CompiledSWPPP_AK for physical data.pdf

Stormwater Pollution Prevention Plan

SWPPP

For:

Replace Ghiglione Bridge

AK PRA DENA 10(36)

Denali National Park

Federal Highway Administration, Western Federal Lands Highway Division

Project Engineer:

General Contractor: ___

Table of Contents

SWPPP/ESCP TABS

TAB 1: SWPPP/ESCP Narrative

TAB 2: NPDES Permit (Construction General Permit or Corresponding State Permit)

TAB 3: NOI, EPA/State Acknowledgement, Other Applicable EPA/State Correspondence

TAB 4: Delegation of Authority

TAB 5: Maps

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/Certification Log

TAB 13: Government-Selected Waste, Borrow, Staging Sites

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: NPDES Quality Assurance Checklist

TAB 18: NPDES Notice of Termination (NOT)

Tab 1

CONTRACTOR:

Complete SWPPP narrative in accordance with contract 107.01A(b).

Revise SWPPP narrative as needed throughout construction.

ALASKA, IDAHO AND WASHINGTON PROJECTS ONLY:

SWPPP narrative must be signed by General Contractor’s responsible corporate officer as defined in permit.

File approved SWPPP narrative in Tab 1.

Stormwater Pollution Prevention Plan (SWPPP)

For Construction Activities at:

Project Name: Replace Ghiglione Bridge

AK PRA DENA 10(36)

Project Site Location: Denali National Park

City, County, State, Zip Code:

Healy, Denali Borough, Alaska, 99743

SWPPP Prepared for:

Organization Name: FHWA, Western Federal Lands Highway Division

Address: 610 East Fifth Street

Vancouver, WA 98661-3801

Telephone Number: 360-619-7700

SWPPP Prepared by:

Name, Title:

Name, Title:

Denise Steele, Environmental Protection Specialist

Company/Organization: FHWA, Western Federal Lands Highway Division

Address: 610 East Fifth Street

Vancouver, WA 98661-3801

Telephone Number: 360-619-7593

SWPPP Preparation Date: 07/24/2020

Estimated Construction Start Date: 05/10/2021 Estimated Construction Completion Date:

11/21/2021

Estimated Revegetation Start Date: 05/10/2021 Estimated Revegetation Completion Date:

4/30/2022

SWPPP TABs (SWPPP Inclusions)

TAB 1: SWPPP/ESCP Narrative

TAB 2: NPDES Permit (Construction General Permit or Corresponding State Permit)

TAB 3: NOI, EPA/State Acknowledgement, Other Applicable EPA/State Correspondence

TAB 4: Delegation of Authority

TAB 5: Maps

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 (if applicable)

TAB 12: Training/Certification Log

TAB 13: Government-Selected Waste, Borrow, Staging Sites

TAB 14: Grading and Stabilization Log

TAB 15: Hazardous Spill Plan or SPCC

TAB 16: Threatened and Endangered Species and Historic Preservation (Section 106) Documentation

TAB 17: NPDES Quality Assurance Checklist

TAB 18: NPDES Notice of Termination (NOT)

TAB 1:

SWPPP/ESCP NARRATIVE

[i]

Table of Contents

STORMWATER POLLUTION PREVENTION PLAN (SWPPP)

SECTION 1: RESPONSIBLE PARTIES/CONTACT INFORMATION

1.1 Operator(s):

1.2 Construction Site SWPPP Contact(s):

1.3 SWPPP Prepared by:

1.4 NPDES Stormwater Permit

1.5 SWPPP Administrator

1.6 Permitting Authority for FHWA/WFLHD Projects

SECTION 2: PROJECT INFORMATION

2.1 Project Name and Location

2.2 Project Site Characteristics

SECTION 3: NATURE OF CONSTRUCTION ACTIVITY

3.1 General Description of Project and Scope of Work:

3.2 Sequence and Estimated Dates of Construction Activities

3.3 Potential Sources of Pollutants

SECTION 4: SITE MAPS

SECTION 5: DISCHARGES

5.1 Allowable Non-Stormwater Discharges

5.2 Receiving Waters:

5.3 Water Quality Monitoring Requirements

SECTION 6: COMPLIANCE WITH OTHER APPLICABLE REQUIREMENTS

6.1 Endangered Species Protection

6.2 Historic Preservation

6.3 Safe Drinking Water Act Underground Injection Control Requirements

SECTION 7: EROSION AND SEDIMENT CONTROLS

7.1 Natural Buffers or Equivalent Sediment Controls (Required for EPA CGP states only ID, WA) 16

7.2 Perimeter Controls

[ii]

