AK_CompiledSWPPP_AK FWS KNA 1192(1).pdf

Stormwater Pollution Prevention Plan

SWPPP

For:

Federal Highway Administration Western Federal Lands Highway Division

Table of Contents

SWPPP TABS

TAB 1: SWPPP Narrative

TAB 2: APDES Permit (Construction General Permit)

TAB 3: NOI, ADEC Acknowledgement, Other Applicable Correspondence

TAB 4: Delegation of Authority

TAB 5: Site Maps (Indicate Wetlands, Waters, other Waterbodies)

TAB 6: Erosion/Sediment Control Plan Sheets (Plan Set and BMP Typical Details)

TAB 7: Revegetation Plan (if applicable)

TAB 8: SWPPP Amendment Log

TAB 9: Inspection Reports

TAB 10: Corrective Action Log

TAB 11: Water Quality Monitoring, Reporting Requirements, and Reports

TAB 12: Training Certificates and SWPPP Training Log

TAB 13: Government-Selected Waste, Borrow, Staging Sites (Indicate BMPs at Each Site)

TAB 14: Grading and Stabilization Log

TAB 15: Hazardous Spill Plan or Spill Prevention, Control, and Countermeasures (SPCC)

TAB 16: Endangered Species Act (ESA) & Cultural Resources (Section 106) Documentation

TAB 17: Quality Assurance Checklist

TAB 18: APDES Notice of Termination (NOT)

Tab 1 - SWPPP Narrative

Revise and update as needed per SCR 107 and SCR 157

Storm Water Pollution Prevention Plan (SWPPP)

PROJECT NAME: AK FWS KNA 1192 Skilak Lake Road AOP Improvements DATE: 8/14/2023

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 1 of 39

ALASKA DEPARTMENT OF ENVIRONMENTAL CONSERVATION

2021 CONSTRUCTION GENERAL PERMIT

SWPPP TEMPLATE

Instructions

To help you develop the narrative section of your construction site SWPPP, the DEC has created this electronic

SWPPP template, designed to guide you through the SWPPP development process and ensure your SWPPP addresses all the necessary elements stated in the Construction General Permit (CGP). You should use this template with the Alaska Storm Water Guide, available on the ADEC’s website at http://dec.alaska.gov/media/13246/akswguide.pdf.

This template covers the SWPPP elements required by Alaska’s construction general permit; however, you must customize this template to reflect the conditions at your site.

Using the SWPPP Template

Each section of this template includes “instructions” and space for “project information.” You should read the instructions for each section as you complete the project information. This template was developed in Word so you can easily add tables and additional text. Some sections may require only a brief description while others may require several pages of explanation.

Tips for completing the SWPPP template

If there is more than one construction operator for your project, consider coordinating development of your

SWPPP with the other operators. Multiple operators may share the same SWPPP, but make sure responsibilities are clearly described.

Modify this SWPPP template so it meets the needs of your project. Consider adding permit citations in the

SWPPP when you address a specific permit requirement.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 2 of 39

Storm Water Pollution Prevention Plan

For

AK FWS KNA 1192(1): Skilak Lake Road AOP Improvements

Kenai National Wildlife Refuge

Soldotna, AK 99669

Insert Project Site Telephone Number (if applicable)

Operator(s)

Insert Company or Organization Name

Insert Name

Insert Address

Insert City, State, Zip Code

Insert Telephone Number

Insert Fax/Email

SWPPP Contact(s)

FHWA, Western Federal Lands Highway Division

Steve Morrow

610 East Fifth Street

Vancouver, WA 98661‐3801

(360) 619‐7700

(360) 619‐7846

SWPPP Preparation Date

8/14/2023

Estimated Project Dates Start of Construction Completion of Construction

4/15/2024 11/15/2024

APDES Project or Permit Authorization Number:

HPW‐WY65‐BV40X

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 3 of 39

RECORD OF SWPPP AMENDMENTS

See Tab 8 for SWPPP Amendments

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 4 of 39

OPERATOR PLAN

AUTHORIZATION/CERTIFICATION/DELEGATION

(To be signed by Responsible Corporate Officer)

NOTE: Refer to Tab 4 of the SWPPP for a completed/signed version of this form

I state that based on my review this SWPPP meets the minimum requirements of the Construction General

Permit and that the [Contractor TBD] has day‐to‐day operational control of the project site. [Contractor TBD] is responsible for the maintenance and implementation of the SWPPP including inspections, documentation, and application of the Best Management Practices at the site. [Contractor TBD] will notify all subcontractors of the requirement of this SWPPP.

FHWA Western Federal Lands Highway Division has operational control over the project specifications, including the ability to make changes to the project specifications.

I hereby designate FHWA Western Federal Lands Highway Division, Project Engineer, SWPPP Administrator as my authorized representative. This designee is responsible for the overall operations of the site and will be responsible for the implementation of the Storm Water Pollution Prevention Plan, compliance with the

Construction General Permit, selecting and implementing additional Best Management Practices as conditions warrant, and signing all inspection reports required.

