Community Planning & Development Pre-Review
Landmark Preservation Pre-Review 3/15/16 The pre-review is meant to notify applicants of the process for the eight special project types noted below and offer initial feedback. Design review for this project will not begin until the final complete application is received. Staff’s initial comments do not constitute design review or approval/denial.
Property Address(es)
Property q 1 or 2 Unit Building q Multi-Unit Historic District Name Type/Use (Single Family Home, Duplex) Residential (if known) q Commercial, Mixed-Use or Multi-Use q Other Contact Name and Company
Email Address
Phone Number (area code first) Please indicate the project type: q Infill Construction q Zone Lot Amendments q Second Floor (Pop-Top) Additions q Historic Window Replacement q ADU Construction q Large Additions q Demolition in Historic Districts or Landmark Structures q Comprehensive Sign Plans *Only these eight project types require a pre-review, or as determined by staff* Description of Project Concept:
Pre-Review Checklist The following is REQUIRED for Pre-Review: q 1. Complete Application for Pre-Review q 2. Plans/drawings/sketches that adequately depict the project (clearly note existing and proposed) q 3. Color photos of existing conditions Please note: if the proposal includes demolition of an existing structure, a separate demolition application will need to be submitted for approval. Staff will schedule a meeting, call, or communicate via email for the pre-review meeting.
To submit electronically: Email this form and supporting materials to [email protected]. Electronic submission should include two attachments: one pdf with the completed form (“yourname-preapp.pdf”) and one pdf that combines all supporting materials (“yourname-preapp-materials.pdf”). File size should not exceed 25MB combined. Contact us if you are having trouble with your electronic submission. To submit in person: Submit this form and supporting materials to the Records Counter weekdays between 7:30am and 4:30pm on the 2nd floor of the Webb Municipal Building, 201 W. Colfax Ave.
201 W. Colfax Ave., Dept. 205 Denver, CO 80202 720.865.2709 or [email protected] Community Planning & Development Infill Checklist Part 1
Landmark Preservation 1/4/16 Infill Part 1: Mass, Form & Context Checklist The purpose of this step is to review the building envelope and basic exterior appearance concept to ensure a contextual fit.
Project Address: ______Pre-Application Date: ______Registered Neighborhood Organization: ______
Meeting Held Date: ______
REQUIRED for Mass, Form, and Context Review: Note: All drawings must have a scale, and the scale must be accurate printed out at a maximum 11” x 17” size. All plans must be clearly labeled with hightlighted titles. q 1. Complete Application for Design Review q 2. Complete Infill Checklist Part 1 q 3. Digital submission of all required documentation q 4. Site plan with scale (1” = 40’ or larger if possible). Include existing/proposed driveways and curb cuts. Show mechanical equipment locations. Include spot elevations delineated at existing grade. (This is required to establish the base elevation, and evaluate height within the historic context and ensure that the ordinance-prescribed height limits for the project are met.) n/a q 5. Interior floor plans with scale (1” = 40’ or larger if possible). Include all levels/floors. Please omit any/all furniture from the plan and use simple room titles (bedroom, bathroom, etc.). q 6. Color photos of existing conditions, clearly labeled showing proposed building site and surroundings. n/a q 7. Worksheets for Context, Composision, and components of Proposed Infill (Attached): q Ground Plan Comparison is a plan sheet providing footprint sizes and street/side setbacks for the immediate and See adjacent block face(s). Preliminary q Streetscape Drawings compare the size & dimensions of a building in elevation to other buildings on the same block Plans. face(s). q Compatibility Demonstration compares the proposed structure with existing historic structures in the area. This can be any contributing structure in teh district boundary, not just adjacent structures. q Character Defining Features is a detailed comparison of the proposal and the district’s Character Defining Features. q 8. Isometric Drawings (3D), should be provided at key public/street level views and at an average pedestrian height. Additional aerial view isometric drawings are required if the entire building mass is not evident by public level views. Note: A physical model may be provided to compliment, but not substitute, for isometric drawings. q 9. Elevations with overall dimensions and floor/ceiling heights denoted; show window/door openings; demarcate porches, awnings, and major protrusions or indentations. Provide at least 1” = 30’ scale. No materials, siding or other details unless important to denote scale or to distinguish solid and void surfaces. q 10. Other (as required by staff). ______. Coordinate with staff to determine if any additional information is needed due to the unique circumstances of your project.
