SR 28 Risk and Schedule Analysis.pdf

500 South Rancho Drive, Suite 7, Las Vegas, NV 89106 | (702) 272-2378

Opinion of Probable Cost and Value

Engineering Review

Tahoe East Trail - Central Corridor – Phase I (Tahoe

Transportation District)

Introduction

This report summarizes the findings of the Opinion of Probable Cost (OPCC) and Value

Engineering report for the Tahoe East Shore Trail - Central Corridor - Phase I. Included is the Risk Register and anticipated project schedule. The project consists of 1.89 miles of multiuse trail extending from the North of Sand Harbor State Park to Lodge Beach Trail where it will connects to the Central Corridor Phase II project. It includes a 10 ft wide paved surface with a min of 2 ft wide shoulders on each side of the trail. At least 9 lookout vista locations have been identified in the preliminary design. The trail alignment has been designed per ASSHTO design criteria, ABA Chapter 10 trail standards, and focused on limiting environmental impacts. A significant portion of the original design included double stacked retaining walls on the lake side of the trail and soil nail walls along the SR 28 side of the trail. Since the NVE conduits and sewer lines have been removed from the project, a significant portion of these can be eliminated and/or reduced.

The topography and vegetation varies significantly along the route. Cross slopes vary significantly, going from flat in areas in the Northern segments to select areas with cross slopes up to 1 to 1 between sta 95+00 and 121+00. In addition to the cross slopes there are a significant number of challenges with the construction of the trail including: large boulders, steep elevation gains, large areas with rock outcroppings, limited construction access, existing trail access concerns, existing utilities, and requirements to maintain traffic capacity on SR 28. The focus of this report is mitigating the challenges with the site conditions and selecting the best value construction methods and identifying any constructability challenges with the current project approach.

RSPS Scope of Service

This report is to provide initial opinion of probable construction costs (OPCC) based on a very preliminary design. The project schedule and risk register have also been provided as reference documents. Since design details have not yet been fully developed, placeholder quantities have been utilized in cooperation with the design team to help identify ideal construction methods to maximize budget and minimize risk. As the design is refined, so too will the OPCC, risk register, and supporting CPM schedule. These documents will be refined and republished throughout the design process.

Sand Harbor Segment

The Sand Harbor Segment comprises the trail section which goes through/adjacent to

Sand Harbor State Park. The major challenge associated with this segment is coordinating with the existing improvements while at the same time planning for future improvements at

Sand Harbor. The timing of the Sand Harbor improvements will greatly impact the final cost and the design approach for this segment.

Key Challenges:

• Sand Harbor Construction Timeline

• Park Access and Internal routing

• Topography adjacent to SR28

• Future Sand Harbor Entrance

• Limiting tree impacts

• Construction site access

Several alignments were considered in the 30% design workshop on Sept. 28th, 2025.

Independent of the final alignment it is recommended that the design incorporate graded slopes and/or stepped rockery walls vs MSE or Soil nail walls wherever possible. This will reduce costs significantly and blends into the existing environment to achieve a more natural appearance. The largest expense for this segment will be the undercrossing at the

Sand Harbor Park entrance as the access and grade requirements drive the design to have significant soil/rock retaining needs. A combination of rockery walls, graded slopes, and gravity walls can be utilized for the final wall design as the trail approaches the tunnel under the Park entrance. Maximizing the side slope angles by adding rip rap or other forms of slope protection is an alternative that should be considered. We recommend that the final profile minimize retaining walls as much as possible to control cost and mitigate risk due to unforeseen conditions.

North Segment

The North Segment is comprised of dense foliage with slight to moderate cross slopes.

Even though this segment appears to have the least structural requirements it does have the opportunity to be the most affordable and have the most efficient design if the team is selective in how grade deviations are addressed. The variability in the foliage and existing boulders is a major challenge that is anticipated.

• Medium to Large “Hidden” Boulders

• Heavy foliage

• Social trail access

• Limiting the downhill slope impacts

• Excavations through large rock outcroppings

Based on the existing conditions it is recommended the design incorporates graded slopes along this segment of the project. The original design shows several retaining walls, which appear to be able to be converted to graded slopes or stacked rockery walls, reducing costs by as much as 80-90%. Adjustments to the profile to reduce fill sections, such as the section at sta 64+00 thru 72+00, to reduce fill volumes can further reduce import needs on the project.

Significant cost savings can be realized if the contractor is able to harvest and process existing boulders to create rockery walls along the alignment where graded slopes would extend beyond an acceptable distance. This is compatible with the previous phase where similar retaining methods were utilized as successful slope protection. Due to the roundness of the native boulders, specifications will need to address the physical properties such as angularity so contractors have guidance on how to process any harvested boulders.

Figure 3: Left Photo - Existing slope protection on Existing trail segment. Right Photo - Large rock outcroppings incorporated into slope and trail alignment.

Central Segment

The Central Segment is the most challenging portion of the project. It is comprised of steep running slope grades and significant cross slope grades. The team is challenged with incorporating access points for maintenance crews and emergency access. While the foliage is not as heavy as other portions of the project, the number of tree impacts is significant. The team will need to ensure any alignment or grade changes mitigate as many impacts as possible.

• Steep Grades

• Cross Slopes up a 1 to 1

• Social Trail Access to Bonsai Rock

• Large Boulders and Outcroppings

• Maintenance Access from SR28

• Significant Tree Impacts

Figure 4: Left Photo – Lower Bonsai Rock Trail Right Photo – Upper Bonsai Rock Trail Access

The original 30% design incorporated a combination of soil nail and double stacked retaining/MSE walls on a majority of the trail South of sta 90+50. Based on RSPS’s analysis the cost of these systems become more expensive as the lower retaining wall heights require MSE walls construction and when substantial soil-nail walls are required.

As the native rock face slope increases over a 2 to 1 cross slope the advantage of alternative methods such as segmental steel bridges or concrete viaducts become more viable and preferred when cross slopes approach a 1 to 1. Previous discussions with the team indicated that max gravity wall heights are between 6 and 10 ft. Structural limitations of gravity walls versus MSE walls will be a major determination of the OPCC. Due to the excavation requirements it is anticipated that the cost will greatly increase where large volumes of soil and/or rock removal are required. Final cost determination is dependent on strap length requirements, excavation limits, and fill placement procedures.

