Attachment B Santa Cruz Island Sign Fabrication Details 0909-807-CHIS.pdf

Fabrication Details for Santa Cruz Island

June, 2020

0909-807-CHIS

NPS Sign Program Harpers Ferry Center

Harpers Ferry, WV 25425

Drawings are for design-intent only. Contractor shall determine and engineer final fabrication details, which shall fulfill the required function while honoring the appearance of the drawing and provide shop drawings for approval by COR.

National Park Service | Harpers Ferry Center | NPS Sign Program A.0

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Project Number

0909-807-CHIS

Drawing Date

10/01/19

Location Number(s)

Scale Page

DIRECT-IMAGED, POWDER-COATED

ALUMINUM PANELS

Panels shall be high-resolution capable of single and or double-sided. Panels are direct imaged or image transfered using UV resistant pigments on 0.080” thick aluminum, finished with a clear baked on

VOC free powder coat, and 3/8” radius corners. Panels shall have the capability to display a matte surface. Vinyl wrapped aluminum panels are not acceptable. Panel backs will be labeled with their corresponding drawing number. The contractor will provide galvanized mounting hardware for each panel.

EE-66.0

Potable Water No Dish Washing

Carry Out All Food Scraps

EE-53.0

Restrooms

IS-39.0, EE-41.0 - Warning - 12” x 8”

CAUTION

AREA CLOSED

Hazardous Cliffs

Panel Detail

Direct-Imaged, Powder-Coated .080” Aluminum panel with mounting holes and hardware.

Aluminum edges are to be clean and free of burrs and rough edges.

3/8” Radius Corners

Direct Imaged or Image Transfered, UV-Resistant Pigments, finished with a Clear, Baked-On VOC-Free Powder Coat

Reverse Side to be Painted (drawing sheets indicate white or PMS 1615 Brown)

3/8” Mounting Holes (locations shown in drawings)

Exploded View of Post-Mount Aluminum Sign Fabrication and Hardware

A.1

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Project Number

0909-807-CHIS

Drawing Date

10/0119

Galvanized, Tamper Resistant Nut

2” x 2” x .0625” Weathering Steel Post (hollow), Bottom

End Pointed, Top End Flattened for Hammering into Ground, Holes Pre-Drilled Galvanized, Tamper Resistant Bolts

Material Fabrication Example for all Weathering Steel Signs

POST-MOUNT ALUMINUM SIGNS

Each panel and post shall be labeled with their associated sign drawing number so panels can be easily matched. Predrilled holes in panels and posts must align.

Contractor to supply galvanized, tamper-resistant hardware.

Direct-Imaged, Powder-Coated .080” Aluminum panel with mounting holes and hardware.

Non-Conducting Washers

B.0

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Project Number

0909-807-CHIS

Drawing Date

02/19/19

Scale PageMaterial Fabrication Example for all Weathering Steel Signs

TRAIL DIRECTION - PANELS

Panels shall consist of two (2) sheets of

0.075” thick weathering steel welded together. The front piece is to have laser-cut graphics per supplied sign drawings and the back sheet is to be solid.

Panel artwork must be honored.

Edges must be sanded smooth and free of burrs and sharp edges.

EE-19.0SE - Trail Direction- Southeast Side - 24” x 8” - Cap Height 1”

Qty: 1

EE-19.0NE - Trail Direction

EE-19.0SW - Trail Direction

Trail Directional - Panel Detail

.075 weathering steel w/ laser cut graphics welded to weathering steel backer w/ mounting holes & hardware.

Weathering steel post structure designed and engineered to meet requirements shown in this document.

0.075” Weathering Steel Solid Backing Sheet

Locations of Mounting Holes should be determined by contractor and shown in shop drawings. Mounting holes and hardware must not interfere with panel graphics.

Panel and solid backing sheet welded together with all welds and sanded smooth.

All Corners 3/8” Radius

0.075” Weathering Steel Front Sheet with Laser-Cut Text and Graphics

Trail Directional - Sign Structure Requirements

B.1

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

.075 weathering steel w/ laser cut graphics welded to weathering steel backer w/ mounting holes & hardware.

