Interstate 15 North Phase 4 9/01/2015 VE Class. Background: I-15 North Environmental Document,...

Interstate 15 North Phase 49/01/2015 VE Class

Interstate 15 North Phase 49/01/2015 VE Class

Background: I-15 North Environmental Document, Purpose &

Project Elements

Background: I-15 North Environmental Document, Purpose &

Project Elements I-15 North Environmental

Assessment –FONSI issued May 2007

Purpose:

● Improve Safety, Operations & Access

● Decrease Congestion

● Reduce Travel Times

● Accommodate Projected Traffic

Elements

● Increase Capacity

● Interchange and ramp improvements

● Freeway Management System

Planning/NEPA/PE cost to date $ 8 million includes all phases except some of Phase 1 (Design Build) Design Cost

I-15 North Environmental Assessment –FONSI issued May 2007

Purpose:

● Improve Safety, Operations & Access

● Decrease Congestion

● Reduce Travel Times

● Accommodate Projected Traffic

Elements

● Increase Capacity

● Interchange and ramp improvements

● Freeway Management System

Planning/NEPA/PE cost to date $ 8 million includes all phases except some of Phase 1 (Design Build) Design Cost

Background: I – 15 North Phase 1 (Constructed)

Background: I – 15 North Phase 1 (Constructed)

Widened I-15 to ten lanes from US 95 (Spaghetti Bowl) to Lake Mead

Widened I-15 to eight lanes from Lake Mead Boulevard to Craig Road

Reconfigured Lake Mead Interchange – realignment of the on-ramps and off-ramps

Added Auxiliary Lanes Completed 2010, $ 270

million Cost to Construct via Design Build (DB). The DB Project included DB design cost as well as construction costs

Widened I-15 to ten lanes from US 95 (Spaghetti Bowl) to Lake Mead

Widened I-15 to eight lanes from Lake Mead Boulevard to Craig Road

Reconfigured Lake Mead Interchange – realignment of the on-ramps and off-ramps

Added Auxiliary Lanes Completed 2010, $ 270

million Cost to Construct via Design Build (DB). The DB Project included DB design cost as well as construction costs

Background: I-15 North Phase 2 (Package A & B)

Background: I-15 North Phase 2 (Package A & B)

Package A to advertise in Federal Fiscal Year (FFY) 2016.The estimated cost to construct is between $ 38.7 to $ 40.2 million Design Bid Build. Includes:

● Widen I-15 from 4 to 6 lanes for 4.8 miles

● Add Aux. Lanes between interchanges

● Restore pavement condition

● Widen & Seismic Retrofit 4 Bridges over the UPRR

● Landscape and Aesthetic Improvements

Package B -ITS completed construction in 12/2013 at a cost $ 5.234 M

Package A to advertise in Federal Fiscal Year (FFY) 2016.The estimated cost to construct is between $ 38.7 to $ 40.2 million Design Bid Build. Includes:

● Widen I-15 from 4 to 6 lanes for 4.8 miles

● Add Aux. Lanes between interchanges

● Restore pavement condition

● Widen & Seismic Retrofit 4 Bridges over the UPRR

● Landscape and Aesthetic Improvements

Package B -ITS completed construction in 12/2013 at a cost $ 5.234 M

Background: I-15 North Phase 3Background: I-15 North Phase 3

Project Design to resume 2016 Construction Packaging to be

determined Cost of Construction estimated to

be between $ 75- $ 85 M First Construction Package to

Advertise FFY 2019 Project elements

● Widen I-15 from 4 to 6 lanes (4.6 miles)

● Possible new interchange between Speedway and Apex

● Restore pavement condition

● Landscape and Aesthetic Improvements

Project Design to resume 2016 Construction Packaging to be

determined Cost of Construction estimated to

be between $ 75- $ 85 M First Construction Package to

Advertise FFY 2019 Project elements

● Widen I-15 from 4 to 6 lanes (4.6 miles)