For multi-unit (three [3] or more units) or commercial structures, also include: n/a q 11. Street sections for each distinct building mass, 1” = 20’ scale or larger. Width should extend from the center of ROW to at least the front 15’ depth of building. Demarcate property line and street edge. Show all façade height step backs, indentations and major protursions, such as awnings, balconies, etc.
Please note: Signage and outdoor seating are separate reviews.
201 W. Colfax Ave., Dept. 205 Denver, CO 80202 720.865.2709 or [email protected] Community Planning & Development Application
Landmark Preservation LANDMARK CERTIFICATE OF APPROPRIATENESS – Application 3/15/16 Design review for this project will not begin until a complete application and required submittal materials are received. Landmark Preservation reserves the right to delay consideration and/or action on a submittal in the event that information is missing and/or changed at the time of the scheduled de- sign review or public hearing. Please use the appropriate project checklist for guidance. A pre-application review is required first for certain projects.
SUBJECT PROPERTY INFORMATION Property Address
Property Type/Use q 1 or 2 Unit Building (Single Family Home, Duplex) Historic District q Commercial q Multi-Unit Residential q Other
Applicant Name: Street: Company: City: Phone: Zip: Email ITEMIZED LISTING OF PROPOSED WORK ITEMS - only listed items will be reviewed: [Example: Replace roof shingles, Construct 2-car detached garage, etc.] Only work listed below will be considered.
q q
q q q q
Materials of work: (Example: Type of window materials, siding, roofing, etc.) q
q
q
Amount of demolition of original features/materials q square feet APPLICATIONS ARE NOT CONSIDERED COMPLETE UNTIL ALL INFORMATION REQUIRED ON THE APPROPRIATE SUBMITTAL CHECKLIST IS SUBMITTED I attest that no additional exterior work or window work will occur under this application (sign, and print application).
Design Review Deadline: The filing deadline is 4 weeks prior to scheduled Landmark Preservation Commission (LPC) meetings, and 23 days (3 weeks and 2 days) prior to the first Thursdayof each month for the Lower Downtown Design Review Board (LDDRB). A complete application, including full supporting documentation, is due in the Landmark Preservation office by 12:00pm (noon) on the filing deadline. Landmark staff will determine whether LPC or LDDRB review is required based on adopted design guidelines. Staff will contact the applicant regarding staff comments, meeting dates (if applicable) and any additional materials that may be required. To submit electronically: Email this form and supporting materials to [email protected]. Electronic submission should include two attachments: one pdf with the completed form (“yourname-app.pdf”) and one pdf that combines all supporting materials (“yourname-app-materials.pdf”). File size should not exceed 25MB combined. Contact us if you are having trouble with your electronic submission. To submit in person: Submit this form and supporting materials to the Records Counter weekdays between 7:30am and 4:30pm on the 2nd floor of the ebbW Munici- pal Building, 201 W. Colfax Ave.
All submittals become the property of the City & County of Denver. Submittals are open records. Submittals will be posted online or made available to any party that requests a copy. 201 W. Colfax Ave., Dept. 205 Denver, CO 80202 720.865.2709 or [email protected]
Memorandum
Landmark Preservation: Infill Part 1 Application
Subject Landmark Preservation: Infill Part 1 Project Name Red Rocks South Ramp Structures Application
Attention Brittany Bryant Project No. 201841177 / WVXY9510
From Beth Tosti, Jacobs
Date January 19, 2021
Copies to CCD DOTI
On behalf of CCD Department of Transportation and Infrastructure (DOTI), we are submitting the Infill Part 1 (Mass, Form, and Context) Application for the replacement of the Red Rocks South Ramp Structures to Landmark Preservation Commission (LPC). This memorandum summarizes the activities performed in support of the structure replacements.
