel tube columns which will remain to support the new roof framing. The precast wall separating the RS Pool room and the shed will be replaced with a new precast insulated concrete wall sitting on the same beam as the existing wall but terminates under the box truss girder. This wall will support the shed’s steel roof beams to form a portal frame to resist both gravity and lateral loads of the shed.

The wave chamber (sub-structure) and the mechanical shed (superstructure) are thus isolated from the RS Pool building structure at all sides, from foundation to roof.

This work is related to SOW 1.1.8 and 1.1.9.

RS POOL ROOM SOUTH WALL REPLACEMENT

The insulated precast concrete walls at each side of the Wave Chamber have widespread cracking and internal rusting and will be replaced in kind. The replacement is limited to the RS Pool room. The new walls will function as the south side shear wall as originally intended; and support the new roof trusses and the box girder truss. The new walls will sit on the existing foundation but will be isolated from the vibration from the Wave Chamber and machinery.

This work is related to SOW 1.1.5 through 1.1.9

POOL DECK REPLACEMENT

The existing pool deck has ponding issue due to the low slope to drain design. East pool deck has soft pockets due to subgrade settlement. The South pool deck has crack lines likely the result of vibration from the Wave Chamber underneath.

The new work will include demolition of pool deck around the RS Pool, and constructing a new pool deck with higher slope and better drain layout (refer to the architectural narrative on this topic). The new deck will be slab-on-grade. It will be properly detailed for positive drainage and to avoid random cracking.

This work is per SOW 1.1.10.

NEW CRANE IN MECHANICAL ROOM

A new crane similar to the one over the UMET Pool room has been requested for the UMET Filter room to assist in moving the motors out of the pit. The crane will be attached to the existing precast concrete beams. The crane’s travel range shall cover large motors in the pit, and the floor where the motor is to be wheeled out. Existing lighting in this room is expected to be removed and reinstalled to above the bottom of concrete beams to allow clearance for the crane.

This work was requested by the pool maintenance staff during the meeting on-site, it is not listed in the SOW document.

PIPE BRACING

The large pipes in the UMET Filter room will be braced to the wall to reduce vibration when the motors are starting. This is in coordination with the pool equipment discussion in section 2.2.3.

This work is per SOW 1.1.13.

CATWALK AND PARTITION

Per SOW 1.1.20, the diving curtain is to be new and supported from the steel trusses. The pool maintenance staff suggested to provide a catwalk along the curtain to facilitate corrosion control and routine maintenance of the curtain. The catwalk is not included in the SOW.

STRUCTURAL CONDITIONS BEYOND RS POOL ROOM

Per SOW 1.13, visual observation was performed on the DT roof beams, precast walls, concrete floor slabs, and the wave generation structure. Photo references (Fig. xx) are referencing photos found in Appendix A.

Double Tee Roof Beams

The roof beams outside of the RS Pool are in good condition (See Figure 6). There are no signs of cracks or spalls. The spans of the double tee roof beams outside of the RS pool are much shorter ranging from 50 to 60 feet which is the typical fabrication range in the precast industry. Beams outside of the RS pool are also not subject to the wave chamber vibrations. Several beams and bearing pads in the UMET pool were inspected using a scissor lift and no deficiencies were found.

It should be noted that the bearing pads used for the beams are the same size as the bearing pads used for the large USTP beams.

Precast Walls

Interior walls are covered by a protective coating and there are no signs of rust or cracking beneath the coating.

Photos along the entire perimeter of the exterior of the building can be found in Appendix A Figures 8 through 41. The entire wall along the South face of the RS between grid 2 and 6 shows extensive damage.

Damage observed in this area includes:

• Discoloration of the wall showing evidence of water intrusion.

• Effloresce showing additional evidence of water intrusion.

• Vertical cracks widespread across the entire face of the wall.

• Horizontal cracks near the top of the wall.

• Rust marks showing of rusting reinforcement.

The damage in this area is due to the wave generation chamber causing constant vibrations of the wall. The signs of water intrusion and rust have shown that the reinforcement within the wall has started rusting. The structural integrity of these walls can no longer be guaranteed, and they must be replaced.

Walls outside of this area are in better condition. Typical walls do have some cracking but not nearly as widespread. There are also minor rust spots that are much more spread out than the rest of the building. The rust spots are likely due to a construction defect with the form ties and will not cause additional damage. The typical building walls can remain in place.