● Possible new interchange between Speedway and Apex

● Restore pavement condition

● Landscape and Aesthetic Improvements

Overview: I-15 North Phase 4Overview: I-15 North Phase 4 Improve I-15 and CC 215

Beltway System to System Interchange ● Two concepts under

consideration (Three level & Two level)

● Improve freeway safety and operations, and local connectivity by providing a new interchange

Construction Packaging

● To be determined by March 2016

● First Construction Package FFY 2018

Cost of Construction estimated to be between $ 142 - $ 191.8 M

Improve I-15 and CC 215 Beltway System to System Interchange ● Two concepts under

consideration (Three level & Two level)

● Improve freeway safety and operations, and local connectivity by providing a new interchange

Construction Packaging

● To be determined by March 2016

● First Construction Package FFY 2018

Cost of Construction estimated to be between $ 142 - $ 191.8 M

I-15 North Phase 4 – Site ReviewI-15 North Phase 4 – Site Review

I-15 North Phase 4 – Site ReviewI-15 North Phase 4 – Site Review

I-15 North Phase 4 – Site ReviewI-15 North Phase 4 – Site Review

I-15 North Phase 4 – Site ReviewI-15 North Phase 4 – Site Review

I-15 North Phase 4 – Previous CRA

I-15 North Phase 4 – Previous CRA

Cost Risk Assessment on 9/15/14● Looked at previous 3-Level alternative

● Key Project Schedule Risks Utility Relocations Preliminary engineering/scoping takes longer than expected Delay to start of preliminary engineering scoping Deep Foundations Other large events in the area

● Key Project Cost Risks Addition ROW may be required to provide 12’ wide maintenance access along

EB CC 215 to SB I- 15 ramp Deep Foundations Preliminary engineering/scoping takes longer than expected Differing site conditions caliche Utility Relocations UPRR coordination delays construction start

Cost Risk Assessment on 9/15/14● Looked at previous 3-Level alternative

● Key Project Schedule Risks Utility Relocations Preliminary engineering/scoping takes longer than expected Delay to start of preliminary engineering scoping Deep Foundations Other large events in the area

● Key Project Cost Risks Addition ROW may be required to provide 12’ wide maintenance access along

EB CC 215 to SB I- 15 ramp Deep Foundations Preliminary engineering/scoping takes longer than expected Differing site conditions caliche Utility Relocations UPRR coordination delays construction start

I-15 North Phase 4 – Previous CRA

I-15 North Phase 4 – Previous CRA

Cost Risk Assessment on 9/15/14● Cost and Schedule

Base Cost - $ 184.88 M, Pre-Response 70th percentile - $ 251.01 M, Post-Response 70th percentile - $ 243.96 M, Project Cost Range - $ 209.02 M to 258.62 M

Base Completion Date – Dec 2021, Pre-Response 70th percentile – Apr 2023, Post-Response 70th – Dec 2022, Project Completion Date Range - May 2022 to May 2023

Cost Risk Assessment on 9/15/14● Cost and Schedule

Base Cost - $ 184.88 M, Pre-Response 70th percentile - $ 251.01 M, Post-Response 70th percentile - $ 243.96 M, Project Cost Range - $ 209.02 M to 258.62 M

Base Completion Date – Dec 2021, Pre-Response 70th percentile – Apr 2023, Post-Response 70th – Dec 2022, Project Completion Date Range - May 2022 to May 2023

