Reduced _Attach 12 - A and E Report BCWC.pdf

35% SUBMISSION

OCTOBER 2018

PAGE

Buffalo Creek Work Center Office and Engine Storage Additions

Prepared for the USDA Forest Service

OI-03 Construction Documents 100% October 15th, 2024

R

AE Report

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

Construction Documents 100% - Addendum 02 10.15.2024

PROJECT TEAM

ARCHITECTURAL

CIVIL

STRUCTURAL

GEOTECHNICAL

MECHANICAL / ELECTRICAL / PLUMBING / TECHNOLOGY

FIRE PROTECTION

SUSTAINABILITY

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

PREFACE 4

1.1 Regulations Utilized and Rationale for Selection 4

ARCHITECTURAL 6

1.1 Design Criteria 6

1.2 Preliminary Code and Life Safety Analysis 7

1.3 Options Considered for Design 8

1.4 Design Narrative 12

STRUCTURAL 14

1.1 Design Criteria 14

1.2 Options Considered for Design 16

1.3 Design Narrative 17

CIVIL 20

1.1 Design Criteria 20

1.2 Preliminary Code and Life Safety Analysis 20

1.3 Options Considered for Design 21

1.4 Design Narrative 21

MECHANICAL 37

1.1 Design Criteria 37

1.2 Preliminary Code and Life Safety Analysis 37

1.3 Options Considered for Design 38

1.4 Design Narrative 40

ELECTRICAL 42

1.1 Design Criteria 42

1.2 Preliminary Code and Life Safety Analysis 42

1.3 Options Considered for Design 42

1.4 Design Narrative 43

PLUMBING 49

1.1 Design Criteria 49

1.2 Options Considered for Design 49

1.3 Design Narrative 49

TECHNOLOGY AND SECURITY 52

1.1 Options Considered for Design 52

1.2 Technology Narrative 53

FIRE PROTECTION 55

1.1 Design Criteria 55

1.2 Preliminary Code and Life Safety Analysis 55

1.3 Options Considered for Design 59

1.4 Design Narrative 59

APPENDIX 61

1.1 C_01 FEMA FIRMette 61

1.2 C_02 Sample Septic Tank Cutsheet 62

1.3 Initial Site Visit Memorandum 63

1.4 Meeting Minutes 65

CONTENTS

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

Preface

1.1 Regulations Utilized and Rationale for Selection

1.1.1 Regulations

CODES

Occupancy”

Residential Buildings”

ADDITIONAL REGULATIONS

Code of Colorado Regulation Department of Health and Environment Regulation No. 43 – Onsite Wastewater Treatment System Regulation Regulation No. 43 will be used to design Onsite Wastewater Treatment Systems (OWTS). Rational for use:

regulatory agency responsible for permitting OWTS for the project site.

1.1.2 Rationale

Compliance and Regulatory Requirements are listed in the RFP with instruction to use the most current editions at the time of completing Contract Documents, while adhering to the most restrictive code when conflicts arise.

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

A R C H I T E C T U R A L

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

Construction Documents 90% - 02.26.2024

Architectural

1.1 Design Criteria

1.1.1 Programmatic Needs

Collectively, the design team aims to provide significant site improvements through the addition of new Office, Exercise, and Engine Storage spaces. The team will also improve the overall function of the existing Engine Bay space through additional storage options. The addition of loft storage was determined to not be feasible due to ceiling heights and structural implications.

1.1.2 Context

Architecturally, the project pays respect to the existing site and context through a regionally appropriate design.

The team has drawn upon existing site structures and the USFS Built Environment Image guide to ensure a contextually appropriate design solution.

1.1.3 Quality and Function

The design team aims to deliver a solution comprised of high-quality materials and systems to provide improved user experience in the immediate term, and a durable asset in the long term.

1.1.4 Sustainability

In collaboration with other design disciplines, the architectural team adheres to the Guiding Principles for Sustainable Federal Buildings.

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

1.2 Preliminary Code and Life Safety Analysis

1.2.1 Summary

Code and Life Safety Analysis considers the project as Group B occupancy and Type V construction type, with an occupant load of 42, requiring the following conditions:

LIFE SAFETY SYSTEMS

• Non-Sprinklered

REQUIRED OCCUPANCY SEPARATIONS

• IBC 508.3.1 and 508.3.3 o Not Required

• NFPA 88A

o Required

COMMON PATH OF EGRESS TRAVEL

• IBC Table 1006.2.1 o Required: 75’ o Provided: 72’-9”

EXIT ACCESS TRAVEL DISTANCE

• IBC Table 1017.2 o Required: 200’ o Provided: 92’

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

1.3 Options Considered for Design

1.3.1 Analysis of Initial Options

Through the proposal and predesign phases, the design team agreed with the Forest Service’s Test Fit Alternative D as an initial design direction and site solution. While agreeing with the overall design scheme, the architectural team then sought to improve functionality of the space through several schematic studies.

1.3.2 Concept Progress

Initial conceptual studies provided continuous access from the Office area to the Existing Engine Bay space, rather than separating the spaces with the Exercise room. The design team prioritized functionality and circulation while being mindful of distance to the Private Residence.

1.3.3 Concept Progress Feedback

The Forest Service provided ongoing feedback on conceptual options. Aiming to synthesize comments into one design option, we summarize the feedback as follows:

ARCHITECTURAL

Facade

• Desirable to articulate long façade architecturally through materiality and form.

Entry

• Similar to Façade comments; desirable to create an entry that is expressed on the exterior of the building and includes an interior alcove without adding a vestibule or additional area.

Exterior

• Desirable to include exterior patio space, potentially adjacent to Break Room if feasible.

