Categorical Exclusion Determination

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ITD 0654 (Rev. 2020) itd.idaho.gov

Categorical Exclusion Determination

PROJECT TRACKING

Key No. Project Name County Rte WA# MP MP

19171

SH75, Galena Summit Slide, Blaine Co.

Blaine SH-75 P164750 156.6 159.4

ITD: District 4 LHTAC District: Choose District Local Sponsor: ACHD: ☐ Project funding: ☒ Federal ☐ State Estimated project cost [for (c)(23) only]: $

CE DETERMINATION (choose one (c) (hover over the colon and click to select from drop-down list) or choose (d))

(c) – list Choose from drop down menu: (d) – list : ☒

☐

ITD Headquarters approval (PCE)

☒

FHWA approval (CE)

PREPARERS

Consultant (when applicable)

Engineering Lead – Printed Name and Company:

Environmental Lead – Printed Name and Company:

Erik Nyquist - POWER Engineers, Inc.

Agency

Project Manager (Digital signature or stamp required)

Lynn White

Environmental Planner (Digital signature or stamp required)

Connie Jones

APPROVED

Signature

SUPPORTING DOCUMENTATION (saved to ProjectWise):

Wetland Delineation and USACE PJD letter

19171 SGCN List 05132021 (IDFG Tier One species) 19171 Bio LOC 12282017 (

USFWS 2018-I-0237

) 19171 Biological IPAC 05042021 (T&E species)

Botanical Survey and Terrestrial Wildlife Species

USFS emails acknowledging final Biological Evaluation - of Effects on Terrestrial USFS Sensitive Species and Botanical Survey Report

FHWA No Effect Concurrence

19171 Hazard Terradex 05102021 19171 Cultural eDOAE 09192017 (

106 Adverse Effect

) 19171 FINAL BA 11172017

19171 Cultural MOA 06182018 (106 Agreement) 19171 VIA STD 03282019 (Visual & USFS email) 19171

4(f) PR 07032018 (Net Benefit

)

19171 Cultural DSE [Tribal} 05312017 (Sho-Ban letter) 19171 POP 05072021 (Public Outreach Planner Level) 19171 Cultural DSE 07072017 (form 1502)

By Connie Jones at 3:40 pm, Jul 13, 2021 Lynn White, P.E.

Digitally signed by Lynn White,

P.E.

Date: 2021.07.13 15:48:38 -06'00'

Wendy Terlizzi Digitally signed by Wendy Terlizzi

Date: 2021.07.21 08:42:18 -06'00'

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Project Description

Purpose and Need -

Purpose: The purpose of the project is to reduce the slide hazard to SH-75 and thereby improve safety for the traveling public on SH-75 near Galena Summit, near MP 156.70.

Need: An active landslide exists in this project area that requires frequent repairs to keep SH-75 open to the traveling public. The active slide is approximately 300-400 feet long, 300-400 feet wide, and 30- 40 feet deep. This landslide has damaged the highway various times in the past resulting in costly repairs and shifting of the roadway alignment. The proposed project would stabilize the landslide by buttressing the slope toe to prevent further hillside movement. The damaged sections of the existing Sawtooth Park Highway/Old US-93 road, now included in the Sawtooth National Forest (SNF) trail system, will be reconnected south of the toe berm buttress if that action is approved by the SNF that operates and maintains the trail facility.

Project Description –

Landslide Correction and Material Source Sites

The Project is located near Galena Summit, in Blaine County along SH-75 (formally known as US-93 pre-1977) along an approximately 8-mile long stretch of highway, between MP 153 and MP 161.The Project will provide correction for a historical earthen slide affecting SH-75, (as well as portions of the Sawtooth Park Highway/Old US Highway 93) at approximately MP 156.7. Correction of the slide involves the placement of a rock/soil buttress (toe berm) at the toe of the slide and the work includes treating the intermittent drainage at this location by placing it in a culvert. The Project will also

improve sections of the Sawtooth Park Highway/Old Highway 93 within and adjacent to the slide zone to allow for use of the road during the Project and monitoring after the Project. To acquire material for the rock/soil toe berm buttress, the Project will include the removal of rock and soil from one selected location adjacent to and bordering SH-75 (referred to as Camp Creek), as well as at the State-

controlled material source Cu 83s (Fourth of July) at MP 174.60 in Custer County. These two

locations are the sources of materials for the purpose of providing reclamation materials for the slide buttress area and slide face.

Rock and soil for the toe berm buttress will be acquired by drilling and blasting at the selected locations near the Camp Creek through-cut at MP 159.3 along SH-75. Removal of the shot rock/soil will include the following means: bulldozers, frontend loaders, track hoes, scrapers, graders, and trucks. The rock/soil material will be hauled and placed at the toe of the slide as the buttress. The toe berm buttress will contain approximately 100,000 cubic yards of rock and soil material. The weight of this proposed fill material in the toe berm buttress is intended to stop the slide from destroying a portion of SH-75.

Additional rock and soil will be acquired by removal from the material source location designated as Cu-83s (Fourth of July) near MP 174.60. The mineral materials will be removed by excavation utilizing the following means: crushing and screening plants, bulldozers, frontend loaders, scrapers, graders, backhoes, track hoes, and trucks. The material will be processed on site and then hauled by truck and placed as directed.