I-15 North Phase 4 – Crash History

I-15 North Phase 4 – Crash History

I-15 North Phase 4 – Local Access

I-15 North Phase 4 – Local Access

I-15 North Phase 4 – UtilitiesI-15 North Phase 4 – Utilities

I-15 North Phase 4 – UtilitiesI-15 North Phase 4 – Utilities

I-15 North Phase 4 – Drainage Existing

I-15 North Phase 4 – Drainage Existing

I-15 North Phase 4 – Drainage Future Conditions

I-15 North Phase 4 – Drainage Future Conditions

I-15 North Phase 4 – BridgesI-15 North Phase 4 – Bridges

I-15 North Phase 4 – StructuresI-15 North Phase 4 – StructuresExisting Structures G-961S and G-961N (cast in place box girder structures) will be widened in Phase 2 and it is not presently anticipated that they will need to be widened again in Phase 4. However, there is sufficient width between the two bridges for additional capacity (HOV lanes). G-961R (ES2) (cast in place post tensioned box) widening proposed both alternatives, there are no factor that would preclude the use of the same structure at this location. I-2499 (TP) (cast in place post tensioned box girder) and it’s present width would accommodate one addition lane. Widening proposed in both alternatives, there are no known factors that would preclude the use of the same structure type. G2568E and G2568W (post tensioned box girder structures). The width of these structures will accommodate an additional lane in each direction. Widening of G2568W (UP1) is proposed as part of the Phase 4 projectExisting Box Culverts Local drainage throughout the area of the proposed interchange is accomplished by several large box culverts. The proposed configuration of the interchange may create the need to lengthen some of the culverts and/or provide new onesProposed Bridges The possibility of large flyover ramp structures is anticipated to complete the system interchange in both alternatives. Due to the required geometric curvature, structures of this type are most often constructed with steel plate girders. The use of cast-in-place concrete box girders is a possibility; however, the difficulty of providing the needed falsework is generally prohibitive. At the other bridge locations, there are no identifiable conditions that would preclude the use of post-tensioned, cast-in-place concrete box girder bridges, which are NDOT’s preferred structure type

I-15 North Phase 4 – PavementI-15 North Phase 4 – Pavement

I -15 Pavement● The I-15 North Phase 2 – Is adding lanes and resurfacing the I-15

pavement Mill and Overlay with 3” Plantmix Bituminous & ¾” PB Open-

Grade Widening and replacement areas - 10” Plantmix Bituminous &

¾” PB Open-Grade with 16” Type 1 Class B Aggregate Base

CC 215 Pavement● Most of the facilities on CC 215 will be removed and replaced due

to realignment

● Main Beltway was constructed with 11” PCCP

Range Road and directional ramps● Plantmix Bituminous Surfacing – Typically 6”

I -15 Pavement● The I-15 North Phase 2 – Is adding lanes and resurfacing the I-15

pavement Mill and Overlay with 3” Plantmix Bituminous & ¾” PB Open-

Grade Widening and replacement areas - 10” Plantmix Bituminous &

¾” PB Open-Grade with 16” Type 1 Class B Aggregate Base

CC 215 Pavement● Most of the facilities on CC 215 will be removed and replaced due

to realignment

● Main Beltway was constructed with 11” PCCP

Range Road and directional ramps● Plantmix Bituminous Surfacing – Typically 6”

I-15 North Phase 4 – Geotechnical

I-15 North Phase 4 – Geotechnical

Native soils ● Surface fill - Sands & gravels of varying depths (1’ to 4’). Removal, testing, and re-

compaction (if suitable)

● Native clay soils have low to high expansion potential. Highly expansive soils should be removed and replaced

Caliche● Significant layers of moderately hard caliche were encountered in some borings

● The summaries of caliche indicate a few thin layers near the surface with thickness of one to two feet

● Deeper layers, 30 to 100 feet deep, varied greatly in thickness

● Rock excavation & heavy duty excavation excavation/ripping techniques should be anticipated in areas with appreciable grading or relatively deep excavations

High Sulfate content● Sulfate resistant cement is recommended

● Corrosion reduction methods should be implemented for buried pipes

Ground Water not reported on any of the boring logs with depths up to 100’ No know fissures or faults in immediate vicinity of the project Spread footings and drilled shaft foundations are generally found to be suitable

Native soils ● Surface fill - Sands & gravels of varying depths (1’ to 4’). Removal, testing, and re-

compaction (if suitable)