The specifics or the limits of an elevated trail system still need to be evaluated, but RSPS recommends that between sta 95+00 and sta 124+00 a concrete viaduct or segmental bridge system can be incorporated into the design. RSPS performed a cost comparison between concrete viaducts with micro-pile foundations, large steel bridge structures, and segmental steel bridges with micro-pile foundations. Based on research the cost for those segments are anticipated to be in the range of $3,900/linft for a concrete viaduct, $10,000/linft for large bridge structures, and $6,700 /linft for segmental steel bridges. The foundation systems between the viaduct method and segmental bridge approach are similar and may offer an opportunity to have these as alternatives in the bidding and contracting process. If a CMAR contracting approach is selected this can be vetted out in negotiations.

A full cost analysis between a segmental steel bridge and a concrete viaduct indicates that a precast concrete system can be constructed for around 58% of the cost of a steel segmental system. The viaduct maintains the design continuity to the demonstration project, since their profiles are similar to a segmental bridge system. The design may require closer support spacing, however that allows for lighter segments for the construction team and crane needs. This reduces the operational and equipment needs for construction. Both systems require a portion of the elements to be manufactured offsite, however there is more onsite construction with a concrete viaduct. Steel pricing was identified as a considerable risk factor due to material pricing fluctuations. An added benefit to concrete is that their surfaces tend to be more durable than steel surfaces in the long run and require less maintenance.

Figure 5: Left Photo – Peaks to Plains Viaduct Photo Credit (www.jeffco.us/3792/Peaks-to-Plains-Trail). Right photo - Lake

Tahoe East Trail Photo Credit (CreativeConceptsGroup.com)

South (Lodge Beach Trail) Segment

There is a significant opportunity to realize cost savings on the Southern segment when compared to the original design, which included a significant portion of the retaining walls as double stacked MSE walls on the lake side and soil nail walls on the SR28 side of the trail. Both options have significant costs associated with their use. This portion of the project includes significant elevation gains with moderate to slight cross slopes.

• Steep elevation gains

• Moderate cross slopes

• Deep fill sections

• Connection to future phase II

• Maintenance of Lodge Beach Trail

Figure 6: Left Photo - Southern Section Adjacent to SR28. Right Photo: Northern Segment – Granite slab sections and steep cross slopes.

If the alignment of the trail can be adjusted where the heel of the existing road embankment abuts the edge of the trail a significant amount of upper retaining walls can be eliminated on the SR 28 side. A review of the current profile seems to indicate that soil nail walls from sta 121+00 thru 140+00 can be greatly reduced and in some instances removed completely (Sta 133+65 through 140+00).

The existing topography appears to allow for a combination of graded slopes and retaining wall construction similar to what is recommended for the Northern segment. Large rock outcroppings and granite sections will make any excavation significantly more expensive at the Northern portion of this segment. If the design can limit the use of MSE wall sections, Appendix D – Project Schedule

Activity ID Activity Name OD RD Start Finish

SR28 East Shore - ATKINS/ LUMOS 30% CPM DeliverableSR28 East Shore - ATKINS/ LUMOS 30% CPM Deliverable 949 777 13-Feb-25 A 13-Oct-28

MilestonesMilestones 878 776 23-May-25 A 13-Oct-28

SR28-50 NTP (Contract 30% Design Effort May 23, 2025) 0 0 23-May-25 A

SR28-70 Phase 1 Design 30% Milestone Complete (October 15, 2025) 0 0 15-Oct-25*

SR28-75 Awaiting Phase 2 NTP (DES60,100%) (Board Mtg 1st Wed / Month) 0 0 20-Oct-25

SR28-110 Phase 2 Design 60% Milestone Complete (Apr 10, 2026) 0 0 10-Apr-26*

SR28-120 Phase 3 Design 100% Milestone Complete (Aug 28, 2026) 0 0 28-Aug-26*

SR28-130 Construction NTP Season 1 (May 3, 2027) 0 0 03-May-27*

SR28-150 Construction Substantial Completion Season 1 (Oct 15, 2027) 0 0 15-Oct-27

SR28-140 Construction NTP Season 2 (May 1, 2028) 0 0 01-May-28*

SR28-160 Construction Substantial Completion Season 2 (Oct 13, 2028) 0 0 13-Oct-28

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

13-Oct-28, SR28 East Shore - ATKINS/ LUMOS 30% CPM Deliverable

13-Oct-28, Milestones

NTP (Contract 30% Design Effort May 23, 2025)

Phase 1 Design 30% Milestone Complete (October 15, 2025)

Awaiting Phase 2 NTP (DES60,100%) (Board Mtg 1st Wed / Month)

Phase 2 Design 60% Milestone Complete (Apr 10, 2026)

Phase 3 Design 100% Milestone Complete (Aug 28, 2026)

Construction NTP Season 1 (May 3, 2027)

Construction Substantial Completion Season 1 (Oct 15, 2027)

Construction NTP Season 2 (May 1, 2028)

Construction Substantial Completion Season 2 (Oct 13, 2028)

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 1 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

SR28 East Shore - ATKINS/ LUMOS 30% CPM Deliverable SR-28_1025 Atkins TTD - All Work Layout

Project ManagementProject Management 463 269 13-Feb-25 A 30-Oct-26

SR28-19 Stakeholder Agency Team Meetings 5 0 13-Feb-25 A 19-Feb-25 A

SR28-20 Miscellaneous Coordination Meetings (Thru Full Design) 181 205 13-Feb-25 A 31-Jul-26

SR28-21 PEP/QAP 58 0 23-May-25 A 14-Aug-25 A

SR28-6 Project Management Coordination (Monthly PMT) 384 269 05-Jun-25 A 30-Oct-26

SR28-8 Internal Team Meetings (Thru Full Design) 272 205 14-Jul-25 A 31-Jul-26

Project Kickoff MeetingsProject Kickoff Meetings 14 0 29-May-25 A 18-Jun-25 A

SR28-73 PM Kickoff with TTD 0 0 29-May-25 A

SR28-74 Sand Harbor Kickoff - Master Plan 0 0 18-Jun-25 A

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

30-Oct-26, Project Management

Stakeholder Agency Team Meetings

Miscellaneous Coordination Meetings (Thru Full Design)

PEP/QAP

Project Management Coordination (Monthly PMT)

Internal Team Meetings (Thru Full Design)

18-Jun-25 A, Project Kickoff Meetings

PM Kickoff with TTD

Sand Harbor Kickoff - Master Plan

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 2 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