PROGRAM

Office

Existing Engine Bays

Fire Prevention

Exercise

Locker Rooms

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

Radio

• Eliminate program and allocate additional space to IT Room for potential addition of radio infrastructure.

1.3.4 Final Schematic Concepts

Ultimately the design team and the Forest Service developed a shared affinity for Concepts B.1.2 and C.1.3 before electing to move forward with B.1.2.

C.1.3 Pros

Cons

18' - 0"

8'

0"

601 SF

EXERCISE17

SF

LO

CK

ER

R

O O

M

SF

LO

CK

ER

R O

O M

5'

0"

373 SF

LARGE MEETING

72 SF

WORKSTATIONS

47 SF

IT

144 SF

WORKSTATIONS

144 SF

WORKSTATIONS

72 SF

WORKSTATIONS

48 SF

TD

48 SF

TD

45 SF

ELEC

45 SF

MECH

30 SF

JANITOR

5' - 0"

163 SF

BREAK

100 SF

COPY & PRINT

SUPPLY

5' - 0"

8'

7" 8'

7"

504 SF

FIRE

PREVENTION

984 SF

CIRCULATION

4" / 1'-0" 4" / 1'-0"

4"

1' -0

9 1/4

FORES T SERV I CE

DEP A R TMEN T OF AGR I CU LT

UR

E

SHEET

OF

DESIGNER

STAMPS, LOGOS, AND SEALS

PROJECT NAME

DRAWING TITLE

CHECKED

ARCHIVE NO.

SUB SHEET NO.

DATE

UNITED STATES

DEPARTMENT OF AGRICULTURE

FOREST SERVICE

SOUTH PLATTE RANGER DISTRICT

A

B

C

D

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CONCEPT

PROGRESS -

C.1.3

C.1.3 2023.11.15

TLOVEJOY

TLOVEJOY

2022.08.11

BUFFALO CREEK

WORK CENTER -

OFFICE AND ENGINE

STORAGE ADDITIONS

ROCKY MOUNTAIN REGION

PIKE-SAN ISABEL NATIONAL

FOREST

1/8" = 1'-0"1 FLOOR PLAN

1/8" = 1'-0"2 SOUTH ELEVATION

1" = 20'-0"3 SITE PLAN

SPACE NET SF AREA

FIRE PREVENTION 505 SF

505 SF

OFFICE ADDITION GROSS = xxxx SF EXERCISE ADDITION GROSS = xxxx SF

COMBINED ADDITION GROSS = 3408 SF

FIRE PREVENTION RENOVATION GROSS = 560 SF

Room Schedule - C.1.3

SPACE NET SF AREA

EXERCISE 601 SF

LARGE MEETING 373 SF

LOCKER ROOM 174 SF

LOCKER ROOM 174 SF

BREAK 163 SF

JANITOR 30 SF

IT 47 SF

ELEC 45 SF

MECH 45 SF

WORKSTATIONS 72 SF

WORKSTATIONS 144 SF

WORKSTATIONS 144 SF

WORKSTATIONS 72 SF

TD 48 SF

TD 48 SF

CIRCULATION 984 SF

COPY & PRINT SUPPLY 100 SF

3264 SF

NO. REVISION/ ISSUE DATE

18' - 0"

8'

0"

601 SF

EXERCISE17

SF

LO

CK

ER

R

O O

M

SF

LO

CK

ER

R O

O M

5'

0"

373 SF

LARGE MEETING

72 SF

WORKSTATIONS

47 SF

IT

144 SF

WORKSTATIONS

144 SF

WORKSTATIONS

72 SF

WORKSTATIONS

48 SF

TD

48 SF

TD

45 SF

ELEC

45 SF

MECH

30 SF

JANITOR

5' - 0"

163 SF

BREAK

100 SF

COPY & PRINT

SUPPLY

5' - 0"

8'

7" 8'

7"

504 SF

FIRE

PREVENTION

984 SF

CIRCULATION

4" / 1'-0" 4" / 1'-0"

4"

1' -0

9 1/4

FORES T SERV I CE

DEP A R TMEN T OF AGR I CU LT

UR

E

SHEET

OF

DESIGNER

STAMPS, LOGOS, AND SEALS

PROJECT NAME

DRAWING TITLE

CHECKED

ARCHIVE NO.

SUB SHEET NO.

