dena01048_SWPPP.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: NPDES Permit (Construction General Permit)

TAB 3: NOI, EPA 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: NPDES Notice of Termination (NOT)

Tab 1 - SWPPP Narrative

Revise and update as needed per SCR 107 and SCR 157

Stormwater Pollution Prevention Plan (SWPPP)

For Construction Activities at:

Project Name: CULVERT REPLACEMENT MP 52 & ROCKFALL

MITIGATION MP 52.9, AK NPS DENA 10(48)

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: Denise Steele, Environmental Protection Specialist

Company/Organization: FHWA, Western Federal Lands Highway Division

Address:

610 East Fifth Street

Telephone Number: Vancouver, WA 98661-3801

SWPPP Preparation Date: 2/2/2021

Estimated Construction Start Date: 5-14-2021

Estimated Construction Completion Date: 9-10-2021

Estimated Revegetation Start Date: 7-31-2021

Estimated Revegetation Completion Date: 6-10-2022

SWPPP TABs (SWPPP Inclusions)

TAB 1: SWPPP 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: Vicinity 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 (Section 7) and

Historic Preservation (Section 106) Documentation

TAB 17: NPDES Quality Assurance Checklist

TAB 18: NPDES Notice of Termination (NOT)

TAB 1:

SWPPP NARRATIVE

[i]

Table of Contents

SECTION 1: RESPONSIBLE PARTIES/CONTACT INFORMATION

1.1 Permittee(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 Perimeter Controls

7.2 Sediment Track-Out

7.3 Stockpiled Soil or Other Erodible Materials

7.4 Minimize Dust

7.5 Minimize Disturbance of Steep Slopes

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7.6 Topsoil Conservation

7.7 Minimize Soil Compaction

7.8 Storm Drain Inlets and Culvert Inlets

7.9 Constructed Stormwater Conveyance Channels and Culvert Outlets

7.10 Sediment Basins

7.11 Chemical Treatment

7.12 Dewatering Practices

7.13 Erosion Control and Stabilization

7.14 Removal of BMPs

7.15 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

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Section 1: Responsible Parties/Contact Information

1.1 Permittee(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

Telephone Number:

Contractor and PE

Organization Name:

Name:

*Placeholder, to be filled if/after transferring permit coverage

1.2 Construction Site SWPPP Contact(s):

FHWA Contact Name:

Title:

TBD

Project Engineer

General Contractor

Company:

Erosion Control

Supervisor Name:

*Placeholder, to be filled if/after permit coverage is transferred

Organization Name

Contact Name:

Title:

Project Engineer

[2]

1.3 SWPPP Prepared by:

Organization/Company: WFL/FHWA

Name, Position: Denise Steele, Environmental Protection Specialist

Role/Responsibility FHWA, Western Federal Lands Highway Division

Telephone Number: 610 East Fifth Street

Email: Vancouver, WA 98661-3801

Date/Name of Course

Provider (MT Only)

360-619-7593

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 General

Contractor’s ECS and 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/State NPDES permit is located in TAB 2

State Permitting Authority

Alaska

• ADEC is permitting authority for most discharges within the state EXCEPT for:

• EPA is the permitting authority for the Denali National Park and Preserve and Metlakatla

Indian Reservation.

The NOI for projects in Idaho, Washington, Denali NP and Metlakatla Indian Reservation can be filed electronically at The EPA 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: CULVERT REPLACEMENT MP 52 & ROCKFALL

MITIGATION MP 52.9, AK NPS DENA 10(48)

Project Site Location: Denali National Park

City, County, State, Zip Code: Healy, Denali Borough, Alaska, 99743

Latitude/Longitude:

63.515417, -149.996111 (decimal degrees)

The method used for determining latitude/longitude was: Google Earth Pro

Township: Range: Section:

16S 13W 24

Is the project located in a American Indian or Alaskan Native area? No

If yes, the name of Reservation is:

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:

Stormwater currently drains from the site in the following manner:

Sheet flow from asphalt road surface into roadside ditches.

Also, see TAB 6

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The location of discharge points or areas:

Along Denali Park Road into the Toklat River, Bugstuffer Creek, Stony Creek.

Also see TAB 6

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: Rockfall slope at MP 52.9.

Soil type(s) of highly erodible soils and the soil infiltration capacity are identified as:1

No erodiblity or infiltration rating on USDA Web Soil Survey site.

Any past soil contamination at the site is identified as:

None

Protected Natural Features (natural features include trees, streams, wetlands, slopes, etc.):

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).

