Final_CD_Narrative.pdf

U.S. DEPARTMENT OF

HOMELAND SECURITY

National Capital Region

DHS Operations Center (DOC A) Phase 2

FINAL CONSTRUCTION DOCUMENTS NARRATIVE, VOLUME 1

JULY 31, 2015

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TABLE OF CONTENTS

EXECUTIVE SUMMARY 5

1 FIRE PROTECTION AND

LIFE SAFETY CODE ANALYSIS 7

APPLICABLE CODES 7

FIRE PROTECTION FEATURES 7

MEANS OF EGRESS 11

2 SITE, LANDSCAPE AND CIVIL 13

SITE CONTEXT 13

STAIR D (DELTA) EXIT TO GRADE 14

CIVIL 16

3 ARCHITECTURE AND INTERIOR

DESIGN 21

DESIGN CONCEPT 21

CONSTRUCTION BID ADD-ALTERNATES 27

FINISH LEGEND 28

LIGHTING FIXTURE SCHEDULE 28

4 SUSTAINABILITY 29

BACKGROUND 29

LEED 29

PBS KEY SUSTAINABLE PRODUCTS INITIATIVE 31

5 ACOUSTICS 33

INTRODUCTION 33

GLOSSARY OF TECHNICAL TERMS 33

ACOUSTICAL SEPARATION 34

INTERIOR FINISHES 39

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6 VERTICAL TRANSPORTATION 43

INTRODUCTION 43

TRAFFIC ANALYSIS 43

7 STRUCTURAL ENGINEERING 45

GENERAL PROJECT DESCRIPTION 45

STAIR D – SOILS, FOUNDATION, AND

BELOW-GRADE STRUCTURE 45

STAIR D – STRUCTURAL FRAMING AT GRADE 46

ELEVATORS A3 AND A4 EXTENSION TO LL1 –

EXISTING STRUCTURAL FRAMING ALTERATIONS 46

OTHER REQUIREMENTS 46

PRELIMINARY STRUCTURAL DESIGN CRITERIA 47

8 MECHANICAL SYSTEMS 51

DESIGN CRITERIA 51

CALCULATIONS 52

SUPPLEMENTAL COOLING 55

HYDRONIC SYSTEMS 55

SMOKE CONTROL SYSTEM 55

AUTOMATIC TEMPERATURE CONTROL SYSTEM 55

9 PLUMBING SYSTEMS 57

DESIGN CRITERIA 57

BASIC PLUMBING SYSTEMS 57

PLUMBING FIXTURES 58

SYSTEM COMPONENTS 60

10 FIRE SPRINKLER AND STANDPIPE

SYSTEMS 61

GENERAL 61

KEY DESIGN ISSUES 61

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11 ELECTRICAL SYSTEMS 65

DESIGN CRITERIA 65

SITE ELECTRICAL UTILITIES 65

INTERIOR 480/277 & 208/120 VOLT POWER

DISTRIBUTION 66

SEISMIC BRACING 68

GROUNDING 68

INTERIOR LIGHTING 69

SPECIAL SYSTEMS 73

MASS NOTIFICATION 74

12 INFORMATION TECHNOLOGY,

PHYSICAL SECURITY, AND

AUDIO/VISUAL SYSTEMS 75

INTRODUCTION 75

SPECIFICATIONS, STANDARDS, AND

DESIGN INPUT 75

INFORMATION TECHNOLOGY 75

PHYSICAL SECURITY 85

AUDIO VISUAL 86

13 WAYFINDING STRATEGY AND

SIGNAGE DESIGN 91

CAMPUS-WIDE WAYFINDING STRATEGY 91

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U.S. DEPARTMENT OF HOMELAND SECURITY

DHS OPERATIONS CENTER PHASE 2

EXECUTIVE SUMMARY

BACKGROUND

The United States Department of Homeland Security Headquarters (DHS) Operations Center (DOC) is located at the St. Elizabeths West Campus in Washington, DC. In July of 2009 GSA retained the team of Goody Clancy|HDR, LLC to provide programming and architecture/ engineering (A/E) services for the design of the DOC. The original consolidation effort included the collocation of operations centers, decision support areas, and collaborative/ support areas into a single facility at this location. The DOC was subsequently divided into two phases, DOC Block A and DOC Block B, with DOC Block A being entirely below-grade and DOC B having both below-grade and above-grade structures as described in the May 1, 2011 “US Department of Homeland Security (DHS) Consolidated National Operations Center 100% Construction Documents Narrative, Volume 4”. The original program included an underground tunnel connection from DOC Block A through DOC Block B to the Center Building via knock-out panels at column lines L.2 & L.9 and column lines 8 & 9.