Once the buttressing is completed the Sawtooth Park Highway/Old US Highway 93 (separate from the Galena Toll Road and the current alignment of SH-75) will be reconnected south of the toe berm buttress as part of the final plan. A drilling platform(s) for the installation of instrumentation will be constructed on the slide face with access from the reconnected portion of Sawtooth Park

Highway/Old US Highway 93. Reclamation of the cut areas is anticipated to be minimal as the rock

faces will be near vertical.

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ITD Environmental Evaluation v2 September 2020

Construction is estimated to take place over 3 years. Actual construction will take about 18 months.

Work will generally take place between June 1st through November 30th, depending on the weather.

Right of Way and Easements

☒ No new ROW or easement is required for construction of this project.

☐ New ROW or easement is required for construction of this project.

Changes in Access or Access Control

☒ No changes

☐ Project will involve permanent access changes to .

☐ Project will involve access control changes to . Changes in Traffic/Travel Patterns

☒ No changes

☐ Project will involve permanent changes in vehicular travel patterns:

☐ Project will involve permanent changes in area pedestrian or bicycle travel patterns:

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SLIDE CORRECTION AREA: PROPOSED BUTTRESS AND RECONNECTION OF OLD HIGHWAY 93 TRAIL

KN 19171

PROJECT AREA PHOTOGRAPHS

Photograph 1: Slide Area and proposed toe berm buttress, looking NE.

Photograph 2: Slide Area and proposed toe berm buttress, looking SW.

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HIGHWAY 93 TRAIL

Photograph 3: Slide Area near base of proposed buttress.

Photograph 4: Sawtooth Park Highway lower access road (lower left) and upper access road (existing roadcut visible in upper right background).

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SLIDE CORRECTION AREA: PROPOSED BUTTRESS AND RECONNECTION OF OLD HIGHWAY 93 TRAIL

KN 19171

Photograph 5: Camp Creek Through-Cut Material Source Site, north (downhill) side of SH 75.

Photograph 6: Camp Creek Through-Cut Material Source Site, south (uphill) side of SH 75.

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Environmental Summary

Lands – Tribes and Management Agencies

Yes No Comment

Tribal – Reservation, Areas of Interest ☒ ☐

Shoshone-Bannock & Shoshone-Paiute

Federal ☒ ☐

U.S. Forest Service

State ☐ ☒

County ☐ ☒

Local ☐ ☒

Human and Physical Environment

Cultural Resources - Historic Properties/Sites

 Effect?

 Mitigation Required?

☒

☐

☐ Programmatic Agreement ☐ Emergency Response

☐ Cultural Resources Review ☐ 800.3(a)(1)

☐ Section 106 Interstate Exemption

☐ ACHP Post-1945 Bridge Comment

☒ Archaeological and Historic Survey Report

☒ Determination of Adverse Effect (e106) ☒ MOA

Sec 4(f) Resources

 Use?

☒

☐

Ketchum/Stanley Stock Driveway;

Galena Toll Road; and SH-75;

Sawtooth Park Highway/Old Hwy 93

Sec 6(f) Resources

 Conversion?

☐

☒

☐

Prime, Unique or Important Farmland ☐ ☒ All work w/in ROW ☐ Yes Exempt? ☐ Yes Choose land type.

Hazardous Materials

 Mitigation Required?

☐

☒

Low risk due to: none shown on Terradex Additional studies:

FAA Facilities and/or Airspace

FAA notification required?

☐

☒

☐ Airport Name: No impact:

Noise

 Type 1 Project?

 Abatement required?

☐

☒

☐

☐ Best Estimate Memo

☐ Noise Screening Analysis

☐ Traffic Noise Report Air Quality

 CO - Non-Attainment/Maintenance Area

 PM - Non-Attainment/Maintenance Area

☐

☒

Exempt Project Type? Yes ☐ CO - LOS C or better? Yes ☐ PM – Not of Concern = Exempt Yes ☐ Visual Resources and Aesthetics ☒ ☐

Social, Economic and Community Resources ☐ ☒

Environmental Justice ☐ ☒

☒ The project does not disproportionately adversely affect minority or low-income populations. The project meets the conditions set forth in the 2019/2020 FHWA/ITD Programmatic Finding on Environmental Justice.

Natural Environment

Aquatic Resources

Waters and Waters of the U.S./Wetlands - Mitigation required?

☒

☐

☒

No impact: No wetlands impacted

☒ 404 Nationwide Permit ☐ 404 Individual Permit

☐ USACE Levee

☒ Idaho Stream Channel Alteration Permit

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Environmental Summary

☐ USCG Bridge Permit Wetlands (non-jurisdictional)

- Mitigation Required?

☐

☒

No impact: No wetlands impacted

Approved Jurisdictional Determination Date:

Floodplains and Regulatory Floodways ☐ ☒

☐ The project will not substantially modify the floodplain topography in the project area, therefore no impact to floodplains are anticipated.

Wild and Scenic Rivers

☐ ☒ Choose a WSR or list study river or NRI:

Section 4(f) Resource? ☐ Yes

☐ Project repairs or rehabilitates existing structures and would not result in the significant expansion of the facility therefore would not have a negative impact on the NRI resource.

Sole Source Aquifer

☐ ☒ Choose SSA No impact:

☐ Finding: Project activities are limited to minimal grading and/or excavation and no activities that will involve penetrating deeply into the ground. Project activities have little potential to affect water quality in the sole source aquifer. Therefore, no EPA review was requested.