● Native clay soils have low to high expansion potential. Highly expansive soils should be removed and replaced

Caliche● Significant layers of moderately hard caliche were encountered in some borings

● The summaries of caliche indicate a few thin layers near the surface with thickness of one to two feet

● Deeper layers, 30 to 100 feet deep, varied greatly in thickness

● Rock excavation & heavy duty excavation excavation/ripping techniques should be anticipated in areas with appreciable grading or relatively deep excavations

High Sulfate content● Sulfate resistant cement is recommended

● Corrosion reduction methods should be implemented for buried pipes

Ground Water not reported on any of the boring logs with depths up to 100’ No know fissures or faults in immediate vicinity of the project Spread footings and drilled shaft foundations are generally found to be suitable

I-15 North Phase 4 – Landscape Architecture

I-15 North Phase 4 – Landscape Architecture

General● North Las Vegas Community Gateway as per the I-15 Landscape and Architecture

Corridor Plan

● Up to 3% of overall construction budget for landscape and aesthetics

Landscape – Dynamic Desert Metropolis● Plants need to be drought tolerant with a cold hardy factor as low as 20 degrees F

● Landscape Materials – plant material from Mojave Desert , Sonoran Region and other dry land environments

Aesthetics● Bridge treatments, wall aesthetics, sculptural elements and color spectrums

designed to be unique but unified with I-15 Corridor Master Plan

General● North Las Vegas Community Gateway as per the I-15 Landscape and Architecture

Corridor Plan

● Up to 3% of overall construction budget for landscape and aesthetics

Landscape – Dynamic Desert Metropolis● Plants need to be drought tolerant with a cold hardy factor as low as 20 degrees F

● Landscape Materials – plant material from Mojave Desert , Sonoran Region and other dry land environments

Aesthetics● Bridge treatments, wall aesthetics, sculptural elements and color spectrums

designed to be unique but unified with I-15 Corridor Master Plan

I-15 North Phase 4 – Environmental

I-15 North Phase 4 – Environmental

General● Environmental Assessment (EA) in May 2007 for the I-15 Improvements, US- 95 to

Apex (FHWA-NV-EA 06-01) concluded with a Finding of No Significant Impact (FONSI)

Reevaluation● Generally required when there has been a time lag or changes

● Changes to: Project scope or concept Study area conditions Regulatory requirements Local priorities

● NDOT has implemented a series of questions & established a template to prepare a written reevaluation of a NEPA document

● Why? - Any design alternative developed resulting in improvements to areas outside the 2007 right-of-way or that may result in impacts not studied in the 2007 EA may require a written reevaluation

General● Environmental Assessment (EA) in May 2007 for the I-15 Improvements, US- 95 to

Apex (FHWA-NV-EA 06-01) concluded with a Finding of No Significant Impact (FONSI)

Reevaluation● Generally required when there has been a time lag or changes

● Changes to: Project scope or concept Study area conditions Regulatory requirements Local priorities

● NDOT has implemented a series of questions & established a template to prepare a written reevaluation of a NEPA document

● Why? - Any design alternative developed resulting in improvements to areas outside the 2007 right-of-way or that may result in impacts not studied in the 2007 EA may require a written reevaluation

I-15 North Phase 4 – AlternativesI-15 North Phase 4 – Alternatives

Alternatives - # 1(3-Level) & # 2(2-Level)● Alternative #1 Preliminary Cost Estimate - $ 140 Million

● Alternative # 2 Preliminary Cost Estimate - $ 126 Million

Design is at conceptual level for both alternatives Common Assumptions

● Tropical Parkway Connector will be constructed

● Range Road is not a thru Street; access is restricted within the National Guard property

● Centennial Parkway will be extended to Speedway

Alternatives - # 1(3-Level) & # 2(2-Level)● Alternative #1 Preliminary Cost Estimate - $ 140 Million