Due to budgetary shortfalls, the below-grade portion of DOC Block B was not (and will not

be) constructed, as a primarily above-ground West Addition project has been planned to take its place in a future phase of construction. DOC Block A was built and is a primarily underground facility consisting of three below grade levels located adjacent to the Munro Building, also known as the United States Coast Guard Headquarters (USCG HQ), with a direct connection from the USCG Command Center in the DOC directly into the Munro Building at Lower Level 2 (LL2). However, DOC Block A tenant improvements and campus support infrastructure are incomplete -- only areas supporting the St. Elizabeths campus Phase I development have been completed within the DOC. These areas include the US Coast Guard National Command Center (NCC), Campus Security Operations Center (CSOC), IT Operations Center (ITOC), Enterprise Operations Center (EOC) and their respective support spaces (i.e. rack rooms). DOC Block A will need to accommodate additional high-priority operation centers within the unbuilt-out portions now that DOC Block B will not be built. In order to relocate the DHS Secretary (S1) to St. Elizabeths as planned, the National Operations Center (NOC) Watch and Intelligence Watch and Warnings (IWW), their respective operational support elements, and the balance of the OPS Component (not included in the Center Building) all need to be constructed in DOC Block A.

PROJECT DESCRIPTION

The DOC A Phase 2 project consists of several major elements:

� Tenant fitout for National Operations Center and Current Operations Division on Lower Level 3.

� Installation of raised floor in empty shell spaces on Lower Levels 2 and 3 (included as Add Alternates #3a and #3b).

� Fit-out of new toilet and shower rooms on Lower Level 3 (with corresponding fitout on Lower Level 2 included as Add Alternate #4.)

� Construction of a new egress stair (Stair D), serving Lower Levels 2 and 3, on the north side of the DOC and its associated exit to grade.

� Installation of a new elevator (A4) serving all levels in an existing hoist way at the southeast corner of the building near Stair B (with the installation of adjacent elevator A3 as a Add Alternate #2).

� Completion of the DOC’s Chemical/Biological/Radioactive (CBR) systems design, including modifications to communicating doors to the Coast Guard and Utility Tunnel and a three chamber decontamination suite (including showers) to serve those entering the DOC from the Center Building during a CBR event (all included as Add Alternate #1.)

� Connection from the DOC to Stair Charlie in the Center Building.

� Reconfiguration of the interior of the existing DOC A entry pavilion on the ground level of the Coast Guard building to accommodate increased building occupancy.

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U.S. DEPARTMENT OF HOMELAND SECURITY

DHS OPERATIONS CENTER PHASE 2

1 FIRE PROTECTION AND LIFE SAFETY

CODE ANALYSIS

The Department of Homeland Security (DHS) consolidated Operations Centers facility (DOC) is a primarily-underground building located at the St. Elizabeths West Campus in Washington, DC. The building consists of three stories below grade and one above grade level. In accordance with the Life Safety-Egress Reference Sheet dated February 28, 2014, the largest floor plates are the DOC Lower Level 3 and Lower Level 2, which are each 5,690 square meters (61,254 square feet). The total aggregate area of the building is 16,845 square meters (181,337 square feet).

It is important to note that this analysis is intended for the DHS Operations Center Phase 2:

Lower Level 2 (LL2) and Lower Level 3 (LL3) renovation project only.

APPLICABLE CODES

The applicable codes and/or regulations relative to fire protection and life safety concerns for the DHS Operations Center Phase 2: Lower Level 2 (LL2) and Lower Level 3 (LL3) renovation project are:

� GSA 2014 P100 Facilities Standards (P100)

� 2012 International Building Code (IBC)

� 2012 Life Safety Code (LSC): NFPA 101

� 2003 International Building Code (IBC) – Accessible Means of Egress

To the maximum extent practicable, GSA requires that buildings and facilities on Federal property be constructed in compliance with the national building codes produced by the International Code Council (ICC); 2012 International Building Code being the most current edition.

In addition to the above referenced codes, the following standards for the installation of fire protection and life safety systems may be referenced in the design efforts. Note that additional standards may apply as referenced by the PBS-P100, IBC, or LSC.

� NFPA 10, Standard for Portable Fire Extinguishers, 2010 edition.

� NFPA 13, Standard for the Installation of Sprinkler Systems, 2010 edition.

� NFPA 14, Standard for the Installation of Standpipe and Hose System, 2010 edition.

� NFPA 70, National Electrical Code, 2011 edition.

� NFPA 72, National Fire Alarm Code, 2010 edition.

� NFPA 80, Standard for Fire Doors and Other Opening Protectives, 2010 edition.

� NFPA 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems, 2009 edition.

� NFPA 110, Standard for Emergency and Standby Power Systems, 2010 edition.

This analysis should not be construed to be a comprehensive review of structural, mechanical, electrical, plumbing or elevator code provisions (other than those fire protection and life safety items noted herein).

FIRE PROTECTION FEATURES

CONSTRUCTION TYPE

The existing building is a Type IA, protected, non-combustible structure in accordance with the Life Safety-Egress Reference Sheet dated February 28, 2014 and the 100% construction Documents Narrative-III Code Analysis dated May 1, 2011. Primary structural elements of Type IA buildings will be 3-hour rated. Primary structural elements supporting a roof only will be 1-1/2-hour rated, and all floor construction will have a fire resistance rating of 2-hours.

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Primary structural members are considered to be bearing walls, columns, and the girders, beams, trusses and spandrels having direct connections to columns and bracing members designed to carry gravity loads. The members of floor or roof panels which have no connection to the columns and do not carry a gravity load are considered secondary members and are not part of the structural frame of a building.