DATE

UNITED STATES

DEPARTMENT OF AGRICULTURE

FOREST SERVICE

SOUTH PLATTE RANGER DISTRICT

A

B

C

D

12345

/1

5/

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CONCEPT

PROGRESS -

C.1.3

C.1.3 2023.11.15

TLOVEJOY

TLOVEJOY

2022.08.11

BUFFALO CREEK

WORK CENTER -

OFFICE AND ENGINE

STORAGE ADDITIONS

ROCKY MOUNTAIN REGION

PIKE-SAN ISABEL NATIONAL

FOREST

1/8" = 1'-0"1 FLOOR PLAN

1/8" = 1'-0"2 SOUTH ELEVATION

1" = 20'-0"3 SITE PLAN

SPACE NET SF AREA

FIRE PREVENTION 505 SF

505 SF

OFFICE ADDITION GROSS = xxxx SF EXERCISE ADDITION GROSS = xxxx SF

COMBINED ADDITION GROSS = 3408 SF

FIRE PREVENTION RENOVATION GROSS = 560 SF

Room Schedule - C.1.3

SPACE NET SF AREA

EXERCISE 601 SF

LARGE MEETING 373 SF

LOCKER ROOM 174 SF

LOCKER ROOM 174 SF

BREAK 163 SF

JANITOR 30 SF

IT 47 SF

ELEC 45 SF

MECH 45 SF

WORKSTATIONS 72 SF

WORKSTATIONS 144 SF

WORKSTATIONS 144 SF

WORKSTATIONS 72 SF

TD 48 SF

TD 48 SF

CIRCULATION 984 SF

COPY & PRINT SUPPLY 100 SF

3264 SF

NO. REVISION/ ISSUE DATE

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

B.1.2 Pros

Cons

• Acoustic proximity of Exercise and Office Program areas

W (P

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C Cl ea no ut

PV

C Cl ea no ut

HO

US

E

610 SF

EXERCISE

81 SF

BREAK

60 SF

IT

45 SF

ELEC

40 SF

MECH

72 SF

WORKSTATIONS

144 SF

WORKSTATIONS

144 SF

WORKSTATIONS

374 SF

LARGE MEETING

72 SF

WORKSTATIONS

172 SF

LOCKER ROOM

172 SF

LOCKER ROOM

35 SF

JANITOR

24' - 0"

5'

0"

505 SF

FIRE

PREVENTION

48 SF

TD

48 SF

TD

786 SF

CIRCULATION

71 SF

COPY & PRINT

SUPPLY

11' - 0"

6'

0"

EQ EQ

81 SF

BREAK SEATING

6' - 0"

11' - 0"

90 SF

HALL

4' - 0"

/4

17' - 5"

11' - 4"

5'

1/

8"

6'

0" ø 67

1710 SF

(E) ENGINE

STORAGE

5" / 1'-0" 5" / 1'-0"

2" / 1'-0"

19' - 7" 20' - 7"

18' - 7"

9 5/8

FORES T SERV I CE

DEP A R TMEN T OF AGR I CU LT UR

E

SHEET

OF

DESIGNER

STAMPS, LOGOS, AND SEALS

PROJECT NAME

DRAWING TITLE

CHECKED

ARCHIVE NO.

SUB SHEET NO.

DATE

UNITED STATES

DEPARTMENT OF AGRICULTURE

FOREST SERVICE

SOUTH PLATTE RANGER DISTRICT

/2

9/

0:

:5

AM

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CONCEPT

PROGRESS -

B.1.2

B.1.2 2023.11.29

TLOVEJOY

TLOVEJOY

2022.08.11

BUFFALO CREEK

WORK CENTER -

OFFICE AND ENGINE

STORAGE ADDITIONS

ROCKY MOUNTAIN REGION

PIKE-SAN ISABEL NATIONAL

FOREST

1/8" = 1'-0"1 FLOOR PLAN

1/8" = 1'-0"2 SOUTH ELEVATION

1" = 20'-0"3 SITE PLAN

Room Schedule - B.1.2

SPACE NET SF AREA

EXERCISE 610 SF

LARGE MEETING 374 SF

LOCKER ROOM 172 SF

LOCKER ROOM 172 SF

BREAK 81 SF

JANITOR 35 SF

IT 60 SF

ELEC 45 SF

MECH 40 SF

WORKSTATIONS 72 SF

WORKSTATIONS 144 SF

WORKSTATIONS 144 SF

WORKSTATIONS 72 SF

TD 48 SF

TD 48 SF

CIRCULATION 786 SF

COPY & PRINT SUPPLY 71 SF

BREAK SEATING 81 SF

HALL 90 SF

3144 SF

SPACE NET SF AREA

FIRE PREVENTION 505 SF

505 SF

COMBINED ADDITION GROSS = 3438 SF

FIRE PREVENTION RENOVATION GROSS = 560 SF

NO. REVISION/ ISSUE DATE

W (P

PV

C Cl ea no ut

PV

C Cl ea no ut

HO

US

E

610 SF

EXERCISE

81 SF

BREAK

60 SF

IT

45 SF

ELEC

40 SF

MECH

72 SF

WORKSTATIONS

144 SF

WORKSTATIONS

144 SF

WORKSTATIONS

374 SF

LARGE MEETING

72 SF

WORKSTATIONS

172 SF

LOCKER ROOM

172 SF

LOCKER ROOM

35 SF

JANITOR

24' - 0"

5'

0"

505 SF

FIRE

PREVENTION

48 SF

TD

48 SF

TD

786 SF

CIRCULATION

71 SF

COPY & PRINT

SUPPLY

11' - 0"

6'

0"

EQ EQ

81 SF

BREAK SEATING

6' - 0"

11' - 0"

90 SF

HALL

4' - 0"

/4

17' - 5"

11' - 4"

5'

1/

8"

6'

0" ø 67

1710 SF

(E) ENGINE

STORAGE

5" / 1'-0" 5" / 1'-0"

2" / 1'-0"

19' - 7" 20' - 7"

18' - 7"

9 5/8

FORES T SERV I CE

DEP A R TMEN T OF AGR I CU LT UR

E

SHEET

OF

DESIGNER

STAMPS, LOGOS, AND SEALS

PROJECT NAME

DRAWING TITLE

CHECKED

ARCHIVE NO.

SUB SHEET NO.