7.3 Sediment Track-Out

7.4 Stockpiled Soil or Other Erodible Materials

7.5 Minimize Dust

7.6 Minimize Disturbance of Steep Slopes

7.7 Topsoil Conservation

7.8 Minimize Soil Compaction

7.9 Storm Drain Inlets and Culvert Inlets

7.10 Constructed Stormwater Conveyance Channels and Culvert Outlets

7.11 Sediment Basins

7.12 Chemical Treatment

7.13 Dewatering Practices

7.14 Erosion Control and Stabilization

7.15 Removal of BMPs

7.16 Post Construction Measures

SECTION 8: OPERATIONAL CONTROLS/GOOD HOUSEKEEPING MEASURES

8.1 Hazardous Spill Plan

8.2 Spills/Releases in Excess of Reportable Quantities

8.3 Equipment/Vehicle Fueling and Maintenance Practices

8.4 Equipment/Vehicle Washing

8.5 Material Handling and Waste Management

8.6 Designate Concrete Washout Areas

SECTION 9: INSPECTIONS

9.1 Inspection Frequency

9.2 Corrective Actions

SECTION 10: DELEGATIONS OF AUTHORITY

SECTION 11: STAFF TRAINING

SECTION 12: CERTIFICATION AND NOTIFICATION

[1]

Section 1: Responsible Parties/Contact Information

1.1 Operator(s):

Organization Name: FHWA, Western Federal Lands Highway Division (WFLHD) Address: 610 East Fifth Street

Vancouver, WA 98661-3801 Telephone Number: 360-619-7700

Contractor and PE Note: Fill in all incomplete information following contract award date and prior to start of construction

(AK, ID, WA projects only) General Contractor Name:

TBD

Address:

Telephone Number:

Contractor and PE Note: Fill in all incomplete information following contract award date and prior to start of construction

1.2 Construction Site SWPPP Contact(s):

FHWA Contact Name:

Title:

TBD

Project Engineer

General Contractor, Company:

(complete for all States)

Erosion Control Supervisor Name:

(complete for all States)

1.3 SWPPP Prepared by:

Organization/Company:

Name, Position: Denise Steele, Environmental Protection Specialist Role/Responsibility SWPPP Preparer Telephone Number: 360-619-7593 Email: Denise.steele@dot.gov

[2]

1.4 NPDES Stormwater Permit

The Applicable EPA/State NPDES Stormwater Permit is located in TAB 2. The Project NOI and EPA/State Acknowledgement with NPDES Tracking Number is located in TAB 3.

1.5 SWPPP Administrator

The General Contractor (section 1.2) is responsible for maintaining the project SWPPP of Record. The General Contractor will provide a qualified Erosion Control Supervisor, who is responsible for managing the installation, maintenance, inspection, and reporting for erosion and sediment control measures, shall maintain and update the project SWPPP of Record and prepare all documentation required by the project NPDES stormwater permit and SWPPP.

The Erosion Control Supervisor (ECS) is identified in section 1.2 and his/her qualifications are documented in TAB 12.

The FHWA/WFLHD Project Engineer (PE) is the duly authorized representative of the FHWA for the purpose of overseeing compliance with the NPDES stormwater permit and SWPPP at the construction site. See Delegation of Authority TAB 4.

All SWPPP documentation, revisions/updates, and reports will be approved/signed by both the

FHWA PE.

1.6 Permitting Authority for FHWA/WFLHD Projects

Delivery Confirmation documentation of the NOI is located in TAB 3.

The applicable EPA NPDES permit is located in TAB 2

State Permitting Authority

Alaska

EPA is the permitting authority for the Denali National Park and Preserve and Metlakatla Indian Reservation.

The NOI can be filed electronically at EPAs website:

https://cdxnodengn.epa.gov/oeca-cgp-web/action/login

[3]

Section 2: Project Information

2.1 Project Name and Location

This basic site information is used to file for National Pollutant Discharge Elimination System (NPDES) permit coverage. Permit coverage is obtained by filing the Notice of Intent (NOI) after the SWPPP is complete.

Project Name: Replace Ghiglione Bridge

AK PRA DENA 10(36)

Project Site Location: Denali National Park

City, County, State, Zip Code:

Healy, Denali Borough, Alaska, 99743

Latitude/Longitude (Using one of three possible formats)

Existing:

Latitude: 63°33'31.77"N

Longitude: 149°47'39.83"W

Proposed:

Latitude: 63°33'50.27"N

Longitude: 149°48'16.75"W

The method used for determining latitude/longitude was: USGS Topographic map

Is the project located in Indian country? No

If yes, the name of Reservation is:

Name of Reservation: __________________________________

Are you applying for permit coverage as a federal operator? Yes

The project Does Not discharge stormwater into a Municipal Separate Storm Sewer System ?

2.2 Project Site Characteristics

The undeveloped site and features of the land that are incorporated into the final soil Erosion and Sediment Control plan sheets (TAB 6) , as well as natural resources that should be protected are described below:

Vegetation, trees, and sensitive areas, such as stream buffers, wetlands, highly erodible soils, and steep slopes at the site include:

Types: Vegetation: dwarf birch (Betula nana), bog blueberry (Vaccinium uliginosum), green alder (Alnus viridis), and crowberry (Empetrum nigrum). Trees:

white spruce (Picea glauca), black spruce (Picea mariana), paper birch (Betula

[4] neoalaskana), balsam poplar (Populas balsamifera), and quaking aspen (Populas tremuloides). Wetlands: Freshwater Forested/Shrub Wetland. Highly erodible soils:

No data available on USDA Web Soil Survey website.