Construction of the building should be maintained throughout the proposed Phase 2 renovation project.

Refer to Part C below for fire resistance rating requirements.

USE AND OCCUPANCY

Under the requirements for Type IA construction all uses within the building (B, A, S) are permitted to be unlimited area. Therefore, the building is classified as a non-separated, mixed use building, containing Business Group B (offices, command centers, and data centers), Assembly Group A-3 (conference rooms), and Storage Group S-1 (storage rooms). Other supporting uses will include mechanical, electrical, and telecommunication rooms.

Due to this non-separated, mixed use classification, occupancy separations are not required in the building.

FIRE RESISTANCE RATINGS

The proposed Phase 2 renovations on LL2 and LL3 will most likely not affect many fire resistance ratings in the building. As indicated above, fire rated occupancy separations are not required in the building. Interior building elements that require fire-resistance ratings are listed below:

BUILDING ELEMENT FIRE-RESISTANCE RATING

EXIT STAIR ENCLOSURES 2

OTHER SHAFTS 2

ELEVATOR MACHINE ROOMS 2

COMPONENT WALLS AND PARTITIONS (HR) FIRE DOOR ASSEMBLIES (MIN)

ELEVATOR HOIST WAYS,

ELEVATOR MACHINE ROOMS

1 60

2 90

VERTICAL SHAFTS

(INCLUDING EXIT

STAIRWAYS)

1 60

2 90

IT EQUIPMENT ROOMS

(PBS-P100 SECTION 711.2 /

NFPA 75, SECTION 5.1.3.2) 1 60

INTERIOR FINISH

All new finishes associated with the proposed Phase 2 renovations on LL2 and LL3 must comply with the following:

WALL & CEILING FINISHES

Interior wall and ceiling finish are to be classified in accordance with ASTM E84, Standard Method of Test of Surface Burning Characteristics of Building Materials. Classifications are provided in the following table (IBC Section 803.1).

CLASSIFICATION FLAME SPREAD SMOKE DEVELOPMENT

CLASS A 0-25 0-450

CLASS B 26-75 0-450

CLASS C 76-200 0-450

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In Business occupancies:

� In exit enclosures of building less than 3 stories in height, Class C interior finish for sprinklered buildings is permitted (IBC Section 803.9).

� In exit access corridors, Class C interior finish is permitted (IBC Section 803.9).

� Rooms or enclosed spaces are based upon spaces enclosed in partitions of the building or structure. Where a fire resistance rating is required for the structural elements, the enclosing partitions must extend from the floor to ceiling. If enclosing partitions do not comply, the rooms or spaces on both sides are considered as one. In rooms or enclosed spaces, Class C interior finish is permitted (IBC Section 803.9).

In Assembly Group A-3 occupancies:

� In exit enclosures of building less than 3 stories in height, Class C interior finish for sprinklered buildings is permitted (IBC Section 803.9).

� In exit access corridors, Class B interior finish is permitted (IBC Section 803.9).

� Rooms or enclosed spaces are based upon spaces enclosed in partitions of the building or structure. Where a fire resistance rating is required for the structural elements, the enclosing partitions must extend from the floor to ceiling. If enclosing partitions do not comply, the rooms or spaces on both sides are considered as one. In rooms or enclosed spaces, Class C interior finish is permitted (IBC Section 803.9).

In Storage Group S-1 occupancies:

� In exit enclosures, Class C interior finish for sprinklered buildings is permitted (IBC Section 803.9).

� In exit access corridors, Class C interior finish is permitted (IBC Section 803.9).

� Rooms or enclosed spaces are based upon spaces enclosed in partitions of the building or structure. Where a fire resistance rating is required for the structural elements, the enclosing partitions must extend from the floor to ceiling. If enclosing partitions do not comply, the rooms or spaces on both sides are considered as one. In rooms or enclosed spaces, Class C interior finish is permitted (IBC Section 803.9).

FLOOR FINISHES

Interior floor finish and floor covering materials are to be classified in accordance with NFPA

253. Classifications are provided in the following table (IBC Section 804.2).

CLASSIFICATION RADIANT FLUX

CLASS I 0.45 Watts/cm^2 or greater

CLASS II 0.22 Watts/cm^2 or greater

Interior floor finish and floor covering materials in exit enclosures and corridors cannot be less than Class II in Group B occupancies. In sprinklered buildings, materials complying with the DOCFF-1 “pill test” (CPSC 16 CFR, Part 1630) are permitted in any areas where Class II materials are required. (IBC Section 804.4.1) Where finished floors or floor covering materials are of a traditional type, such as wood, vinyl, linoleum, terrazzo and other resilient floor covering materials, need not comply with above floor finish requirements (IBC Section 804.1).

GSA SPECIFIC REQUIREMENTS

Adhesives and other materials used for the installation of carpets shall be limited to those having a flash point of 60 degrees C (140 degrees F) or higher.

All other materials composed of combustible substances, such as wood (e.g., plywood, 610 mm by 1219 mm (2 feet by 4 feet) wood boards, etc.) shall be treated with fire retardant chemicals by a pressure impregnation process or other methods that treats the materials throughout (as opposed to surface treatment).