I certify under penalty of law that this document and all attachments were prepared under direction of FHWA

Western Federal Lands Highway Division in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

FHWA Western Federal Lands Highway Division

Signature Date

Printed Name Title

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 5 of 39

(Intentionally left blank)

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 6 of 39

TABLE OF CONTENTS

1.0 PERMITTEE (5.3.1)

1.1 Operator(s)/Contractor(s)

1.2 Subcontractors

2.0 STORM WATER CONTACTS (5.3.2)

3.0 PROJECT INFORMATION (5.3.3)

3.1 Project Information

3.2 Project Site Specific Conditions (5.3.3)

4.0 NATURE OF CONSTRUCTION ACTIVITY (5.3.4)

4.1 Scope of Work

4.2 Project Function (5.3.4.1)

4.3 Support Activities (As Applicable)

4.4 Sequence and Timing of Soil‐disturbing Activities (5.3.4.2)

4.5 Size of property and total area expected to be disturbed (5.3.4.3)

4.6 Identification of All Potential Pollutant Sources (5.3.4.5)

5.0 SITE MAPS (5.3.5)

6.0 DISCHARGES

6.1 Locations of Other Industrial Storm Water Discharges (5.3.8)

6.2 Allowable Non‐Storm Water Discharges (1.4.3; 4.3.7; 5.3.9)

7.0 DOCUMENTATION OF PERMIT ELIGIBILITY RELATED TO TOTAL MAXIMUM DAILY LOADS (3.2, 5.6)

7.1 Identify Receiving Waters (5.3.3.3)

7.2 Identify TMDLs (5.6.1)

8.0 DOCUMENTATION OF PERMIT ELIGIBILITY RELATED TO ENDANGERED SPECIES (3.3, 5.7)

8.1 Information on Endangered or Threatened Species or Critical Habitat (5.7.1)

9.0 APPLICABLE FEDERAL, STATE, TRIBAL, OR LOCAL REQUIREMENTS (4.15)

10.0 CONTROL MEASURES/BEST MANAGEMENT PRACTICES (4.0; 5.3.6)

10.1 Minimize Amount of Soil Exposed During Construction Activity (4.2.2)

10.2 Maintain Natural Buffer Areas (4.2.3)

10.3 Control Storm Water Discharges and Flow Rates (4.2.5)

10.3.1 Protect Steep Slopes (4.2.6)

10.4 Storm Water Inlet Protection Measures (4.3.1)

10.5 Water Body Protection Measures (4.3.2)

10.6 Down‐Slope Sediment Controls (4.3.3)

10.7 Stabilized Construction Vehicle Access and Exit Points (4.3.4)

10.8 Dust Generation and Track‐Out from Vehicles (4.3.5 and 4.3.6)

10.9 Soil Management (4.3.7)

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 7 of 39

10.10 Authorized Non‐Storm Water Discharges (4.3.8)

10.11 Sediment Basins (4.3.9)

10.12 Dewatering (4.4)

10.13 Soil Stabilization (4.5, 5.3.6.3)

10.14 Treatment Chemicals (4.6; 5.3.6.4)

10.15 Treatment Chemicals (4.6.1)

10.15.1 Treatment Chemical Use Procedures (4.6.2)

10.15.2 Application of Treatment Chemicals (4.6.3)

10.16 Active Treatment System Information or cationic treatment chemicals (4.6.7)

10.17 Good Housekeeping Measures (4.8)

10.17.1 Washing of Equipment and Vehicles (4.8.1)

10.17.2 Fueling and Maintenance Areas (4.8.2)

10.17.3 Staging and Material Storage Areas (4.8.3)

10.17.4 Washout of Applicators/Containers Used for Paint, Concrete, and Other Materials (4.8.4)

10.17.5 Fertilizer or Pesticide Use (4.8.5)

10.18 Spill Notification (4.9)

10.19 Construction and Waste Materials (4.8.6, 5.3.7)

11.0 INSPECTIONS (5.4; 6.0)

11.1 Inspection Schedules (5.4.1.2; 6.1; 6.2)

11.2 Inspection Form or Checklist (5.4.1.3; 6.7)

11.3 Corrective Action Procedures (5.4.1.4; 8.0)

11.4 Inspection recordkeeping (5.4.2)

12.0 MONITORING PLAN (If Applicable) (5.5; 7.0)

12.1 Determination of Need for Monitoring Plan

12.2 Monitoring Plan Development

12.3 Monitoring Considerations

13.0 POST‐AUTHORIZATION RECORDS (5.8)

13.1 Additional Documentation Requirements (5.8.2)

13.1.1 Records of Employee Training (4.14; 5.8.2.7)

14.0 MAINTAINING AN UPDATED SWPPP (5.9)

14.1 Log of SWPPP Modifications (5.9.2)

14.2 Deadlines for SWPPP Modifications (5.9.3)

15.0 ADDITIONAL SWPPP REQUIREMENTS (5.10)

15.1 Retention of SWPPP (5.10.1)

15.2 Main Entrance Signage (5.10.2)

15.3 Availability of SWPPP (5.10.3)

15.4 Signature and Certification (5.10.4)

15.5 Submittal of a Modification to NOI (2.7)

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 8 of 39

APPENDICES (w/applicable SWPPP Tab reference)

A. Site Maps and Drawings (refer to Tabs 5 and 6) B. BMP Details (refer to Tab 6) C. Project Schedule (refer to latest project schedule provided by Contractor) D. Supporting Documentation: (refer to Tabs 11 and 16)

TMDLs

Endangered Species

Other Permits or Requirements E. Delegation of Authority, Subcontractor Certifications (Refer to Tab 4) F. Permit Conditions: (Refer to Tabs 2 and 3)

Copy of Signed Notice of Intent

Copy of Letter from ADEC Authorizing Coverage, with ADEC NOI Tracking Number

Copy of 2021 Construction General Permit G. Grading and Stabilization Records (Refer to Tab 14) H. Monitoring Plan (If Applicable) and Reports (Refer to Tab 11) I. Training Records (Refer to Tab 12) J. Corrective Action Log (Refer to Tab 10) K. Inspection Records (Refer to Tab 9)

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 9 of 39

(Intentionally left blank)

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 10 of 39

1.0 PERMITTEE (5.3.1)

Identify permittee and any subcontractors.