Also, see TAB 6

Stormwater currently drains from the site in the following manner, Sheet flow from asphalt road surface into roadside ditches.

Also, see TAB 6

The location of discharge points or areas

Drainage under the Ghiglione Bridge

The location of all waters, including wetlands, are shown on the site map located in

TABs 5 and 6.

Critical slopes and slope lengths include:

Locations: None

Soil type(s) of highly erodible soils and the 1

No data available on USDA Web Soil Survey website.

Any past soil contamination at the site is identified as, None

1 NRCS Web Soil Survey.

[5]

The following natural features, including trees, streams, wetlands, slopes and other features to be protected includes:

Also see TAB 6

Protected Natural Features:

Vegetation: dwarf birch (Betula nana), bog blueberry (Vaccinium uliginosum), green alder (Alnus viridis), and crowberry (Empetrum nigrum). Trees: white spruce (Picea glauca), black spruce (Picea mariana), paper birch (Betula neoalaskana), balsam poplar (Populas balsamifera), and quaking aspen (Populas tremuloides).

Wetlands: Freshwater Forested/Shrub Wetland. Highly erodible soils: No data available on USDA Web Soil Survey website.

Measures to protect these features:

Minimization and/or avoidance of construction disturbances, buffer zones, silt fences, temporary stabilization methods, rehabilitation of disturbed areas.

Mean Annual Precipitation at the Project Site2: 14.69

The frequency, intensity, and duration of rainfall for the project site, which are the principal factors influencing erosion from a construction site, are described as, The 2-year, 24-hour storm event:3

1.48 Inches per day

The 10-year, 24-hour storm event:

2.27 Inches per day

The 25-year, 24-hour storm event:

2.76 Inches per day

Alaska Projects Only, Approximate Growing Season at the Project Site: 5/10 to 9/18

2 NRCS Annual Climate Data 3 Precipitation frequency for Western States

[6]

Section 3: Nature of Construction Activity

3.1 General Description of Project and Scope of Work:

(i.e. highway construction, roadway realignment, highway and bridge reconstruction, etc.) is described below:

Remove existing seismically deficient bridge and replace it with an earthquake ready bridge.

The type or function of the project is: Bridge Construction

: If applicable, describe any construction support activities such as dedicated concrete or asphalt batch plants, dedicated aggregate sites, equipment staging yards, material storage areas, borrow, or disposal sites (government-selected sites):

To be completed by contractor

107.01A(h)).

Support activities are located on the general vicinity map and/or site map in TAB 5 and

TAB 6.

Size of the Construction Project:

(Including all Government-selected support sites such as staging, borrow, waste, access roads, etc.)

Estimated Area Units

Total project area (outermost project footprint):

2.1 Acres

Project area to be disturbed (area of digging): 1.3 Acres

Percent Impervious Project Area BEFORE Construction: 39.8 %

Runoff Coefficient BEFORE Construction: 0.29 %

Percent Impervious Project Area AFTER Construction: 39.8 %

Runoff Coefficient AFTER Construction: 0.29 %

[7

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[8

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[9]

3.3 Potential Sources of Pollutants

The follow table identifies all potential sources (checked activities in column 1) of sediment and other sources of pollution, which may reasonably be expected to affect the quality of stormwater discharges from the construction site.

Se le ct ed

A ct iv it y (X

Construction Activity

Potential Construction Site Pollutants

Se d im en t

N ut ri en ts ac te ri a pH

O il

G re as e

T ra sh eb ri s

P es ti ci de s

H ea vy M et al s

O th er ol lu ta nt s

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

Paving operations X X

Landscaping operations X X X

Mining, rock extraction, crushing X X X

Contractor and PE

Note: Fill in all incomplete information following contract award date and prior to start of construction

Construction and waste material expected to be stored on-site includes:

Material Storage Location

To be completed by contractor

[10]

Section 4: Site Maps

Vicinity maps are located in TAB 5. Site maps and erosion and sediment control plan maps are located in TAB 6.

[11]

Section 5: Discharges

Industrial stormwater discharges associated with industrial activity other than construction at the site (including dedicated asphalt plants and dedicated concrete plants that are covered by this permit) include:

NOTE: An Industrial Activity Multi-Sector General Permit may be required for some activities.

Industrial Activity Stormwater Discharge Location

Multi-Sector General Permit Number (if applicable)

1.None

2.

3.

5.1 Allowable Non-Stormwater Discharges

Non-stormwater discharges used at the construction sited are identified below, along with control measures used to eliminate or reduce the discharges and BMPs used to prevent stormwater contamination.