Concrete Floor Slab

Floor slab is in good condition. There are large cracks in the floor slab inside the RS Pool near the edges of the floor slab. These cracks were noted in the previous report. The floor slab will be rebuilt in this area with isolation joints installed along the edge to separate the slab behind the wave chamber from the rest of the slab. The user did note that there are drainage issues with the floor due to the low slope and although there are no structural issues the floor will need to be rebuilt with trench drains in some areas.

Wave Generation Structure

The wave generation equipment structure and shelter are in good condition. There are minor cracks in the concrete floor slab extending from the column corners. The steel frame structure has some areas with surface rust.

The steel structure can be re-built after the walls are replaced using the original steel framing to save on cost. The steel framing will only need minor rust removal and paint touch up.

Platform Tower

Platform towers are in good condition, see Figure 7. Towers are steel structures bolted to the concrete floor. There are some areas of the steel structure with light surface rust, but there are no signs of section loss or loss of strength. The steel will need to be cleaned with galvanizing re-applied in these areas to extend the life of the structures.

Precast Wall Water Leaking

The drawings that were provided are at the shop drawing level that appear to accurately capture the sizing of the structural elements. Double-T beams in the UMET pool were observed with a scissor lift and were found to match the drawings. Beams in other areas of the faculty are covered by the ceiling and could not be observed.

Several years ago, the facility maintenance team drilled a hole in the interior wall between the wet storage room and UMET pool to install a CAT 5 cable. After the hole was drilled water slowly flowed out of the hole for several days, see Figure 1. The precast wall panels are sandwich panels with insulation between the concrete faces. The team investigated the roofing and flashing at the parapet above the wall and found no signs of water intrusion. The wall appears to be in good condition with no signs of damage. The most likely source of the water is that it was trapped in the void during construction. The coast guard maintenance team will drill a hole in the same wall panel at a lower point to see if water is trapped at any other locations within the wall. If no other water is found it can be concluded that this was a one-time problem and will not cause further issues.

RESCUE SWIMMERS TRAINING POOL

PIPING SYSTEM P5 AND P8

This section is pertaining to SOW 1.1.11, the damaged piping system P5 and possibly P8.

Extensive discussions took place with CG staff to determine the history of water leakage and potential causes of the leakage. It was stated that during construction the RS pool floated out of the ground because of surrounding groundwater forces. The pool plumbing and structure were repaired, and a structural pile system was constructed to anchor the pool in place to resist the groundwater forces.

After pool water leaking was discovered, a project was developed in 2020 to investigate the source of the leaking and pool water loss. A report from that project was developed by GMHILL in March 2021 entitled “FINAL REPAIR EXECUTIVE SUMMARY REPAIR POOL LEAK AT BLDG. 3

U.S. COAST GUARD BASE ELIZABETH CITY ELIZABETH CITY, NORTH CAROLINA CONTRACT

NUMBER: 70Z08319CPCR02800”. The conclusion of that report stated that the leakage problem is solely the result of damages to a piping system labeled P5. The report summarized the leaking problem as follows:

“While the requirement of maintaining the operation of the dive pool presented multiple challenges to the engineering team, the clear cause of the pool leak was determined to be the P5 drain line.

Further, the integrity of the P8 drain line was proven through the isolation of P5 through temporary drain plugs and the immediate cessation of water loss.” (Page 7 “Summary” section of the referenced report.)

During our site visit, the report was discussed with CG staff. Although the report identified piping system P5 as the source of pool leakage, because of debris noted in system P8 during the camera inspection associated with the referenced study, CG staff suspect there may also be leaking or potential leaking issues with P8 as well.

Our pool design engineers also discussed with CG staff another possible source of water leaking that was not investigated as part of the referenced study. That potential leaking source is the piping network under the pool that supplies water from the filtration system to the pool through a network of pool floor inlets. Since the pool floor was damaged and repaired during original construction due to the floating of the pool upward, it is possible that this piping network could also be damaged and a source of current or future water leaking.

Our pool engineers suggested consideration of abandoning in place and sealing off all the piping systems currently under the pool floor, namely systems P5, P8, and all floor inlets. All these piping systems would then be replaced with new parameter piping systems that are routed around the pool under pool decking and not the pool floor.

Replacement of all the floor piping systems as stated above does require waiving some pool design guidelines as follows:

1. TB MED 575, 2-36 c. - “Place bottom inlets around the entire perimeter of the pool at intervals no greater than 20 feet; space rows of inlets no more than 15 feet from the side walls.”