DATE

UNITED STATES

DEPARTMENT OF AGRICULTURE

FOREST SERVICE

SOUTH PLATTE RANGER DISTRICT

/2

9/

0:

:5

AM

Au to de sk D oc s:

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SF

S Bu ffa lo

C re ek W or k

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CONCEPT

PROGRESS -

B.1.2

B.1.2 2023.11.29

TLOVEJOY

TLOVEJOY

2022.08.11

BUFFALO CREEK

WORK CENTER -

OFFICE AND ENGINE

STORAGE ADDITIONS

ROCKY MOUNTAIN REGION

PIKE-SAN ISABEL NATIONAL

FOREST

1/8" = 1'-0"1 FLOOR PLAN

1/8" = 1'-0"2 SOUTH ELEVATION

1" = 20'-0"3 SITE PLAN

Room Schedule - B.1.2

SPACE NET SF AREA

EXERCISE 610 SF

LARGE MEETING 374 SF

LOCKER ROOM 172 SF

LOCKER ROOM 172 SF

BREAK 81 SF

JANITOR 35 SF

IT 60 SF

ELEC 45 SF

MECH 40 SF

WORKSTATIONS 72 SF

WORKSTATIONS 144 SF

WORKSTATIONS 144 SF

WORKSTATIONS 72 SF

TD 48 SF

TD 48 SF

CIRCULATION 786 SF

COPY & PRINT SUPPLY 71 SF

BREAK SEATING 81 SF

HALL 90 SF

3144 SF

SPACE NET SF AREA

FIRE PREVENTION 505 SF

505 SF

COMBINED ADDITION GROSS = 3438 SF

FIRE PREVENTION RENOVATION GROSS = 560 SF

NO. REVISION/ ISSUE DATE

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

1.3.5 Design Development

SCHEMATIC DESIGN REVIEW UPDATES

Following the Schematic Design review the Forest Service made a series of changes to reconfigure the layout of the addition space, including:

DESIGN DEVELOPMENT PROGRESS

The design team then identified additional opportunities to improve the floor plan and overall efficiency through the following changes:

space available within the existing Engine Storage area.

LOFT STORAGE

Beginning in Schematic Design the design team evaluated the feasibility of lofted storage in the existing Engine Storage Room. Schematically, a minimal cat-walk style option on the north wall barely met necessary head height clearances, leaving some hope. The Forest Service Expressed interest in locating this storage on the West Side, potentially extending along the North wall in an L shape.

Upon further investigation, the required structural assembly would not provide code-required clearances at either space, and especially not at the lower roof area on the West Side. Instead, the design team will work with the Forest Service to maximize storage in the space through new shelving and lockers.

1.3.6 Construction Documents

DESIGN DEVELOPMENT REVIEW UPDATES

Based on 60% Review Comments and additional feedback, the design team refined the following aspects of the design:

Fenestration strategy

• Improved to provide a more uniform and consistent pattern, minimizing opening sizes.

Break Room Configuration

• Eliminated permanent seating to provide more flexibility and eliminate clearance concerns at entry.

• Evaluated an industrial style refrigerator, but instead included a large refrigerator and freezer combo upon request.

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

1.4 Design Narrative

1.4.1 Building Description

OFFICE ADDITION

FIRE PREVENTION ADDITION

• 560 Gross Square Foot Addition, continuous with existing building with a large opening provided on the East Wall.

• Roof continuous with existing building.

1.4.2 System and Component Descriptions

SHELL

• High performance building envelope to meet Sustainability goals and reduce mechanical loads, meeting or exceeding minimum requirements set forth by the Sustainability team:

o R-40 Roof Insulation o R-19 + R-13 continuous Wall Insulation o U-0.027 Window Assemblies

PHOTOVOLTAIC

• 10kw Array included as an Optional Bidding Item. Purchase of RECs from CORE as Base Bid compliance path if Photovoltaics are not pursued.

INTERIOR

1.4.3 Materials

durability

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

S T R U C T U R A L

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

Structural

1.1 Design Criteria

1.1.1 Governing Building Code: 2021 IBC and referenced codes

1.1.2 Risk Category: Risk Category II

The facility provides storage for Forest Service fire trucks but does not provide emergency response to civil emergency situations, does not provide living quarters for first responders, and is not connected to emergency dispatch services. Based on this criteria, the building falls under Risk Category II.

1.1.3 Design Loads

Dead Loads: The design dead loads are in accordance with the requirements of IBC 2021 and ASCE 7-16 and will include the structure self-weight and allowance for roofing, future installation of photovoltaic panels and C/L/M/E (ceiling, lights, mechanical piping and ducts, electrical)

Live Loads: The design live loads are in accordance with the requirements of IBC 2021 and ASCE 7-16. The workstation areas, meeting rooms and break room will be designed for 50 psf reducible. The exercise room will be designed for 100 psf non-reducible. The new fire prevention bay will be designed for 150 psf non-reducible.

Seismic Loads: The design seismic loading is in accordance with IBC 2021 and ASCE 7-16 using the following parameters:

rated for shear resistance)

Wind Loads: The design wind loading is in accordance with ASCE 7-16 and recommendations from the SEAC (Structural Engineers Association of Colorado) endorsed Colorado Front Range Gust Map prepared by Peterka (2006).

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

Snow Loads: The design snow loading is in accordance with ASCE 7-16 and the recommendations of the SEAC endorsed Colorado Design Snow Loads Manual prepared by the SEAC Snow Load Committee in 2016.

1.1.4 Foundation Design Criteria

The foundations for this structure will be designed in accordance with the geotechnical report prepared by Yeh and Associates, Inc., Number 223-371, dated 1/15/2024. The geotechnical report provides the following design criteria:

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

1.2 Options Considered for Design

1.2.1 Option 1: Wood Framed (selected option described in more detail in Section 0.3) Pros:

Cons:

0.2.2 Option 2: Structural Steel Framed

Pros:

Cons:

0.2.3 Option 3: Cold-Formed Metal Framed

Pros:

Cons:

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S

1.3 Design Narrative

1.3.1 Roof Framing

A wood framed roof system consisting of 5/8” plywood sheathing supported on a combination of pre-engineered wood trusses at 24” on center (majority of roof area) and TJI Joists (over locker rooms and northwest patio) has been selected and is considered the most efficient roof framing system for the building. The trusses framing plan N-S over the workstation area are supported at their plan north end by a wood girder truss spanning over the workstations. Trusses are connected to bearing walls with Simpson tie downs. A folding partition wall is located in the meeting room area. The trusses supporting the folding partition wall have been designed for an additional weight of approximately 200 plf with a live and snow load maximum deflection criterion of 1/8” per 12 ft of opening width. The roof over the new engine bay features a ridge vent. The roof over the office addition does not have a ridge vent.