Weathering steel post structure designed and engineered to meet requirements shown in this document.

Project Number

0909-807-CHIS

Drawing Date

Scale

N/A

Page

Capabilities

• Signs remain upright without bracing or a concrete footer.

• Signs withstand typical winds on Santa Cruz island – up to 70mph.

• Post structures must be able to be driven into the ground using hand tools. The bottom of the post structure must be slim or tapered to make installation as easy as possible.

• Sign components must be able to be assembled and installed with hand tools only.

• Panels must be able to be removed using hand tools only.

Hardware

• Hardware must be tamper-resistant.

• All hardware required for assembly must be supplied.

• Hardware should be resistant to corrosion and non-re-active to weathering steel and/or separated from weathering steel with non-corrosive washers to ensure ease of disassembly, should the need arise.

• If use of anti-seize compound is recommended, the compound should be provided and directions for use supplied.

• Panel mounting hole locations are to be determined by the contractor and shown in the contractor’s shop drawings.

• Holes and hardware must not interfere with panel artwork.

Post Structures

• All above-ground measurements shown in the drawings must be honored.

• All structural components must be made of weathering steel.

• All structural components (stabilizing fins, etc.) must be welded together, not joined with hardware. Only panels may be attached with hardware.

• All sign post structures should penetrate the ground to a depth of at least 30 inches but not to exceed 40 inches.

• Whenever possible and when determined by an engineer to be feasible, post structures should be 2” x 2” hollow weathering steel posts with a solid top for hammering into the ground and a tapered end. See pages A.0-A.1 in 0909-807-CHIS SCI Fabrication Detail for a 2“x 2” post sample design.

Additional below-grade stabilizing structures (such as fins) may be added for stability as determined by an engineer.

• When a 2” x 2” post is not structurally feasible, the contractor will engineer an alternative structure that can accommodate the weight of the sign panels. This alternate structure must adhere to the following requirements:

• Post dimensions may not exceed 3”x 3”.

• The structure must be able to be hammered or driven into the ground with reasonable ease using hand tools only, without the need for digging or augering.

TRAIL DIRECTION - SIGN STRUCTURES

Trail Direction sign structures should be designed with sensitivity to an important cultural landscape in mind. Each sign structure should provide the least amount of ground disturbance over the smallest area possible while maintaining the structural integrity of the sign.

Trail Direction signs must be structurally sound, honor the appearance and function of the sign drawings, and be capable of being installed without mechanized equipment and without digging or augering.

Trail Directional Assembly - Sample Only

TRAIL DIRECTION - ASSEMBLY

Contractor will determine the depth to which each signpost should be buried, with

30” being the minimum depth.

Below ground measurement should be increased beyond 30” when the contractor determines additional depth is required for stability but may not excede 40”.

Above-ground measurements must be honored.

B.2

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Project Number

0909-807-CHIS

Drawing Date

1/2" = 1' - 0"

Page

GL

M in im u m D ep th

8” 4.

5”

EE-19 - Trail Direction

Northeast Side Southwest Side Northwest Side Southeast Side

C.0

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

.075 weathering steel with laser cut graphics and text welded to single piece of .125” weathering steel trailside

Project Number

0909-807-CHIS

Drawing Date

02/19/19

Location Number(s)

Scale

Half Scale

Panel Detail

WEATHERING STEEL

TRAILSIDE SIGNS

Weathering steel panels (single-sheet) to be welded to weathering steel trailside sign bases.

Page

IS-38.01, IS-44.01, EE-62.01 - Campground

0.075” Weathering Steel with Laser Cut Text and Graphics

Edges are to be clean and free of burrs.

3/8” Radius Corners

WEATHERING STEEL

TRAILSIDE SIGNS

Weathering steel panels (single-sheet, 0.075”) to be welded to weathering steel trailside sign bases.