2. UFC 4-750-07 20 April 2020, 3-3.9.7 - “Provide at least one main drain in the deepest part of the swimming pool.”

3. 2018 MAHC CODE, 4.7.1.3.1.3.1 – “For pools greater than 50 feet wide, floor inlets shall be required.”

Since the pool leaking problem is severe and continued leaking could pose ongoing issues related to pool structural movement, CG has directed our engineers to proceed with replacement of the piping systems as described and waiving the guidelines listed. The main drains in the pool floor will remain in place to make future pool draining through temporary sump pumping easier. All piping into the main drains will be abandoned and sealed off.

In addition to replacement of all pool floor piping systems, supply piping for the water spray training features will be rerouted to the surge/balance tank as appropriate.

SURGE TANK LEAK

This item is per SOW 1.1.12.

Discussions with CG staff revealed that the surge/balance tank leaking was observed by groundwater entering the structure through a single defect in one of the walls when the structure was emptied. The solution for this is to empty the structure during construction and inject an epoxy grout into the defect to stop any groundwater intrusion. The contractor should thoroughly inspect the structure for any further leaks and make the same repair in any places appropriate. Stopping groundwater from leaking into the tank will also seal up any potential location that pool water can leak out of the structure.

EXCESSIVE VIBRATION OF PIPING

This item is per SOW 1.1.13, regarding recirculation pump discharging piping having excessive vibration and ongoing damage.

It was discovered during conversations with CG staff that excessive vibration in the discharge piping from the RS pool recirculation pumps has caused this piping to break on more than one occasion. It is suspected that much of this vibration is caused by the fact that there are no soft start capabilities of the pump motors to ramp up water flow instead of a sudden “on” and “hammering” condition. To resolve this, the design will add programmable VFD drives for both motors and the motor of the recirculation pump for the UMET pool. Flow meter will be added to control the VFD drives based on required turnover flow rates for each pool. The piping will also be further braced as part of the structural hoist system for the pump motors.

Another design solution will be modifying the float valves in the surge/balance tank to a higher elevation to allow the pumps to draw from more water depth in the tank. This will help mitigate issues of the pumps often losing prime, which contributes to the vibration problems at the discharge piping.

POOL WATER CHEMISTRY BALANCE

This item is per SOW 1.1.15, regarding pool water chemistry balancing difficulties with both RS and UMET pools (low alkalinity and calcium hardness in the makeup water) and UV equipment age issues including lack of repair part availability.

It was discovered during conversations with CG staff that the current UV equipment is obsolete and repair parts are difficult or impossible to find. It was also discovered that pool operations staff have difficulty maintaining proper pool water chemistry because of low alkalinity and calcium hardness in the makeup water entering the pool.

To resolve the UV problem, the UV system for all 3 pools will be replaced with modern equipment.

To help mitigate the pool water chemistry issue, our design includes the addition of a CO2 gas system to lower pH in the pool water instead of the current muriatic acid system. This will inherently add more alkalinity to the water while lowering pH. The existing muriatic acid system will remain in place as a back-up to the new CO2 system.

OPERATIONAL ISSUES

This item is per SOW 1.1.21, regarding operational issues with automated water fill devices.

It was discovered during conversations with CG staff that there is an issue of the automated water fill system not functioning properly because of materials from training rafts fouling the water probes. The design solution is replacement of the existing automated water sensor probes and installation of screening material in the piping to help catch debris that is fouling the probes.

POOL FLOOR COATINGS

This item is listed as part of SOW 1.1.10, regarding replacement of RS and UMET pool slab coatings.

Since wholesale replacement of the pool shell plaster and tile is labor intensive/expensive, and we do not see any apparent damage to the existing materials, our design will include as a base bid construction item thorough power wash cleaning of the entire pool surface. We will also ask for a per square foot price from the contractor to replace any damaged plaster discovered after the cleaning.

We will also include an add alternate bid price item for total replacement of the plaster and tile coating system by chipping and removing the entire surface with replacement following plaster and tile manufacturer guidelines.

ARCHITECTURAL

The Rescue Swimmers Training Facility (RSTF) on the USCG Support Center, Elizabeth City N.C.

is a one story, 50,992 sq. ft., precast concrete structure with a 2,704 sq. ft. mezzanine totaling 53,696 sq. ft. in all. The construction type of the building is Type 1B non-sprinklered with separated mixed uses of Assembly (A-3) for the pool areas and Business (B) for the rest of the associated spaces. The RS and UMET pool areas of the RSTF are Assembly (A-3) along with associated training facilities, circulation, and utility spaces designated as Business (B). The two occupancy uses are separated by two (2) hour fire resistance rated construction for the structure, walls, and floor assemblies. The roof is constructed with a class B one (1) hour fire resistance rated assembly.