0.3.2 Wall Framing

Typical structural bearing/shear wall framing consists of 2x6 studs at 16” on center with a single bottom plate and double top plate ((2) 1 ¾ x 5 ½ LVL). Interior and exterior structural walls are sheathed with 1/2” plywood.

As requested by the USFS, we have studied the pro’s and con’s of using ZIP Sheathing for the roof and wall exterior sheathing in lieu of standard plywood sheathing. Per the ZIP Sheathing ESR Report 3373 Section 4.6, ZIP System R-Sheathing panels may be used in the construction of wood shear walls with earthquake load resistance determined using the maximum values of R = 2.0 as compared to an R = 6.5 which is used when standard wood structural sheathing is used. What this means is the seismic design forces that we would need to design for with the ZIP Sheathing system would be 6.5/2.0 = 3.25 times those required when using a standard wood structural sheathing system. This will mean additional retrofit requirements for the existing structure, larger foundation elements under the shear walls and increased nailing throughout the entire structural system. For this reason, we did not proceed with the use of Zip Sheathing for shear walls on this project. We also studied the use of SIP Panels (Structural Insulated Panels) for the wall construction on this project. SIP panels come in a max panel size of 8’-0” x 24’-0”. Since the elevation of the top plate of the new exterior walls is greater than 8’-0”, we cannot take advantage of the increased construction/labor economy found with placing SIP Panels horizontally. The SIP panels would need to be placed vertically which means that we will need a new panel every 8’-0” around the building perimeter instead of every 24’-0”. For this reason, we did not proceed with the use of SIP Panels on this project. The typical door and window openings have headers built up of (3) 2x6 and 2x6 trimmer/king studs as specified in the CD drawings. The larger openings have headers consisting of built up LVL’s or PSL beams with 2x6 trimmer/king studs as specified in the CD drawings.

0.3.3 Lateral System

Lateral loads are resisted by 2x6 plywood walls sheathed with 1/2” plywood with blocked edges connected to studs and blocking with 10d @ 4” on center at panel edges and 10d @ 12 inches on center in the field. Simpson hold-downs are located at each end of each shear wall. (See plans for additional information)

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0.3.4 Foundations

The foundation design for this project is based on the criteria provided in the geotechnical report prepared by Yeh and Associates, Inc. The foundation system consists of concrete stem walls on continuous footings.

The exterior walls will be supported by 8” thick by 3’-0” tall stem walls on 12” thick by 2’-0” wide continuous footings. The interior structural walls are supported by 6” thick by 1’-0” tall stem walls on 12” thick by 2’-0” wide continuous footings. The heavier loaded walls (including some shear walls) have 12” thick by 3’-0” wide continuous footings.

The slab-on-grade at the areas west of the existing engine storage room is 4” thick reinforced with 6x6 W2.9xW2.9 welded wire reinforcement. The slab-on-grade at the new fire prevention room is 6” thick reinforced with #4 rebar at 12” on center each way. The new pad for the existing propane tank will be a 12” thick slab-on-grade reinforced with #4 rebar at 12” on center each way, top and bottom.

0.3.5 Modification of Existing Structure

We anticipate the addition of one new large opening in the east wall of the existing engine storage building.

The addition of this opening will require localized cutting and reframing work including a new 5 ¼ x 11 7/8 PSL header and new trimmer and king studs either side of the opening. We anticipate (3) smaller door openings to be made in the northwest corner of the existing building. There are a couple existing exterior wall openings in the existing engine bay that will be infilled with 2x6 framing and sheathed with sheathing to match the existing wall construction. The contractor will need to field verify the existing structural wall and roof construction (nails size, spacing, sheathing thickness etc., including the as-built location of any shear wall hold-downs and boundary posts) to ensure that additional strengthening of the existing exterior walls is not required. We anticipate the need for at least (2) new hold downs at each of the existing engine bay exterior walls.

End of Structural Narrative

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C I V I L

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Civil

1.1 Design Criteria

1.1.1 Site and Building Interaction

As part of the development of the site, the interaction between the building addition and the existing facility is important. There are several elements that will be impacted by the building addition, in particular the water, sewer, propane, and electrical utilities.

1.1.2 Maintenance of Utilities

To be further refined.

1.2 Preliminary Code and Life Safety Analysis

1.2.1 Floodplain Analysis (FEMA)

The project site sits adjacent to the Buffalo Creek and the parcel itself encompasses a portion of the Buffalo Creek. FEMA Flood Insurance Rate Map (FIRM) No. 08059C0470F with an effective date of February 5, 2014, shows the site with flood hazard zones; Refer to Appendix C_01. The flood zone boundaries are shown on the FS provided survey. Three flood zones that are present:

• Special Flood Hazard Area (SFHA) Zone AE which is defined as “the base floodplain where base flood elevations are provided”. Zone AE encompasses the Buffalo Creek and base flood elevations range from 6653 feet at west property corner to 6647 feet at the north property corner. It is estimated the base flood elevation is approximately 6650 adjacent to the building expansion. The building expansion will maintain the existing Finish Floor Elevation (FFE) of

6664.85 which is well above the adjacent base flood elevations in Buffalo Creek.