Trailside Fabrication Detail

National Park Service | Harpers Ferry Center | NPS Sign Program C.1

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Project Number

0909-807-CHIS

Drawing Date

.075 weathering steel with laser cut graphics and text welded to single piece of .125” weathering steel trailside

18"

6"

4"

12"

1-TS - 03 Trail Side Side Elevation

Scale: Actual Size

.125 Breakformed Steel Base

2"

Panel Height

45°

.075 weathering steel with laser cut graphics and text welded to base

3/8” Radius Corners

Weathering Steel Trailside Assembly

Double Post Ground Mount Assembly

D.0

Channel Islands National Park

Description | Notes

Identity Sign

Single sided western red cedar panel with routed graphics, solid coat stain finish, 20" routed full color arrowhead, with 8" x 6" weathering steel double post assembly.

Project Number

0909-807-CHIS

Drawing Date

Page

IS-22.0 - Island Identity Fabrication Example - 82” x 32”

GL

A rr o w h ea d 82"

98"

32"

30"

8" 6"

Channel Islands National Park Prisoners Harbor National Park Service U.S. Department of the Interior

Identity Sign Base Structures

Steel Sign Structure Wood panels shall be attached to a steel post and steel mounting plate system. Sign assemblies shall be fabricat-ed with A-36, A-500B, or A-847 tubular steel upright posts (4" x 6" x 1/4" wall, 8" x 6" x 1/4" wall, or as otherwise specified)

Steel posts shall be mounted per the specified drawings.

Post length shall be cut per specified drawings. Posts shall be cut to allow flush alignment of post and sign panel.

Steel mounting plate shall be fabricated with A-36, A-500B, or A-847, x 1/4" steel plate. Internal weld edges shall be welded clean and ground smooth.

Weathering Steel Posts, post caps, and base plates shall be weathering steel. Weathering steel components should not be primed or painted.

Mounting Structures and Components Sign mounts and support structure may be made of weathering or galvanized steel. Any galvanized compo-nents must be primed and painted.

Prior to painting, steel components shall be sanded, sand blasted, or bead blasted to remove all oils, burrs, and rust. Rust shall be completely removed from all surfaces, edges, and corners. Exposed welds shall be ground clean and smooth. Cleaning of steel surfaces shall be in strict accordance with paint manufacturer’s specifications.

After cleaning, all painted steel components shall be sprayed using a VOC compliant, Mathews White Epoxy Primer (or approved equal) on all surfaces. Components shall receive a minimum of two primer coats prior to top coat finishes. Primer coats shall be applied in strict accordance with the paint manufacturer’s specifications.

Final top coat colors shall be a Matthews Satin VOC, Semi Gloss finish (or approved equal) to match PMS 1615 brown. Paint shall be applied smooth and clean with no oversprays, drips, paint runs, or bubbles. Paint shall be applied so that weep holes are clear and not plugged.

Western Red Cedar Panel With Graphics

Western Red Cedar Blank Back Panel Stained to match PMS 1615 C Brown

8" x 6" x 1/8" Thick Weathering Steel Post with Welded 3/16" Thick Post Cap and Welded 17" x 11" x 1/2" Thick Steel Base Plate

8"

3/16" Thick Steel Brake Formed C-Channel

3/16" Thick Steel Z-Clips Attached to Western Red Cedar Panels

8" x 6" x 1/8"Thick Weathering Steel Post with Welded 3/16" Thick

Post Cap

13" x 11" Weathering Steel Base Plate Welded to Steel Post

2" x 2" x 3/16" Thick Steel Structural Angle, Center Support

4 7/8"

4 7/8" eq eq

1/2"

GL

Double Post Ground Mount Assembly

Typical Construction

1 1/2"

1 1/2" 3"

Steel C-Channel Support Structure, Weathering Steel or Galvanized Steel Painted to match PMS 1615 C Brown

6"

Double Post Ground Mount Assembly

Typical Plan View

National Park Service | Harpers Ferry Center | NPS Sign Program D.1

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

06/01/20

Page

3/16" Thick Steel Brake Formed C-Channel

3/16" Thick Steel Brake Formed C-Channel

1/2" Weep Hole (For Drainage)