Project Background
The Red Rocks South Ramp Structures consists of two pedestrian bridges built in the late 1940s at Red Rocks Amphitheatre, presumably coincident with the Upper South Parking Lot construction. Location of the structures within the site is shown in Appendix A: Project Site and Naming. The structures are part of the ramp entrance on the south side of the Amphitheatre, providing critical ingress / egress to the Amphitheatre from the South Parking Lots, where over half of the patrons will park for each venue event. The South Ramp consists of two separate structures, the Upper and Lower Structures, connected by a walkway path constructed on grade within the existing rock formations, as seen in Appendix A: Project Site and Naming. The two structures are structurally independent of each other, but they are together numbered as Structure D-27-MP-240 within CCD’s asset inventory.
The structures are part of the Red Rocks Park as referenced in several historical designations. Red Rocks Park (#RR-1) was listed on the National Register of Historic Places in 1990, as a Denver Landmark in 1973, and as a National Historic Landmark in 2016. The structures were recently (2019) added as a contributing feature to the historic designation by the Landmark Preservation Commission.
In 2017, DOTI performed a structural inspection and assessment (SIA) of the existing ramp structures. The SIA identified several structural elements with low condition assessments, focusing on the bridge concrete decks. DOTI contracted Jacobs to further assess the structures with drone photography, non- destructive testing, and structural analysis. The results indicated that both structures were insufficient to support the loads applied to them in the current usage. Jacobs then worked together with DOTI to identify feasible solutions to resolve the critical life safety concerns.
The primary criterion for the replacement structures is adherence to the character defining features identified on the existing structures with reliable structures with a long design life to service users.
Character Defining Features
The character-defining features of the south ramp structures were identified based on historic and aesthetic considerations, and are listed below:
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Landmark Preservation: Infill Part 1 Application
• Curvilinear trail alignment to blend into the natural environment. • Use of a pier support on the upper structure. • Handrail design that matches original structure from the 1940s (current handrail replaced the original in 2000). • Use of natural sandstone for retaining wall façade. • Smooth concrete underside face on each structure. • Massing and proportionality of the structure elements. Photographs to visually identify these elements are presented in Appendix B: Character Defining Features.
Structural Considerations
The existing Upper Structure is considered a non-redundant and fracture critical system because the bridge is supported on only two steel girders and a single steel pier column. Non-redundant structures do not have a sufficient number of primary load-carrying members. Using the girders as an example, this means if one of the two steel girders fail, the other girder will not be capable of supporting the entire load of the structure and may result in collapse. Fracture critical members are tension steel members where sudden failure of that member would result in bridge collapse.
Throughout the assessment and preliminary alternatives analysis, DOTI has stated that they do not support maintaining a structure of this configuration, which is both non-redundant and fracture critical. The configuration does not allow adequate inspection access to assess the condition state of the steel girders or the steel pier. Keeping this structure configuration presents a significant risk to pedestrian life safety over the service life of the bridge.
The proposed structures will utilize reinforced and prestressed concrete elements to provide DOTI with a more reliable structure that can still meet the character defining features. Concrete does not carry the same inherent brittle failure properties as steel, allowing the replacement bridges to address the life safety risks that exist on the current structures.
Design Considerations
In addition to the character defining features, the structure replacements must also consider site constraints and important design considerations. These design considerations include: • Ramp alignment and profile grade; • Construction period related to venue operations; • Structure typical section.
The existing ramp profile grade is greater than 16 percent on the majority of the structures. Between these steep stretches of the ramp, there are portions with approximately 2 percent grade. Currently, American with Disabilities Act (ADA) access is provided by bus via Backstage Road, with the drop-off point at the top of the South Ramp near the Amphitheatre backstage entrance. Given the steep grade of the existing structures, the current ADA access will remain in use after structure replacement, because the structure replacements would require more than 200 feet of additional structure length to maintain a maximum of
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Landmark Preservation: Infill Part 1 Application
5 percent grade. The additional structure length would not allow the structures to remain near the same alignment as the existing structures and would dramatically alter the existing aesthetics in this area of the park.