Applicable to this Project

(check all that apply)

Potential Non-Stormwater Discharges Control Measures

Waters used to wash vehicles where detergents are not used

Water used to control dust

Potable water including uncontaminated water line flushings

Construction dewatering (uncontaminated)

Ground water or spring water (uncontaminated)

Routine external building wash down that does not use detergents

Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (unless all spilled material has been removed) and where detergents are not used

Foundation or footing drains where flows are not contaminated with process materials such as solvents

Landscape irrigation

Discharges from emergency fire-fighting activities

Fire hydrant flushings

Uncontaminated air conditioning or compressor condensate

NOTE: The likely locations of these discharges are identified on the site map TAB 5 and/or

TAB 6

[12]

5.2 Receiving Waters:

Are there any surface waters located within 50 feet of the construction disturbance? Yes

Name(s) of the first surface water that receives stormwater directly from your site and/or from the MS4

Unnamed creek_Ghiglione drainage

Impaired Waters/TDMLs:

Answer the following for each surface water listed in Table 1:

Is this surface water listed as

What pollutant(s) is causing the impairment?

Has a TMDL been completed?

Pollutant(s) for which there is a TDML

1. Yes No Yes No

2. Yes No Yes No

Source used to determine whether or not your project discharges into an impaired water:

https://dec.alaska.gov/water/water-quality/integrated-report

Tier 2, 2.5 or 3 Waters

Answer the following for each surface water listed in Table 1:

Is this surface water designated as Tier 1,2 or 3?

If yes, specify which Tier.

1. Yes No Choose an item.

2. Yes No Choose an item.

If applicable, documentation of consultation with State or Federal TMDL authorities on consistency of SWPPP conditions with the approved TMDL is found in TAB 11. The control measures required to ensure that discharge of pollutants from the site are consistent with the assumptions and requirements of the EPA-established or approved TMDL, including any specific waste-load allocations are included in that documentation.

5.3 Water Quality Monitoring Requirements

Provisions in Permit Conditions of the applicable NPDES stormwater permit, as well as the associated §401 certification or other special conditions, define additional monitoring and reporting requirements. Details about water quality monitoring and reporting requirements applicable to this project are included in TAB 11.

Samples and measurements taken for the purpose of monitoring will be representative of the monitored activity. Records of all monitoring information will be retained in TAB 11, including

[13] all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation.

Records of monitoring information will include:

1. The date, exact place, and time of sampling or measurements;

2. The individual(s) who performed the sampling or measurements;

3. The date(s) analyses were performed

4. The individual(s) who performed the analyses;

5. The analytical techniques or methods used; and

6. The results of such analyses.

Section 6: Compliance with Other Applicable Requirements

6.1 Endangered Species Protection

Under which criterion is project eligible for Endangered Species coverage under the NPDES permit (EPA)?

A B C D E

Criterion A. No federally-listed threatened or endangered species or their designated critical habitat(s)

EPA permit.

Criterion B. -related activities were your action area under eligibility Criterion A, C, D, E, or F and there is no reason to believe that federally-listed species or federally-designated critical habitat not considered in the prior certification may be present or there must be no lapse of NPDES permit coverage in th certification. By certifying eligibility under this Criterion, you agree to comply with any effluent limitations or conditions upon which the other operator's certification was based. You must include in your NOI the tracking number from certification under Criterion C, you must provide EPA with the relevant supporting information required of existing dischargers in Criterion C in the EPA NOI form.

Criterion C Federally-listed threatened or endangered species or their designated

-related activities are not likely to adversely affect listed threatened or endangered species or critical habitat. This determination may include consideration of any stormwater controls and/or management practices you will adopt to ensure that your discharges and discharge-related activities are not likely to adversely affect listed species and critical habitat. To make this certification, you must include the following in your NOI: 1) any federally

[14]

2) the distance between your site and the listed species or designated critical habitat (in miles). You must also include a copy of your site map with the NOI.

Criterion D. Coordination between you and the Services has been concluded. The coordination must discharge-related activities on federally-listed threatened or endangered species and federally-designated critical habitat, and must have resulted in a written concurrence from the relevant Service( discharges and discharge-related activities are not likely to adversely affect listed species or critical habitat. You must include copies of the correspondence between yourself and the Services in your SWPPP and

NOI.

Criterion E. Consultation between a Federal Agency and the U.S. Fish and Wildlife Service and/or the National Marine Fisheries Service under section 7 of the ESA has been concluded. The consultation must have addressed discharge-related activities on federally-listed threatened or endangered species and federally-designated critical habitat. The result of this consultation must be either:

i. a biological opinion that concludes that the action in question (taking into accou -related activities) is not likely to jeopardize the continued existence of listed species, nor the destruction or adverse modification of critical habitat;

or

ii. written concurrence from the applicable Service(s) with a finding that -related activities are not likely to adversely affect federally-listed species or federally-designated habitat.

You must include copies of the correspondence between yourself and the Services in your SWPPP and NOI.

Criterion F. Your construction activities are authorized through the issuance of a permit under section 10 of the ESA, and this authorization addresses the

-related activities on federally-listed species and federally-designated critical habitat. You must include copies of the correspondence between yourself and the Services in your SWPPP and NOI.