Biological Resources

Threatened/Endangered Species and Critical Habitat

- Conservation Measures required?

☒

☐

☒

IPaC accessed: May 4 - 2021

☒ No Effect Determination

☐ Programmatic Biological Assessment/Letter of Concurrence

☒ Biological Assessment/Letter of Concurrence

☐ Biological Assessment/Biological Opinion

Essential Fish Habitat

☐

☒

NOAA Protected Resources App accessed:

☐ No Effect Determination

☐ Programmatic Biological Assessment

☐ Letter of Concurrence

☐ Biological Assessment/Biological Opinion Species of Greatest Conservation Need

- Conservation Measures incorporated?

☒

☐

☒ Conservation Planning Tool or IFWIS accessed: May 13-2021 Federal Sensitive Species/Habitat

☒

☐

☒ See “Biological Evaluation (BE) for USFS Sensitive Species

Migratory Birds ☒ ☐ See BE for USFS – follow Best Management Practices

Bald and Golden Eagles ☒ ☐ See BE for USFS – follow Best Management Practices

Construction

Yes No

Temporary access changes, traffic control ☒ ☐ Construction projects on state highways require traffic control

Temporary impacts to services ☐ ☒

Detours ☐ ☒

Noise ordinance impacts ☐ ☒

Utility relocations ☐ ☒

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NPDES Permit

☒ ☐ ☐ < 1 ac of construction activity, PPP Plan needed

☐  1 ac of construction activity, does not discharge to WofUS;

PPP Plan needed

☒  1 ac of construction activity, discharges to WofUS

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Agency, Tribal and Organizational Coordination

Tribe Date

contacted Purpose Outcome

Shoshone-Bannock Tribes

5/24/16 4/7/17 5/31/17 9/19 /17 11/14/17 1/2/2018

introduced the project sent the Archaeological and Historic Survey Report (AHSR received comments invited Tribes to participate in MOA

Letter from Shoshone- Bannock dated May 31- 2017

ITD Project Engineer, Lynn White, attended meeting in January 2018 at Fort Hall with the Shoshone-

Bannock.

Shoshone-Paiute 11/8/2017 Introduced the project

No Comments - ITD Project Engineer, Lynn White, attended meetings for Wings and Roots

with USFS Area Ranger, Kirk Flannigan, in November 2017

Agency Date

contacted Purpose Outcome

U.S. Forest Service

Debarah J Taylor 12/10/2018 Botany accepted

Shawn Robnett P.E.

07/24/2019

Engineering On-site visit

Matt M. Phillips 4/29/2019 Scenic Resources accepted

Robin Garwood 3/9/2018 Wildlife accepted

Doug Baughman, M.S 05/06/2019 Cultural/Heritage accepted

Public Coordination and Outreach

Public Outreach Planner (POP) Level: 2 POP not accessed:

☐ Public meeting not held

Outreach Date Location Outcomes and/or Archived Information

Public Meeting - Method(s) of notification – on agenda

October 5^th, 2017

Blaine County Court

House, Hailey

Presented project at regularly held meeting of the Blaine County Regional Transportation Committee (BCRTC). 75

people on the list received email with summary of project specifics. This email and handout materials are saved to

ProjectWise. No comments were received.

Public Meeting

- Method(s) of notification:

Public notice and 267 letters to stakeholders

Tuesday, Oct. 10, 2017 4:30 to 7 p.m.

Ketchum City Hall, 480 East Ave, Ketchum

Five attendees. Handout materials and sign-in sheet saved to ProjectWise. No written comments received at the meetings. Other comments and responses saved to PWise.

A Spanish-speaking translator was at the Ketchum meeting

Public Meeting

Public notice and 267 letters to stakeholders

Wednesday, Oct. 11, 2017 4:30 to 7 p.m.

Stanley Community Building, Eva Falls Ave., Stanley

Seven attendees. Handout materials and sign-in sheet saved to ProjectWise. No written comments received at the meetings. Other comments and responses saved to PWise.

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Public Meeting

Wednesday, Oct. 29, 2018 4:30 to 7 p.m.

Stanley Community Building, Eva

Falls Ave., Stanley

Eleven attendees. Handout materials and sign-in sheet saved to ProjectWise. No written comments received at the meetings. Other comments and responses saved to PWise.

Public Meeting

Tuesday, Oct. 30, 2018 4:30 to 7 p.m.

Twelve attendees. Handout materials and sign-in sheet saved to ProjectWise. No written comments received at the

meetings. Other comments and responses saved to ProjectWise. A Spanish-speaking translator was at the

Ketchum meeting

Method(s) of notification: Future Public Meetings, Information:

Pub Notice

Fall 2023 Website TBD; Meetings will occur prior to construction. See Commitments

- -

☐ Were additional specific outreach and methods of notification required to reach specific persons or populations within the community of interest? Project fact sheets were available to attendees in English and Spanish.

Meeting notices were published twice as a legal display advertisement in The Idaho Mountain Express

(Ketchum, Idaho) and the Challis Messenger. News releases were issued to the local news outlets and are known to be published in the Idaho Mountain Express, Challis Messenger and The Times-News (Twin Falls, Idaho).

Flyers were posted in 20 public locations within the cities of Hailey, Ketchum, and Stanley as well as the Smiley Creek area.