1.1 Operator(s)/Contractor(s)

Operator Information Organization: Name: Title:

Enter Text Enter Text Enter Text Phone: Fax (optional): Email:

Enter Text Enter Text Enter Text Mailing Address: Street (PO Box):

Enter Text City: State: Zip:

Enter Text Enter Text Enter Text

Area of Control

Day‐to‐day operational control of those activities at a site which are necessary to ensure compliance with a SWPPP or other permit conditions.

Owner/Operator Information Organization: Organization: Organization:

FHWA Western Federal Lands Highway Division

FHWA Western Federal Lands Highway Division

FHWA Western Federal Lands Highway Division

Phone: Phone: Phone:

(360) 619‐7700 (360) 619‐7700 (360) 619‐7700 Mailing Address: Mailing Address:

PO Box 2139 City: State: Zip:

Soldotna AK 99669

Area of Control

Operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications.

Repeat as necessary.

1.2 Subcontractors

Subcontractor Information Organization: Name: Title:

Enter Text Enter Text Enter Text Phone: Fax (optional): Email:

Enter Text Enter Text Enter Text Mailing Address: Street (PO Box):

Enter Text City: State: Zip:

Enter Text Enter Text Enter Text

Area of Control Insert Area of Control (if more than one operator at site)

Repeat as necessary to include all subcontractors.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 11 of 39

2.0 STORM WATER CONTACTS (5.3.2)

Identify the qualified persons responsible for the following required positions (note: a small project may have all these responsibilities carried out by one person):

Storm Water Lead (5.3.2); person updating the SWPPP (5.3.2.2); Person(s) Conducting Inspections (5.3.2.3); Person(s) Conducting Monitoring (if applicable, 5.3.2.4), and Person(s) Operating Active Treatment System (if applicable, 5.3.2.5).

Document that the named individuals are Qualified Persons as described in Appendix C of the CGP.

Include documentation of qualifications in Tab 4 of the SWPPP.

Qualified Personnel Responsibility

Storm Water Lead Company Name Address City, State, Zip Code Telephone # Fax/Email

Authority to stop and/or modify construction activities as necessary to comply with the SWPPP and the terms and conditions of the permit.

SWPPP Preparer

FHWA, WFLHD

Steve Morrow 610 East Fifth Street Vancouver, WA 98661

(360) 619‐7811 stephen.morrow@dot.gov

Possess the skills to assess conditions at the construction site that could impact storm water quality. Familiar with Part 5 as a means to implement the permit.

Storm Water Inspector Company Name Address City, State, Zip Code Telephone # Fax/Email

Assess conditions at the construction site that could impact storm water quality. Assess the effectiveness of any erosion and sediment control measures selected to control the quality of storm water discharge, and familiar with Part 6 as a means to ensure compliance with the permit.

Monitoring Person (If Applicable) Company Name Address City, State, Zip Code Telephone # Fax/Email

Knowledgeable in the principles and practices of water quality monitoring who is familiar with Part 7 and the monitoring plan for the site and how to conduct water quality sampling, testing, and reporting.

Active Treatment System Operator (If Applicable) Company Name Address City, State, Zip Code Telephone # Fax/Email

Knowledgeable in the principles and practices of treatment systems that employs chemical coagulation, chemical flocculation or electrocoagulation to aid in the treatment of storm water runoff. Familiar with Part 4.5 as a means to implement and comply with the permit.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 12 of 39

3.0 PROJECT INFORMATION (5.3.3)

This section gathers all relevant site data together to assist with filing for permit coverage.

3.1 Project Information

Project Name:

AK FWS KNA 1922(1): Skilak Lake Road Location Address:

Street: Borough or similar government subdivision:

33398 Ski Hill Rd (KNWR visitor center) Kenai Peninsula City: State: Zip:

Soldotna AK 99669 Latitude (decimal degree, 5 places): Longitude (decimal degree, 5 places):

Begin: 60.48406, End: 60.44081 Begin: ‐150.11286, End: ‐150.31907 Determined By: ☐ GPS x Web Map: Google Earth ☐ USGS Topo Map, Scale: Enter Text ☐ Other: Enter Text

3.2 Project Site Specific Conditions (5.3.3)

Instructions:

Briefly describe the existing site conditions, including:

Mean annual precipitation based on nearest appropriate weather station (5.3.3.1). Precipitation data for Alaska weather‐recording stations are available at the Western Regional Climate Center Internet website: https://xmacis.rcc‐acis.org/.

Soils, topography, drainage patterns, approximate growing season, and vegetation.

Evidence of site contamination.

Mean annual precipitation based on nearest weather stations (inches):

21.07”

Soil Type(s) and Slopes (describe soil type(s) and current slopes; note any changes due to grading or fill activities):

Soils within the majority of the survey area are not mapped in the NRCS Web Soil Survey. Some historic published survey data for Alaska is available on the USGS STATSGO Soil Survey. According to NRCS 2006, the dominant soil orders in this MLRA are Spodosols, Histosols, Entisols, and Inceptisols. The soils in the area have a cryic soil temperature regime, a udic or aquic soil moisture regime, and dominantly mixed mineralogy.

Haplocryods (Estelle and Kenai series), Humicryods (Talkeetna series), Eutrocryepts (Bodenburg series), and Dystrocryepts (Smithfha series) on plains and hills formed in silty loess and volcanic ash over loamy, sandy, and gravelly glacial till and outwash. These soils generally are deep and well drained. Cryaquepts (Slikok and Disappear series) on plains and hills also formed in silty loess and volcanic ash over loamy, sandy, and gravelly glacial till and outwash. They are poorly drained or very poorly drained. Cryofibrists (Salamatof series) and Cryohemists (Starichkof series) in broad shallow basins and drainageways formed in thick deposits of organic material. These Histosols are poorly drained or very poorly drained. Cryofluvents (Niklason series) and Cryaquents (Killey series) on flood plains and stream terraces formed in stratified silty and sandy alluvium over gravelly alluvium. They generally are deep and range from well drained to very poorly drained. Miscellaneous (nonsoil) areas make up about 15 percent of this MLRA. The most common miscellaneous areas are beaches, riverwash, and water There will be minimal grading in culvert locations.