There are streams and rivers located within the project area as noted above. The project area also contains unstable slopes and this project includes rockfall mitigation activities.

Also see TAB 6

Measures to protect these features:

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

Rainfall:

(AK Only)

10-year Mean Annual Precipitation at the Project Site (inches):2 14.69

1 NRCS Web Soil Survey.

2 NRCS Annual Climate Data http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx https://www.wcc.nrcs.usda.gov/climate/navigate_wets.html

[5]

Frequency, intensity, and duration of rainfall for the project site:

(principal factors influencing erosion from a construction site)

The 2-year, 24-hour storm event:3

1.48 inches/day

The 10-year, 24-hour storm event:

2.27 inches/day

The 25-year, 24-hour storm event:

2.76 inches/day

(Alaska Projects Only – delete if not applicable)

Approximate Growing Season at the Project Site:45 5/10-9/18

3 Precipitation frequency for Western States 4 Determine USDA Gardening Zone 5 Zone Growing Season Dates http://www.wrcc.dri.edu/Climate/precip_freq_maps.php https://planthardiness.ars.usda.gov/phzmweb/interactivemap.aspx https://www.ufseeds.com/learning/planting-schedules/

[6]

Section 3: Nature of Construction Activity

3.1 General Description of Project and Scope of Work:

(i.e., highway construction, realignment, highway and bridge reconstruction, etc.):

Repair work at three bridges (including scour protection), excavation, drainage, aggregate, rock scaling, and concrete replacement.

The type or function of the project is: Road Construction

Construction Support Activities: 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

Toklat Pit.

NOTE: All Contractor-selected sources and support sites are the sole responsibility of the

General Contractor. The SWPPP and NPDES permitting for Contractor-selected sites and sources are separate from this documentation (SCR 107.01A(h)).

Support activities are located on the general vicinity map and/or site map in TAB 5 and TAB 6.

Size of Project Action Area:

(Including all Government-selected support sites such as staging, borrow, waste, access roads, affected downstream area, noise perimeter, extent of light effects, etc.)

Estimated Area Units

Total project area (within outermost project boundary): 1.97 acres

Disturbed project area (area of digging within total project area): 1.19 acres

Percent Impervious Project Area BEFORE Construction: 52 %

Runoff Coefficient BEFORE Construction: 0.29 %

Percent Impervious Project Area AFTER Construction: 52 %

Runoff Coefficient AFTER Construction: 0.29 %

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3.2 Sequence and Estimated Dates of Construction Activities

The intended construction sequencing and timing of major construction activities is detailed here, including the phased grading and stabilization activities used to minimize overall amount of disturbed soil.

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

Phase:

Construction sequence description: Duration of sequence:

BMPs associated with this sequence:

Stabilization measures:

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BMPs associated with this sequence:

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BMPs associated with this sequence:

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BMPs associated with this sequence:

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BMPs associated with this sequence:

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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.

S e le c te d A c ti v it y

X

Construction Activity

Potential Construction Site Pollutants

S e d im e n t

N u tr ie n ts

B a c te ri a p H

O il

G r ea se

T ra sh

D b r is

P st ic id e s

H ea v y

M e ta ls

O th r

P o ll u 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

☒ 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:

Contractor and PE

Indicate locations of stockpiles on vicinity map if outside of previously discussed stockpile locations

Material Storage Location

Aggregate Toklat Pit

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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

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

To be completed by contractor

Waters used to wash vehicles where detergents are not used

Water used to control dust Do not overwater.

Potable water including uncontaminated water line flushings

Construction dewatering (uncontaminated)

Ground water or spring water (uncontaminated) Monitor to ensure sediment laden water does not reach a water body.

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 Monitor to ensure sediment laden water does not reach a water body.

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

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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

1. Toklat River

2. Bugstuffer Creek

3. Stony Creek

4. Sanctuary River, On bridge surface work only.

Impaired Waters/TDMLs:

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

Is this surface water listed as

“impaired?”

What pollutant(s) is causing the impairment?

Has a TMDL been completed?

Pollutant(s) for which there is a

TDML

1. Yes No Sediment Yes No

2. Yes No Sediment Yes No

3. Yes No Sediment Yes No

4. Yes No Sediment Yes No

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

https://dec.alaska.gov/water/water-quality/impaired-waters/

EPA Waterbody Quality Assessment 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 2, 2.5, or 3?

If yes, specify which Tier.