RS and UMET Pool Areas

The exterior walls are constructed of twelve inch insulated precast concrete wall panels. The roof is constructed of precast concrete double tees with lightweight insulated concrete and a SBS modified bitumen roofing system. The floor construction is a reinforced concrete slab on grade with a rubberized epoxy coating.

Wave Generation Room

The wave generation room exterior walls are constructed of cmu with brick veneer on the east and west walls and vertical structural steel tubes with aluminum infill fencing and gate on the south wall. The roof is constructed with lightweight insulated concrete and a SBS modified bitumen roofing system on horizontal structural steel tubes. The floor construction is a reinforced elevated structural concrete slab.

VERIFICATION OF BUILDING #3

This is pertaining to SOW 1.1.3.

On April 26, 2022, members of WSP’s architectural department conducted a site investigation of the RSTF Building #3 on USCG Base, Elizabeth City. The purpose of the site investigation was to document existing conditions and verify the as-built drawings of the RSTF to the greatest extent possible. The investigation also included a more detailed inspection of the precast wall separating the UMET pool from the diver’s storage locker because water was previously observed draining out of the wall when conduit was installed in the wall for CAT 5 cable.

During the site investigation WSP documented and verified the following:

• The existing conditions generally matched the as-built drawings received from the USCG dated June 22, 2012, for the RSTF.

• The precast wall that was previously observed to be draining water was determined to be an isolated occurrence during installation of the precast wall. This determination was made as a result of WSP observing the roofing above the wall on both sides of the parapet and the coping that caps the wall to be in good condition.

NEW ROOFING SYSTEM OVER RS POOL ROOM

This is per SOW 1.1.6.

The roofing system will be replaced over the RS pool after the new roof support system comprised of a long span steel joist system with metal deck and concrete roof deck has been installed. A SBS modified bitumen roofing system and all associated components will be installed to match the existing roofing system.

RECONSTRUCT AFTER WAVE GENERATOR ISOLATION

This is per SOW 1.1.8.

During the site investigation of the RSTF it was determined that the wave generation room has damaged the structural integrity of the precast wall panels on the south wall of the RS pool and needs to be isolated from the rest of the building due to the extreme forces it generates and the fact that it is attached directly to the precast panels. The precast panels were observed to be cracking and the reinforcing embedded in the concrete was observed to be rusting through the panels.

Due to the existing damage to the existing precast wall panels on the south wall of the RS pool, they will be replaced between column lines 2 and 6 of the RSTF. The six (6) windows in the previously mentioned existing precast wall panels on the south wall of the RS pool will be removed from the panels in accordance with RSTF staff direction. The two (2) double doors on the south wall of the RS pool on either side of the Wave Generation Structure will be removed and replaced with new FRP doors and frames.

To isolate the wave generation room from the rest of the building, WSP’s structural engineers will design a box truss to span the entire length of the wave generation structure and isolate the extreme forces it generates. The box truss will be clad in insulated metal panels to maintain the thermal performance and all other associated requirements of the building.

In discussions with RSTF personnel during the site investigation it was mentioned that dirt and grass were being discharged into the RS Pool from the Wave Generation System when maintenance personnel cut the lawn outside of the Wave Generation Structure. WSP’s solution to prevent grass and dirt from entering the Wave Generation Structure will be to provide black canvas fabric on the inside of the existing mesh fencing from the finished floor up to six feet on the Wave Generation Structure fencing. This will prevent the debris from entering the structure but maintain adequate air flow to the Wave Generator System blowers.

POOL DECK RENOVATION

This is per SOW 1.1.10.

In discussions with RSTF personnel during the site investigation it was determined that the pool deck of the RS pool does not drain properly, which creates ponding on the deck. However, the pool deck of the RS pool area will be demolished during the repair of the RS pool infrastructure.

This will allow WSP to redesign the drainage solution for the RS pool deck. WSP will lower the drains to create adequate sloping of the pool deck to ensure proper drainage and resolve the current ponding issues on the pool deck. Once the new RS pool deck is completed a rubberized epoxy coating will be applied to provide a finished floor.

Additional floor coatings in areas of the RSTF were determined during the site investigation to need replacement. These areas included the RS pool associated corridors including the ramp to the admin/office area, the debrief and warming room, diver’s wet storage, and the UMET pool deck. These areas will have the existing floor coating milled down and replaced with a rubberized epoxy coating to match the RS pool deck floor coating.