Public OutreachPublic Outreach 155 0 24-Sep-25 A 04-May-26

SR28-100 Stakeholder Workshop (Sept 24, 2025) 1 0 24-Sep-25 A 24-Sep-25 A

SR28-62 Public Workshop with Central Corridor - SR 28 Open House (TBD April 2026) 0 0 04-May-26

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

04-May-26, Public Outreach

Stakeholder Workshop (Sept 24, 2025)

Public Workshop with Central Corridor - SR 28 Open House (TBD April 2026)

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 3 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

Phase 1 - 30% Design and Env. AnalysisPhase 1 - 30% Design and Env. Analysis 519 418 23-May-25 A 31-May-27

SR28-14 Field Survey 75 0 12-Jun-25 A 13-Oct-25 A

SR28-12 Existing and Historical As Built Data Collection for 30% Design Review 60 0 26-Jun-25 A 18-Sep-25 A

SR28-22 Subsurface Utilities - As Built Documentation 80 52 05-Sep-25 A 29-Dec-25

Geotechnical InvestigationGeotechnical Investigation 121 20 23-May-25 A 11-Nov-25

SR28--57 Awaiting Temp Forest Service and State Lands Temp Authorization to start Geotec Services 70 0 23-May-25 A 01-Sep-25 A

SR28-59 Prep 15 0 02-Sep-25 A 30-Sep-25 A

SR28-60 Field Work - Borings and Geophysical Testing 15 0 02-Sep-25 A 30-Sep-25 A

SR28-77 Prepare for Structural Design Discussions 10 0 24-Sep-25 A 07-Oct-25 A

SR28-61 Report (Target Nov 11, 2025) 30 20 01-Oct-25 A 11-Nov-25

30% Design Workshop30% Design Workshop 84 1 19-Jun-25 A 15-Oct-25

SR28-66 Review CAD and Develop Alt Ideas 29 0 19-Jun-25 A 30-Jul-25 A

SR28-67 Review Alt Ideas with TTD 5 0 31-Jul-25 A 06-Aug-25 A

SR28-24 VE, Feasibility, ICE/OPCC, Master Schedule and Risk Register 30 0 07-Aug-25 A 17-Sep-25 A

SR28-68 Refine Alt Ideas for Workshop (Sep 17, 2025) 20 0 21-Aug-25 A 17-Sep-25 A

SR28-53 Prep and Workshop (Sep 24, 2025) 5 0 18-Sep-25 A 24-Sep-25 A

SR28-54 Summary Document from Stakeholder Feedback - Completion Scope 15 1 25-Sep-25 A 15-Oct-25

Environmental Analysis and DocumentationEnvironmental Analysis and Documentation 293 293 13-Apr-26 31-May-27

SR28-82 Biological Resources Technical Report 80 80 13-Apr-26 31-Jul-26

SR28-85 NDOT Occupancy Permit 60 60 13-Apr-26 03-Jul-26

SR28-87 NDSL Auth. For Perm Use of State Lands Application (ROE) 60 60 13-Apr-26 03-Jul-26

SR28-93 Cultural Resources Analysis (Section 106 Report) 110 110 13-Apr-26 14-Sep-26

SR28-97 USFS Use of Forest Permit (SUP) *Expedited* 25 25 13-Apr-26 15-May-26

SR28-83 Programatic Section 4(f) Report 110 110 10-Aug-26 13-Jan-27

SR28-88 Washoe County Grading Permit Application 60 60 31-Aug-26 23-Nov-26

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

31-May-27, Phase 1 - 30% Design and Env. Analysis

Field Survey

Existing and Historical As Built Data Collection for 30% Design Review

Subsurface Utilities - As Built Documentation

11-Nov-25, Geotechnical Investigation

Awaiting Temp Forest Service and State Lands Temp Authorization to start Geotec Services

Prep

Field Work - Borings and Geophysical Testing

Prepare for Structural Design Discussions

Report (Target Nov 11, 2025)

15-Oct-25, 30% Design Workshop

Review CAD and Develop Alt Ideas

Review Alt Ideas with TTD

VE, Feasibility, ICE/OPCC, Master Schedule and Risk Register

Refine Alt Ideas for Workshop (Sep 17, 2025)

Prep and Workshop (Sep 24, 2025)

Summary Document from Stakeholder Feedback - Completion Scope

31-May-27, Environmental Analysis and Documentation

Biological Resources Technical Report

NDOT Occupancy Permit

NDSL Auth. For Perm Use of State Lands Application (ROE)

Cultural Resources Analysis (Section 106 Report)

USFS Use of Forest Permit (SUP) *Expedited*

Programatic Section 4(f) Report

Washoe County Grading Permit Application

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 4 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

SR28-89 N. NV Public Health Dust Control Permit Application 60 60 31-Aug-26 23-Nov-26

SR28-84 TRPA EIP Project Review Application Package 120 120 15-Sep-26 03-Mar-27

SR28-81 NEPA CE (Target May 3, 2027) 120 120 14-Dec-26 31-May-27

SR28-86 SWPPP (NDEP Stormwater General Permit) by GC 30 30 26-Jan-27 08-Mar-27

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

N. NV Public Health Dust Control Permit Application

TRPA EIP Project Review Application Package

NEPA CE (Target May 3, 2027)

SWPPP (NDEP Stormwater General Permit) by GC

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 5 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

Phase 2 - 60% DesignPhase 2 - 60% Design 132 132 20-Oct-25 24-Apr-26

SR28-16 VE, Deterministic Schedule, Risk Register 62 62 20-Oct-25 16-Jan-26

SR28-17 60% Drainage Design and Analysis 62 62 20-Oct-25 16-Jan-26

SR28-55 60% Trail Design 62 62 20-Oct-25 16-Jan-26

SR28-15 Specifications 8 8 19-Jan-26 28-Jan-26

SR28-27 60% Structural Design 40 40 19-Jan-26 13-Mar-26

SR28-28 60% Design L&A 30 30 19-Jan-26 27-Feb-26

SR28-29 60% Design Singing and Wayfinding 30 30 19-Jan-26 27-Feb-26

SR28-30 60% Electrical Design 30 30 19-Jan-26 27-Feb-26

SR28-31 60% Design ROW, Easements, ROE 15 15 19-Jan-26 06-Feb-26

SR28-32 Construction Sequencing, Phasing, and Scheduling 7 7 19-Jan-26 27-Jan-26

SR28-33 QC 15 15 09-Feb-26 27-Feb-26

SR28-18 60% Submittal and TTD, NDOT, NVE, USFS, NDSP, NDSL Comment Resolution 30 30 02-Mar-26 10-Apr-26