1. Yes No Choose an item.

2. Yes No Choose an item.

3. Yes No Choose an item.

4. 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 https://dec.alaska.gov/water/water-quality/impaired-waters/

[13] 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 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.

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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 F

Criterion A. No federally-listed threatened or endangered species or their designated critical habitat(s) are likely to occur in your site’s “action area” as defined in Appendix A of EPA permit.

Criterion B. The construction site’s discharges and discharge-related activities were already addressed in another operator’s valid certification of eligibility for 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 located in the “action area”. To certify your eligibility under this Criterion, there must be no lapse of NPDES permit coverage in the other operator’s 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 the other operator’s notification of authorization under this permit. If your certification is based on another operator’s 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 critical habitat(s) are likely to occur in or near your site’s “action area,” and your site’s discharges and discharge-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 listed species and/or designated habitat located in your “action area”; and

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 have addressed the effects of your site’s discharges and 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(s) that your site’s discharges and discharge-related activities are not likely to adversely affect listed species or critical habitat. You must include copies of the

[15] 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 the effects of the construction site’s discharges and 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 account the effects of your site’s discharges and discharge-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 the site’s discharges and discharge-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 effects of the site’s discharges and discharge-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

Catch Basin

Pond

Ditch, trench, swale, perimeter drain, etc.

Culvert

Other ground-disturbing stormwater control Removing Pipe Culvert

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

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Provide documentation for the basis of this determination. NPS and SHPO consultation: SHPO

January 10, 2020 concurrence of No Historic Properties Adversely Effected.

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? Yes

Provide documentation for the basis of this determination. NPS and SHPO consultation: SHPO

January 10, 2020 concurrence of No Historic Properties Adversely Effected.

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. No Historic Properties Adversely Affected

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.

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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 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:

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 above ground height. It is the Contractor’s responsibility to upgrade 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.

Note: Add additional measures used during construction.

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7.2 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).

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.

7.3 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 above ground height. It is the Contractor’s responsibility to upgrade 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: 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).

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

7.4 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

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.

7.5 Minimize Disturbance of Steep Slopes

Describe how disturbance of steep slopes will be minimized. Describe controls (e.g. erosion control blankets, 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.

☒ Not applicable to this project. Reason: steep slopes aren’t included at the toklat or stony locations.

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7.6 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

☐ 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.

7.7 Minimize Soil Compaction

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

Measure: Distribute layer of soft vegetative top soil after compaction complete

Implementation: After compaction is complete and prior to revegetation efforts

Maintenance: Maximize depth whenever possible and seed as soon as practicable. If seeding cannot occur in a timely manner, other BMPs (nets, blankets, etc.) will be placed to mitigate erosion

7.8 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.

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

Contractor and PE

The following BMPs are applicable to:

☐ Storm Drain Inlets

☒ Culvert Inlets

Measure: All existing culverts must be protected in place to maintain full functionality of existing drainage patterns. Strom water runoff from construction site must be passed through sediment control BMPs as indicated on erosion control plans, standard details, and compliant with NPDES-CGP permit

Implementation: Install fiber rolls to intercept construction before discharging to receiving waterbody.

Maintenance: Clean, or remove and replace, the protection measures as sediment accumulates, the filter fabric becomes clogged or otherwise performance is compromised. Where there is evidence of sediment accumulation adjacent to the protection measure, Contractor must remove the deposited sediment by the end of the same work day in which it is found or by the end of the following work day if removal by the same work day is not feasible.

7.9 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.

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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).

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

7.10 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.

Note: Add additional measures used during construction

☒ Not applicable to this project.

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

Design description: Click here to enter text.

7.11 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.

Contractor and PE

☒ Not applicable to this project.

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

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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.

7.12 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.

Contractor and PE

☒ Not applicable to this project

Measure: Click here to enter text.

Implementation: Click here to enter text.

Maintenance: Click here to enter text.

7.13 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 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).

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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. 2”-

3” thick; 5 bales per 1000 square feet or 2-3 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 and/or protected by a blanket or net.

☒ Permanent Measures:

Practice/Control measure: Revegetation with 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.

7.14 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 (0-10” annual precipitation) or semiarid (10-20” annual precipitation) areas, final 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.

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7.15 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 Equipment/Vehicle Fueling and Maintenance Practices

On-site fueling areas will have a spill kit present, visible, and maintained. Employees and subcontractors will receive training regarding equipment/vehicle fueling and maintenance practices, including proper fueling procedures, proper use of pumps, emergency shutoff valves

(training efforts documented in TAB 12).

On-site vehicles and equipment will be inspected daily for leaks, equipment damage, and other service problems.