Landscape Topography:

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 13 of 39

The project occurs within the Natural Resource Conservation Service (NRCS), Land Resource Region (LRR) W1‐ Southern Alaska within the Major Land Resource Area 224 – Cook Inlet Lowlands. As detailed in NRCS 2006, MLRA 224 lies within the Coastal Trough Province of the Pacific Mountains System. The terrain is dominantly a broad expanse of gently sloping to rolling plains and low‐ or moderate‐relief hills bordered by the lower slopes of the surrounding mountains. Depressions and shallow basins on plains are dotted with thousands of small and medium‐size lakes and interconnecting wetlands. Lakes also are common in low areas between hills. Rivers have relatively high gradients, and braided flood plains and low to high stream terraces are common along the rivers.

The area includes the Caribou Hills, Mt. Susitna, Beluga Mountain, and the Yenlo Hills. These are isolated, low to moderately high, rounded mountains that protrude above the surrounding terrain. Coalescing alluvial fans are common on the lower mountain slopes. Elevation ranges from sea level to 4,396 feet (0 to 1,340 meters)

Drainage Patterns (describe current drainage patterns and note any changes due to grading or fill activities):

The existing undersized pipes have been identified as obstructions to AOP passage through roadways within the study area. Removal of these structures will improve hydrological connectivity within the study area.

Approximate Growing Season:

May 20th to August 20th

Type of Existing Vegetation:

According to the 2009 KNWR CCP, over 90 exotic plant species have been recorded on the Kenai Peninsula, representing over 60 percent of the known exotic vascular plants in Alaska. Although relatively still pristine, Kenai Refuge hosts more than 300,000 annual visitors, is one of only two refuges in Alaska on the highway system, and has been the site of commercial oil and gas activities since the early 1960s. With 56 square miles of anthropogenic footprint, exotic flora are well established on certain areas of the Refuge. Most of the 62 exotic species documented are associated with roads, trails, seismic lines, utility right‐of‐ways, oil and gas infrastructure, campgrounds, and cabins. Several of the species are relatively invasive, including scotchbroom

(Cytisus scoparius), white sweetclover (Melilotus alba), bird’s vetch (Viccia cracca), and reed canary grass

(Phalaris arundinacea). Only three species of exotic vascular plants have been found on the Refuge, and these have been recorded on less than four percent of the Refuge. These species include Bigleaf lupine (Lupinus polyphyllus), Rough Meadowgrass (Poa trivialis), and common dandelion (Taraxacum officinale).

Historic site contamination evident from existing site features and known past usage of the site:

No contamination from existing site features or past site use.

4.0 NATURE OF CONSTRUCTION ACTIVITY (5.3.4)

4.1 Scope of Work

Describe the general scope of work for the project, major phases of construction, etc.

The scope of this project is to design and construct three (3) Aquatic Organism Passage (AOP) pipe culverts within the KNWR utilizing the Stream‐Simulation Methods adopted as the preferred method by the USFWS for AOP design. The first AOP structure is planned for the Skilak Lake Road crossing of Jean Creek (60.483648°, ‐150.116302°). The second AOP structure is proposed on the Upper Skilak Lake Road crossing of the Lower Ohmer Creek (60.455489°, ‐150.310281°). The third AOP structure is proposed for the Upper Skilak Lake Road crossing of an unnamed creek (60.441910°, ‐150.317851°) between Lower Ohmer Lake and the Kenai River/Skilak Lake. Both Skilak Lake Road and Upper Skilak Lake Road are located

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 14 of 39 on the State of Alaska Department of Transportation and Public Facilities (AKDOT&PF) Right‐of‐Way (ROW). The scope of work also includes road profile grade raises, where necessary, to install the AOP pipes.

The Skilak Lake Road begins at the intersection with the Sterling Highway near MP 58. The first AOP culvert occurs at Jean Creek which is located 0.25 miles in along the Skilak Lake Road. The Lower Ohmer Creek AOP is located along the Upper Skilak Lake Road, which intersects with the Skilak Lake Road at approximate milepost 8.2. The final AOP culvert occurs over an unnamed creek and is also located along the Upper Skilak Lake Road at approximate milepost 1.6. Both the Skilak Lake Road and Upper Skilak Lake Road are low‐volume, gravel‐surfaced facilities used predominately by locals and visitors for recreation. Construction is anticipated to take 1 construction season, weather dependent, and is currently scheduled for 2024 construction.

4.2 Project Function (5.3.4.1)

Briefly describe the function of the construction activity (e.g., low‐density residential, shopping mall, subdivision, airport, highway, etc.).

Low volume, gravel‐surfaces road used by locals and visitors for recreation. The purpose of the project is to protect visitor safety, preserve the KNWR roadway infrastructure, restore aquatic organism passage, and ensure the structures are of the latest design standards.

4.3 Support Activities (As Applicable)

Support activities for this project are: TBD by contractor

Support Activity Location

Dedicated

Yes No

Concrete Batch Plant ☐ ☐

Asphalt Batch Plant ☐ ☐

Equipment Staging Yards ☐ ☐

Material Storage Areas ☐ ☐

Excavated Material Disposal Areas ☐ ☐

Borrow Areas ☐ ☐

4.4 Sequence and Timing of Soil‐disturbing Activities (5.3.4.2) Briefly describe the intended sequence and timing of activities that disturb soils at the site.