IMPROVE POOL DECK DRAINAGE

This is per SOW 1.1.19.

Reference SOW 1.1.10 above for proposed repair and modification of the RS pool drainage system.

NEW RS POOL DIVIDER

This is per SOW 1.1.20.

During the site investigation of the RSTF it was determined that the existing RS pool ceiling mounted roll up curtain divider is no longer functional and is stuck in the rolled-up position due to the corrosive environment of the RS pool facility. It was determined during the site investigation that facility personnel are unable to perform any routine maintenance of the curtain, especially lubricating the rollers of the curtain divider because they do not have a way to access the rollers from the pool deck.

A new ceiling mounted roll up curtain divider will be installed over the RS Pool if a suitable product designed for the extreme corrosive environment can be located and approved by USCG COR. In addition to the curtain divider a catwalk system will be provided that runs the length of the curtain divider to ensure that the facility personnel will be able to perform routine maintenance on the rollers and maintain a functional curtain divider.

NEW RS POOL STAINLESS STEEL OVERHEAD DOOR

Not in original SOW.

During the site investigation and meeting with USCG RSTF staff it was determined that the existing steel overhead door at the northeast corner of the RS Pool is severely damaged due to the corrosive nature of the RS Pool environment. This door and all associated components will be replaced with a stainless-steel overhead door and all associated components to match the existing stainless steel overhead door located in the UMET Pool (OHD 31/C).

UMET FILTER ROOM

Not in original SOW.

During the site investigation meeting with USCG RSTF staff it was determined that removing and hoisting the pumps out of the pit in the UMET Filter Room was an arduous process and an easier process was desired. A portable davit crane will be provided in the UMET Filter Room to assist with moving and hoisting the pumps located in the pit onto the platform above.

Also mentioned during the discussion at the site investigation meeting was the need to shore up or brace certain existing piping for the pool systems in the UMET Filter Room. WSP will provided pipe bracing details to the pipes indicated in the meeting to reduce the movement and associated noise of the pipes.

MECHANICAL

Air Handling units and associated air-cooled condensing units serving the RS Pool room will be replaced, and the condensing unit associated with the UMET pool room air handling unit will also be replaced. The exhaust fan and gravity ventilators located on the roof above the RS Pool room will be removed to permit the demolition and construction of the new roof. New exhaust fan and gravity ventilators will be provided on the new roof. The existing HVAC controls system will be replaced to be compatible with the base-wide Siemens Building Automation system.

Plumbing systems will be modified as required to permit installation of a new roof and new wall in accordance with the scope of work for the RS Pool room.

DESIGN DISCRIPTION

In accordance with SOW item 1.1.14, air handlers serving the RS Pool room (PRTU-1 and PAHU-2) and the condensing unit associated with the UMET pool room air handler (PAHU-2) will be replaced. Equipment will be replaced to meet the temperature and humidity requirements of the new space layout. Removal of PAHU-2 will require removal of an exhaust fan and louver serving the mechanical room. The condensing unit associated with PAHU-3 that conditions the UMET pool room will be replaced with a similar capacity unit, but capable of operating at high ambient conditions. Air handlers will be provided with variable speed fans. The fans will be equipped with EC motors; however, it should be noted that exceptionally long lead times (post- COVID) for this equipment may conflict with the desired project schedule. New air handlers will be provided with minimum efficiency MERV 13 filters.

Ductwork located within the RS Pool room will be removed and replaced. New ductwork will be suitable for the wet and corrosive environment. Fabric ductwork with a skeleton support system will be utilized for supply ductwork in the RS Pool room.

Roof mounted exhaust fan (EF-3) and roof mounted ventilators (GRV-1 and GRV-2) will be removed and replaced.

It is understood that a demand control ventilation scheme is desired for new equipment. This will be evaluated if practical for a natatorium. There is concern with implementing this control scheme while maintaining proper temperature and humidity control.

All utilities such as domestic water piping and fog machine piping that are located under the slab between the south wall and pool shall be removed complete to allow installation of new pool. Removed utilities shall be provided new under new work phase.

Rain leaders will be removed from the existing roof to beneath the slab as required for installation of the new roof and wall. Utilities such as domestic water piping, compressed air piping, hose bibs, etc. will be removed completely as required for installation of the new south wall. Sanitary piping and floor drains within the RS Pool room and wave generating equipment room will be removed as required for installation of the new slab and wall. All piping that is removed, will be replaced with new piping. Any specialty items that are removed will be salvaged, cleaned, and reinstalled.