The ramp structures are the primary ingress and egress between the Upper South Parking Lot and the Amphitheatre. Constructing the structure replacements during the concert season (approximately May through October) would greatly impact the pedestrian access to the Amphitheatre from the south side. Therefore, DOTI will schedule the majority of construction activities during the off-season (approximately November through April) to limit the impact to visitors and spectators at the venue. Construction may extend longer than this period in order to complete aesthetic finishes and site vegetation as needed. During the design process, consideration will be given toward efficiencies in the construction process to meet this expectation for the construction period.
The width of the new structure walkway will match the widest portion of the trail surrounding the existing structures. Creating a continuous walkway width will eliminate pinch points along the trail for the ingress and egress during events.
The design considerations as described are represented in Appendix C: Design Elements, with the incorporation of these elements shown in Appendix D: Structure Selection Report Summary and Appendix E: Preliminary Design Plans.
Consultation with Preservation Organizations
The design team held a pre-application meeting with City and County of Denver Landmark Preservation Commission (LPC) representatives on March 15, 2019 to introduce the project, present existing structure conditions and historic character-defining features, present proposed structure designs, obtain input, and discuss the application process. They held a second meeting with the LPC on September 9, 2019, to present the project status and further discuss the application process.
Led by Tad Bowman, Venue Director for Red Rocks Amphitheatre, the design team met with representatives of the following historic preservation agencies and organizations to present identified deficiencies of the existing structures, summarize the historic character defining features of the structures, and present the proposed design of the replacement structures, including visual simulations: • Colorado Preservation Inc. • Friends of Red Rocks • History Colorado (including the State Historic Preservation Office) • Historic Denver • National Park Service • Denver Department of Transportation and Infrastructure (DOTI)
Meetings were held on October 15, 2020, November 19, 2020, and December 3, 2020. The goal was to obtain their input on whether the proposed design for the replacement structures meets the character- defining features of the existing structures and is comparable and in keeping with the broader design and feel of the amphitheatre and park, and to answer questions.
LPC-3 3 Memorandum
Landmark Preservation: Infill Part 1 Application
Participants commented on proposed design elements (e.g., why certain design elements were dismissed, the proposed design appears larger than existing structures, colors of replacement structures should blend with existing color schemes), asked about status of Landmark Preservation Commission process, and discussed historic recordation of the existing structure prior to demolition. Comments were addressed at the meetings.
Visual simulations of the proposed replacement structure design were prepared and presented at the meetings. The simulations illustrated the size, mass, and color scheme of the proposed structures in comparison to existing conditions to help inform decision-making.
The visual simulations which incorporate the comments and feedback received from the preservation organizations are included in Appendix F: Visual Simulations.
Appendices
This memorandum includes the following appendices for the required Infill Part 1 Application information and supplementary information for the Red Rocks South Ramp Structures.
Appendix: Page:
Appendix A: Project Site and Naming APP-2
Appendix B: Character Defining Features APP-4
Appendix C: Design Elements APP-6
Appendix D: Structure Selection Report Summary APP-8
Appendix E: Preliminary Design Plans APP-15
Appendix F: Visual Simulations APP-27
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Landmark Preservation: Infill Part 1 Application
References
American Association of State Highway and Transportation Officials (AASHTO). 2009. LRFD Guide Specifications for the Design of Pedestrian Bridges.
AASHTO. 2017. LRFD Bridge Design Specifications, 8 th Edition.
Crocker and Ryan. 1946. “Bridge : Red Rocks theatre walkway.” Digital image. Denver Public Library. Website: https://digital.denverlibrary.org/digital/collection/p15330coll22/id/90918
Denver Post, The. 1949. “Red Rocks Theater.” The Denver Post, Sunday Morning, July 24, 1949.