Contractor to complete/update for sequence and timing

4.5 Size of property and total area expected to be disturbed (5.3.4.3) Estimate the area to be disturbed by excavation, grading, or other construction activities, including support activities described in CGP Section 1.4.2.3 (e.g., concrete or asphalt batch plants, equipment staging yards, material storage areas, excavated material disposal areas, and/or borrow areas).

Calculate the percentage of impervious surface area before and after construction.

Calculate the run‐off coefficients before and after construction.

The following are estimates of the construction site:

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 15 of 39

Total Project Area: ................................................................. 3.9499 acres

Construction‐site area to be disturbed:

Jean Creek: 1.5332 Lower Ohmer Creek: 1.3777 Unnamed Creek: 1.039 acres

Percentage impervious area BEFORE construction: .............. 5 %

Runoff coefficient BEFORE construction: .............................. 0.9

Percentage impervious area AFTER construction: ................ 5 %

Runoff coefficient AFTER construction: ................................. 0.9

4.6 Identification of All Potential Pollutant Sources (5.3.4.5) Identify and list all potential sources of sediment from construction materials and activities which may affect the quality of storm water discharges from the construction site.

Identify and list all potential sources of pollution, other than sediment, from construction materials and activities which may affect the quality of storm water discharges from the construction site.

Potential sources of sediment to storm water runoff:

Se le ct ed

A ct iv it y (X

Construction Activity

Potential Construction Site Pollutants

Se d im en t

N u tr ie n ts

B ac te ri a p H

O il

G re as e

Tr as h D e b ri s

P e st ic id es

H e av y

M e ta ls

O th e r

P o llu ta n ts

Clearing, excavating, and grading X X

Fill of roadway embankment, backfill at structures X X

Vehicle/equipment fueling and maintenance X X X

Vehicle/equipment use and storage X X

Sanitary/septic waste X X

Dewatering operations X X

Drilling and blasting operations X X X

Concrete washout and waste X X

Structure construction/painting/cleaning X X X X

Demolition and debris disposal X X X X X

Solid waste (trash and debris) X X

Hazardous waste or contaminated spills X X X

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 16 of 39

Paving operations X X

Landscaping operations X X X

Mining, rock extraction, crushing X X X

Potential pollutants and sources, other than sediment, to storm water runoff:

See table above as well as contractor info TBD.

Trade Name Material Storm Water Pollutants Location

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 17 of 39

5.0 SITE MAPS (5.3.5)

The SWPPP must include a legible site map (or set of maps for large projects) showing the entire site and identifying the following site‐specific information:

North arrow and bar scale

Property boundaries

Locations where earth‐disturbing activities will occur, noting phasing

Location of areas that will not be disturbed and natural features to be preserved

Location of all storm water conveyances including ditches, pipes, and swales

Locations of storm water inlets and outfalls, with a unique identification code for each outfall

Locations where storm water and/or authorized non‐storm water discharges to waters of the U.S.

(including wetlands) or a Municipal Separate Storm Sewer System (MS4).

Direction of storm water flow and approximate slopes anticipated after grading activities

Locations where control measures will be or have been installed

Locations where exposed soils will be or have been stabilized

Locations where post‐construction storm water controls will be or have been installed

Locations of support activities

Locations where authorized non‐storm water will be used

Locations and sources of run‐on to the site from adjacent property that may contain quantities of pollutants which could be exposed to precipitation.

Locations of all waters of the U.S. on‐site (including significant wetland areas ≥10,000 ft2) and those within 2,500 feet of the site boundary

Location of existing public water system (PWS) drinking water protection areas (DWPA) for PWS sources (e.g., springs, wells, or surface water intakes) that intersect the boundary of the project area.

(The DWPAs can be found using the interactive web map application, “Alaska DEC Drinking Water Protection Areas” located at http://dec.alaska.gov/das/GIS/apps.htm.)

Sampling point(s), if applicable

Areas where final stabilization has been accomplished

Staging and material storage areas (construction materials, hazardous materials, fuels, etc.)

Dumpsters

Porta‐potties

Concrete, paint, or stucco washout areas

Stabilized construction exits

Include a general location map in Tab 5 of this SWPPP. (5.3.4.4)

Include site maps in Tab 5 of this SWPPP. (5.3.5)

6.0 DISCHARGES

Subject to compliance with the terms and conditions of the CGP, the permittee is authorized to discharge pollutants in storm water discharges from the site. If the permittee is eligible for coverage under this permit and does not comply with the requirements of this general permit, the permittee may be in violation of this general permit for otherwise eligible discharges.

Instructions:

Describe and identify the location of any storm water discharge associated with support activities, including discharges from dedicated asphalt and concrete plants covered by this permit (5.3.8).

Identify all allowable sources of non‐storm water discharges to be used at the site (5.3.9).

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 18 of 39

6.1 Locations of Other Industrial Storm Water Discharges (5.3.8)

NA

6.2 Allowable Non‐Storm Water Discharges (1.4.3; 4.3.7; 5.3.9) Contractor TBD

If the permittee is discharging into a water body with an EPA‐established or approved Total Maximum Daily Load (TMDL), the permittee must implement measures to ensure the discharge of pollutants from the site is consistent with the assumptions and requirements of the TMDL. Refer to the CGP for additional requirements.

The SWPPP must include documentation supporting a determination of permit eligibility with regard to waters that have a TMDL.

7.1 Identify Receiving Waters (5.3.3.3)

Instructions:

List any water bodies that would receive storm water from the site, including rivers, streams, lakes, coastal waters, and wetlands. Describe each as clearly as possible (e.g., Noyes Slough, a tributary to the Chena River, etc.).

Indicate location of all water bodies on site map.