3/16" Thick Steel Z-Clip

3/16" Thick Steel Z-Clip

#10 x 1" Long, Stainless Steel Pan Head Slotted Wood Screw

#10 x 1" Long, Stainless Steel Pan Head Slotted Wood Screw

1 1/2" Thick, Western Red Cedar Sign Panel

2" x 2" x 3/16" Steel Center Support

4 3/16"

3 1/16"

1 1/2" 3" 1 1/2"

6"

Panel / Frame Connection

Typical Section Cut

3/16" Thick Plate Steel

3"

1 - 1/2"

Brake Formed Channel Detail

1/2 Actual Size

National Park Service | Harpers Ferry Center | NPS Sign Program D.2

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

Page

Steel support components to be Weathering Steel or Galvanized Steel painted to match PMS 1615 C brown.

18"

Post Footer Detail

Scale: 1 1/2" = 1'-0"

1/2" Thick Steel Base Plate Cut Detail

Scale: 1 1/2" = 1'-0"

1/

4"

1/

4"GL

1/2" Thick Steel Base Plate

Backfill

18" x 24" Concrete Footer

Gravel Base (For Drainage)

6" (B as ed o n

L o ca l

C o d es a n d C o n d it io n

s) 6"

5/8" Diameter Mounting Holes (Qty: 4)

Note: Cut out Hole For Post

11" x 13" x 1/2" Thick Steel Base Plate eq

1/ 8" eq

1 1/4" eq6 1/8"eq

11"

National Park Service | Harpers Ferry Center | NPS Sign Program D.3

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

3/16 3/16" Thick Brake Formed Channel

2" x 2" x 3/16" Thick Steel Corner Clip 6" x 8" x 1/8"

Thick Steel Post

3/16" Thick Steel Post Cap

3/16

Post Cap Attachment DetailCorner Clip Weld Detail

1/8" Thick Brake Formed Steel Post

3/16 8"

6"

Brake Formed Steel Post Detail

3/8-16 x 1" Long Stainless Steel Hex Head Cap Screw with Flat Washer Note: Drill and Tap Steel Post to Accept Screw

3-1.0E Channel to Post Attachment Detail

National Park Service | Harpers Ferry Center | NPS Sign Program D.4

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

3/16

3/16

1/2 - 13 Stainless Steel Hex Nut

1/2" Stainless Steel Flat Washer

17" x 11" x 1/2" Thick Steel Base Plate Welded to Post

1/2-13 x 12" Long Stainless Steel L-Hook Anchor Bolt

1/2 - 13 Stainless Steel Acorn Nut

Base Plate Connection Detail

Scale: 3" = 1'-0"

National Park Service | Harpers Ferry Center | NPS Sign Program D.5

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

1/4" Diameter Mounting Holes Along Short End of Clip

3/ 4"

1/4"

5/ 8"

2"

- 3

/8

2-1.0F

3/16" Thick Steel

5/ 8"

2"

- 3

/8

3/ 4"

1/4"

CL

10" eqeq 10"

24"

5/ 8"

- 3

/8

2"

/8

10" eqeq 10"

24"

CL

3/16" Thick Steel

1/4" Diameter Mounting Holes Along Long End of Clip

Brake Formed Bottom Z-Clip Section

Scale: 3" = 1'-0"

Brake Formed Top Z-Clip Elevation

Scale: 1 1/2" = 1'-0"

Brake Formed Bottom Z-Clip Elevation

Scale: 1 1/2" = 1'-0"

Brake Formed Top Z-Clip Section

Scale: 3" = 1'-0"

3/16" Thick Steel

National Park Service | Harpers Ferry Center | NPS Sign Program D.6

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

02/19/19

Location Number(s)

Scale

Arrowhead Fabrication Detail

D.9

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

02/19/19

Location Number(s)

Scale

1/2" = 1' - 0"

Page

Router Depth 1/8"

45°

Threaded Rod and Drywall

Anchor

Chamfered Edge

Epoxy Anchors

Use Triangle Pattern To Determine Mounting Hole Location

Sky: Not Routed

Mountain: Not Routed

Lake: Not Routed

Bison: Not Routed

Text: Routed

Chamfered Edge

Snow: Routed

Foreground and Trees: Routed

PMS 553 PMS 1615 PMS 1605White

NPS Arrowhead Routing Details

Western Red Cedar, dried to a minimum of 12% moisture content prior to fabrication. All non-routed areas remain at the surface level of the original material.