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Section 4(f) Resources Analysis Sheet

Use of Section 4(f) Properties

Section 4(f) Property

(name)

Type Location Owner/Admin Evaluation

Choose resource type Evaluation Type

Sawtooth Park Highway / Old Hwy 93

Historic Sites SH75 MP 156.7

SHPO – letter of concurred on June 22, 2018

Programmatic Evaluation - Net Benefit

Choose resource type Evaluation Type

Temporary Uses and Exceptions

☐ Temporary occupancy of land

☐ 23 CFR 774.13 exception applies to : Choose an item.

Constructive Use

☐ The use has been determined to be a constructive use, involving no actual physical use of the Section 4(f) property. The proximity impacts of the project adjacent to, or nearby, a Section 4(f) property result in substantial impairment to the property’s activities, features, or attributes that qualify the property for protection under Section 4(f).

Public Involvement: Revealed in public meetings on:

Public Meeting

Wednesday, Oct. 29, 2018 4:30 to 7 p.m.

Stanley Community Building, Eva

Falls Ave., Stanley

Eleven attendees. Handout materials and sign-in sheet saved to ProjectWise. No written comments received at the meetings. Other comments and responses saved to PWise.

Public Meeting

Tuesday, Oct. 30, 2018 4:30 to 7 p.m.

Twelve attendees. Handout materials and sign-in sheet saved to ProjectWise. No written comments received at the meetings. Other comments and responses saved to PWise.

A Spanish-speaking translator was at the Ketchum meeting

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Hazardous Materials Evaluation Analysis Sheet – Administrative Review Form

Project Features

☐ New R/W ☐ Subsurface utility relocation

☒ Excavation ☐ Structures (buildings, bridges, box culverts, headwalls)

☐ Railroad involvement ☐ Other (list):

Radius Search Date Accessed:

☒ No sites were identified in the radius search.

☐ Sites are present in the project area. Available data has been reviewed and evaluated:

☐ Topographical characteristics are such that the project location is higher in elevation than the identified sites.

☐ Groundwater levels in the area are deeper than the depth of ground disturbance.

☐ Groundwater flows that have the potential to intersect a site located within the search radius flow away from the project area.

Site Findings

Site Type Findings

NPL

CERCLIS

CERC-NFRAP

CORRACTS RCRA-TSD CORRACTS RCRA non-TSD

RCRA

ERNS

SWF/LF

UST

LUST

Other

Agency Contacts

Agency Contact Name Date Summary

☒ DEQ

Esther Ramirez, Waste and Remediation Division. 208-373- 0200

10/22/2018 Do not have any record of spills or hazardous materials in the Project area

☒ EPA

Cheryl B Williams, Hazardous Waste Compliance, Idaho 800-424-4372 ext 2137

10/19/2018 Advised to check websites. Websites were reviewed and no listed sites in project vicinity.

☒ Health Department Matt Wildlings, 208-

788-0724 10/22/2018 Do not have any record of spills or hazardous materials in the Project area

Other Hazardous Materials

Yes No

Load-bearing structures modified or altered ☐ ☒ Asbestos survey date:

Work proposed on previously painted structures ☐ ☒

RCRA metals testing date:

Paint striping will be obliterated ☐ ☒

Windshield Survey Conducted By: Mark Pollock Company: Power Engineers, Inc. Date: 10/17/2018 Findings: No evidence or low probability of encountering HM.

Conclusion of hazardous materials assessment: No evidence or low probability of encountering HM.

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Visual Resources Analysis Sheet

The project involves the following:

☒ Cut or fill slopes substantial change

☐ New alignment

☐ New overpass

☐ New interchange

☐ New grade separation

☐ Removal of vegetative screen The viewshed contains the following:

☐ National Scenic Byways or Areas; state or locally-designated scenic routes

☐ Wild and scenic rivers, agency-designated or managed scenic rivers

☐ National Trail System and National Monuments

☐ Historic Resources (per Section 106 determination)

☐ Section 4(f) Resources

☐ Section 6(f) Lands

☐ Special roadside classification

☐ Known concerns or substantial changes in visual aspects such as aesthetics, light, glare or night sky

☐ Public comment

☐ State and Local Government managed lands

☐ State Lands (managed through Resource Conservation and Protection Plans)

☒ Federal Lands (managed through Public Land Management Plans)

☐ Project will have no effect on its visual setting because there will be no noticeable visible changes to visual resources, viewers, or visual quality.

☒ Project has potential to effect its visual setting. Summarize findings: Visual Impacts Report & USFS email concurring

Conclusion:

The potential for the subject project to cause adverse or beneficial impacts to visual resources, viewers, or visual quality is negligible due to See conclusion below:

The Project is located within the PR VQO. The Project would not be consistent with the PR VQOs because the level of contrast as viewed from Sensitivity Level 1 viewpoints would be moderate to strong in the short term even though the Project would borrow from naturally occurring vegetation and landform (rock) form, line color and texture. The intermediate-low level of VAC contributes to limited capacity of the Project to maintain a PR VQO. Impacts would be reduced with the implementation of Design Features allowing for consistency with an M VQO; this would reduce the VQO by one level in both the Camp Creek Cut Area and the Buttress Fill Area.

However, because the Project would not remain visually subordinate to the characteristic landscape in the short term, a one-time Project level exception to the PR VQO would be necessary that would meet an M VQO.