Note any stream crossings, if applicable.

List storm sewer and/or drainage systems into which storm water from the site could discharge and water body(ies) the system(s) ultimately discharge to.

Description of receiving waters:

Jean Creek (PS‐1 (A/B)) (0.16 acre, 230 linear feet) – Jean Creek is a NHD‐mapped perennial stream flowing north to south through a culvert across Skilak Lake. Jean Creek originates out of Jean Lake approximately two miles northwest of the project area and is a tributary to the Kenai River which it confluences with approximately 600 feet south of the project area. At the time of investigation, surface water flow was present. Jean Creek is a single thread meandering channel which flows from the North but backs up along Skilak Lake Road and is bounded be a large PSS/PEM wetland complex which is bounded by the Sterling Highway to the East and Skilak Lake Road on the south. Once the stream crosses through the existing roadway culverts (one 72‐inch, one 60‐inch) under Skilak Lake Road. Observed OHWM indicators include break in bank slope and change in vegetation cover and species, drift wood wracks and water lines impressed on the bank. The riparian corridor is dominated by cottonwood and birch species. Jean Creek OHWM is approximated at 12 feet wide, which then expands downstream of the project as the valley slope flattens before its confluence with the Kenai River. Channel substrate consists of cobble and gravel mixed with fines. Wetland boundaries have been conservatively mapped based off of desktop delineation methodology and are approximated to overestimate the extent of aquatic resources at this location.

Lower Ohmer Creek (PS‐2 (A,B)) (0.136 acre, 270 linear feet) – PS‐2 is a NHD‐mapped perennial stream flowing East to West connecting Upper Ohmer Lake and Lower Ohmer Lake. At the time of investigation, surface water flow was present. Lower Ohmer Creek crosses Upper Skilak Lake Road through two culverts (one 24‐inch, one 36‐inch) within the roadway prism. The culvert layout and proximity to Lower Ohmer Lake contribute to a backwater effect on the stream and a large wetland occurs on

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 19 of 39 the upstream side of the roadway. Additionally, a fringe wetland complex boarders Lower Ohmer Lake. The riparian corridor is dominated by cottonwood and birch species. Lower Ohmer Creek OHWM is approximated at 6 feet wide. Observed OHWM indicators include break in bank slope and change in vegetation cover and species, drift wood wracks and water lines impressed on the bank. Wetland boundaries have been conservatively mapped based off of desktop delineation methodology and are approximated to overestimate the extent of aquatic resources at this location.

Unnamed Creek PS‐3 (A,B) (0.108 acre (840 lnft) – PS‐3 is an NHD‐mapped Perennial stream flowing North to South connecting Lower Ohmer Lake and Skilak Lake.

At the time of investigation, surface water flow was present. The Unnamed Creek flows out of Lower Ohmer Lake before crossing Upper Skilak Lake Road through one 60‐inch culvert within the roadway prism. This creek is likely a southern segment of Lower Ohmer Creek after it flows through Lower Ohmer Lake. The creek at this location flows through a confined valley section and is bounded by a narrow riparian corridor. The culvert outlet is perched resulting in a fish passage barrier for upstream movement at this location. The riparian corridor is dominated by cottonwood and birch species. Unnamed Creek OHWM is approximated 3 feet wide within the study area. Observed OHWM indicators include break in bank slope and change in vegetation cover and species, and water lines impressed on the bank. Wetland boundaries have been conservatively mapped based off of desktop delineation methodology and are approximated to overestimate the extent of aquatic resources at this location.

Lower Ohmer Lake LS‐1 (0.137 acre (250 lnft) – LS‐1 is an NHD‐mapped Perennial lake named Lower Ohmer Lake located north of Skilak Lake.

Lower Ohmer Lake covers an area of approximately 123. Lower Ohmer Creek crosses Upper Skilak Lake Road through two culverts (one 24‐inch, one 36‐inch) within the roadway prism before entering the lake. The culvert layout and proximity to Lower Ohmer Lake contribute to a backwater effect on the stream and a large wetland occurs on the upstream side of the roadway. Additionally, a fringe wetland complex boarders Lower Ohmer Lake. The riparian corridor is dominated by cottonwood and birch species. Observed OHWM indicators include break in bank slope and change in vegetation cover and species, drift wood wracks and water lines impressed on the bank. Wetland boundaries have been conservatively mapped based off of desktop delineation methodology and are approximated to overestimate the extent of aquatic resources at this location.

Description of storm sewer and/or drainage systems:

The existing undersized pipes have been identified as obstructions to AOP passage through roadways within the study area. Changes to these structures will improve hydrological connectivity within the study area.

Other: None

7.2 Identify TMDLs (5.6.1)

Determine whether the project may discharge into a water body with an EPA‐established or approved Total Maximum Load (TMDL) for turbidity or sediment.

Instructions:

See ADEC web site for a listing of impaired water bodies: http://dec.alaska.gov/water/water‐ quality/impaired‐waters.

Look through all impaired water body categories ‐‐ 4a, 4b, and 5.

Is an EPA‐established or approved TMDL published for the receiving water(s) listed in Section 7.1? Yes No.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 20 of 39

If YES, list the TMDL(s) here. Include a summary of consultations with state or federal TMDL authorities.

Include correspondence or other supporting documentation in Tab 11.

TMDL: NA

Summary of consultation with state or federal TMDL authorities (5.6.2): NA

Measures taken to ensure compliance with TMDL (5.6.3): NA

The SWPPP must include documentation supporting a determination of permit compliance with regard to the Endangered Species Act.

Instructions:

Determine whether endangered or threatened species or their critical habitats are on or near your site.