Arrowhead Chamfer Detail

Arrowhead Mounting Detail Arrowhead Mounting Side Section

1/4" Chamfer

4-4.0G

Match Colors:

Routed and Painted Wood Arrowheads

Western Red Cedar, dried to a minimum of 12% moisture content prior to fabrication. All non-routed areas remain at the surface level of the original material.

Arrowheads 12 inches tall and greater are to be 1.5 inches thick. Arrowheads smaller than 12 inches shall be 1 inch thick.

Arrowheads shall be sprayed using a VOC compliant, Mathews White Epoxy Primer (or approved equal) on all surfaces.

Wood shall receive a minimum of two primer coats prior to top coat finishes. Primer coats shall be applied in strict accordance with the paint manufacturer’s specifications.

Final top coat colors shall be a Matthews Satin VOC, Semi Gloss finish.

Panel Detail

Identity Signs: Material Overview and Fabrication Specifications

Wood Panel

45° 45°

1/

2"

Wood Panel

1/

2"

3/ 8"

Routed NPS Rawlinson Typography Section Cut

Actual Size

Routed Frutiger Typography Section Cut

Actual Size

National Park Service | Harpers Ferry Center | NPS Sign Program D.8

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

02/19/19

Location Number(s)

Scale

1/2" = 1' - 0"

Page

Typical Western Red Cedar ID Panel Details, Alternate Layout

Background Solid Color Stain to Match Pantone 1615 C

Channel Islands National Park Prisoners Harbor National Park Service U.S. Department of the Interior

Typography White 0.250" Deep Routed Dado Line

0.125" Deep, 1/8” Oversized to Accommodate Arrowhead Insert

Identity Signs: Material Overview and Fabrication Specifications

D.7

Channel Islands National Park

Description | Notes

VIS - Pedestrian Directional

Wall mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

06/01/20

Location Number(s)

Scale

1/2" = 1' - 0"

Page

Wood Panels

Western Red Cedar for NPS Park Identity Signs:

WRC for NPS Park Identity signs shall be laminated clear heart, kiln-dried vertical grain with a maximum moisture content not to exceed 12%. Cedar shall be selected per grading rules of the Western Red Cedar Lumber Associa-tion. Components of all panels including end caps shall be fabricated from the same grade.

Panel Size:

Sign panel shall be fabricated based on dimensions and format specified in the Sign Drawing Package. Panel sizes, specifications, dimensions, typography, color, and proportions shall not be altered.

Panel Assembly:

Panels shall be constructed using clear heart, vertical grain, kiln-dried wood through, glued up one board thick using 2" nominal size dimensional lumber (2" x 6", 2" x 8", 2" x 10"). Panels shall be glued using a phenolic resorcinol moisture resistant adhesive with all surface joints covered. Panels shall be clamped and cured for a minimum of 24 hours or per the manufacturers specifica-tions. Panel fabrication shall occur in air temperatures between 70 and 90 degrees Fahrenheit during drying, adhesive application, and curing.

After curing the panel vertical edges shall be finished with a 2" x 2" vertical end strip, faced glued and reinforced with 3", No 12 stainless steel Phillips flathead screws placed 8" on center. Screw heads shall be counter-sunk to a depth of 3/8" and filled with glue-in wood plugs.

After end strips have cured the panels shall be machine planed to a finish thickness of 1-1/2". All surfaces shall be finish sanded smooth and face and back edges shall rounded to a radius of 1/8".

Panels shall not be finished with hand planes, hand-held belt, orbital, or vibrating sanders.

Graphic Layout:

Graphic layout of panels shall be as shown on the attached drawings. Graphics to be accurately reproduced from plotted outline template or directly from computer to router based on full size digital vector art. Contractor shall use an accurate grid to ensure layout is aligned vertically and horizontally.