• Moderate Flood Hazard Zone X (Shaded) which is defined as “the areas between the limits of the base flood and the 0.2-percent-annual-chance (or 500-year) flood”. This is a small strip between the Flood Zone and AE and the site towards the north end that is within Zone X (Shaded). Does not impact the building expansion.

• Minimal Flood Hazard Zone X (Unshaded) which is defined as “The areas of minimal flood hazard, which are the areas outside the SFHA and higher than the elevation of the 0.2-percent-annual-chance flood. The entirety of the building expansion lies within Zone X (Unshaded).

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1.3 Options Considered for Design

1.3.1 Site Septic

The site septic system can be sized for different scenarios. Three different scenarios have been considered. The plan will show the base bid and first bid alternate. The following demand scenarios were considered:

• Base Bid – This scenario would account for sewer loading for the Engine Building with Addition, Office, and Residence with two occupants. This will have the least amount of demand and will require the least amount of infrastructure to handle the loading.

• Bid Alternate 1 – This scenario would include the base bid demands and add the future demands when the residence is remodeled with an additional capacity of eight people.

• Bid Alternate 2 - This scenario would include the base bid and bid alternate 1 demands and add the future demands when a new barracks building is built with a capacity of ten people.

The demands from Bid Alternate 2 would require a second treatment bed as the length required for the field would exceed the maximum length allowed by Jefferson County.

1.3.2 Site Building Placement

Given the site constraints, the site building placement has been set by the architect. No additional options were considered.

1.4 Design Narrative

1.4.1 Site Drainage

The site is located adjacent to Buffalo Creek, which flows in a northeasterly direction. There is a quite a bit of relief on the project site and the surrounding areas. The northwest portion of the site drops off adjacent to Buffalo Creek. The site generally slopes from the southwest to the northeast. There is a roadside ditch on the north side of County Road 126 (CR126) that slopes northwesterly and discharges into Buffalo Creek (Figure 1). A 36” diameter culvert is present under the driveway entrance to the facility (Figure 2). Offsite flows from CR126 are intercepted by the ditch and culvert and do not enter the Project Site.

A rock wall on the southeast property line extends to just beyond the Hazmat building and generally prevents stormwater from the adjacent properties to the southeast from entering western portion of the site (Figure 3).

Offsite flows do enter the site towards the east portion of the site, in particular on the northeast side of the barracks building. There is accumulated sediment in this area and it appears some maintenance has been done recently (Figure 4). This area is outside of the proposed work area, and it is assumed this project will not attempt to remediate any of the drainage issues at/adjacent to the Barracks building.

Onsite drainage generally sheet flows to the north and northeast portion of the site towards the Barracks

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S building. There is a small sidewalk scupper that allows the drainage to continue to the north towards Buffalo Creek (Figure 5). This area is fairly flat and during an initial site walk Mr. Phil Krieble, Forest Service District Engineer, indicated water does tend to pond and the area does get muddy during periods of wet weather. It was suggested that some grading improvements in this area would help alleviate this issue.

Mr. Krieble didn’t seem to recall any recent issues with site drainage with respect to the Engine Storage building.

The Engine Storage building is located outside of a FEMA flood hazard zone and is within Zone X (Unshaded) which is defined as being outside of the 500-year floodplain. With the building expansion it is important to provide a defined drainage path for onsite flows that may have otherwise sheet flowed across the expansion footprint. One thing Mr. Krieble mentioned was potentially doing a concrete apron for the portion of the building adjacent to the apparatus bay doors. This would allow us to control grades more precisely and direct runoff away from the building.

On the northwest side of the site the building pad will need to be built up as the existing ground is sloping away at this area. Tie in slopes will be per the geotechnical report and set back enough for adequate access around the facility.

Figure 1: Roadside Ditch Adjacent to Highway

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Figure 2: Culvert at Driveway Entrance to Site

Figure 3: Rock Wall Along Southeast Property Line

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Figure 4: Accumulated Sediment and Drainage Maintenance Activities NE of the Barracks

Figure 5: Sidewalk Scupper Northeast of Engine Storage Building

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1.4.2 Water Utility

The site is served by the Buffalo Creek Water District (BCWD) utility provider whose water system is confined to the Buffalo Creek area. A single fire hydrant is present on the southeast property line near the midpoint and adjacent the hazmat storage trailer (Figure 6). A fire hydrant meter is attached to the fire hydrant to measure usage when the fire apparatus water tanks are filled. It was mentioned that with the original engine storage building construction it was necessary to relocate a portion of a 4” water line that traverses the site. Original design drawings show the water main relocation northeast of the building footprint, and the new pipe size is 6”.

An existing ¾” service connection and meter supply the Engine Storage building and there is a shutoff valve at the stub from the 6” water line (Figures 7 and 8).

The expansion to the northeast of the Engine Storage Building will require modifications of the existing water main as well as replacement of the service line and meter (new meter size and service line to be determined).

The modification will need to be designed and permitted through BCWD. Construction of the water system modifications will require impact to the existing system so close coordination is required to limit disruption to the facility any downstream users. Further description of the existing water system, as well as demand analysis is provided in the Water & Wastewater Capacity Memorandum (JVA Memo) prepared by JVA Consulting Engineer dated June 5, 2023.