Attach any correspondence for any stage of the project planning between the USFWS, EPA, National Marine Fisheries Service (NMFS), or others and the permittee regarding listed species and critical habitat, including any notification that delays the permittee’s authorization to discharge under this permit (Tab 16).

8.1 Information on Endangered or Threatened Species or Critical Habitat (5.7.1)

Are endangered or threatened species and critical habitats on or near the project area? Yes No.

Describe how this determination was made:

Will species or habitat be adversely affected by storm water discharge? Yes No.

Describe the species and/or critical habitat, if species or habitat will be affected by storm water discharge.

NA

Include any agency correspondence in the SWPPP (5.7.4). NA

Provide summary of necessary measures (5.7.5): NA

A permittee must ensure storm water control measures implemented at the site are consistent with all applicable federal, state, tribal, or local requirements for soil and erosion control and storm water management.

Instructions:

Describe applicable federal, state, tribal, or local requirements, if any.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 21 of 39

NA

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 22 of 39

Control Measures

Instructions:

Describe the Best Management Practices (BMPs) to be implemented to control pollutants in storm water discharges. For each major activity identified:

Clearly describe appropriate control measures.

Describe general sequence during the construction process in which the measures will be implemented.

Describe maintenance and inspection procedures to be undertaken for that specific BMP.

Include protocols, thresholds, and schedules for cleaning, repairing, and/or replacing damaged or failing BMPs.

Identify staff responsible for maintaining BMPs. (If your SWPPP is shared by multiple operators, indicate the operator responsible for each BMP.)

Categorize each BMP under one of the following areas of BMP activity as described below:

1. Minimize disturbed area (preserve native topsoil, phase construction activities) (4.2.2)

2. Maintain natural buffer areas (4.2.3)

3. Control storm water discharges and flow rates (4.2.5)

4. Protect steep slopes (4.2.6)

5. Storm drain inlet protection measures (4.3.1)

6. Water body protection measures (4.3.2)

7. Down‐slope sediment controls (4.3.3)

8. Stabilized construction vehicle access and exit points (4.3.4)

9. Dust generation and track‐out from vehicles (4.3.5, 4.3.6)

10. Stockpile Management (4.3.7)

11. Authorized Non‐Storm Water Discharges (4.3.8)

12. Sediment basins (4.3.9)

13. Dewatering (4.4)

14. Soil stabilization (4.5)

15. Treatment chemicals/Active treatment Systems (4.6)

16. Good housekeeping measures (4.8)

17. Any additional BMPs

Note the location of each BMP on your site map(s).

Any structural BMPs should have design specifications and details referred to in Tab 6.

For more information or ideas on BMPs, see the ADEC Alaska Storm Water Guide:

http://dec.alaska.gov/water/wastewater/stormwater/guidance/

10.0 CONTROL MEASURES/BEST MANAGEMENT PRACTICES (4.0; 5.3.6)

Use this section to describe the types and locations of control measures and BMPs to be installed and maintained in accordance with Section 4.0 of the CGP.

Describe each control measure and BMP, including installation schedule and maintenance, inspection, and removal requirements. You may include a brief description of each BMP in this section and refer to detailed installation, maintenance, inspection, removal requirements, and manufacturer’s specifications to be included in this narrative (standard drawings are included in Tab 6).

If a control measure or BMP will be used to comply with more than one element of this section, you do not need to repeat the detailed installation, maintenance, inspection, removal requirements, and manufacturer’s

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 23 of 39 information. For each element, identify the control measure or BMP to be used, and refer to the section or Tab 6 where the detailed information is presented.

The person(s) identified in Section 2.0 of this SWPPP will be responsible for ensuring compliance with the installation, maintenance, inspection, and removal of these control measures.

10.1 Minimize Amount of Soil Exposed During Construction Activity (4.2.2) Instructions:

Describe the areas that will be disturbed with each phase of construction and methods (signs, fences, etc.)

you will use to protect those areas that should not be disturbed.

Describe natural features identified and how each will be protected during construction activity.

Describe how topsoil will be preserved.

Phase construction activities to minimize the amount and duration of soil exposed to erosion. Establish final grade as soon as practicable and apply temporary or permanent soil stabilization measures. Limit the combined grubbing, grading, excavating, borrow, and fill within the construction limits to 5 acres

(2.0 hectares) of exposed soil at one time.

Construct temporary controls in incremental stages as construction proceeds

Construct temporary slope drains, diversion channels, and earth berms to protect disturbed areas and slopes

When a soil disturbing activity within a portion of the project is complete, apply permanent measures to the finished slopes and ditches within 14 days

When a soil disturbing activity within a portion of the project has temporarily ceased, apply temporary measures within 14 days

10.2 Maintain Natural Buffer Areas (4.2.3)

Are stream crossings or waters of the U.S. located within or immediately adjacent to the property? Yes No.

If YES, describe the control measures to be implemented to comply with the CGP Section 4.2.3 (e.g., buffer areas, perimeter controls, etc.)

Stabilize the site as soon as possible (targeting the preparation and implementation of erosion and sediment controls to get the site to final grade, and either permanently or temporarily stabilize all bare soil areas as soon as possible).

Perimeter controls will be installed before ground disturbing activities are initiated.

Perimeter protection will remain in place until final stabilization has been achieved.

Slopes and channels will be protected by conveying concentrated stormwater runoff around the top of slopes and stabilize slopes as soon as possible. Avoid disturbing natural channels and the vegetation along natural channels as much as possible.

Divert stormwater coming on to the site by conveying it safely around, through, or under the work area.

(Divert the clean water, trap the dirty water.)

Protect receiving waters and other environmentally sensitive waters or areas adjacent to the site.

Follow pollution prevention measures by providing proper containers for waste and garbage at the site.