Typography shall be NPS Rawlinson Heavy and Frutiger Bold as shown on attached drawings. Typography shall not be altered, manipulated, or changed. Substitute fonts shall not be used.

NPS Rawlinson Heavy shall be Machine-routed unless otherwise specified with a 90 degree “V" router bit with a 1/8" vertical, flat sidewall inset. Routed letters shall conform to the same size artwork. Routing depth shall be uniform. Corners of type smaller than 3" cap height shall have a radius no greater than 0.0625. Type larger than 3" cap height shall have a corner radius no greater than 0.125".

Frutiger Bold typography shall be Machine-routed unless otherwise specified using a vertical-sided, flat-bottom router bit. Routing depth to be 0.375".

Vertical dados shall be routed to a depth of 0.250".

Vertical dado width shall be based on the cap height of main typography (0.0833 x cap height - .25" for 3", 0.333" for 4", .50 for 6"). Vertical dados shall be painted as specified below.

Panels receiving an NPS Arrowhead shall be Machine-routed to a depth of 0.125" using a vertical-sid-ed, flat-bottom router bit in Overbar section of panel for NPS Standard Panel layouts or Main Sign Panel for NPS Alternate layouts. Arrowhead silhouette routed in the sign panel shall be oversized by 1/8" to accommodate inset NPS Arrowhead.

All routed type, dados, and insets shall be sanded smooth and clean. All edges shall be free of burrs and all edges eased prior to application of primer coats and paint.

Paint/Stain:

Prior to painting or staining, wood shall be Machine drum sanded, not finished with hand planes, hand-held belt, orbital, or vibrating sanders. All sawdust and sanding residue shall be removed. Wood shall be properly cleaned per paint manufacturer’s instructions.

Surfaces shall be wiped clean using a Matthews (or approved equal) Speed Prep Cleaner formulated for use on wood. All panel surfaces shall be completely dry prior to primer application.

1. Main Panel Face, sides, top, bottom, and panel back shall be solid-color stained to match PMS 1615 C brown.

Must use Olympic Advanced Solid Stain and Sealant or approved equal. Panels shall receive a minimum of two coats. Stain shall be applied in strict accordance with the manufacturer's specifications.

2. Panel Typography and Vertical Dado shall be painted white, Satin finish.

3. Edges between type, dados, and flat panel sections shall be clean and sharp. Ragged edges and transitions, drips, and oversprays and not acceptable.

Double Post Ground Mount Assembly (4” x 4” posts)

E.0

Channel Islands National Park

Description | Notes

ID - Facility ID

Single sided western red cedar panel with routed graphics, solid coat stain finish, 9.25" routed full color arrowhead, with 4" x 4" weathering steel double post assembly.

Project Number

0909-807-CHIS

Drawing Date

11/25/19

Page

40"

48"

Scorpion Ranch Visitor Center Channel Islands National Park National Park Service U.S. Department of the Interior

EE-58.0 - Facility Identity

GL

30"

16" 9.25"

4"4"

Identity Sign Base Structures

Steel Sign Structure Wood panels shall be attached to a steel post and steel mounting plate system. Sign assemblies shall be fabricat-ed with A-36, A-500B, or A-847 tubular steel upright posts (4" x 6" x 1/4" wall, 8" x 6" x 1/4" wall, or as otherwise specified)

Steel posts shall be mounted per the specified drawings.

Post length shall be cut per specified drawings. Posts shall be cut to allow flush alignment of post and sign panel.

Steel mounting plate shall be fabricated with A-36, A-500B, or A-847, x 1/4" steel plate. Internal weld edges shall be welded clean and ground smooth.

Weathering Steel Posts, post caps, and base plates shall be weathering steel. Weathering steel components should not be primed or painted.

Mounting Components Sign mounts may be made of weathering or galvanized steel. Any galvanized components must be primed and painted.