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AUTOMATIC FIRE SPRINKLER SYSTEM

In accordance with the as-built Fire Protection Reference Sheet FX-000, dated February 28, 2014, the building is fully protected by an automatic sprinkler system that was designed per NFPA 13.

Nearly all areas are equipped with quick-response sprinklers. The existing sprinkler system should be maintained throughout the proposed Phase 2 renovation project. Refer to MEP Analysis on the existing building systems for an understanding of all required components related to the fire sprinkler system.

PORTABLE FIRE EXTINGUISHERS

Portable fire extinguishers must be provided and spaced in accordance with NFPA 10 in all assembly, business and storage occupancies within proposed Phase 2 renovation project.

However, fire extinguishers are not required in Group A and B occupancies protected throughout by quick response sprinklers. All existing fire extinguisher locations should be maintained.

FIRE ALARM SYSTEM

In accordance with the as-built Fire Alarm Reference Sheet, FA-000 and the 100% construction Documents Narrative-III Code Analysis, the building is equipped with a fire alarm and voice communication system that was designed per NFPA 72. The system is electrically monitored and supervised. The existing fire alarm and voice alarm system should be maintained throughout the proposed Phase 2 renovation project. Refer to MEP Analysis on the existing building systems for an understanding of all required components related to the fire alarm system.

SMOKE CONTROL SYSTEM

In accordance with the as-built Mechanical Standard plan, M-000 and the 100% construction Documents Narrative-III Code Analysis, the building is protected by a smoke control system as required for all underground buildings. Activation of the smoke control system is automatic upon actuation of an automatic sprinkler zone and includes manual controls. The smoke control system will be provided with standby power, which will operate within 60 seconds of normal power loss to the building.

The existing smoke control system should be maintained throughout the proposed Phase 2 renovation project. Refer to MEP Analysis on the existing building systems for an understanding of all required components related to the smoke control system.

STAIRWAY PRESSURIZATION

Per the as-built Mechanical plan M-632, smoke proof enclosures have been provided in the building. All stairways serving floor levels more than 9.144 meters (30 ft.) below the finished floor level of the discharge level must be pressurized. The stair pressurization systems are activated when smoke is detected in close proximity to any of the stair entry doors to each stair enclosure.

Manual controls for the stair pressurization systems are also be provided in the fire command center. The stair pressurization fans will be provided with a primary and a secondary power supply. In the event of primary power failure, the stair pressurization fans are connected to the standby power system.

The existing smoke proof enclosures should be maintained throughout the proposed Phase 2 renovation project. The proposed Stair D should comply with the requirements for smoke proof enclosures to match the existing stairways. Refer to MEP Analysis on the existing building systems for an understanding of all required components related to the smoke pressurization system.

FIRE COMMAND CENTER

Although not required by Code, in accordance with the 100% Construction Documents Narrative- III Code Analysis, the building contains a fire command center. The fire command center is enclosed in 2-hour fire rated construction and should be maintained throughout the proposed Phase 2 renovation project.

If current building plans are provided in the Fire Command Center, those plans should be updated to reflect the newly renovated areas. Refer to MEP Analysis on the existing building systems for an understanding of any equipment changes within the fire command center.

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EGRESS LIGHTING AND EXIT SIGNAGE

Emergency egress lighting will be provided throughout the common portions of the means of egress in accordance with LSC. These areas include corridors, exit access spaces within areas requiring two (2) or more means of egress, the lobby/entrance areas, exit stairs, and the exit discharge areas (including exterior locations until the public way).

As required by PBS-P100, exit signage will meet the performance requirements of LSC.

Each required exit will be identified with an exit sign, including exit access, and within areas requiring multiple exits. Directional exit signs will also be provided to direct occupants toward the closest exit so that no occupant is more than 30.48 meters (100 ft.) from an exit sign.

The egress lighting and exit signs will be provided with a secondary source of power in the event that the primary power source is disrupted. The secondary power source will consist of either internal batteries or a connection to an emergency power system. Refer to MEP Analysis on the existing building systems for an understanding of all required components related to the electrical systems serving egress lighting and exit signage.

MEANS OF EGRESS

The means of egress system will be designed in accordance with the general means of egress provisions outlined by the LSC. The project will have an exit capacity adequate to accommodate the calculated occupant load.

� The proposed Phase 2 renovation project will provide adequate exit capacity for the calculated occupant load.

� A minimum of two (2) exits are provided from each level. Three (3) exits will be provided where the occupant load exceeds 500.

� Travel distance will not exceed 250 feet.

� Common path of travel distance is less than 75 feet.

� Dead-end conditions do not occur.

LSC Table 7.3.3.1 requires a minimum egress width of 5.08 mm (0.2 in) per occupant for doors, ramps, and corridors and a minimum egress width of 7.62 mm (0.3 in) per occupant for stairs; both factors assume a fully sprinklered building.