SR28-56 ICE OPCC Cost Estimate 10 10 13-Apr-26 24-Apr-26

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

24-Apr-26, Phase 2 - 60% Design

VE, Deterministic Schedule, Risk Register

60% Drainage Design and Analysis

60% Trail Design

Specifications

60% Structural Design

60% Design L&A

60% Design Singing and Wayfinding

60% Electrical Design

60% Design ROW, Easements, ROE

Construction Sequencing, Phasing, and Scheduling

QC

60% Submittal and TTD, NDOT, NVE, USFS, NDSP, NDSL Comment Resolution

ICE OPCC Cost Estimate

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 6 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

Phase 3 - Final DesignPhase 3 - Final Design 169 169 13-Apr-26 07-Dec-26

Design Plans and Cost EstimateDesign Plans and Cost Estimate 169 169 13-Apr-26 07-Dec-26

SR28-35 Final Structural Design 50 50 13-Apr-26 19-Jun-26

SR28-36 Final Design L&A 50 50 13-Apr-26 19-Jun-26

SR28-37 Final Design Singing and Wayfinding 50 50 13-Apr-26 19-Jun-26

SR28-38 Final Electrical Design 50 50 13-Apr-26 19-Jun-26

SR28-40 Construction Sequencing, Phasing, and Scheduling 50 50 13-Apr-26 19-Jun-26

SR28-42 VE, Deterministic Schedule, Risk Register 50 50 13-Apr-26 19-Jun-26

SR28-43 Final Drainage Design and Analysis 50 50 13-Apr-26 19-Jun-26

SR28-57 Final Trail Design 50 50 13-Apr-26 19-Jun-26

SR28-39 Final Design ROW, Easements, ROE 15 15 22-Jun-26 10-Jul-26

SR28-41 Specifications 15 15 22-Jun-26 10-Jul-26

SR28-44 QC 15 15 13-Jul-26 31-Jul-26

SR28-45 Final Submittal 100% and Comment Resolution 20 20 03-Aug-26 28-Aug-26

SR28-46 NDOT Encroachment Permit 39 39 31-Aug-26 23-Oct-26

SR28-58 ICE OPCC Cost Estimate 15 15 31-Aug-26 21-Sep-26

SR28-47 Bid / Advertisement / Award (Assume Design/Bid/Build Contract) 30 30 26-Oct-26 07-Dec-26

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

07-Dec-26, Phase 3 - Final Design

07-Dec-26, Design Plans and Cost Estimate

Final Structural Design

Final Design L&A

Final Design Singing and Wayfinding

Final Electrical Design

Construction Sequencing, Phasing, and Scheduling

VE, Deterministic Schedule, Risk Register

Final Drainage Design and Analysis

Final Trail Design

Final Design ROW, Easements, ROE

Specifications

QC

Final Submittal 100% and Comment Resolution

NDOT Encroachment Permit

ICE OPCC Cost Estimate

Bid / Advertisement / Award (Assume Design/Bid/Build Contract)

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 7 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

GMP Buyout (IF CMAR APPROACH)GMP Buyout (IF CMAR APPROACH) 254 254 16-Oct-25 12-Oct-26

CMAR ApproachCMAR Approach 254 254 16-Oct-25 12-Oct-26

GMPGMP 254 254 16-Oct-25 12-Oct-26

CMAR-20 Proposed 30% Design Milestone 1 1 16-Oct-25 16-Oct-25

CMAR-60 Assumed 60% Design Milestone 1 1 13-Apr-26 13-Apr-26

CMAR-190 Assumed 100% Design Milestone 1 1 31-Aug-26 31-Aug-26

GMP 60% PricingGMP 60% Pricing 3 3 14-Apr-26 16-Apr-26

CMAR-10 CMAR GMP1 Prepare & Submit (Typically 60% and 90% Design) 1 1 14-Apr-26 14-Apr-26

CMAR-30 GMP1 Workshop 1 1 15-Apr-26 15-Apr-26

CMAR-40 Review & Approve GMP1 by TMWA, COR & CMAR 1 1 15-Apr-26 15-Apr-26

CMAR-50 TMWA Board Approval GMP1 1 1 16-Apr-26 16-Apr-26

GMP 90% - Final GMPGMP 90% - Final GMP 21 21 14-Sep-26 12-Oct-26

CMAR-130 CMAR GMP Prepare & Submit (100% Design) 10 10 14-Sep-26 25-Sep-26

CMAR-150 GMP Workshop (#5) 1 1 28-Sep-26 28-Sep-26

CMAR-160 Review & Approve GMP by TTD and CMAR 10 10 28-Sep-26 09-Oct-26

CMAR-170 TMWA Board Approval GMP 1 1 12-Oct-26 12-Oct-26

CMAR-180 City Council Approval GMP TBD 1 1 12-Oct-26 12-Oct-26

Prequalification Sub Contractors GMPPrequalification Sub Contractors GMP 119 119 14-Apr-26 25-Sep-26

CMAR-70 Advertise for Prequalification of Subcontractors 30 30 14-Apr-26 25-May-26

CMAR-80 Accept Prequalification Applications from Subcontractors 30 30 14-Apr-26 25-May-26

CMAR-90 Evaluate & Prequalify Subcontractors 14 14 26-May-26 12-Jun-26

CMAR-100 Public Advertisement for Bid Process 30 30 15-Jun-26 24-Jul-26

CMAR-110 Assemble & Prepare Bid Packages (100% Corrected Issue) 14 14 27-Jul-26 13-Aug-26

CMAR-120 Conduct Bid Process with 100% Corrected Design 40 40 27-Jul-26 18-Sep-26

CMAR-140 Evaluate Bids & Select Subcontractors/Suppliers 5 5 21-Sep-26 25-Sep-26

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

12-Oct-26, GMP Buyout (IF CMAR APPROACH)

12-Oct-26, CMAR Approach

12-Oct-26, GMP

Proposed 30% Design Milestone

Assumed 60% Design Milestone

Assumed 100% Design Milestone

16-Apr-26, GMP 60% Pricing

CMAR GMP1 Prepare & Submit (Typically 60% and 90% Design)

GMP1 Workshop

Review & Approve GMP1 by TMWA, COR & CMAR

TMWA Board Approval GMP1

12-Oct-26, GMP 90% - Final GMP

CMAR GMP Prepare & Submit (100% Design)

GMP Workshop (#5)