Prior to painting, steel components shall be sanded, sand blasted, or bead blasted to remove all oils, burrs, and rust. Rust shall be completely removed from all surfaces, edges, and corners. Exposed welds shall be ground clean and smooth. Cleaning of steel surfaces shall be in strict accordance with paint manufacturer’s specifications.

After cleaning, all painted steel components shall be sprayed using a VOC compliant, Mathews White Epoxy Primer (or approved equal) on all surfaces. Components shall receive a minimum of two primer coats prior to top coat finishes. Primer coats shall be applied in strict accordance with the paint manufacturer’s specifications.

Final top coat colors shall be a Matthews Satin VOC, Semi Gloss finish (or approved equal) to match PMS 1615 brown. Paint shall be applied smooth and clean with no oversprays, drips, paint runs, or bubbles. Paint shall be applied so that weep holes are clear and not plugged.

4" x 4" x 1/8"Thick Weathering

Steel Post with Welded

3/16" Thick Post Cap

6.5" x 5.5" Weathering Steel Base Plate Welded to Weathering Steel Post

1/2"

GL

Double Post Ground Mount Assembly

Typical Construction

Double Post Ground Mount Assembly

Typical Plan View

National Park Service | Harpers Ferry Center | NPS Sign Program E.1

Channel Islands National Park

Description | Notes

ID- Facility ID

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

06/01/20

Western Red Cedar Panel With Graphics (single-sided, reverse solid coat stain to match PMS 1615 C Brown

4" x 4" x 1/8" Thick Steel Weathering Steel Post with Welded 3/16" Thick Post Cap and Welded 6.5" x 6.5" x 1/2" Thick Steel Base Plate

4"

4"

Brake Formed L-Bracket Welded to Post

Brake Formed L Bracket

#10 x 1" Long, Stainless Steel Pan Head Slotted Wood Screw, Contractor To Determine Number and Spacing

#10 x 1" Long, Stainless Steel Pan Head Slotted Wood Screw

4” x 4” Brake Formed Steel Post

1 1/2" Thick, Western Red Cedar Sign Panel

3"

1 - 1/2"

Panel / Frame Connection

Typical Section Cut

3/16" Thick Plate Steel

1 - 1/2"

1 - 1/2"

Brake Formed L Bracket Detail

1/2 Actual Size

National Park Service | Harpers Ferry Center | NPS Sign Program E.2

Channel Islands National Park

Description | Notes

ID - Facility ID

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

3" = 1' - 0"

9"

Post Footer Detail

Scale: 3" = 1'-0"

1/2" Thick Steel Base Plate Cut Detail

Scale: 3" = 1'-0"

1" 1"

GL

1/2" Thick Steel Base Plate

Backfill

12" x 12" Concrete Footer

Gravel Base (For Drainage)

6" (B as ed o n

L o ca l

C o d es a n d C o n d it io n

s) 6"

5/8" Diameter Mounting Holes (Qty: 4)

Note: Cut out Hole For Post

6.5" x 6.5" x 1/2" Thick Steel Base Plate eq 4" eq

6.

5"

1" eq4"eq

6.5"

National Park Service | Harpers Ferry Center | NPS Sign Program E.3

Channel Islands National Park

Description | Notes

ID - Facility ID

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date

3" = 1' - 0"

3/16

3/16

1/2 - 13 Stainless Steel Hex Nut

1/2" Stainless Steel Flat Washer

6.5" x 6.5" x 1/2" Thick Steel Base Plate Welded to Post

1/2-13 x 12" Long Stainless Steel L-Hook Anchor Bolt

1/2 - 13 Stainless Steel Acorn Nut

Base Plate Connection Detail

4" x 4" x 1/8" Thick Steel Post

3/16" Thick Steel Post Cap

3/16

Post Cap Attachment Detail

1/8" Thick Brake Formed Steel Post

3/16 4"

4"

Brake Formed Steel Post Detail

National Park Service | Harpers Ferry Center | NPS Sign Program E.4

Channel Islands National Park

Description | Notes

ID - Facility ID

Double post ground mount assembly with western red cedar panel

Project Number

0909-807-CHIS

Drawing Date