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Figure 6: Existing Fire Hydrant Near Hazmat Storage Building

Figure 7: Water Meter Readout (Meter is in the Engine Storage Building)

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Figure 8: Shut Off Valve at Engine Storage Building

1.4.3 Sewer Utility

Buffalo Creek Work Center is not served by a gravity sewer system and relies on two onsite wastewater treatment systems (OWTS) to manage site generate sewage. The site has numerous sanitary sewer facilities which are described in greater detail in the JVA Memo. A summary of the two OWTS:

• OWTS A Components:

o 1,250-gallon septic tank serving the residence building and the office building o 1,000-gallon septic tank serving the engine building o 1,000-gallon lift station and associated controls o A 1,350 square foot soil treatment area (STA) o Associated gravity and pressure sewer piping

• OWTS B Components:

o 2,000-gallon septic tank serving the barracks building o 1,200-gallon septic tank serving the barracks building o 1,200-gallon lift station and associated controls o A 1,300 square foot soil treatment area (STA) o Associated gravity and pressure sewer piping

Discussion with Mr. Krieble indicated that the mounded leach field appears to be working adequately. There were no obvious signs of daylighting of effluent or the presence of odors during the initial site visit and Mr.

Krieble described the same conditions during his tenure at the Work Center. The Engine Storage building is served by OWTS A and all elements for the OWTF A including, the septic tank, lift station, controls and leach field (Figures 9 through 12) appear to be in working order as indicated in the JVA memo. Although OWTS A is working adequately, there are no as-built documents, design reports or permits associated with the facility and

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S the age is unknown. Due to the additional loading with the building expansion and the need for removal of the septic tanks and lift station, it is assumed that OWTS A will be removed from a service and a new OWTS will be designed and installed including a new soil treatment area (STA). It should also be noted that the statement of work mentions that “the OWTS are at, or near, the end of their anticipated service life(s)”.

The new OWTS (OWTS 1) will be designed based on state regulations. Demands are quantified Table 1 Below and are the three scenarios presented earlier in the report described.

Table 1: Sewage Demands

Demand Source Demand Rate (gpcpd) Unit Total Demand (gpd) Existing House 50 4 200 Existing Office 15 8 120

Expanded Engine Building 15 10 150 Total Base Bid 470

Renovated House 50 8 400 Total Bid Alt 1 (+ Base Bid) 870

Future Barracks 50 10 500 Total Bid Alt 2 (+ Bid Alt 1) 1370

A new septic tank(s) will be required, and the septic tank size is sized based on a 48-hour detention time per state regulations. The three scenarios are quantified in Table 2 on the following page and the total volume can be accomplished via multiple septic tanks if desired.

Table 2: Septic Tank Requirements

Scenario Demand (GPD) Required Detention Time (hr) Septic Tank Size Required (gal) Base Bid 470 48 1880 Bid Alt 1 870 48 3480 Bid Alt 2 1370 48 5480

For the base bid of 470 gpd demand, this equates to a septic tank size of 2,000 gallons. The most efficient method to is to install a single three compartment tank which includes a pump to lift the sewage to the new STA.

There are local vendors who provide a complete package septic tank and lift station including controls (refer to Appendix C_02 for an example vendor’s cut sheet for a tank that would meet the requirements). For Bid Alt 1, an additional tank can be added upstream of the base bid septic tank which would drain to the 2,000-gallon three compartment tank as part of the base bid. For Bid Alt 2, it is anticipated that separate STA would be required given the STA sizing limitation (discussed later in this section). A new single three compartment 2,000 tank which includes a pump to lift the sewage to the new STA would serve the future barracks only. No consideration for the location of this tank was provided given the uncertainty with this future programming.

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A new mounded bed (Wisconsin Mound) STA will be constructed to dispose of the effluent from the septic tank / lift station. A geotechnical engineer will need to dig test pits during the construction phase in the anticipated STA to classify in-situ soils, which will then be used to determine the long-term absorption rate (LTAR) and subsequently the square footage of the STA. We have assumed that the soils are favorable given historically data and can provide LTAR of 0.8 Gal/sf/day and sizing presented in Table 3 on the following page reflect this. The test pit that will be dug during the construction phase and the resulting LTAR will be compared to the assumptions during design and any adjustments needed to the STA size will be addressed during construction, if needed.

Pressure sewer pipes will be routed from the lift station to the STA and a distribution valve will dose effluent to the zones within the mound. Generally, the mounds are limited to 12-feet in width and mound lengths can be up to 150-feet. A preliminary location for the mound is next to the OWTS B mound and in the same orientation, which generally follows the contours west of the residence.

Table 3: STA Sizing Requirements

Scenario Demand (GPD) Assumed LTAR* Size Adjustment Factor STA Size (sf) STA Length Rq’d ** Base Bid 370 0.8 1.2 555 46.25 Bid Alt 1 770 0.8 1.2 1155 96.25 Bid Alt 2 1270 0.8 1.2 1905 158.75

* No Geotechnical Data Provided to DOWL ** Using 12’ wide mound

As mentioned earlier in this report, when the demands of the future barracks are added to the current demands and the demands from the house renovation, the STA footprint exceeds 150’ in length. As such, when, and if, the future barracks are constructed a new separate OWTS would be designed.

It is important to note that construction and installation of the OWTS New components will require coordination with site staff as it is anticipated that there will be long period(s) of disruptions to the Office Building and Residence sewer services. This can be mediated with temporary portable restrooms or instructing staff to use the facilities in the Barracks.