Agency coordination and/or concurrence

Agencies: U.S. Forest Service Concurrence date(s): April 29, 2019

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Biological Resources Analysis Sheet

Threatened and Endangered Species

☒ The project will have no effect on listed, threatened, endangered, proposed, or candidate species or designated critical habitat. IPaC list date:

Species analyzed in detail Reason for “no effect”

Steelhead trout (Oncorhynchus mykiss) No habitat for this species in the project area Spring/summer chinook salmon (Oncorhynchus

tshawytscha) No habitat for this species in the project area

Snake River sockeye salmon (Oncorhynchus nerka) No habitat for this species in the project area Bull Trout (Salvelinus confluentus) No habitat for this species in the project area

Choose a reason

☒ The project may affect but is not likely to adversely affect; is not likely to jeopardize the continued existence of the species or its habitat; or may impact individuals of species, but is not likely to result in a trend toward federal listing or loss of viability for the following listed, threatened, endangered, proposed, or candidate species or designated critical habitat.

Species analyzed in detail whitebark pine (Pinus albicaulis),

Canada lynx (Lynx canadensis)

North American wolverine (Gulo gulo luscus) Choose a species

Choose a species

Date of USFWS concurrence letter: Dec. 28-2017 ☐ Programmatic BA invoked Date of NOAA/NMFS concurrence letter: ☐ Other PBA invoked

☐ The project may affect and is likely to adversely affect; is likely to jeopardize the continued existence of species;

or is likely to result in the destruction or adverse modification of habitat; or is likely to result in a trend toward federal listing or loss of viability for the following listed, threatened, endangered, proposed, or candidate species or designated critical habitat.

Species analyzed in detail Choose a species

Choose a species Choose a species

Date of USFWS Biological Opinion: Date of NOAA/NMFS Biological Opinion:

Date of Essential Fish Habitat NOAA/NMFS Conservation Recommendation Acceptance Letter:

Non-ESA Sensitive Species and Habitat

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16. Boreal Owl (Aegolius funereus)

17. White-headed Woodpecker (Picoides albolarvatus)

18. American Three-toed Woodpecker (Picoides dorsalis)

19. Columbia Spotted Frog (Rana luteiventris)

16 - Temporary Impacts - not expected to result in a change in survivorship or reproductive success and no measurable change in habitat is expected 17 - No Impact - Project area does not contain habitat

18 - Temporary Impacts - not expected to result in a change in survivorship or reproductive success and no measurable change in habitat is expected

19 - May impact individuals - Potential direct mortality from project implementation. Short and long term maintenance of habitat.

Idaho Species of Greatest Conservation Need, including candidate species

Tier 1 Species IDFG Recommendation

Wolverine (Gulo gulo) No action taken as no habitat is being disturbed

I

Morrison's, Suckleys Cuckoo and Western Bumble Bee

Incorporate some pollinator plant species when re-vegetating disturbed areas.

The above list of species have been identified in the Idaho State Wildlife Action Plan (2016) as at-risk for declining populations. BMPs developed to assist in their recovery are provided in the Environmental Commitments.

Migratory Birds, Bald and Golden Eagles, and Other Wildlife and Habitat Concerns See “Biological Evaluation (BE) of the Effects of Galena Summit Slide, SH-75, Milepost 156.70 on U.S. Forest Service (USFS) Sensitive Species that are Terrestrial Wildlife Species Key No. 19171

which includes following the Best Management Practices to avoid impacts to Migratory Birds, and Eagles, etc.

Numerous migratory birds nest and forage in the subalpine forest and meadow habitat at Galena Summit. Birds are especially sensitive to disturbance during the breeding and nesting season (June 1 – August 15). To avoid inadvertently destroying nests and to minimize disturbance to nesting birds, clearing, grubbing, and tree and shrub removal will occur prior to the first year of construction, in the fall, outside the June 1 – August 15 bird breeding and nesting season.

During a July 11, 2018 site visit by biologists, no nests of swallows or other cliff-nesting species nests were observed on the rocky roadcuts that will be excavated at the Camp Creek Through-cut: therefore, impacts to cliff-nesting species are unlikely.

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Construction-Related Impacts Analysis Sheet

Temporary Access

☒ Temporary access impacts -

Construction of Access Roads:

This work entails the improvement of Sawtooth Park Highway/Old US Highway 93 for the purpose of accessing the slide zone for construction and long-term monitoring of the slide. Within the Slide Zone and Staging area (MP 156.7 of SH-75), approximately 0.35 mile of the Sawtooth Park Highway/Old US Highway 93 would require minor surface grading to allow safe travel for construction equipment and support for the construction of the slide buttress. Approximately 550 feet (0.1 mile) of Sawtooth Park Highway/Old US Highway 93 would be buried as part of the slide buttress. The trail will be re- routed and will re-connect with the existing trail south of the toe berm buttress. The new segment of the re-routed trail will not impact the Galena Toll Road situated to the south of the Sawtooth Park Highway/Old US Highway 93. Additional access roads will be constructed at Camp Creek on either side of the cut face for the purpose of drilling and blasting.

Traffic control measures required.

Areas will be utilized for traffic control at various locations on SH-75 in and near the Project area.