Support Documentation for Endangered Species criterion eligibility is filed in TAB 16.

6.2 Historic Preservation

1. Will the project involve installation of any of the following stormwater controls that entail subsurface earth disturbance? Yes

Dike

Berm

[15]

Catch Basin

Pond

Ditch, trench, swale, perimeter drain, etc.

Culvert

Other ground-disturbing stormwater control Click here to enter text.

If the project involves no installation of earth-disturbing stormwater controls, then no further historic preservation screening is necessary (for NPDES permitting purposes).

2. If answer to step 1 is Yes, have professional surveys or evaluations determined that historic properties do not exist (or have prior disturbances at the site precluded the existence of historic properties)? No

Provide documentation for the basis of this determination. SHPO Concurrence Letter dated 8/22/2019, concurring with finding of Adverse Effect.

3. If answer to step 2 is No, have professional surveys or evaluations determined that installation of stormwater controls will have no effect on historic properties? No

Provide documentation for the basis of this determination. SHPO Concurrence Letter dated 8/22/2019, concurring with finding of Adverse Effect

4. Has the State Historic Preservation Officer (SHPO), Tribal Historic Preservation Office (THPO) or other tribal representative concurred with the determinations of effects on historic properties? Yes

Provide the nature of their response. SHPO Concurrence Letter dated 8/22/2019, concurring with finding of Adverse Effect and Programmatic Agreement between NPS and the SHPO, signed by SHPO on 8/18/2020

6.3 Safe Drinking Water Act Underground Injection Control Requirements

Will the project plan install any of the following controls? No

Check all that apply:

Infiltration trenches (if stormwater is directed to any bored, drilled, driven shaft or dug hole that is deeper than is widest surface dimension, or has a subsurface fluid distribution system)

Commercially manufactured pre-cast or pre-built proprietary subsurface detention vaults, chambers, or other devices designed to capture and infiltrate stormwater flow.

Drywells, seepage pits, or improved sinkholes (if stormwater is directed to any bored, drilled, driven shaft or dug hole that is deeper than its widest surface dimension, or has a subsurface fluid distribution system)

If yes, provide documentation of communications with the EPA or applicable State agency.

Click here to enter text.

[16]

Section 7: Erosion and Sediment Controls

Control measures at the construction site are selected, installed, implemented, and maintained to minimize pollutants in the discharge as necessary to meet applicable water quality standards.

The objectives of this SWPPP include:

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.

Minimize the area and duration of exposed soils. Clear only land that will be under construction in the near future.

7.1 Natural Buffers or Equivalent Sediment Controls (Required for EPA CGP states only ID, WA) disturbing activities.

Are there any surface waters within 50 feet of the project s earth disturbances? Yes

If No, then no further documentation is required for the SWPPP.

NOTE: Reference EPA CGP appendix G for buffer guidance.

If Yes, check which natural buffer compliance alternative is used at the project site:

The project will provide and maintain a 50-foot wide undisturbed natural buffer.

The location and width of natural buffers are shown on the Erosion and Sediment Control Plan sheets in TAB 6.

[17]

The project will provide and maintain an undisturbed natural buffer that is less than 50 feet in width and is supplemented by additional erosion and sediment controls, which in combination achieves the sediment load reduction equivalent to a 50-foot undisturbed natural buffer.

The location of natural buffers are shown on the Erosion and Sediment Control Plan sheets in TAB 6.

Insert the width of the natural buffer to be retained Click here to enter text.

Insert description of additional erosion and sediment controls to be used in combination with the natural buffer: Click here to enter text.

Document the method used to determine that the above combination of natural buffer and sediment and erosion controls equal the estimated sediment removal capacity of a 50-foot undisturbed natural buffer: Click here to enter text.

It is infeasible to provide and maintain an undisturbed natural buffer of any size, therefore, the project will implement erosion and sediment controls that achieve the sediment load reduction equivalent to a 50-foot undisturbed natural buffer.

Insert rationale for concluding that providing and maintaining a natural buffer of any size is infeasible: Culverts that are being replaced are the discharge points.

Insert description of erosion and sediment controls to be used to achieve the sediment load reduction equivalent to a 50-foot undisturbed natural buffer: Waddles, check dams, silt fence, and stream diversions.

The project qualifies for one of the exceptions in EPA CGP Part 2.1.2.1.e site constraints (e.g. limited right of way) make it infeasible for the project to meet any of the CGP part 2.1.2.1.a compliance alternatives.

Other exception (state type): Click here to enter text.

Document why it is infeasible to meet one of the buffer compliance alternatives: Click here to enter text.

Insert description of erosion and sediment controls to be used to achieve the sediment load reduction equivalent to a 50-foot undisturbed natural buffer: Click here to enter text.

7.2 Perimeter Controls

All Perimeter Sediment Controls will be installed prior to ground disturbing activities taking place. There will be no clearing or grubbing outside the physical clearance limits.

Locations and design specifications of BMPs are shown on the erosion and sediment control plan sheets in TAB 6.