An electric unit heater will be provided to provide spot heating towards the instruction area.

The building Schneider control system will be replaced with a Siemens Building Control Automation System. This work will require replacement of the existing BACnet bus from the main building supervisory controller to each of the control cabinets. Controllers within the cabinets will be replaced to be integrated into the Siemens front-end. The BACnet bus from the control cabinets to the field controllers will remain existing. The controllers to each of the VAV terminal units will be replaced as well as all space temperature sensors and hot water control valve actuators for all of the HVAC equipment. All existing equipment, control points, sequence of operations, etc. shall be integrated into new Siemens system. A new water level switch shall be provided in the pump room to send an alarm signal to the BAS if a high level of water is detected in the pump room.

OUTSTANDING ITEMS

1) During the kick-off meeting, integrating certain control points associated with the pool solar water heating system with the Building Automation System was mentioned. This work is not indicated in the scope of work. It is PACE’s understanding that this work is to be included in the scope of work. A discussion is needed to understand which control points are desired to be reported back to the BAS. During one of PACE’s site visits, there is an existing BTU meter that appears to be tied into the solar loop, but it is believed that this meter does not tie into the BAS. Depending on the desired monitoring points, the meter could be replaced and tied into the BAS system.

2) PACE's understanding of the existing RS Pool Room HVAC units is that, while the base has experienced several maintenance issues with the equipment in the past, when the units are in operation, they are actually able to maintain proper space temperature and humidity. Very recently, it was brought to PACE’s attention by the HVAC equipment vendor that the RS Pool Room HVAC units may be significantly undersized. PACE understood this was a concern with the UMET Pool Room outdoor unit, but not the RS Pool Room units. Further discussion with the USCG is desired to fully understand the operation of the RS Pool and associated equipment to ensure the HVAC system serving the space is adequately sized to meet the space conditions. Information needed to properly size the system includes time duration of exercises, time duration of the wave machine operation, space humidity and temperature setpoints and tolerances, and the ability of the two systems to maintain these setpoints, etc. Obtaining this information is critical to sizing the HVAC system properly.

ELECTRICAL

All existing electrical, telecommunications, and fire alarm equipment and infrastructure within the RS Pool area will be demolished as required and replaced in kind to facilitate replacement of the roof and exterior wall. Existing electrical equipment and infrastructure associated with the RS Pool equipment and HVAC equipment to be replaced will be demolished and replaced.

DESIGN DESCRIPTION

To facilitate the replacement of HVAC units serving the RS Pool, the associated electrical equipment and circuits will be disconnected, removed, and salvaged for reuse. If the electrical characteristics of the new HVAC units differ from the existing to require different overcurrent protection, then the existing electrical equipment and circuits will be replaced complete to coordinate with new circuit requirements.

Existing electrical equipment and circuits associated with pool equipment to be replaced or modified will be disconnected, removed, and salvaged for reuse. If the electrical characteristics of the new pool equipment differ from the existing to require different overcurrent protection, then the existing electrical equipment and circuits will be replaced complete to coordinate with new circuit requirements. Additional circuits and equipment will be provided as required to coordinate with pool equipment. This includes monitoring of water levels within the pit with a high-water alarm and a motorized lift.

All utilities such as conduit, outlets, electrical devices, etc. that pass through or are supported by the south wall that separates the wave generation equipment room from the RS Pool room will be removed and replaced as required to support removal and construction of the new wall.

All light fixtures in the RS Pool room will be removed. The existing LED pendant mounted light fixtures suspended from the ceiling will be salvaged and turned over to the government. The associated lighting circuits will be demolished as required to facilitate the removal and construction of the new roof and wall. The remainder of the lighting circuit will be reused to the maximum extent possible. New LED lighting will be provided in the RS Pool room. Wall mounted exterior light fixtures mounted on the RS Pool room exterior wall will be replaced in kind with LED lights. The remainder of the lighting circuit will be reused to the maximum extent possible.

Any existing portions of the building lightning protection system impacted by the roof repairs within the RS Pool room and HVAC replacements will be replaced in kind to maintain compliance.

FIRE PROTECTION

PROJECT DESCRIPTION

The building is not equipped with a fire sprinkler system. A life safety code analysis will be performed to determine if a sprinkler system should be added to the building based on changing the RS Pool room roof structure from concrete to steel.