Review & Approve GMP by TTD and CMAR

TMWA Board Approval GMP

City Council Approval GMP TBD

25-Sep-26, Prequalification Sub Contractors GMP

Advertise for Prequalification of Subcontractors

Accept Prequalification Applications from Subcontractors

Evaluate & Prequalify Subcontractors

Public Advertisement for Bid Process

Assemble & Prepare Bid Packages (100% Corrected Issue)

Conduct Bid Process with 100% Corrected Design

Evaluate Bids & Select Subcontractors/Suppliers

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 8 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

ConstructionConstruction 419 419 09-Mar-27 13-Oct-28

SEASON 1 (South to North to avoid boating/traffic season)SEASON 1 (South to North to avoid boating/traffic season) 159 159 09-Mar-27 15-Oct-27

Pre ConstructionPre Construction 95 95 09-Mar-27 19-Jul-27

CON S1 PreC Pre-Construction Start (Intent for early material release to support May 3, 2027 field start) 0 0 09-Mar-27

Long Lead MaterialsLong Lead Materials 95 95 09-Mar-27 19-Jul-27

Submittals (Asssume 3 weeks GC; 3 weeks AE approval; 3 weeks NDOT0)Submittals (Asssume 3 weeks GC; 3 weeks AE approval; 3 weeks NDOT0) 45 45 09-Mar-27 10-May-27

CON S1 Sub10 Ready Rock Submittal and Approval 45 45 09-Mar-27 10-May-27

CON S1 Sub20 Pre Cast Box @ Tunnel Submittal and Approval 45 45 09-Mar-27 10-May-27

CON S1 Sub30 Soil Nail Submittal and AE Approval 45 45 09-Mar-27 10-May-27

CON S1 Sub35 Pre Cast Pipe Storm Drain Submittal and Approval 45 45 09-Mar-27 10-May-27

Fab to SiteFab to Site 50 50 11-May-27 19-Jul-27

CON S1 Fab10 Ready Rock and/or MSE Long Lead to Site (assume 10 weeks) 50 50 11-May-27 19-Jul-27

CON S1 Fab20 Pre Cast Box @ Tunnel Long Lead to Site (assume 6-10 weeks) 40 40 11-May-27 05-Jul-27

CON S1 Fab30 Soil Nail Long Lead Cables and Bars to Site (assume 6-10 weeks) 40 40 11-May-27 05-Jul-27

CON S1 Fab35 Storm Drain Long Lead to Site (18"/24"/36") (assume 4 weeks) 20 20 11-May-27 07-Jun-27

Deferred ApprovalsDeferred Approvals 20 20 11-May-27 07-Jun-27

Con S1 DEF1 Soil Nail DEFERRED Approval 20 20 11-May-27 07-Jun-27

ConstructionConstruction 120 120 03-May-27 15-Oct-27

CON S1 NTP Season 1 - NTP Target Start May 3, 2027 (thru Oct 15, 2027 Summary Duration) 0 0 03-May-27*

CON S1 Mob Mobilization 5 5 03-May-27 07-May-27

CON S1 TC1 Traffic Control 4 4 03-May-27 06-May-27

CON S1 PL Punchlist/ NCR Season 1 *Seg 3 high risk install duration for Season 1* 15 15 27-Sep-27 15-Oct-27

CON S1 TC2 Remove Traffic Control 3 3 06-Oct-27 08-Oct-27

CON S1 SC Season 1 - Substantial Completion Target Oct 15, 2027 0 0 15-Oct-27*

Segment 1 - Sand Harbor (40+00 to 69+00)Segment 1 - Sand Harbor (40+00 to 69+00) 99 99 07-May-27 22-Sep-27

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

13-Oct-28, Construction

15-Oct-27, SEASON 1 (South to North to avoid boating/traffic season)

19-Jul-27, Pre Construction

Pre-Construction Start (Intent for early material release to support May 3, 2027 field start)

19-Jul-27, Long Lead Materials

10-May-27, Submittals (Asssume 3 weeks GC; 3 weeks AE approval; 3 weeks NDOT0)

Ready Rock Submittal and Approval

Pre Cast Box @ Tunnel Submittal and Approval

Soil Nail Submittal and AE Approval

Pre Cast Pipe Storm Drain Submittal and Approval

19-Jul-27, Fab to Site

Ready Rock and/or MSE Long Lead to Site (assume 10 weeks)

Pre Cast Box @ Tunnel Long Lead to Site (assume 6-10 weeks)

Soil Nail Long Lead Cables and Bars to Site (assume 6-10 weeks)

Storm Drain Long Lead to Site (18"/24"/36") (assume 4 weeks)

07-Jun-27, Deferred Approvals

Soil Nail DEFERRED Approval

15-Oct-27, Construction

Season 1 - NTP Target Start May 3, 2027 (thru Oct 15, 2027 Summary Duration)

Mobilization

Traffic Control

Punchlist/ NCR Season 1 *Seg 3 high risk install duration for Season 1*

Remove Traffic Control

Season 1 - Substantial Completion Target Oct 15, 2027

22-Sep-27, Segment 1 - Sand Harbor (40+00 to 69+00)

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 9 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

CON S1 CG Clear and Grub 20 20 07-May-27 03-Jun-27

CON S1 TR Harvest Boulders and Trees 20 20 14-May-27 10-Jun-27

CON S1 STRM Storm Drain crossing install 15 15 04-Jun-27 24-Jun-27

CON S1 Seg1 1 Structural Excavate soil top-down 15 15 11-Jun-27 01-Jul-27

CON S1 Seg1 2 Drill horizontal holes at face 15 15 18-Jun-27 08-Jul-27

CON S1 Seg1 3 Insert tension-resisting steel bars @ drilled holes 25 25 06-Jul-27 09-Aug-27

CON S1 Seg1 4 Grout @ holes from the bottom up 15 15 27-Jul-27 16-Aug-27

CON S1 Seg1 5 Drainage system install @ exposed face 25 25 27-Jul-27 30-Aug-27

CON S1 Seg1 6 Gravity Wall / Ready Rock Install (assumed multiple crews) 22 22 17-Aug-27 15-Sep-27

CON S1 Seg1 7 Rough Grade (Ready for Season 2) 5 5 16-Sep-27 22-Sep-27

Segment 2 - North Segment (69+00 to 90+00)Segment 2 - North Segment (69+00 to 90+00) 60 60 02-Jul-27 23-Sep-27

CON S1 Seg2 1 Structural Excavate soil top-down and Fill (need fill from Seg 1 to complete) 15 15 02-Jul-27 22-Jul-27