● Alternative # 2 Preliminary Cost Estimate - $ 126 Million

Design is at conceptual level for both alternatives Common Assumptions

● Tropical Parkway Connector will be constructed

● Range Road is not a thru Street; access is restricted within the National Guard property

● Centennial Parkway will be extended to Speedway

I-15 North Phase 4 – Alternative 1

I-15 North Phase 4 – Alternative 1

I-15 North Phase 4 – Alternative 1

2035 Traffic Forecasts

I-15 North Phase 4 – Alternative 1

2035 Traffic Forecasts

I-15 North Phase 4 – Alternative 1

Structures

I-15 North Phase 4 – Alternative 1

Structures

I-15 North Phase 4 – Alternative 1

Structures

I-15 North Phase 4 – Alternative 1

Structures

I-15 North Phase 4 – Alternative 1

I-15 North Phase 4 – Alternative 1

Advantages● Minimal utilities relocation

● Some utilization of existing roadways

● Some ROW acquisition & construction could be deferred until Centennial Pkwy is constructed

Disadvantages● Higher cost of bridges, embankments & walls due

to 3-level configuration

● Multiple heavy turning movements & diversion of Centennial traffic onto Range

Advantages● Minimal utilities relocation

● Some utilization of existing roadways

● Some ROW acquisition & construction could be deferred until Centennial Pkwy is constructed

Disadvantages● Higher cost of bridges, embankments & walls due

to 3-level configuration

● Multiple heavy turning movements & diversion of Centennial traffic onto Range

I-15 North Phase 4 – Alternative 2

I-15 North Phase 4 – Alternative 2

I-15 North Phase 4 – Alternative 2 2035 Traffic Forecasts

I-15 North Phase 4 – Alternative 2 2035 Traffic Forecasts

I-15 North Phase 4 – Alternative 2 Structures

I-15 North Phase 4 – Alternative 2 Structures

I-15 North Phase 4 – Alternative 2 Structures

I-15 North Phase 4 – Alternative 2 Structures

I-15 North Phase 4 – Alternative 2

I-15 North Phase 4 – Alternative 2

Advantages● Lower cost of bridges, embankments & walls due

to 2-level configuration

● Straight alignment of Centennial without heavy turning movements

● Stakeholders support Centennial being favored

Disadvantages● Utilities relocation cost at Range Road to

accommodate bridge foundations

● ROW acquisition cost for Range Rd relocation & Tropical Pkwy Extension

Advantages● Lower cost of bridges, embankments & walls due

to 2-level configuration

● Straight alignment of Centennial without heavy turning movements

● Stakeholders support Centennial being favored

Disadvantages● Utilities relocation cost at Range Road to

accommodate bridge foundations

● ROW acquisition cost for Range Rd relocation & Tropical Pkwy Extension

I-15 North Phase 4 – Right of Way

Existing

I-15 North Phase 4 – Right of Way

Existing

I-15 North Phase 4 – Right of Way Alternative 1

I-15 North Phase 4 – Right of Way Alternative 1

I-15 North Phase 4 – Right of Way

Alternative 2

I-15 North Phase 4 – Right of Way

Alternative 2

I-15 North Phase 4 – Right of Way

Summary

I-15 North Phase 4 – Right of Way

Summary

Alternative 1● Bureau of Land Management (BLM) – 40017 SF

● State of Nevada (National Guard) – 31993 SF

● Private Property – 90889 SF

Alternative 2● Bureau of Land Management (BLM) – 444 SF

● State of Nevada (National Guard) – 8881 SF

● Private Property – 60378 SF

Alternative 1● Bureau of Land Management (BLM) – 40017 SF

● State of Nevada (National Guard) – 31993 SF

● Private Property – 90889 SF

Alternative 2● Bureau of Land Management (BLM) – 444 SF

● State of Nevada (National Guard) – 8881 SF

● Private Property – 60378 SF

I-15 North Phase 4 – Other Projects

I-15 North Phase 4 – Other Projects

Sheep Mountain Parkway● CLV, in cooperation with the CNLV, NDOT, and RTC, has proposed the preservation of

a corridor for future development of this multimodal transportation facility. The proposed 22-mile-long corridor, located to the north of CC215 in the northern Las Vegas Valley

● Presently, it is not anticipated that this facility will be warranted until the 2040 – 2050 horizon years.