The following perimeter controls will be implemented:

[18]

Control measure: Fiber rolls

Implementation: All fiber rolls will be installed prior to any ground disturbing activities. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Sediment will be removed from fiber roll perimeter controls before erosion control measures as necessary if the sediment controls are ineffective and turbid water is observed discharging from the site. Fiber rolls will not be removed until vegetation is satisfactorily established.

Control measure: Silt Fence

Implementation: The silt fence shall be functional before other land disturbing activities take place. Silt fence should be functional throughout the duration of construction and for a long enough duration following construction to allow disturbed areas to stabilize following revegetation and seeding. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Silt fences should be inspected periodically for damage (such as tearing by wind, animals, or equipment) and for sediment that has accumulated. Remove the sediment when it reaches one-half the height of the silt fence. In situations where access is available, machinery can be used. Otherwise, silt should be removed manually. The following are key elements to remember:

The sediment deposits should be removed when heavy rain or high water is anticipated.

The sediment deposits should be placed in an area where there is little danger of erosion.

The silt fence should not be removed until adequate vegetative growth ensures no further erosion of the slopes. Generally, the fabric is cut at ground level, the wire and posts are removed, then the sediment is spread, seeded, and protected (mulched) immediately.

Note: Add additional measures used during construction.

7.3 Sediment Track-Out

The following methods will be implemented to minimize off-site vehicle tracking of sediment onto paved surfaces. If sediment escapes the construction site, off-site accumulations of sediment will be removed at a frequency sufficient to minimize off-site impacts.

Locations and design specifications of BMPs are shown on the erosion and sediment control plan

Not applicable to this project. Reason: Click here to enter text.

If applicable:

Control measure: Washing within perimeter, without detergents or solvents

Implementation: During active construction, as necessary. Please also refer to project schedule, contract, and plan set (Erosion Control section).

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Maintenance requirements: Care must be taken that runoff is directed within construction perimeter and is to be managed by established control methods already in place. Any uncontrollable runoff must be remedied and additional BMPs put in place.

Control measure: Stabilized Construction Exit

Implementation: Wherever traffic will be leaving a construction site and traveling onto paved roads or other paved areas, within 1,000 feet of the site. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Any sediment that is tracked onto pavement shall be removed by shoveling or sweeping. The sediment collected by sweeping shall be removed or stabilized on site. The pavement shall not be cleaned by washing down the street, except when sweeping is ineffective and there is a threat to public safety.

7.4 Stockpiled Soil or Other Erodible Materials

Stockpile management includes measures to minimize surface erosion and sediment transport from soil stockpiles or other erodible materials.

Locate erodible stockpiles away from drainages including storm sewer inlets and culvert inlets.

Locations of stockpiles are shown on the erosion and sediment control plan sheets in TAB 6.

Control measure: Fiber rolls

Implementation: All fiber rolls will be installed prior to any ground disturbing activities. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Sediment will be removed from fiber roll perimeter controls before deposits reach 50% of the erosion control measures as necessary if the sediment controls are ineffective and turbid water is observed discharging from the site. Fiber rolls will not be removed until vegetation is satisfactorily established.

Control measure: Silt Fence

Implementation: The silt fence shall be functional before other land disturbing activities take place. Silt fence should be functional throughout the duration of construction and for a long enough duration following construction to allow disturbed areas to stabilize following revegetation and seeding. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Silt fences should be inspected periodically for damage (such as tearing by wind, animals, or equipment) and for sediment that has accumulated. Remove the sediment when it reaches one-half the height of the silt fence. In situations where access is

[20] available, machinery can be used. Otherwise, silt should be removed manually. The following are key elements to remember:

The sediment deposits should be removed when heavy rain or high water is anticipated.

The sediment deposits should be placed in an area where there is little danger of erosion.

The silt fence should not be removed until adequate vegetative growth ensures no further erosion of the slopes. Generally, the fabric is cut at ground level, the wire and posts are removed, then the sediment is spread, seeded, and protected (mulched) immediately.

Control measure: Plastic sheets

Implementation: Soil stockpiles and other erodible materials should be covered by plastic as soon as they are generated. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Contractor should frequently check plastic to ensure soil or other erodible material is covered.

Control measure: Temporary construction access

Implementation: Temporary construction access will be installed at the beginning of construction and will provide access to and from the sites. Vehicle use will be restricted to designated construction entrances to minimize the tracking out of sediment. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Where sediment has been tracked-out from the site and onto the surface of off-site streets, other paved areas, and sidewalks, remove the deposited sediment by the end of the same work day in which the track-out occurs, or by the end of the next work day if track-out occurs on a non-work day. Remove the track-out by sweeping, shoveling, or vacuuming these surfaces, or by using other, similarly effective means of sediment removal.

Hosing or sweeping tracked-out sediment into any stormwater conveyance (unless it is connected to a sediment basin, sediment trap, or similarly effective control), storm drain inlet, or surface water is prohibited.