☐ Detours necessary

☐ Project will not involve major traffic disruptions because the following provisions will be made:

☐ Project will involve major traffic disruptions. (CE is non-programmatic)

☒ Other.

Traffic will involve major traffic disruptions as the road will be closed for blasting to all traffic.

Scheduled road closures will occur when snow is off the road. Road closures will be during the night with scheduled times to allow through traffic.

• Road closure schedules will be established in cooperation with local communities and public service

providers and will be advertised in advance to give highway users ample opportunities to adjust travel plans.

• Signs will be posted several miles on each side of the construction zone with times of closure at locations where vehicles can turn around.

• Emergency vehicles will always be allowed to pass through the project area with the minimum delay possible.

• Closure sites will be located at turnouts where vehicles can turn around.

• A traffic control plan will be developed and implemented during construction to reduce congestion and traffic delays.

• Before the first construction season, ITD will implement a public outreach plan to notify road users of anticipated closures and delays.

• During daytime hours, SH-75 will be open to allow two-way thru traffic and access to trail heads not located within the two construction sites in the project.

 Road Closure Information and Contact information for the ITD Project Manager will be made available

each week for the following week to all stakeholders by email.

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Other temporary or construction-related actions:

Tree Removal -- This work will require removal of trees at selected locations where rock/soil will be removed for use as the toe berm buttress material. Trees will also be removed at the buttress location and on the slide face. Other trees at selected locations may require removal for construction access to the excavation sites, slide, and buttress areas.

Water Withdrawal -- Water will be needed for dust control and other construction techniques during construction and for the consolidation of fill materials. An average of five truckloads of water per day (in total, an estimated 1.5 million gallons) will be needed for the proposed Project.

Location of the water withdrawal and techniques is the Contractor’s responsibility, and ITD will require that it be completed in a manner that avoids harm to listed Endangered Species Act (ESA) species and be consistent with National Oceanic and Atmospheric Administration (NOAA) Fisheries Screening Criteria (found at http://swr.nmfs.noaa.gov/hcd/ WaterDrafting- 02.PDF). ITD will work with SNF staff to identify appropriate drafting sites available for use by the Contractor. All equipment will be properly cleaned prior to use in the area to prevent the spread of aquatic invasive organisms.

Equipment Staging Areas -- A staging and production site will be located within the slide zone west of the toe berm buttress. Use will include areas for office trailers, testing facilities, equipment maintenance, stockpiling of materials, mineral materials processing, lavatories, and camping.

Portions of Sawtooth Park Highway/Old US Highway 93 east of the slide zone at MP 156.7 will be utilized for construction access, for drilling and blasting activities, staging/production, and lavatories sites.

The turnouts including the overlook and other widened paved areas adjacent to SH-75, will be utilized as staging and production areas. Use will include areas for office trailers, testing facilities, equipment maintenance, stockpiling of materials, mineral materials processing, and lavatories.

Cu-83s (MP 174.60) in addition to being utilized as a source of mineral materials will be designated as available staging areas for contractor and state equipment. Use will include areas for office trailers, testing facilities, equipment maintenance, stockpiling of materials, mineral materials processing, lavatories, and as a camp site.

The staging and production site known as Horse Creek (MP 153.80) will be designated as an

equipment staging and stockpiling area (Figure 10). The site will be utilized for office trailers, testing

facilities, equipment maintenance, stockpiling of materials, processing mineral materials, lavatory

facilities, and camping.

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Permitting Analysis Sheet

Permitting

☐ Nationwide Section 404 permit required (no PCN/“non-reporting activity”)

☒ Nationwide Section 404 permit required (Pre-Construction notification)

☐ Individual Section 404 permit required (CE is non-programmatic)

☐ Section 10 – Rivers and Harbors Act permit required - Navigable waters (CE is non-programmatic)

☒ Idaho Stream Channel Alteration permit required

☐ Bridge project on navigable lakes or rivers – USCG Section 9 permit required (CE is non-programmatic)

☐ Levee (Corps jurisdiction) Section 408 permit required (CE is non-programmatic)

☐ IDFG fish handling permit

☐ other permits required:

Notes or reference to Commitments or Mitigation:

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Environmental and Engineering Commitments/Mitigation Measures Sheet

The following commitments, contractor’s mitigation measures, permits and guidelines (as applicable) shall be included in the project special provisions:

Agency Internal Commitments

Contractor Commitments

ITD DISTRICT 4 MADE THE FOLLOWING COMMITMENTS TO FEDERAL AGENCIES WHICH WILL BE PLACED IN THE CONTRACT FOR CONSTRUCITON:

PROJECT DESIGN FEATURES FOR VISUAL

DESIGN FEATURE

NUMBER DESCRIPTION

VIS-1 Match angular, irregular variation of existing rock cut areas in areas of new excavation and blasting. Drill holes should not be apparent after project completion.

VIS-2

Retain and protect existing overstory tree cover at perimeter of rock cut areas to provide screening of new cut areas. To the extent feasible, prevent damage to adjacent and downhill ends of cut areas. Retain existing rock outcrops where practicable to maintain visual variety.

VIS-3 Provide selective planting of approved species (e.g., lodgepole pine, Douglas Fir) in areas where cut/fill would be prominent from sensitive viewpoints.

VIS-4

To the extent practicable, provide irregularly sized and spaced “planting pockets” in fill areas or at the perimeter of the fill area to break up expansive rock fill slopes and to emulate the natural variability of adjacent site conditions.