Exits must be so located on each story such that the maximum length of exit access travel, measured from the most remote point within a story along the natural and unobstructed path of egress travel to an exterior exit door at the level of exit discharge, an entrance to a vertical exit enclosure, an exit passageway, a horizontal exit, an exterior exit stairway or an exterior exit ramp, may not exceed the distances allowed by the Code. Table 1016.1 limits travel distance for Assembly, and Storage occupancies to 76.2 m (250 ft.) and 91.44 m (300 ft.) for Business occupancies.

Exit access must be arranged such that there are no dead-ends in corridors more than

15.24 m (50 ft.) for Business and Storage occupancies and 6.096 m (20 ft.) for all other occupancies.

Further, common path of travel is limited to 22.86 m (75 ft.) for Assembly occupancies with an occupant load of 50 or more. The common path of travel for Assembly occupancies with an occupant load less than 50 is 6.096 m (20 ft.). In Business and Storage occupancies common path of travel is limited to 30.48 m (100 ft.). Common path of travel is the portion of exit access where occupants are required to traverse before two separate and distinct paths of egress travel to two exits are available. If common path of travel is exceeded from any space or story, an additional exit will be required.

In addition to the exits required based on common path of travel limitations, all spaces and each story must have access to the minimum number of approved independent exits based on the occupant load. A minimum of two exits are required from any story with an occupant load of 500 or less, three exits from any story with an occupant exceeding 500 but less than 1,000, and four exits from any story with an occupant load exceeding 1,000.

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Note that each floor level serving an underground level must be provided with at least two (2) exits. (405.7.1)

Where two or more exits or exit access doorways are required from any portion of the exit access, at least two of the exit doors or exit access doorways must be placed a distance apart equal to not less than one-third of the length of the maximum overall diagonal dimension of the building or area to be served measured in a straight line between exit doors or exit access doorways.

Exit doors serving a room or space, with an occupant load greater than 50, must swing in the direction of egress travel.

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2 SITE, LANDSCAPE AND CIVIL

SITE CONTEXT

DOC A is a three-level subterranean structure on the DHS St. Elizabeths Campus, situated between the Center Building and the Munro Building/US Coast Guard Headquarters.

Portions of the Munro Building overlap with the DOC facility at Ground Level, and the current entrance to the DOC is through a small entry lobby on the north side of the Munro Building’s ceremonial entrance plaza.

Because DOC A is a pre-existing subterranean structure, site impacts for the Phase 2 project are limited primarily to impacts associated with the construction of a new egress stair, Stair Delta, on the north side of the DOC. Additional excavation and sitework will be necessary towards the southeast corner of the site in order to extend an existing elevator hoistway and allow for the installation of machine room-less traction elevators in this location.

St. Elizabeths Campus Context Plan

Existing DOC A Site Plan

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STAIR D (DELTA) EXIT TO GRADE

DESIGN APPROACH

As more fully described in the Architecture and Interior Design chapter of this Narrative, a new exit stair is required to satisfy egress requirements of a fully occupied DOC. This new stair will be primarily underground and will exit to grade between the Munro Building and the DOC air intake well, just beyond the transition slope to the ballfield on the north side of the DOC.

Several goals were established by the design team in developing the way Stair D exits to grade.

These included:

� Respecting the scale of the surrounding context, including the large size of the Munro Building, Center Building, and ballfield.

� Respecting the historic aspects of the campus.

� Minimizing any visual aspect of “entry,” since Stair Delta will be exit-only.

� Minimizing the visibility of the emergency exit from Cedar Drive and the Center Building.

The proposed design achieves these goals by concealing an exterior flight of stairs in an areaway leading down to the below-grade stair exit, which is oriented away from Cedar Drive to eliminate views into the exit stair. The areaway is flanked by concrete retaining walls with step lights and topped by a stainless steel cable-rail system similar in design to existing cable-rail guardrails around the Munro Building. The design of this railing minimizes the profile of the above-grade components of the stair while maintaining a previously established guardrail vocuabulary that can continue to be utlized throughout the campus during subsequent phases of development.

The exterior stair will be kept clean of debris and snow through the same campus maintenance program that clears snow from the exterior stairs on the north side of the Munro Building. A heat-trace system in the stair slab will be included to reduce the need for manual snow clearing during snowfall events.

Site photograph taken from just north of the Munro Builing entrance plaza, looking towards the area where Stair D wil exit to grade.

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Site plan showing Stair D areaway and concrete path.

Longitudinal Section through Stair D areaway.

Perspective rendering, approaching the areaway from Cedar Drive.

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LANDSCAPE

An existing egress path, paved in wood chips, between a stair from the Munro Building at the west edge of the site and the road to the east, will be removed and replaced with a new cast in place concrete walkway. Access from this walkway to the DOC A egress stair will be provided by a new connecting concrete walkway. Site lighting along both walkways will be provided by LED bollard lights to match those used at the Munro Building.

Landscape planting will include native grasses/perennials adjacent to the egress stair to match the existing planting in front of the Munro Building and turf grass to match existing planting in the “Ballfield” area above. Additionally, several trees and associated planting that will be impacted by the elevator overrun structure east of the Munro Building entrance will be replaced with new trees and planting.