7.5 Minimize Dust

Dust control includes practices used to reduce or prevent the surface and air transport of dust during construction

Control measure: Application of water for dust control

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Implementation: During active construction as needed. Apply at a rate of 3 gallons per acre, using a diffused or sprinkled flow. Care should be taken not to saturate or muddy the dust and that dust generation does not increase. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Application of water for dust control requires constant attention.

Sprinkling will likely need to be done several times per day, especially during hot, dry weather.

7.6 Minimize Disturbance of Steep Slopes

Describe how disturbance of steep slopes will be minimized. Describe controls (e.g. tackifiers) that will be implemented to minimize sediment discharges from slope disturbances.

If applicable, describe how stormwater run-on and run-off will be managed. Flows may be diverted from exposed soils by retaining/detaining flows or otherwise minimizing runoff and the discharge of pollutants from exposed areas of the site. Placement of structural practices in floodplains will be avoided to the degree technologically and economically practicable and achievable.

Control measure: Straw Mulch

Implementation: During active construction, if used, and within 14 days of last disturbance. - -3 tons per acre. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Maintain thickness of cover. Any area showing signs of erosion shall be re-mulched, seeded.

7.7 Topsoil Conservation

Describe how topsoil will be preserved, if feasible. If conservation of topsoil is infeasible, explain why, and describe alternate methods to be used to insure optimum vegetation survival and growth.

Erosion and sediment control measures for topsoil stockpiles (and other erodible materials) are shown in section 4.4.

Contractor and PE Note: Fill in all incomplete information following contract award date and prior to start of construction

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Conservation of topsoil is Infeasible:

Reason: Click here to enter text.

Alternate method: Click here to enter text.

Conservation of topsoil is Feasible:

Measure: Click here to enter text.

Implementation: Click here to enter text.

Maintenance: Click here to enter text.

7.8 Minimize Soil Compaction

Minimize soil compaction in areas where final vegetative stabilization will occur and where infiltration practices will be installed.

Control measure: Distribute layer of soft vegetative top soil after compaction complete

Implementation: After soil compaction is complete and prior to revegetation efforts. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Maximize depth whenever possible and seed as soon as practicable.

If seeding cannot occur in a timely manner, other BMPs will be placed to mitigate erosion.

7.9 Storm Drain Inlets and Culvert Inlets

Applicable for stormwater drain inlets which are connected to separate storm sewer systems (usually in urban locations) AND for culvert inlets that discharge stormwater from the project into surface waters.

Locations and design specifications of BMPs are shown on the erosion and sediment control plan

The following BMPs are applicable to:

Storm Drain Inlets

Culvert Inlets

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7.10 Constructed Stormwater Conveyance Channels and Culvert Outlets

Describe velocity dissipation and/or erosion control devices to be installed at stormwater conveyance channels (such as roadside ditches) and culvert outlets. Includes permanent and temporary devices (specify).

Velocity dissipation devices will be placed at discharge locations and along the length of any outfall channel to provide a non-erosive flow velocity from the structure to a water course so that the natural physical and biological characteristics and functions are maintained and protected (e.g., no significant changes in the hydrological regime of the receiving water).

Locations and design specifications of BMPs are shown on the erosion and sediment control plan

Not applicable to this project.

Control measure: Check Dams

Implementation: Following ditch construction. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Regular inspections should be made to ensure that the center of the dam is lower than the edges. Sediment will be removed from check dams before deposits reach 50% of the above ground height. Check dams will not be removed until vegetation is satisfactorily established.

Control measure: Temporary drainage structure

Implementation: Immediately following the disturbance of the slope on which it rests and should not be removed until the disturbed slope has been permanently stabilized. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance: Inspected weekly and after every storm. Repairs are to be made immediately.

Inlets should be kept free of debris. Drains should remain securely fastened to the slope at all times.

Control measure: Riprap

Implementation: Outlet protection should be finalized before the drainage system becomes effective. Filter cloth should be placed between riprap and the underlying soil to prevent soil movement into and through the riprap. Please also refer to project schedule, contract, and plan set (Erosion Control section).

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Maintenance requirements: Loose rock should be replaced. Inspections should occur monthly and after each major rainfall event.

7.11 Sediment Basins

If applicable, provide site design specifications and other details for design of sediment basins and ponds. This may also include sediment infiltration swales.

Locations and design specifications of BMPs are shown on the erosion and sediment control plan sheets in TAB 6.

At a minimum, sediment ponds must provide storage for either the calculated volume of runoff from the 2-year, 24-hour storm event or 3,600 cubic feet per acre drained. Sediment ponds must also use outlet structures that withdraw water from the surface, unless infeasible.

If applicable, type of sediment retention/infiltration used: Click here to enter text.

Design description: Click here to enter text.

7.12 Chemical Treatment

If chemical sediment control (such as polymers) will be used, provide design specifications and other details considered when choosing treatment type and locations.

NOTE: If use of cationic treatment chemicals is planned, separate prior approval is required from EPA.

Locations of chemical treatment sites are shown on the erosion and sediment control plan sheets in TAB 6.