VIS-5

Match slope, surface materials, cross section, and general character of existing Old Toll Road Trail where it is re-aligned, and seed impacted areas with approved mix to match adjacent undisturbed areas. Disturbance or modification to the existing trail necessary for material hauling shall be limited to the extent necessary for Project construction, and the existing trail shall be restored to a pre-construction condition.

Design of reclamation reseeding and plantings at the edges of rock source and fill areas will be directed by the Forest Landscape Architect.

VIS-6 To the extent feasible, selectively place rock buttress fill to protect existing adjacent vegetation that provides project screening, and to limit area of disturbance to minimum required.

VIS-7 Avoid geometric edges of cut and fill areas, and “feather” fill areas into adjacent, undisturbed slopes.

VIS-8

After completion of rock cut areas, newly exposed areas will be assessed to determine the potential for surface aging treatment (e.g. Permeon® or Natina®); treatments will be applied as necessary at the direction of the Forest Landscape Architect, with the target color to match existing unaffected weathered rock as determined during field review.

Best Management Practices (BMPs), Project Design Criteria, and Other Measures to Minimize Impacts

ITD shall inspect each site prior to use and ensure that the site complies with all of the following conditions.

Temporary Sediment and Erosion Control

 Sediment and erosion control will include project perimeter controls such

as silt fencing, fiber wattle barriers and/or dikes, and ditches, as needed.

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 BMPs will be used to contain, control and filter stormwater from entering any rivers or creeks and associated wetlands and/or riparian areas.

 Inside the perimeter protection, BMPs will be used to limit and control the velocity that water runs over and through the construction-site to limit the amount of sediment picked up by stormwater. This will include placing check dams or channel liners in drainage channels, covering high use areas with coarse materials that will allow water infiltration but resist erosion and prevent rutting and mud puddles from forming during storms.

 A National Pollutant Discharge Elimination System (NPDES)

Construction General Permit (CGP) and NPDES Storm Water Pollution Prevention Plan (SWPPP) are required. The SWPPP plan must contain, at a minimum, the following elements and must meet requirements of all applicable laws and regulations.



(1) Practices to prevent erosion and sedimentation associated with access roads, construction sites, borrow site operations, equipment and material storage sites, fueling operations, staging areas, and waste sites (e.g., fiber wattles and silt fence). A supply of emergency erosion control materials will be on-hand.

(2) A description of any hazardous product or material that will be used for project, including procedures for inventory, storage, handling, and monitoring.

(3) A Spill Containment and Control Plan that includes notification procedures, specific clean up and disposal instructions for different products available on the site, proposed methods for disposal of spilled material, and employee training for spill containment.

(4) Practices to prevent construction debris from dropping into any stream or waterbody, and to remove any instream material with a minimum disturbance to the streambed and water quality.

(5)During construction, all erosion controls will be inspected daily during rainy periods, and weekly during the dry season to assure they are working correctly.

If inspection shows the erosion controls are ineffective, work crews must be mobilized immediately to make repairs, install replacements, or install additional controls as necessary. Sediment will be removed from erosion controls once it has reached one-half of the exposed height of the control.

(6) Monthly inspections of the project area will occur until the site meets permit requirements of 70 percent ground cover vegetation on disturbed slopes, no evidence of excessive soil erosion, & all temporary sediment erosion control structures/materials are removed in accordance with the NPDES SWPP plan and

the NPDES permit.

Hazardous Waste and Materials

 Fuel and other chemicals, including small fuel cans, oil and hydraulic fluid

containers, and concrete chemicals, will be stored at least 150 feet from

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any stream channel or wetland or waterbody and must be placed in a full containment cell.

 Fueling of equipment will occur at least 150 feet from any stream or waterbody.

 Tanks larger than 150-gallons must be stored at least 300 feet from any stream or waterbody.

 Spill containment kits capable of containing the amount of hazardous products on-site will be kept at the construction site and used in case of spills.

 Machinery and equipment will be outfitted with and have available spill containment kits (e.g., absorbent pads, containment structures, liners, etc.) sufficiently sized to capture and contain fuel or other petroleum products at 125% of the volumes of materials present.

 Any machinery that will be parked within 150 feet of a waterbody, including portable water pumps, will be placed in a full containment cell.

 Machinery and implements that are used during the project will be in good repair, free of excessive leaks, and steam cleaned off-site prior to entering the work area.

 Fluid leaks will either be repaired or contained within a suitable waste collection device (e.g., drip pads, drip pans).

 When changing hydraulic lines care will be taken to keep hydraulic fluid from entering a waterbody or soils.

 Water pumped from any instream excavation or other disturbances will not be placed into any waterbody until it meets IDEQ water quality

standards. The water will be land applied to suitable uplands or stored in settling basins that are large enough to treat all pumped water.

 Any hazardous/toxic materials to be used, stored, generated, and maintained must be handled following the manufacturer’s

recommendations. Manufacturer’s SDS sheets will be retained on-site.

 Reporting and remediation guidelines required by IDEQ, OSHA, and EPA will be followed. Any spills that are reported to these agencies will also be reported to the Services and the USFS.

Construction of Access Roads

 Existing roadways or travel paths must be used whenever possible.

 The number of temporary access roads will be minimized and road will be designed to avoid adverse effects.