CIVIL

INTRODUCTION/PURPOSE

The purpose of this portion of the document is to prescribe the civil site related construction aspects for St. Elizabeths West Campus - DOC A Phase 2 and EOC/ITOC in order to provide general guidance to the Final Construction Documents. This narrative is to be utilized along with other documents in preparation of the Construction Document package for improvements necessary to construct the civil portion of the facilities.

The limits of this contract have been identified on the site plan sheets. The Contractor will be responsible for coordinating and “tying–in” to existing conditions and any proposed work on adjacent construction projects at St. Elizabeths West Campus, such as the adaptive reuse of the Center Building, and other per the Overall Master Plan.

EXISTING CONDITIONS

CONFIRMATION OF EXISTING UTILITIES

The Contractor is to confirm/verify the locations of existing utilities within the limits of work prior to construction. The Contractor shall be responsible for maintaining active service for utilities that serve existing facilities on the St. Elizabeths West Campus prior to any proposed relocation or re–routing of those utilities around the limits of work. Following is a brief description of existing storm drainage, water service, fiber optic, and security utilities in the project area. It is assumed that all of these utilities, with the exception of the irrigation line, will need to remain operational throughout the construction of the stair improvements and excavation for the elevator structure addition. Temporary or permanent re– routing of these utilities around the proposed stair and elevator structure is anticipated. These descriptions are based on a compilation of as–built record drawings, construction drawings, and field observations. Site survey and utility location services have been completed. Proper adjustments to the project site base sheet have been made since the Design Development submission.

STORM DRAINAGE

An existing 525mm (21”) RCP storm drain runs parallel to the northwest face of the existing Munro Building and DOC Building. The storm drain carries stormwater runoff from portions of the existing DOC and Munro Building and site area to an outfall point west of the proposed stair improvements, eventually draining to the existing wet pond. It is assumed that surface runoff from the project area drains as sheet flow to the south and west, towards the slope and existing wet pond. There appears to be one (1) storm drainage curb inlet in the vicinity of the project, to the southeast of the proposed stair. Existing manhole 207D has been sealed closed; therefore, a survey as-built of the structure was not available.

An existing 250mm (10”) SDR–35 PVC pipe runs from north to south and outfalls to a swale above the proposed elevator structure addition. The storm pipe services a 100mm (4”) PVC pipe that connects to the USGC from the west.

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DHS OPERATIONS CENTER PHASE 2

POTABLE WATER

An existing 100mm (4”) water service runs parallel to the northwest face of the existing Munro Building and DOC Building and enters the DOC Building to the west of the proposed stair improvements. The service line is fed from an existing 200mm (8”) water line in Cedar Drive.

There is an existing fire hydrant near the top of the existing exterior stair west of the proposed construction. This hydrant shall remain in place operational throughout construction.

IRRIGATION

An existing 50mm (2”) irrigation line runs at a diagonal, in the northeast–southwest direction, generally along the face of the existing Munro Building and DOC building and is used to service the landscape area north of the Munro Building. This existing irrigation line diverts south and runs parallel to the Munro Building. The irrigation line runs through the center of the proposed elevator structure addition and continues south towards the existing CUP building.

FIBER OPTIC AND SECURITY NETWORK

Existing fiber optic and security cabling/conduits run parallel to the face of the existing Munro Building and DOC Building.

ELECTRICAL/ POWER:

Existing electrical line runs in the north-south direction to the east of the proposed DOC A stair. Disturbance of this electrical line is not anticipated.

CIVIL DESIGN INTENT

EROSION AND SEDIMENT CONTROL

The Contractor must be in compliance with the erosion and sediment control requirements of the District of Columbia.

PEDESTRIAN CIRCULATION:

During construction, it is the responsibility of the contractor to maintain emergency building egress and adequate pedestrian circulation. Sidewalk and/or pedestrian path closures shall be coordinated with GSA prior to closing.

It is anticipated that, during construction, the existing mulch pedestrian path along the northwest face of the Munro Building will be impacted; therefore, the civil plans propose to temporarily relocate the mulch path and existing fencing north of the disturbed area to maintain pedestrian egress from the existing stairway west of the project area to Cedar Drive. The portion of mulch trail and fence within the tree canopy of the large existing tree on Cedar Drive shall be removed carefully by hand only – no mechanized equipment shall be utilized within the tree canopy so as to protect the tree and the tree’s root zone.

A portion of the sidewalk along the Cedar Drive in the vicinity of the elevator shaft installation will be impacted for construction access and excavation; therefore, the civil plans propose to temporarily close this portion of the sidewalk and provide a minimum 5’ wide pedestrian path behind jersey barriers in the south-bound lane of Cedar Drive.

Temporary pedestrian circulation measures should remain in place until permanent routes have been established.

GRADING AND EARTHWORK

Site grading design intent has been coordinated with the project team and has been incorporated into the Construction Documents. Grading and landscaping must be designed to permit easy maintenance of the grounds. The maximum slope for turf areas is 3:1 and the minimum slope is one percent (1%). A two percent (2%) slope desirable. Slopes of greater than 2:1 should be planted with ground cover or other landscape materials to specifically control erosion. Slopes greater than 2:1 are not recommended.