3 DESIGN DELIVERABLE

LIST OF SPECIFICATIONS

01 11 00 Scope of Work

01 11 16 Work by Others

01 12 16 Project Phasing

01 14 00 Contractor Work Hours

01 14 13 Pre-bid Site Visits

01 14 14 Pre-Construction Site Conditions

01 14 16 Coordination

01 14 19 Field Adjustments

01 18 13 Utility Permits

01 18 14 Building Permits

01 18 17 Environmental Permits

01 26 13 Request for Information

01 31 19 Project Meetings

01 32 16 Construction Schedule, Schedule of Values and Progress Schedule

01 32 26 Construction Daily Reports

01 33 00 Submittal Procedures

01 35 29 Safety Program

01 51 00 Temporary Utilities

01 51 13 Equipment/Utility Lockout and Tagout Requirements

01 51 16 Temporary Fire Protection

01 54 30 Confined Entry

01 55 00 Access Roads and Parking

01 55 29 Staging Areas and Access

01 56 00 Lights, Signs & Barricades

01 57 13 Erosion and Sediment Control

01 57 23 Pollution Control

01 58 00 Marine Lights and Signals

01 65 00 Recovered Materials Notice

01 66 13 Hazardous Waste

01 66 16 Safety Data Sheets and Material Handling Procedures

01 71 33 Protection from Weather and Construction Operations

01 74 00 General Cleanup and Site Restoration of Work Areas

03 30 00 Cast-In-Place Concrete

03 45 33 Precast Prestressed Structural Concrete

05 12 00 Structural Steel

05 21 00 Steel Joist Framing

05 30 00 Steel Decks

05 40 00 Cold-Formed Metal Framing

06 10 00 Rough Carpentry

07 22 00 Roof and Deck Insulation

07 27 19.01 Self-Adhering Air Barriers

07 42 13 Metal Wall Panels

07 52 00 Modified Bituminous Membrane Roofing

07 60 00 Flashing and Sheet Metal

07 84 00 Firestopping

07 92 00 Joint Sealants

08 22 20 Fiberglass Reinforced Plastic (FRP) Doors and Frames

08 31 00 Access Doors and Panels

08 33 23 Overhead Coiling Doors

08 71 00 Door Hardware

09 06 00 Schedules for Finishes

09 84 20 Acoustical Wall Panels

09 90 00 Paints and Coatings

09 96 00 High-Performance Coatings

09 96 56 Epoxy Floor Coatings

10 22 26.23 Coiling Partitions – Curtain Divider

13 15 00 Swimming Pools

22 00 00 Plumbing, General Purpose

23 05 15 Common Piping for HVAC

23 05 93 Testing, Adjusting, And Balancing for HVAC

23 07 00 Thermal Insulation for Mechanical Systems

23 09 23.01 LonWorks Direct Digital Control for HVAC

And Other Building Control Systems

23 09 23.02 BacNet Direct Digital Control for HVAC

And Other Building Control Systems

23 30 00 HVAC Air Distribution

23 81 00 Decentralized Unitary HVAC Equipment

26 20 00 Interior Distribution System

26 51 00 Interior Lighting

26 56 00 Exterior Lighting

27 10 00 Building Telecommunications Cabling System

28 31 70 Interior Fire Alarm System, Addressable

32 31 13 Chain Link Fencing (Canvas Fabric Mesh)