 Access roads will not encroach upon or cross any stream, water body, or

wetland, except as permitted in the 404 permit.

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 No stream crossings may be built.

 Access ways may not be built mid-slope or on slopes greater than 30 percent.

 All temporary access roads will be obliterated when the project is completed, the soil must be stabilized, and the site re-vegetated with native species indigenous to the project area and reviewed by SNRA.

Pre-Determined Off-site Project Components - Cu-83s (4th of July source)

 Materials will be removed from, and processed in, an upland area. The area will be mined evenly in all directions and will not exceed the depth of the test pits. No wetlands or waterways will be affected by this work.

 Specifically for Cu-83s - there will be no disturbance within 50 feet of the fence on the east boundary.

 Specifically for Cu-83s - there will be no disturbance within 100 feet of FS 209/4

^th

of July Creek Road.

 A sediment and erosion control plan shall be submitted for approval as part of the Contractor’s source operation plan (also included in the NPDES SWPPP).

 A petroleum station will be constructed with a subsurface liner and berm designed to capture 110% of the tank capacity. Dispensing of petroleum products will be completed in compliance with Idaho Department of Environmental Quality standards. A spill response and spill prevention plan shall be submitted for approval as part of the Contractor’s source operation plan.

 No items will be buried or burned on site. All solid waste/refuse and hazardous materials will be removed and disposed in an approved landfill.

 A fire control plan shall be submitted for approval as part of the Contractor’s source operation plan.

 Dust abatement will be utilized when required.

 It is the Contractor’s responsibility to acquire all required agreements, permits and clearances to obtain water (if necessary) and provide copies of this documentation to the Source Manager.

 It is the Contractor’s responsibility to complete a contract with the Idaho

Department of Lands to gain permission to camp at the source sites.

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Alternative Off-Site Project Components - off-site project components include staging areas, source areas, waste sites, and any mitigation sites that have not been pre- determined. To be consistent with the overall effects determinations for this action, the off-site project components will not be located:

 Within mapped Lynx Analysis Units (LAUs).

 Within the riparian habitat conservation area (RHCA) as determined by SNRA.

Water Drafting

1. Water withdrawal will occur on the south side of Galena Summit (Big Wood River

drainage) in order to avoid impacts to ESA listed waterways that occur on the north side of Galena Summit (Upper Salmon River drainage).

2. The contractor may choose to pump water from the river for ancillary

construction activities (e.g., water for dust abatement). A 3/32-inch mesh screen as per NOAA Fisheries standards would be placed over the intake of the pump to prevent fish from being sucked into the pump. The water would be applied at a volume that would not cause surface run-off. Water drafting operations will conform to NOAA Fisheries standards found at

http://swr.nmfs.noaa.gov/hcd/WaterDrafting-02.PDF.

3. Access to sites for obtaining water will be coordinated with the USFS by the contractor when on USFS lands.

Blasting

4. Blasting will occur to remove rock from the cut-slopes. All blasting will be

conducted in association with the proposed action and will occur on the sections of SH-75 at Camp Creek (MP 159.30). There will be no more than five blast shots per 24-hour period.

Reclamation

- The soil surfaces will be left with a rough, corrugated surface to help anchor seed.

- If the slopes are cat-tracked, the tracks will be perpendicular to the slope contour.

- Disturbed areas, new cut and fill slopes, and the reclaimed roadway will be seeded with a mixture of SNRA reviewed native grasses, forbs, and/or shrubs suitable for the site.

- Flatter slopes will be drill seeded for slope protection and seed germination.

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- Dry sites may be covered with mulch such as certified weed-free straw, compost, or erosion blankets to retain moisture and facilitate seed germination and survival.

- Earthwork will be completed as quickly as possible and site restoration will occur immediately following use. Planting and re-seeding will use native species indigenous to the project area and reviewed by SNRA.

 Prior to commencing ground disturbing activities, the Contractor shall submit a Weed Control Management Plan that will identify measures to avoid the establishment and spread of noxious weeds. At a minimum, the plan shall include the inspection and cleaning of all construction equipment, use of weed free seed mulches, topsoil and seed mixtures during temporary or final

stabilization of the project areas, and the use of eradication strategies in the event a noxious weed invasion occurs. Prior to entering the confines of the USFS-SNRA the Contractor shall thoroughly wash all equipment to be utilized within the project areas or material source sites in order to remove all

contamination by noxious weeds.

A visual inspection shall be performed by the ITD Project Manager or designated appointee for the existence of noxious weeds onsite and shall identify the areas of concern prior to the contractor conducting operations in any area associated with the project. All areas that contain noxious weed seeds and/or plants shall be avoided, treated or removed from the site prior to disturbance or excavation.

No pesticide applications are allowed within 50 feet of live water.

 No surface application of inorganic fertilizer may occur within 50 feet of live water.

 Fencing must be installed as necessary to prevent access to re-vegetated sites until vegetation is established.

Mitigation

Measures to be Installed

ITD will oversee the development, production, and installation of one (1) interpretive panel that interprets the history of the transportation in the Galena Summit area. (See MOA Appendix D).

Draft content and design will be reviewed by the Idaho SHPO, Sawtooth National Forest, and Blaine County Historical Museum prior to fabrication, and will be installed at or near the

Alexander Ross Turnout, at or near milepost 160.9, or in a location easily accessible and open to the public.

Notes