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DHS OPERATIONS CENTER PHASE 2

Wherever possible, grades and slopes should contribute to the concept of universal accessibility.

Slopes of walkways and ramps along a site’s accessible routes must meet the requirements of the Architectural Barriers Act Accessibility Standard (ABAAS).

The existing grade around the DOC stair is relatively flat, with minimal slope from northeast to southwest. This project proposes to construct the proposed stair exit into the existing grade, with minimal grading in the area where the structure comes up to grade. The stair exit pathway connecting to the existing pathway north of the stair exit should be graded at or close to a two percent (2%) slope. This project also proposes to lay-back a portion of the severe slopes south and west of the new stair, softening the grade from nearly 2:1 slopes back to approx. 7:1 slopes.

Existing slope protection measures (i.e., rip rap) should be replaced in-kind, where applicable, after grading is completed. The existing fire hydrant in this area shall be protected and remain operational at all times.

The existing grade around the proposed elevator structure addition is moderate. There is a swale that flows from north to south from an existing outfall structure along the face of the Munro Building, with side slopes approaching approximately 3:1. This plan proposes to relocate the existing outfall structure and extend the swale north as part of the elevator excavation and surface restoration.

STORMWATER MANAGEMENT PROGRAM

The Stormwater Management for the proposed stair improvements is proposed to be in conformance with the program set forth in the St. Elizabeths Utility Integration Plan - Overall Stormwater Management Program by GORDON dated December 8th, 2010. Any increase in impervious area within the limits of clearing, such as walkways, driveways, new rooftop area, etc., may need to be retained and treated in accordance with the aforementioned program for Section 438 of the Energy Independence and Security Act and for the District Department of the Environment (DDOE) regulations.

The proposed improvement areas are within the drainage shed of the existing wet pond. It is anticipated that the existing wet pond, constructed with the Munro Building, will satisfy the stormwater management requirements of the proposed stair improvements.

STORM DRAINAGE

The existing 525mm storm pipe that runs parallel to the northwest face of the Munro Building will remain in place. The storm drain system shall remain in service during construction, and the contractor shall take care not to damage the existing pipe while working in its vicinity. During excavation for the stair, a portion of the pipe may need to be supported across the excavation to remain in service.

A proposed trench drain within the stair structure will be installed and connected to existing storm structure 206B via proposed 100mm (4”) PVC storm drain.

The existing 250mm storm pipe and outfall structure in the vicinity of the proposed elevator shaft installation, parallel to the east face of Munro Building, will need to be cut back approximately 8 meters and raised to the proposed grade surface.

SANITARY SEWER

The existing Munro Building and DOC Building is currently served by an existing sanitary sewer.

This project does not propose any changes or impacts to the existing sewer service to the building.

WATER DISTRIBUTION SYSTEM

This project does not propose any new water service or distribution. Permanent relocation of a portion of the existing water line on the north side of the Munro Building and in the vicinity of the DOC Stair construction has been proposed as the water service line runs through the DOC stair.

The civil plan proposes a portion of the water line relocated south, and 45 degree rolled horizontal bends to be installed on both ends of the relocated water service line. The final location of the relocated portion of the water line is intended to be above the proposed stairway shaft structure.

Water service must remain operational during construction.

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NATURAL GAS

Gas service is currently provided to the Munro Building and DOC Building from an existing gas service lateral. This project does not propose any changes or impacts to the existing gas service.

TELECOMMUNICATIONS

The existing telecom utilities enter the DOC from manholes east of the Munro Building, near the street, and should be outside of the excavation area for the stair. Telecom utilities for the Munro Building are routed well north of the limit of work and should not be impacted.

IRRIGATION

The existing 50mm irrigation line that runs through the proposed elevator structure excavation will need to be relocated. Contractor to coordinate and adjust the irrigation line during the construction. Irrigation line to be removed and replaced in–place and in–kind upon finishing construction at the location of the elevator structure.

VEGETATION:

There are several existing, young trees within the proposed limits of the project area. It is the civil recommendation that, in coordination with the Landscape Architect, any trees that may be impacted due to construction, construction access, or other land disturbance, be removed and replaced after construction. The large existing tree east of the stair construction and on the frontage of Cedar Drive shall remain and be protected throughout construction. The Landscape Architect should review the condition existing trees prior to construction and make a recommendation for removal and replacement.

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U.S. DEPARTMENT OF HOMELAND SECURITY

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U.S. DEPARTMENT OF HOMELAND SECURITY

DHS OPERATIONS CENTER PHASE 2

3 ARCHITECTURE AND INTERIOR

DESIGN

DESIGN CRITERIA

In addition to the codes referenced elsewhere in this document, the design will meet the requirements and standards of the following documents:

� 2014 PBS-P100, Facilities Standards for the Public Buildings Service

� Architectural Barriers Act Accessibility Standards (ABAAS)

Additionally, all personnel workspace within the DOC will be designed in accordance with:

� Instruction 119-02-003, DHS Workspace Standard

The design contains a number of SCIF and SCIF-like spaces, which will be designed in accordance with the following standards, in descending order from general to specific:

� Intelligence Community Directive (ICD) 705 Sensitive Compartmented Intelligence Facilities, and subsets thereof.