Denver Post, The. 1954. “New Ramp and Stairs Erected.” The Denver Post. December 8, 1954 (referenced article not located)
Denver Landmark Preservation Commission Landmark Designation Application. City and County of Denver Department of Parks-Recreation. Signed 1973.
Denver Landmark Preservation Commission. 2016. Design Guidelines for Denver Landmark Structures and Districts. January 27, 2016. Denver Public Library. 2019. Western Genealogy Department, Series 3-Mountain Parks, Box 28 Folders 47 - 65. Researched February 2019. Website: https://archives.denverlibrary.org/repositories/3/archival_objects/426257
Jacobs 2019. Red Rocks South Ramp Assessment, Structural Assessment Report. 2019.
National Historic Landmark Nomination. 2013 Red Rocks Park and Mount Morrison Civilian Conservation Corps Camp. Submitted/signed June 28, 2013. Website: https://catalog.archives.gov/id/84126677
National Park Service. 2015. Heritage Documentation Programs, HABS/HAER/HALS Photography Guidelines. November 2011, updated June 2015. Website: https://www.nps.gov/hdp/standards/PhotoGuidelines.pdf
National Park Service. 2016. Red Rocks Park (Park of the Red Rocks), (Garden of the Angels), (Garden of the Titans), Written Historical and Descriptive Data, Historic American Landscapes Survey, Intermountain Regional Office, National Park Service, U.S. Department of the Interior, HALS CO- 08, 2016. Website: https://tile.loc.gov/storage- services/master/pnp/habshaer/co/co0900/co0994/data/co0994data.pdf
National Register of Historic Places Registration Form. Signed certification on March 16, 1990. Website: https://www.nps.gov/nr/feature/landscape/showcase/red_rocks_park_district.htm
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Memorandum
Landmark Preservation: Infill Part 1 Application
APPENDICES
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APP-1 Memorandum
Landmark Preservation: Infill Part 1 Application
Appendix A. Project Site and Naming
Figure A.1: Red Rocks Amphitheatre Site Map
Figure A.2: Red Rocks Amphitheatre Site Map
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APP-2 Memorandum
Landmark Preservation: Infill Part 1 Application
Figure A.3: Red Rocks South Ramp Map
Figure A.4: Red Rocks South Ramp Structure Identification
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APP-3 Memorandum
Landmark Preservation: Infill Part 1 Application
Appendix B. Character Defining Features
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APP-4 Memorandum
Landmark Preservation: Infill Part 1 Application
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APP-5 Memorandum
Landmark Preservation: Infill Part 1 Application
Appendix C. Design Considerations
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APP-6 Memorandum
Landmark Preservation: Infill Part 1 Application
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APP-7 Memorandum
Landmark Preservation: Infill Part 1 Application
Appendix D. Structure Selection Report Summary
NOTE: The Structure Selection Report Summary was finalized with DOTI in March 2020. Since that date, the coordination with the preservation organizations has led to changes for the simulations, which are incorporated into the document.
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APP-8
0
Red Rocks South Ramp
City and County of Denver
Structure Selection Report Summary
1 | 1 March 4, 2020 PWTRN201841177
Structur e Sel ecti on Report Summ ary City and C ounty of D enver
Document history and status
Revision Date Description By Review Approved
0 3/4/20 SSR for review S.Sowal B.Tosti B.Tosti
1 3/20/20 Revisions for CCD Comments S.Sowal B.Tosti B.Tosti
2 01/2021 Updated visual simulation graphics B.Tosti
Distribution of copies
Revision Issue Date issued Issued to Comments
approved
0 3/5/20 3/5/20 CCD DOTI: CL/BC For Review
1 3/31/20 CCD DOTI: CL/BC/PB For Acceptance
2 01/20201 CCD LP: BB/JC/CL/TB For Information
APP-9 Red Rocks South Ramp Structure Selection Report Summary
Red Rocks South Ramp
Project No: WVXY9510 Document Title: Structure Selection Report Summary Document No.: 1 Revision: 1 Date: March 3, 2020 Client Name: City and County of Denver Client No: PWTRN201841177 Project Manager: Beth Tosti, PE Author: Stephen Sowal, EI File Name: J:\_Transportation\WVXY9510_RedRocks South Ramp\600DISC\609STR\Report\Structure Selection Report\LPC Report Summary\LPC SSR Summary_Rev2.docx
Jacobs Engineering Group Inc.