Describe/name treatment chemicals that will be used and why these chemicals are suited to site soil characteristics and other construction site conditions: Click here to enter text.

Describe treatment system specifications and dosage of chemicals to be used: Click here to enter text.

Describe storage of chemicals and other material safety data: Click here to enter text.

Special controls to be used for Cationic treatment chemicals: Click here to enter text.

Describe training that personnel handling/applying treatment chemicals have/will receive: Click here to enter text.

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7.13 Dewatering Practices

Discharge of ground water or accumulated stormwater that is removed from excavations, trenches, foundations, etc. into surface waters is prohibited unless such waters are first effectively managed by appropriate sediment controls. Uncontaminated non-turbid dewatering water can be discharge without being routed to a control.

Not applicable to this project

7.14 Erosion Control and Stabilization

Commence temporary soil stabilization measures immediately if no further disturbance of an area of the site or stockpile is expected within the next 14 days. Complete temporary soil stabilization measures to disturbed sites or stockpiles within 14 days of last disturbance. Provide for temporary stabilization of all exposed soil prior to winter construction shut down .

Specify whether stabilization measure is temporary or permanent.

Temporary Measures:

Practice/Control measure: Revegetation with contractor-approved seed mix

Implementation: In places where exposed soil surfaces are not to be fine-graded for periods longer than 30 days. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance: Frequent inspections until proper vegetative establishment has been made.

Practice/Control measure: Straw Mulch

Implementation: During active construction, if used, and within 14 days of last disturbance. - -3 tons per acre. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance requirements: Maintain thickness of cover. Any area showing signs of erosion shall be re-mulched.

Practice/Control measure: Tackifier

Implementation: During active construction and within 14 days of last disturbance. Please also refer to project schedule, contract, and plan set (Erosion Control section).

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Maintenance: Maintain thickness of cover. Any areas showing signs of rilling or other erosive circumstances will be retreated.

Permanent Measures:

Practice/Control measure: Revegetation with Park-approved seed mix

Implementation: In disturbed areas where permanent, long-lived vegetative cover is needed to stabilize the soil. Please also refer to project schedule, contract, and plan set (Erosion Control section).

Maintenance: Frequent inspections until proper vegetative establishment has been made.

7.15 Removal of BMPs

Remove erosion and sediment control BMPs that are no longer needed and leave in good working order those BMPs that will remain at the construction site after close-out.

BMPs are no longer needed when the site that the BMP is protecting has reached final stabilization as defined in the applicable NPDES Stormwater Permit.

Final stabilization means:

All ground disturbing activities at the site have been completed, AND

Vegetation has been established that provides a uniform perennial vegetative cover with a density of 70% of the natural vegetative cover prior to construction.

In arid (0- -stabilization is considered to be achieved when the area is seeded or planted and vegetation is expected to provide 70% cover within 3 years; AND, erosion controls are in place that provide soil protection for at least 3 years without active maintenance.

Document arid/semi-arid conditions in SWPPP

Effective non-vegetative stabilization is in-place such as rip rap, gabions, geotextiles, rock, aggregate etc.

7.16 Post Construction Measures

Responsibility for NPDES permit compliance after construction close-out will be the responsibility of:

FHWA/WFLHD

Land Management/Owner Agency Specify Agency: National Park Service

County/State DOT

Applicable permit termination/transfer information is located in TAB 18.

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Section 8: Operational Controls/Good Housekeeping Measures

8.1 Hazardous Spill Plan

Spills and potential stormwater contamination will be controlled to reduce the chance of spills, stop the source of spills, contain and clean up spills, and dispose of materials contaminated by spills.

Spill prevention and response actions are outlined in the Hazardous Spill Plan or Spill Prevention, Control, and Countermeasure Plan (SPCC) whichever is applicable, TAB 15.

Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and implementation of a Spill Prevention, Control and Countermeasure Plan if the facility is a non transportation-related facility that: has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity greater than 42,000 gallons and could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters of the United States and adjoining shorelines. See EPA website: http://www.epa.gov/OEM/content/spcc/index.htm

Implementation: Prior to construction activities and throughout construction.

8.2 Spills/Releases in Excess of Reportable Quantities

This permit does not provide authorization to discharge hazardous substances or oil resulting from an on-site spill. This permit does not provide relief from the federal reporting requirements of 40 CFR Part 110, 40 CFR Part 117 and 40 CFR Part 302 relating to spills or other releases of oils or hazardous substances.

For a release containing a hazardous substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Part 110, 40 CFR Part 117 or 40 CFR Part 302, occurs during a 24-hour period:

Notice will be provided to the National Response Center (800 424 8802) in accordance with the requirements of 40 CFR Part 110, 40 CFR Part 117 and 40 CFR Part 302 as soon as site staff have knowledge of the discharge; and written notice will be provided within 7 calendar days of knowledge of the release, provide a description of the release, the circumstances leading to the release, and the date of a release.

Measures to prevent the reoccurrence of such releases will be implemented.

8.3…