Additionally, the Colorado Department of Public Health and Environment’s (CDPHE) Water Quality Site Application Policy 6 (WQSA-6) was reviewed with respect to the site. The WQSA-6 addresses facilities with multiple on-site wastewater systems with an aggregate average demand greater than 2,000 gpd. For facilities exceeding 2,000 gpd, the WQSA-6 requires additional separation between facilities based on the horizontal influence area and would require a site-specific analysis. The BCWC facility has two systems: The existing system, OWTS B has an average demand of 800 gallons per day, while the new system is designed for a demand of 470 gpd. For this phase of work, the total demand would be 1,270 gpd, which is less than the 2,000 gpd threshold criteria noted in the WQSA-6 policy. Future demand considerations would include the renovated house which would increase the demand by 400 gpd and still be less than the 2,000 gpd criteria (1,670 gpd). The future barracks would likely approach and may exceed the threshold criteria of 2,000 gpd. Given the uncertainty both

B U F F A L O C R E E K W O R K C E N T E R - O F F I C E A N D E N G I N E S T O R A G E A D D I T I O N S with timeframe, layout and demands with the barracks and the likelihood that a new system would be required to serve this future building, evaluation of the systems as outlined in the WQSA-6 policy is not required.

Figure 9: Existing 1000-Gallon Septic Tank adjacent to Engine Building

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Figure 10: Existing Lift Station near Residence

Figure 11: Existing Lift Station Control Panel on Residence Exterior

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Figure 12: OWTF A Mounded Leach Field

1.4.4 Dry Utilities

Dry utilities present on the site included overhead power lines and power poles, telephone pedestals and various propane tanks and lines.

The power poles and overhead power lines are in close proximity to the existing Engine Storage Building (Figures 13 and 14). Reconfiguration of these electrical facilities as part of the building expansion will be required. CORE Electric Cooperative is the electrical provider, and the Forest Service has been in contact with CORE so they are aware of the project. It is important to note that engaging CORE early on during the design process could potentially identify any long lead items necessary for the site power reconfiguration as well as understanding their design and construction schedules. We will show their proposed facilities on our plans for reference.

Two telephone pedestals are located on southeastern property line with one located about midpoint (Figure

15) and a second towards the northeast parcel corner. Telephone facilities are routed underground to various locations throughout the project site.

There are numerous propane tanks located throughout the BCWC. In particular, there are two propane tanks next the existing Engine Storage building that also serve the building (Figure 16). These tanks conflict with the new building expansion and will need to be relocated.

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Figure 13: Power Poles with Meter Equipment near Engine Storage Building

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Figure 14: Power Poles and Overhead Electric Lines near Engine Storage Building

Figure 15: Telephone Pedestal on the Southeastern Parcel Line

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Figure 16: Existing Propane Tanks near the Engine Storage Building

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M E C H A N I C A L

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Mechanical

1.1 Design Criteria

1.1.1 Quality, Function, and Sustainability

The design team will provide mechanical systems with a focus on quality, function, maintainability, and sustainability including collaboration with the other design team disciplines to adhere to the Guiding Principles for Sustainable Federal Buildings.

1.2 Preliminary Code and Life Safety Analysis

1.2.1 Ventilation, Heating, and Cooling will be provided per Codes and Regulations.

1. The equivalency report for the enclosed parking garage ventilation in reference to NFPA 88A was accept-ed by the AHJ. The cfm airflow rate for the minimum, constant ventilation is higher than that required by the IMC. The higher airflow rate of 1 cfm/sf will be only upon CO/NO2 alarm detection. Note that the higher airflow rate does not have heating for the makeup air. The continuous 1 cfm/sf as required by NFPA 88A is not included in this design.

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1.3 Options Considered for Design

1.3.1 Common HVAC Systems for all Options Below:

1. Untreated outside air to mix with return air to provide ventilation to zones through the furnaces, total approximately 800 cfm.

2. Exhaust in locker rooms, Janitor’s closet, and Break Room total approximately 440 cfm

3. Ventilation for Engine Bays and Fire Protection areas, approximately 360 cfm (2 times minimum IMC re-quirements) for continuous standby and 2150 cfm (1 cfm/sf) for full ventilation. Full ventilation will only happen upon CO/NO2 detection.

4. No requirements for demand control ventilation

1.3.2 Selected, Option A: Hybrid Propane and Electric

2. Engine Bays and Fire Prevention spaces (Existing and New)

a. Propane fired radiant heaters, to match existing. After reports of the existing radiant heaters being potentially oversized and providing high surface temperatures that caused damage in the past, a low surface temperature radiant heater will be considered for the final submittal (not included in the 90% documents).

b. An Add Alternate is included to replace the existing radiant heaters in the Engine Bays.

c. Ventilation: Constant Standby rate (0.15 cfm/sf) and Full rate (1.0 cfm/sf) exhaust controlled by

CO and NO2 detection per IMC and IECC

i. Wall mounted supply fan for makeup air at standby exhaust rate with electric heating coil on the to temper the outside air. A louver with a motorized damper will open CO/ NO2 detection to allow for the higher rate ventilation cfm. The makeup air for this high-er ventilation rate is not tempered.

3. Exercise Room

a. Electric unit heater, no cooling.

b. Wall mounted oscillating propeller fan for air circulation.

4. IT Room

a. Split System DX Cooling/Heat Pump

5. Offices, Meeting Rooms, Locker Rooms and Other Spaces

a. Propane furnace (ducted) with standard heat pump

b. Three Zones:

i. Meeting Rooms

ii. North Offices and Break Room

iii. South Offices/Locker Rooms

6. The heat pump will provide heat in moderate outside air temperatures and the propane furnace will take over the heating in colder temperatures. The switchover will occur at approximately 35-40 degrees F.

7. The heat pump will also provide cooling.

8. Ventilation:

a. Outside air is ducted to mix with the return air before being ducted to the Furnace intake.

B U…