CON S1 Seg2 2 MSE Wall Install 25 25 23-Jul-27 26-Aug-27

CON S1 Seg2 3 Gravity Wall Install (assumed multiple crews) 25 25 13-Aug-27 16-Sep-27

CON S1 Seg2 4 Rough Grade (Ready for Season 2) 5 5 17-Sep-27 23-Sep-27

Segment 3 - Central Segment (90+00 to 124+00) *TBD Viaduct install*Segment 3 - Central Segment (90+00 to 124+00) *TBD Viaduct install* 115 115 07-May-27 14-Oct-27

CON S1 Seg3 1 Clear and Grub (assumed dedicated crew) 25 25 07-May-27 10-Jun-27

CON S1 Seg3 2 Harvest Boulders and Trees 25 25 14-May-27 17-Jun-27

CON S1 Seg3 3 Structural Excavate soil top-down 80 80 25-May-27 13-Sep-27

CON S1 Seg3 4 Ready Rock (MSE) Wall Install (assumed dedicated crew) 80 80 01-Jun-27 20-Sep-27

CON S1 Seg3 5 Soil Nail / Wall Stabilization System Install 80 80 22-Jun-27 11-Oct-27

CON S1 Seg3 6 Rough Grade (Ready for Season 2) *POTENTIALLY LATE FOR SEASON 1* 15 15 24-Sep-27 14-Oct-27

Segment 4 - South Segment (124+00 to 139+60)Segment 4 - South Segment (124+00 to 139+60) 98 98 28-May-27 12-Oct-27

CON S1 Seg4 1 Structural Excavate soil top-down (crew tie Seg 2) 50 50 28-May-27 05-Aug-27

CON S1 Seg4 2 MSE Wall Install (crew tie Seg 2) 40 40 30-Jul-27 23-Sep-27

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

Clear and Grub

Harvest Boulders and Trees

Storm Drain crossing install

Structural Excavate soil top-down

Drill horizontal holes at face

Insert tension-resisting steel bars @ drilled holes

Grout @ holes from the bottom up

Drainage system install @ exposed face

Gravity Wall / Ready Rock Install (assumed multiple crews)

Rough Grade (Ready for Season 2)

23-Sep-27, Segment 2 - North Segment (69+00 to 90+00)

Structural Excavate soil top-down and Fill (need fill from Seg 1 to complete)

MSE Wall Install

Gravity Wall Install (assumed multiple crews)

Rough Grade (Ready for Season 2)

14-Oct-27, Segment 3 - Central Segment (90+00 to 124+00) *TBD Viaduct install*

Clear and Grub (assumed dedicated crew)

Harvest Boulders and Trees

Structural Excavate soil top-down

Ready Rock (MSE) Wall Install (assumed dedicated crew)

Soil Nail / Wall Stabilization System Install

Rough Grade (Ready for Season 2) *POTENTIALLY LATE FOR SEASON 1*

12-Oct-27, Segment 4 - South Segment (124+00 to 139+60)

Structural Excavate soil top-down (crew tie Seg 2)

MSE Wall Install (crew tie Seg 2)

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 10 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

CON S1 Seg4 3 Lower Gravity Wall Install (crew tie Seg 2) 40 40 30-Jul-27 23-Sep-27

CON S1 Seg4 4 Upper Gravity Wall Install (crew tie Seg 2) 40 40 13-Aug-27 07-Oct-27

CON S1 Seg4 5 Rough Grade (Ready for Season 2) 5 5 06-Oct-27 12-Oct-27

Crossing @ Boat LaunchCrossing @ Boat Launch 53 53 06-Jul-27 16-Sep-27

Con S1 Xing10 Install RCB install for trail passage (trail to follow) 20 20 06-Jul-27 02-Aug-27

Con S1 Xing Placeholder trail under road vs @ grade (TBD by Sand Harbor Improvement Schedule) 30 30 06-Aug-27 16-Sep-27

SEASON 2 (South to North to avoid boating/traffic season)SEASON 2 (South to North to avoid boating/traffic season) 160 160 06-Mar-28 13-Oct-28

Pre ConstructionPre Construction 50 50 06-Mar-28 12-May-28

CON S2 PreC Pre-Construction Start (Intent for early material release to support May 1, 2028 field start) 0 0 06-Mar-28*

Long Lead MaterialsLong Lead Materials 50 50 06-Mar-28 12-May-28

CON S2 Sub10 Signage 50 50 06-Mar-28 12-May-28

CON S2 Sub20 Handrail 40 40 06-Mar-28 28-Apr-28

ConstructionConstruction 120 120 01-May-28 13-Oct-28

CON S2 NTP Season 2- NTP Target Start May 1, 2028 (thru Oct 13, 2028 Summary Duration) 0 0 01-May-28*

CON S2 Mob Mobilization 5 5 01-May-28 05-May-28

CON S2 TC1 Traffic Control 4 4 01-May-28 04-May-28

CON S2 PL Punchlist/ NCR Season 2 20 20 18-Sep-28 13-Oct-28

CON S2 SC Season 2 - Substantial Completion Target Oct 13, 2028 0 0 13-Oct-28*

Segment 1 - Sand Harbor (40+00 to 69+00)Segment 1 - Sand Harbor (40+00 to 69+00) 107 107 05-May-28 02-Oct-28

CON S2 Seg1 1 Rough Grade Prep and Clean up 15 15 05-May-28 25-May-28

CON S2 Seg1 2 Place reinforced facing material 20 20 26-May-28 22-Jun-28

CON S2 Seg1 3 Steel Bearing plates and tighten 20 20 09-Jun-28 06-Jul-28

CON S2 Seg1 4 Finish Facing 20 20 23-Jun-28 20-Jul-28

CON S2 Seg1 5 Type II base for paving 15 15 21-Jul-28 10-Aug-28

CON S2 Seg1 6 AC Paving 12 12 04-Aug-28 21-Aug-28

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

Lower Gravity Wall Install (crew tie Seg 2)

Upper Gravity Wall Install (crew tie Seg 2)

Rough Grade (Ready for Season 2)

16-Sep-27, Crossing @ Boat Launch

Install RCB install for trail passage (trail to follow)

Placeholder trail under road vs @ grade (TBD by Sand Harbor Improvement Schedule)

13-Oct-28, SEASON 2 (South to North to avoid boating/traffic season)

12-May-28, Pre Construction

Pre-Construction Start (Intent for early material release to support May 1, 2028 field start)