Store hazardous materials and chemicals so that they are not exposed to stormwater.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 24 of 39

10.3 Control Storm Water Discharges and Flow Rates (4.2.5)

Instructions:

Describe control measures to comply with the CGP (e.g., divert storm water around the site, slow down or contain storm water, use of velocity dissipation devices, installing permanent storm water management controls prior to construction of site improvements to the extent practicable, etc.).

BMP Description: Check dams

Construct riprap, filter rock, gravel bags, sandbags, fiber rolls and socks, or earth berms for temporary check dams to reduce the velocity of runoff in ditches and swales

Installation Schedule: Insert text here

Maintenance and Inspection: Maintain the functionality of erosion and sediment control measures, and clean measures that are half‐full of sediment, until final acceptance or until disturbed sites are stabilized according to the CO. Remove and dispose accumulated sediment according to Subsection 204.14.

Responsible Staff: Insert text here

Repeat as needed.

10.3.1 Protect Steep Slopes (4.2.6)

Will steep slopes be present at the site during construction? Yes No.

If YES, describe control measures to be implemented to comply with CGP Section 4.2.6 (e.g., reduce continuous slope length, divert storm water around slopes, stabilized exposed areas, etc.).

BMP Description: Tackifiers

Apply turf establishment to finished slopes and ditches between [INSERT DATE] and [INSERT DATE].

Installation Schedule: Insert text here

Maintenance and Inspection: Do not apply turf establishment during windy weather or when the ground is excessively wet, frozen, snow covered, extremely dry, cloddy, hard pan, or not friable.

Responsible Staff: Insert text here

Repeat as needed.

10.4 Storm Water Inlet Protection Measures (4.3.1)

Instructions:

Describe control measures (e.g., filter berms, perimeter controls, temporary diversion dikes, etc.) to be implemented to protect all inlets receiving storm water from the project during the duration of the project.

BMP Description: Fiber Roll at Inlets

Install according to plans prior to clearing, grubbing, and grading. Install additional erosion and sediment control measures as needed during construction.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 25 of 39

Installation Schedule: Insert text here

Maintenance and Inspection: Maintain the functionality of erosion and sediment control measures, and clean measures that are half‐full of sediment, until final acceptance or until disturbed sites are stabilized according to the CO. Remove and dispose accumulated sediment according to Subsection 204.14.

Repeat as needed.

10.5 Water Body Protection Measures (4.3.2)

Instructions:

Describe control measures selected to minimize discharge of sediment prior to entry into water bodies located on or immediately downstream of the site.

BMP Description: Sediment controls (e.g., fiber rolls and/or silt fence) will be installed prior to ground disturbing activities taking place.

Installation Schedule: Insert text here

Maintenance and Inspection: Maintain the functionality of erosion and sediment control measures, and clean measures that are half‐full of sediment, until final acceptance or until disturbed sites are stabilized according to the CO. Remove and dispose accumulated sediment according to Subsection 204.14.

Responsible Staff: Insert text here

Repeat as needed.

10.6 Down‐Slope Sediment Controls (4.3.3)

Instructions:

Describe sediment controls (e.g., silt fence or temporary diversion dike) for any portion of the down‐slope perimeter where storm water will be discharged from disturbed areas of the site.

BMP Description: Fiber Rolls

Maintenance and Inspection: Maintain the functionality of erosion and sediment control measures, and clean measures that are half‐full of sediment, until final acceptance or until disturbed sites are stabilized according to the CO. Remove and dispose accumulated sediment according to Subsection 204.14.

Responsible Staff: Insert text here

Repeat as needed.

10.7 Stabilized Construction Vehicle Access and Exit Points (4.3.4) Describe location(s) of vehicle entrance(s) and exit(s), procedures to remove accumulated sediment off‐site (i.e., vehicle tracking), and stabilization practices (i.e., stone pads and/or wash racks) to minimize off‐site vehicle tracking of sediments and discharges to storm water.

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_ Skilak Lake Road.docx Page 26 of 39

Contractor (TBD)

BMP Description: Insert text here

Maintenance and Inspection: Insert text here

Responsible Staff: Insert text here

Repeat as needed.

10.8 Dust Generation and Track‐Out from Vehicles (4.3.5 and 4.3.6) Describe control measures to minimize the generation of dust and off‐site vehicle tracking of sediment.

BMP Description: Water application and no off‐site tracking

Application of water for dust control (as needed); no off‐site tracking of sediment (vehicles will stay on roads)

Installation Schedule: Insert text here

Maintenance and Inspection: Periodic inspections in accordance with CGP to ensure no sediment laden water exits construction areas.

Responsible Staff: Insert text here

Repeat as needed.

10.9 Soil Management (4.3.7)

Will soil stockpiles be at the site during construction? Yes No.

If YES, describe control measures intended to control sediment loss from the stockpiles (e.g., tarps or perimeter straw wattles). Show location(s) of stockpile(s) on site maps.

Contractor to complete/update

BMP Description: Insert text here

Installation Schedule: Insert text here

Maintenance and Inspection: Insert text here

Responsible Staff: Insert text here

Repeat as needed.

10.10 Authorized Non‐Storm Water Discharges (4.3.8)

Describe any measures taken to minimize any non‐storm water authorized by this permit.

Contractor to complete/update

𝐷𝐸𝐶 𝐶𝐺𝑃 𝑆𝑊𝑃𝑃𝑃 𝑇𝑒𝑚𝑝𝑙𝑎𝑡𝑒,𝑉𝑒𝑟𝑠𝑖𝑜𝑛 1.0, 𝐽𝑎𝑛𝑢𝑎𝑟𝑦 20, 2021 FINAL_DRAFT_SWPPP-Narrative_AK_FWS_KNA_1192_…