9191 South Jamaica Street Englewood, Colorado 80112 United States T +1.303.771.0900 www.jacobs.com
© Copyright 2020 Jacobs Engineering Group Inc. The concepts and information contained in this document are the property of Jacobs. Use or copying of this document in whole or in part without the written permission of Jacobs constitutes an infringement of copyright.
Limitation: This document has been prepared on behalf of, and for the exclusive use of Jacobs’ client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this document by any third party.
APP-10 Red Rocks South Ramp Structure Selection Report Summary
The pedestrian structures that comprise the South Ramp facility were built in the late 1940s, within the Red Rocks Amphitheatre which is listed as a National Historic Landmark. A previous structure assessment performed by Jacobs evaluated the structures and found the structures to be insufficient for the loads required by current pedestrian bridge design specifications. Combined with the structure condition inspection, these capacity findings led to the City and County of Denver (CCD) taking action to mitigate life safety risk for the pedestrian users and explore alternatives for the structures. This report summary provides an overview of the alternatives considered.
Existing Structures
The South Ramp facility at Red Rocks Amphitheatre consists of two separate structures, Upper Structure and Lower Structure, connected by a walkway path constructed on grade within the existing rock formations.
Figure 1: South Ramp Facility Structure Identification
The following table provides a summary regarding the construction and the concerns found by Jacobs in the structure assessment for the existing structures.
Table 1: Existing Structure Construction and Concerns
Structure Construction Concerns
Upper Cast-in-place concrete deck Insufficient capacity and performance under specified pedestrian loads. supported on two steel girders and Non-redundant structure type: Insufficient number of primary load-carrying members. For a single column steel pier. example, if one of the two steel girders fail, the other will not be capable of supporting the entire load of the structure and may result in collapse.
Fracture critical steel members: The steel girders are subjected to tension and this can result in a sudden fracture of the steel. Failure of a fracture critical member increases the probability of structure collapse.
The exterior face of the exterior girder cannot be inspected since it is covered by a plate. Therefore, the true condition of the exterior girder is unknown.
APP-11 Red Rocks South Ramp Structure Selection Report Summary
Structure Construction Concerns
Lower Cast-in-place concrete slab on a single column cast-in-place Insufficient capacity and performance under specified pedestrian loads. concrete pier.
Due to the designation of the Amphitheatre as a National Historic Landmark, the following character defining features of the existing South Ramp facility are critical in the selection of the appropriate alternative: • Structure alignment and grade profile, and curvilinear trail alignment to blend into natural environment; • Smooth and curved exterior face of the Upper Structure to match curved features within Red Rocks Amphitheatre and the existing structures; • Use of a pier support for the Upper Structure similar to the existing structure; • Replication of the original handrail design with updates to meet current standards as necessary; • Use of natural sandstone for any retaining wall facade; • Smooth concrete underside face; and • Massing / proportionality of structure elements, including a ‘lightness’ or ‘floating effect’ of the Upper Structure.
As described above, the non-redundant nature of the existing structure is a system that presents significant life safety concerns, particularly for elements of the structure that cannot be fully inspected based on the existing configuration. The layout also lends to undesirable movements on the structure under certain loading conditions. Denver employed an Operation Plan after the Jacobs evaluation to address immediate life safety concerns, then subsequently installed shoring on the Upper Structure to further support the existing structure. Similar to the shoring system, any modifications to the existing structure to remedy the non-redundant configuration would result in significant changes to the character defining features described above, while also providing Denver with a minimal increase to the service life of the structure.
Replacement
For the replacement structures, a series of alignment and structure type alternatives were considered. Alternatives that presented significant changes to the character defining features of the historic structures or did not resolve the non- redundant nature of the existing structures were eventually eliminated from further consideration.