DRAFT LIST OF DRAWINGS

STRUCTURAL DRAWING LIST

1. S-001 GENERAL NOTES

2. S-002 GENERAL NOTES AND ABRIVIATION

3. SD001 RST POOL ROOF DEMOLITION PLAN

4. SD201 DEMOLITION ELEVATION

5. SD202 DEMOLITION SECTIONS

6. SB101 RST POOL FOUNDATION PLAN

7. SB102 RST POOL DECK PLAN

8. SB301 SECTIONS AND DETAIL

9. SB302 SECTIONS AND DETAIL

10. SF101 RST POOL MEZZANINE FRAMING PLAN

11. SF102 RST POOL ROOF FRAMING PLAN

12. SF103 UMET FILTER CRANE FRAMING PLAN

13. S-201 STEEL TRUSS ELEVATIONS

14. S-202 PRECAST WALL ELEVATIONS

15. S-301 SECTIONS AND DETAIL (catwalk, wave mech room)

16. S-302 SECTIONS AND DETAIL (main roof steel)

17. S-303 SECTIONS AND DETAIL (main roof steel)

18. S-304 SECTIONS AND DETAIL (UMET crane and bracing)

POOL DRAWING LIST

1. PP001 REPAIR OF PLUMBING SYSTEM P5

2. PP002 REPAIR OF PLUMBING SYSTEM P8 (ALTERNATE)

3. PP003 LINE AND VALVE RECONFIGURATION INSIDE OF SURGE TANK

4. PP004 REPLACEMENT OF UV EQUIPMENT

5. PP005 ADDITION OF CO2 TANK FEEDING SYSTEM WITH CONTROLS

6. PP006 REPLACEMENT OF AUTOMATED FILL PROBES

7. PP007 ADDITION OF VFD DRIVES FOR RECIRCULATION SYSTEM MOTORS

8. PP008 REPLACEMENT OF POOL FLOOR FINISH

ARCHITECTURAL DRAWING LIST

1. G-001 COVER SHEET

2. A-001 ARCHITECTURAL NOTES, ABBREVIATIONS, AND LEGENDS

3. AD100 DEMO OVERALL FLOOR PLAN

4. AD101 DEMO FLOOR PLAN AREA A

5. AD102 DEMO FLOOR PLAN AREA B

6. AD103 DEMO FLOOR PLAN AREA C

7. AD104 DEMO FLOOR PLAN AREAS D, E, AND F

8. AD105 DEMO MEZZANINE FLOOR PLAN

9. AD110 OVERALL DEMO REFLECTED CEILING

10. AD111 DEMO REFLECTED CEILING PLAN AREA A

11. AD112 DEMO REFLECTED CEILING PLAN AREA B

12. AD120 DEMO ROOF PLAN

13. AD401 DEMO ENLARGED WAVE GEN. PLANS

14. A-100 OVERALL FLOOR PLAN

15. A-101 FLOOR PLAN AREA A

16. A-102 FLOOR PLAN AREA B

17. A-103 FLOOR PLAN AREA C

18. A-104 FLOOR PLAN AREAS D, E, AND F

19. A-105 MEZZANINE FLOOR PLAN

20. A-110 OVERALL REFLECTED CEILING PLAN

21. A-111 REFLECTED CEILING AREA A

22. A-112 REFLECTED CEILING AREA B

23. A-120 ROOF PLAN

24. A-121 ROOF PLAN AREA A

25. A-122 ROOF PLAN AREA B

26. A-201 BUILDING ELEVATIONS

27. A-202 PRECAST PANEL TYPES

28. A-203 PRECAST PANEL TYPES

29. A-301 WALL SECTIONS

30. A-302 WALL SECTIONS

31. A-401 ENLARGED WAVE GENERATION PLANS

32. A-501 ROOF DETAILS

33. A-502 ROOF DETAILS

34. A-503 ROOF DETAILS

35. A-504 MISC. DETAILS

36. A-505 MISC. DETAILS

37. A-601 SCHEDULES

MECHANICAL DRAWING LIST

1. M001 – GENERAL NOTES AND LEGEND

2. MD101 – OVERALL DEMOLITION FLOOR PLAN

3. MD102 – DEMOLITION PLAN – AREA D

4. MD103 – DEMOLITION PLAN – AREA E

5. MD104 – OVERALL DEMOLITION ROOF PLAN

6. MD401 – ENLARGED DEMOLITION PLANS

7. MH101 – OVERALL NEW WORK PLAN

8. MH102 – NEW WORK PLAN – AREA D

9. MH103 – NEW WORK PLAN – AREA E

10. MH104 - OVERALL NEW WORK ROOF PLAN

11. M401 – ENLARGED NEW WORK PLANS

12. M501 – DETAILS

13. M502 – DETAILS

14. M601 – SCHEDULES

15. M701 – CONTROLS

16. M702 – CONTROLS

PLUMBING DRAWING LIST

1. P001 – GENERAL NOTES AND LEGEND

2. P002 – DETAILS

3. PD101 – OVERALL DEMOLITION FLOOR PLAN

4. PD102 – DEMOLITION PLAN – AREA D

5. PD103 – DEMOLITION PLAN – AREA E

6. PD104 – OVERALL DEMOLITION ROOF PLAN

7. PD401 – ENLARGED DEMOLITION PLANS

8. P101 – OVERALL NEW WORK PLAN

9. P102 – NEW WORK PLAN – AREA D

10. P103 – NEW WORK PLAN – AREA E

11. P104 - OVERALL NEW WORK ROOF PLAN

12. P401 – ENLARGED NEW WORK PLANS

13. P601 – RISERS

ELECTRICAL DRAWING LIST

1. E001 – GENERAL NOTES AND LEGEND

2. ED101 –…