� DHS Instruction 121-01-001 Administrative Security Program

� DHS HQ Physical Security Construction and Equipment Specifications Handbook (May 27, 2010)

� Memorandum: Sensitive Compartmented Information Facility (SCIF) Security Requirements, DHS-OCIO-DC.12

� Memorandum: DHS – TEMPEST Assessment of DOC A SCIF at St. Elizabeths – DHS CTTA (February 6, 2015)

� Memorandum: DHS – TEMPEST Assessment of NOC SCIFs at St. Elizabeths – DHS CTTA (February 20, 2015)

DESIGN CONCEPT

ENTRY SEQUENCE

The main entrance to the DOC facility was originally intended to be located in the southeast corner of the ground floor of DOC B. A secondary entrance was provided on the Ground floor of the Munro Building off the ceremonial entry plaza, which currently serves as the only entrance to DOC A. Since DOC B will not be constructed and the current DOC A entrance is too small to adequately serve the anticipated number of occupants once Lower Levels 2 and 3 are fully fit-out, a new main entrance for DOC A will eventually need to be created. The design team investigated a number of locations for this new main entrance and ultimately concluded that a future entry lobby would be most appropriately located in the West Addition, generally in keeping with the original design intent. This future entry in the West Addition will connect via a below-grade corridor to the southeast corner of DOC A at Lower Level 1, through existing knockout panels at this location which were provided to facilitate a future connection. Once this connection is made and the West Addition is operational, elevators A3 and A4 will serve as the primary passenger elevators for the DOC facility, and the current DOC A entrance through the Munro Building will become exit-only.

Because construction of the West Addition is not expected to begin for several more years, the design team investigated options for increasing the efficiency of the existing DOC A entrance to accommodate an increased number occupants, while balancing this with egress needs. The condition shown below was selected by the design team and owner as the best way to increase entry capacity while maintaining adequate egress access, and should require relatively minor interventions in the existing space. An ADA compliant “hump” will be utilized to route conduit to each of the turnstiles without the need for trenching into the existing floor. The turnstiles will be equipped with drop-down arms to provide free exiting in the case of fire alarm. A new security desk will be provided since the existing desk is not configured well for the proposed conditions. Existing partitions separate the entrance lobby from the DOC elevator lobby; these partitions will be removed in order to create a more open interior space and ease egress access from the Munro Building through the lobby space.

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U.S. DEPARTMENT OF HOMELAND SECURITY

DHS OPERATIONS CENTER PHASE 2

The DHS Secretary will enter DOC A via a separate entry sequence. The Secretary’s office will be located in the Center Building, immediately to the east of the DOC. Concurrently with the Phase 2 project, a renovation of the Center Building will include the construction of a new stair (Stair Charlie) and elevator which will extend down to Lower Level 1 and connect to the DOC on the east side of Stair Bravo via an existing, walled-off vestibule. The connection to the Center Building and Stair Charlie will be made as part of the Phase 2 project. Once this connection is made, occupants egressing the DOC via Stair Bravo will transfer to Stair Charlie at Lower Level 1 and then exit to grade in the Center Building. At this point, the current Stair Bravo headhouse will become obsolete except for the Fire Command Room, which will remain operational.

Ultimately, a new Fire Command Room for the DOC will be included in the design of the West Addition. Once constructed, this will allow the existing Stair Bravo headhouse to be demolished.

The design team has been coordinating with the West Addition design team to convey requirements for size, location, and equipment required for the final Fire Command Room.

CBR DECONTAMINATION SUITE

In the event of a CBR incident, DHS staff (including the Secretary) will need to undergo a decontamination process before entering the DOC. A three-chamber decontamination suite consisting of a disrobing room, a shower room with 4 overhead showers, and changing room with lockers and temporary garments for occupants to change in to, will be constructed in the current location of Stair Bravo on Lower Level 1. During a CBR incident, other DOC entry points will be shut down and the decontamination suite will be the only means to enter the DOC. Construction of the CBR suite (and associated interior demolition of Stair Bravo to grade) is being carried as a construction add-alternate, and is shown in the drawings as Add-Alternate #1.

ELEVATORS A3 AND A4

A hoistway for elevators A3 and A4 was constructed during Phase 1, but the elevators themselves were never installed. As originally conceived, these elevators were designed as convenience elevators servicing only Lower Levels 2 and 3 of DOC A and B due to the relatively small amount of occupiable space on Lower Level 1. As a result, the hoistway was not designed to accommodate service to Lower Level 1. Since the DOC’s future main entrance will be in the West Addition, which will only have one story below grade and connect to the DOC at Lower Level 1, it is necessary to modify the existing hoistway to allow elevators A3 and A4 to access Lower Level 1 and become the primary elevators for the building.

Proposed DOC A interim entrance lobby at the Munro Building.

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DHS OPERATIONS CENTER PHASE 2

During the Concept Design phase, the design team studied several alternatives for providing service to Lower Level 1. An existing structural beam passes longitudinally through the back of the hoistway reducing the head clearance available for the elevator cabs.