12-May-28, Long Lead Materials

Signage

Handrail

13-Oct-28, Construction

Season 2- NTP Target Start May 1, 2028 (thru Oct 13, 2028 Summary Duration)

Mobilization

Traffic Control

Punchlist/ NCR Season 2

Season 2 - Substantial Completion Target Oct 13, 2028

02-Oct-28, Segment 1 - Sand Harbor (40+00 to 69+00)

Rough Grade Prep and Clean up

Place reinforced facing material

Steel Bearing plates and tighten

Finish Facing

Type II base for paving

AC Paving

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 11 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

CON S2 Seg1 7 Final edge grading 20 20 22-Aug-28 18-Sep-28

CON S2 Seg1 8 Landscape, Signage and Striping 15 15 22-Aug-28 11-Sep-28

CON S2 Seg1 9 Pedestrian Railing 20 20 05-Sep-28 02-Oct-28

Segment 2 - North Segment (69+00 to 90+00)Segment 2 - North Segment (69+00 to 90+00) 75 75 05-May-28 17-Aug-28

CON S2 Seg2 1 Rough Grade Prep and Clean up 15 15 05-May-28 25-May-28

CON S2 Seg2 2 Type II base for paving 15 15 19-May-28 08-Jun-28

CON S2 Seg2 3 Vista Build 25 25 26-May-28 29-Jun-28

CON S2 Seg2 4 AC Paving Trail and Vista 12 12 21-Jun-28 06-Jul-28

CON S2 Seg2 5 Final edge grading 20 20 07-Jul-28 03-Aug-28

CON S2 Seg2 6 Landscape, Signage and Striping 15 15 07-Jul-28 27-Jul-28

CON S2 Seg2 7 Pedestrian Railing 20 20 21-Jul-28 17-Aug-28

Segment 3 - Central Segment (90+00 to 124+00) *TBD Viaduct install*Segment 3 - Central Segment (90+00 to 124+00) *TBD Viaduct install* 115 115 05-May-28 12-Oct-28

CON S2 Seg3 1 Rough Grade Prep and Clean up 20 20 05-May-28 01-Jun-28

CON S2 Seg3 2 Place reinforced facing material 25 25 19-May-28 22-Jun-28

CON S2 Seg3 3 Steel Bearing plates and tighten 25 25 02-Jun-28 06-Jul-28

CON S2 Seg3 4 Vista Build 25 25 02-Jun-28 06-Jul-28

CON S2 Seg3 5 Finish Facing 25 25 16-Jun-28 20-Jul-28

CON S2 Seg3 6 Type II base for paving 20 20 14-Jul-28 10-Aug-28

CON S2 Seg3 7 AC Paving Trail and Vista 15 15 04-Aug-28 24-Aug-28

CON S2 Seg3 8 Final edge grading 25 25 25-Aug-28 28-Sep-28

CON S2 Seg3 9 Landscape, Signage and Striping 20 20 25-Aug-28 21-Sep-28

CON S2 Seg3 10 Pedestrian Railing 25 25 08-Sep-28 12-Oct-28

Segment 4 - South Segment (124+00 to 139+60)Segment 4 - South Segment (124+00 to 139+60) 75 75 26-May-28 07-Sep-28

CON S2 Seg4 1 Rough Grade Prep and Clean up (crew tie from Seg 2) 15 15 26-May-28 15-Jun-28

CON S2 Seg4 2 Type II base for paving 15 15 09-Jun-28 29-Jun-28

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

Final edge grading

Landscape, Signage and Striping

Pedestrian Railing

17-Aug-28, Segment 2 - North Segment (69+00 to 90+00)

Rough Grade Prep and Clean up

Type II base for paving

Vista Build

AC Paving Trail and Vista

Final edge grading

Landscape, Signage and Striping

Pedestrian Railing

12-Oct-28, Segment 3 - Central Segment (90+00 to 124+00) *TBD Viaduct install*

Rough Grade Prep and Clean up

Place reinforced facing material

Steel Bearing plates and tighten

Vista Build

Finish Facing

Type II base for paving

AC Paving Trail and Vista

Final edge grading

Landscape, Signage and Striping

Pedestrian Railing

07-Sep-28, Segment 4 - South Segment (124+00 to 139+60)

Rough Grade Prep and Clean up (crew tie from Seg 2)

Type II base for paving

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 12 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

CON S2 Seg4 3 Vista Build 25 25 16-Jun-28 20-Jul-28

CON S2 Seg4 4 AC Paving Trail and Vista 12 12 12-Jul-28 27-Jul-28

CON S2 Seg4 5 Final edge grading 20 20 28-Jul-28 24-Aug-28

CON S2 Seg4 6 Landscape, Signage and Striping 15 15 28-Jul-28 17-Aug-28

CON S2 Seg4 7 Pedestrian Railing 20 20 11-Aug-28 07-Sep-28

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan FebMar 2025 2026 2027 2028 2029

Vista Build

AC Paving Trail and Vista

Final edge grading

Landscape, Signage and Striping

Pedestrian Railing

File Name: SR-28_1025 Atkins TTD - All Work Layout Page: 13 of 13

Start Date: 13-Feb-25 Finish Date: 13-Oct-28 Data Date: 15-Oct-25 Run Date: 24-Nov-25

Appendix E – Risk Register

SR28 East Shore Trail - Risk Register 30%

Risk Reserve: 2,367,000.00$ CM: TBD Risk Days 157.1 (Assumes $5k /day)

Designer: Atkins Realis Issue Date 17-Nov-25

RISK # RISK NAME DESCRIPTION

Status (Active or

Retired) OWNER RESPONSIBILITY(s) PROBABILITY IMPACT COST Weighted

IMPACT TIME

Calendar days

Weighted Time MITIGATION STRATEGY 1 RESOLUTION (DESCRIPTION)

TRIGGER TO ENGAGE RISK

RESERVE

1 Traffic Closure Approvals TBD Interagency coordination Active RSPS TTD 75% $ - $ - 28 21

Pedestrian/Business Access Work Windows @ Sand Harbor

Concern for business access to bars/restaurants.

Feedback from business owners is for work to happen. Spec requires maintainable access to businesses. Coordination with Sand Harbor Improvement Plan and Thunderbird Lodge

Active RSPS TTD/GC 75% $ 100,000 $ 75,000 0 0 Deliverys at night, discuss viability to minimize impacts to existing local business (also at north end/Incline).

Recommend review IGVID permit/ language.