The proposed replacement structures maintain a similar alignment and profile to the existing structures, but they utilize all concrete members. Concrete members eliminate the concerns regarding fracture critical steel members and provide an inherently redundant structural system. Additionally, all concrete members will be easily accessible for inspection. The following concrete members are utilized in the proposed replacement alternative: • Precast concrete box girders for the Lower Structure; • Precast concrete box girders for the straight portion of the Upper Structure; • Cast-in-place concrete voided slab for the curved portion of the Upper Structure; and • Cast-in-place concrete for the Upper Structure pier.
Precast concrete members are beneficial as they can be fabricated ahead or at the same time as other construction activities. They are fabricated off-site at a precast plant, shipped to the site, and lifted into place when they are needed. This ability will be crucial for finishing construction within the available window between concert seasons to limit impacts to any events. The following table discusses the status of the character defining features in the replacement alternative.
APP-12 Red Rocks South Ramp Structure Selection Report Summary
Table 3: Replacement Character Defining Features
Character Defining Feature Discussion Alignment and profile will be slightly modified to allow for efficient placement of Alignment and Profile structure foundations. The curvilinear trail alignment will be maintained. The precast concrete box girders and cast-in-place voided slabs will provide a smooth curved exterior face for the Upper Structure. The curved face of the Lower Structure Smooth and Curved Exterior Face will be provided and incorporated into the connecting walkway path to simplify the Lower Structure. The pier will move slightly to allow for an efficient structural configuration, while Pier Support maintaining the same pier shape (hammerhead pier). A new handrail system that replicates the original 1940s handrail will be provided. The Handrail original handrail design will be updated as needed to satisfy current design standards. All retaining walls constructed as part of this project will have a natural sandstone Natural Sandstone Façade façade. The underside of the precast concrete box girders and the cast-in-place voided slab will Smooth Concrete Underside be smooth and replicate that of the existing structures. Concrete members will be sized accordingly such that the massing/proportionality will Massing/Proportionality/Lightness maintain the ‘lightness effect’ of the existing structure, including the girders and pier. See Figure 2.
Figure 2: Visual Simulation with Dimensions
APP-13 Red Rocks South Ramp Structure Selection Report Summary
Figure 3: Visual Simulation of South Ramp Facility Profile
Recommendation
The recommendation is to advance with the replacement structures to provide maximum life safety. The replacement structures allow for all character defining features of the existing structures to be incorporated with only slight modifications. Alternatively, the rehabilitation alternative will require significant changes to the appearance of the South Ramp facility, voiding certain character defining features of the original structures. Redundancy concerns previously associated with the existing Upper Structure are addressed through the inherent redundant nature of the replacement concrete structures and improves the life safety for pedestrian users. The replacement alternative is anticipated to take significantly less time to construct than the rehabilitation alternative and not impact events at the Amphitheatre, which is a critical access point to the venue.
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Landmark Preservation: Infill Part 1 Application
Appendix E. Preliminary Design Plans
Order of Plans presented:
• As-Built Plans for Lower Structure
• As-Built Plans for Upper Structure
• Preliminary Design Plans for Lower Structure, without topography displayed
• Preliminary Design Plans for Lower Structure, with topography displayed
• Preliminary Design Plans for Upper Structure, without topography displayed
• Preliminary Design Plans for Upper Structure, with topography displayed
• Preliminary Design Plans for Lower Structure, without topography displayed
• Preliminary Design Plans for both structures, full extents displayed
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APP-15 APP-16 APP-17 APP-18
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001
APP-19 ○ ○
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002
APP-20 ○ ○
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003
APP-21 004
APP-22
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005
APP-23
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006
APP-24 007
APP-25 008
APP-26 Memorandum
Landmark Preservation: Infill Part 1 Application
Appendix F. Visual Simulations
NOTE: The Infill Part 1 Application requires Isometric Drawings. The visual simulations presented hereafter intend to fulfill that requirement in a format that also visualizes the overall aesthetic of the structures within the surrounding environment.
LPC-3
APP-27 APP-28 APP-29