Designate vehicle/equipment service will be marked and the areas will be located away from drainage facilities and watercourses to prevent stormwater run-on and runoff. Designated washout areas will be shown on the SWPPP plan sheets (TAB 6).

http://www.epa.gov/emergencies/content/spcc/index.htm http://www.epa.gov/OEM/content/spcc/index.htm

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Drip pans, drip cloths, or absorbent pads will be used when replacing spent fluids. All spent fluids will be collected and store in appropriate labeled containers in the proper storage areas.

8.4 Equipment/Vehicle Washing

Equipment/vehicle washing and allowable non-stormwater will be controlled using procedures and practices include using off-site facilities; washing in designated, contained areas only;

eliminating discharges to the storm drain by infiltrating the wash water or routing to the sanitary sewer. The locations of equipment/vehicle washing areas, storm drains, tributary drainage areas, and surface waterbodies on or near the site are shown and updated on the SWPPP plan sheets

(TAB 6).

Implementation: Prior to construction activities and throughout construction.

8.5 Material Handling and Waste Management

Measures will be put in place and maintained to prevent the discharge of solid materials to receiving waters, except as authorized by a permit issued under the §404 permit.

• Designated trash and bulk waste-collection areas on-site (location of areas are shown and updated on plan sheets, TAB 6).

• Litter and debris from the construction will be cleaned up on a daily basis.

• Waste-collection areas will be located away from streets, gutters, watercourses, and storm drains. Secondary containment around waste collection areas will be implemented if needed to further minimize the likelihood of contaminated discharges.

• Portable restrooms will be located away from streets, gutters, watercourses, and storm drains (location of areas are shown and updated on plan sheets, TAB 6). Secondary containment around waste collection areas will be implemented if needed to further minimize the likelihood of contaminated discharges.

• Portable restrooms will have tie-downs or stake downs in areas of high winds or susceptibility to vandalism.

• Hazardous waste-collection areas will be designated on-site (location of areas are shown and updated on plan sheets, TAB 6). Secondary containment around waste collection areas will be implemented if needed to further minimize the likelihood of contaminated discharges.

• Hazardous waste containers will be routinely inspected to ensure that all containers are labeled properly and that no leaks are present.

Implementation: Throughout construction.

8.6 Designate Concrete Washout Areas

Concrete washout areas on-site, designate specific washout areas, and design facilities to handle anticipated washout water will be installed. Washout areas will also be provided for paint and stucco operations as applicable. Washout areas will be located at least 50 yards away from storm

[28] drains and watercourses. If this is not possible, prefabricated washout containers will be used.

Alternatively, constructed washout areas may be used either by digging a pit and lining it with 10 mil plastic sheeting or creating an aboveground structure from straw bales or sandbags with a plastic liner. Designate washout areas will be shown on the SWPP plan sheets (TAB 6).

☐ Not applicable to this project

The following precautions will be implemented:

• Concrete trucks or equipment will not be washed out into storm drains, streets, gutters, uncontained areas, or any watercourses.

• Washout areas will be established prior to commencing the activity and their locations advertise with signs or delineators.

• Adequate containment for the amount of wash water that will be used will be provided.

• Washout structures will be routinely inspected to detect leaks or tears and to identify when materials need to be removed.

• Materials will be disposed of properly (for example, allow the water to evaporate and to recycle the hardened concrete).

• Inspections will include looking for evidence that contractors are using the washout areas and not dumping materials onto the ground or into drainage facilities. If the washout areas are not being used regularly, additional signage will be posted or the facility will be relocated to a more convenient location.

• Employees and subcontractors will receive training regarding designated washout areas, including proper handling and storage practices (training efforts documented in TAB 12).

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Section 9: INSPECTIONS

9.1 Inspection Frequency

Inspections will be conducted in accordance with one of the two schedules:

Contractor

Note: Indicate schedule to be used for the project

☐ At least once every 7 calendar days.

At least once every 14 calendar days and within 24 hours of the end of a storm event of 0.25 inches or greater, as determined by an on-site rain gauge.

Inspection frequency may be reduced to at least once every month if:

• The entire site is temporarily stabilized,

• Runoff is unlikely due to winter conditions (e.g., site is covered with snow, ice, or the ground is frozen), or

• Construction is occurring during seasonal arid periods in arid areas and semi-arid areas.6

A waiver of the inspection requirements is available, as authorized by the NPDES

STORMWATER PERMIT, until one month before thawing conditions are expected to result…