3 Public Outreach Concern to express and commuicate with stakeholders

Active RSPS GC 0% $ - $ - 0 0 Assume part of basis/ original contract for scope of work

4 Big Event Coordination Memorial Day, July 4 and Labor Day, etc to be addressed w/r to lane closures

Active RSPS TTD/GC 75% NA $ - 28 21 Assume part of basis/ original contract for scope of work. To be included/assume as part of contract

5 Tarriffs/ Material Cost Escalation Assume 15% tarriff on $5M ROM Active RSPS RSPS 50% $ 750,000.00 $ 375,000 0 0 BABA assumed to be not required for this project.

Steel segement approch (tariff exposure); versus viaduct local assume fab in Montana.

6 Utility Coordination Ext Utilities at Sand Harbor; Sewer/Water in SR28 need to be protected versus SNW anchor operations

Active RSPS ATK 50% $ 1,500,000.00 $ 750,000 21 0 Ideally line be abandoned; current assumption to design around lines. Slows production to miss the impact to existing line. Assume soil nail costs by 25%

SNW Production Rate - EXPOSURE TO 3rd

CONSTRUCTION SEASON

Production rate for installing soil nails can range significantly, from approximately 15 nails per hour for a three-person crew like Summerlin Pkwy project to 250 nails per day using a high-speed, launcher-based system. Rates are influenced by factors like nail length and diameter, soil type and conditions, chosen installation method (e.g., conventional drilling vs. air cannons), the number of crew members, and the complexity of the project

Active RSPS All 75% $ - $ - 0 0

8 Labor/Resource Concerns In busy market, crews could be thin. Will need two crews to meet 5 month window for Season 1.

Active RSPS NA 25% $ - $ - 0 0 Contract language to protect TTD from crews expected to meet the agreed to approach by contract.

9 Design Changes / Scope Growth TBD alignment decisions/ Changes Active RSPS TTD/ATK 20% $ - $ - 0 0

10 Design Changes / Scope Growth 2

Specific to Sand Harbor Improvements since they control driveway location and tunnel location.

Dictates aligned of tunnel based on Sand Harbor Improvements. NSP coordination and two GC potentially occupying same space

Active RSPS TTD/ATK 90% $ 110,000.00 $ 99,000 0 0

Valid concern and risk, however ideally minimal cost/day impact. Conern to connect trail if Sand Harbor segment removed. Consider for interim improvement.

11 Early/Long Lead Procurement To start May 3, 2027; need early material NTP Jan/Feb 2027 for SNW, MSE and Tunnel TBD

Active RSPS ALL 75% $ - $ - 28 21 Assume 10 weeks longest lead item.

12 Site Access/Logistics/Lay Down Material storage, site staging availability. Cost exposure for rental/ acceptable staging rental.

Active RSPS TTD/GC 100% $ 250,000.00 $ 250,000 28 28 US Forest project availabiliy consideration follow Marlet Creek restoration project. Otherwise huge exposure for trucking off site

13 Permits (Environmental, TRPA) NDOT staffing/ process to review. Need to ensure timeframe agreeement between TTD and NDOT to review/ approve plans.

Active RSPS TTD/GC 50% $ - $ - 28 14

14 Temporary Pedestrian Paths Establish expectation at Sand Harbor for temp routes Active RSPS ATK 0% $ - $ - 0 0 Group decide non issue

15 Complete Export and Import

TBD Design balance for use of specified material.

What % of excavated matl can be reprocessed IE resistivitey required for MSE walls. Need to address in specifications

Active RSPS ATK 5% $ - $ - 0 0 TBD Small crushing operation (noise ordinance, permits). MSE fill has very specific material requirements

RISK ANALYSIS REGISTER

Owner : Tahoe Transportation District

RISK # RISK NAME DESCRIPTION

Status (Active or

Retired) OWNER RESPONSIBILITY(s) PROBABILITY IMPACT COST Weighted

IMPACT TIME

Calendar days

Weighted Time MITIGATION STRATEGY 1 RESOLUTION (DESCRIPTION)

TRIGGER TO ENGAGE RISK

RESERVE

16 Boulder Harvest and Reuse

Use of excavated Boulders for rockery walls; what percentage can be reused. Great VE option but need to understand cost exposure for needed additional materials

Active RSPS ATK 75% $ - $ - 14 10.5 Assume design contract budget able to cover few occurances.

17 Unclassified Fill

Bid Item Requirement for Disposal of Unclassified Soils. Will Over Ex be required? Borings show 9FT deep, 3 FT wide and 1000 LF. Potentail addition 500 CY add

Active RSPS ATK 15% $ 150,000 $ 22,500 0 0

18 Air Quality/ Sedimentary Controls/ SWPPS Pretty detailed SWPPS to mitigate lake settlement Active RSPS GC 100% $ - $ - 0 0 GC to bear this responsibility. Be sure to detail within contract specification.

19 Unknown Utilities TBD fiberoptic, gas and water lines Active RSPS All 10% $ - $ - 14 1.4 Days assumed at 5% of 10 moonths

Added Approvals by Agencies; IE SNW as Deferred by NDOT if in their ROW

Needs to be addressed early in Design Phase.

Forest Services and State Lands

Active RSPS ATK 25% $ - $ - 14 3.5 Additional reviews could hold work in field. Majority risk assumed to be mitigated during design phases.

21 Tunnel Lighting Need to establish lighting requirments @ Tunnel and Emergency Access

Active RSPS ATK 10% $ - $ - 0 0 Majority risk assumed to be mitigated during design phases.

22 Environmental/ Endangered/ Species Impacts To address potential new exposures post intial biology reports

Active RSPS ATK 50% $ - $ - 28 14 Also to include survey delays/ nesting birds new to site. Might be resequnce/ rephase work in field

24 Utility adds when trenching open Potential for other entities to add scope when trenches are open.

Active RSPS All 10% $ - $ - 7 0.7

26 ADA requirements Risk of unforeseen condition/ obstactles that might cause realignment

Active RSPS ATK 10% $ 50,000 $ 5,000 0 0 Majority risk assumed to be mitigated during design phases.

27 Damage to active sewer lines Active ATK ATK/GC 10% $ 50,000 $ 5,000 0 0

28 Environmental/Archeological Impacts Active RSPS All 50% $ - $ - 44 22 Also to include survey delays/ nesting birds new to site. Might be resequnce/ rephase work in field

28 Funding Limitations Active Lumos TTD 0% $ - $ - 0 0

Action Item