Sheep Mountain Parkway● CLV, in cooperation with the CNLV, NDOT, and RTC, has proposed the preservation of

a corridor for future development of this multimodal transportation facility. The proposed 22-mile-long corridor, located to the north of CC215 in the northern Las Vegas Valley

● Presently, it is not anticipated that this facility will be warranted until the 2040 – 2050 horizon years.

I-15 North Phase 4 – Other Projects

I-15 North Phase 4 – Other Projects

I-11 and Intermountain West Corridor Study

I-11 and Intermountain West Corridor Study

I-15 North Phase 4 – Other Projects

I-15 North Phase 4 – Other Projects

I-11 and Intermountain West Corridor Study● Is envisioned to be a continuous high-capacity trade

corridor extending from Nogales, Arizona to Las Vegas and potentially on towards Canada

● Alternatives include a south-west route utilizing the I-215 Bruce Woodbury Beltway, a central route utilizing US 95, and an east-north route utilizing I-15, CC215, and a new alignment to be determined to the east of the valley

● If the east-north route alternative, is determined to be the preferred route, this would redistribute traffic and add a significant new component through the I- 15/CC215 interchange

I-11 and Intermountain West Corridor Study● Is envisioned to be a continuous high-capacity trade

corridor extending from Nogales, Arizona to Las Vegas and potentially on towards Canada

● Alternatives include a south-west route utilizing the I-215 Bruce Woodbury Beltway, a central route utilizing US 95, and an east-north route utilizing I-15, CC215, and a new alignment to be determined to the east of the valley

● If the east-north route alternative, is determined to be the preferred route, this would redistribute traffic and add a significant new component through the I- 15/CC215 interchange

I-15 North Phase 4 – IssueI-15 North Phase 4 – Issue

Wall Costs vs Extending the length of the bridges● Background: The conceptual plans, for both alternatives, show the

layout of bridges and walls for the northbound I-15 ramp to westbound CC215 and Tropical Parkway.  Along this ramp there are two new bridge structures, one over UPRR and Range Road and the other over I-15.  Additionally, there are two retaining walls on the south side of the ramp.  The terrain in this area generally slopes downward from north to south and I-15 is on an embankment for its overcrossing of the UPRR and Range Road.  Because of the height of the I-15 embankment, the sloping terrain, drainage and right-of-way constraints, these retaining walls along the south side of the ramp are very tall, H max = 65'. 

● Wall costs are estimated to be $10.5 million. 

Wall Costs vs Extending the length of the bridges● Background: The conceptual plans, for both alternatives, show the

layout of bridges and walls for the northbound I-15 ramp to westbound CC215 and Tropical Parkway.  Along this ramp there are two new bridge structures, one over UPRR and Range Road and the other over I-15.  Additionally, there are two retaining walls on the south side of the ramp.  The terrain in this area generally slopes downward from north to south and I-15 is on an embankment for its overcrossing of the UPRR and Range Road.  Because of the height of the I-15 embankment, the sloping terrain, drainage and right-of-way constraints, these retaining walls along the south side of the ramp are very tall, H max = 65'. 

● Wall costs are estimated to be $10.5 million. 

I-15 North Phase 4 – IssueI-15 North Phase 4 – Issue

NDOT Project Management Division:

•Assistant Chief – Lynnette Russell•Email – lrussell@dot.state.nv.us•Phone – 702-671-6601

•Project Manager – Dwayne Wilkinson•Email – dwilkinson@dot.state.nv.us•Phone – 702-671-8879

Project Contact & Questions?Project Contact & Questions?