SWPPP_WA_RIDGE_MAIN(1)_Main_Avenue_Access_Improvements.pdf

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 FHW A/WFLHD Project Engineer (PE) is the duly authorized representative of the FHW A 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 FHW A PE.

1.6 Permitting Authority for FHW A/WFLHD Projects

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

The applicable EPA/State NPDES permit is located in TAB 2

Idaho and Washington, Environmental Protection Agency EPA Region 10

Alaska Department of Environmental Conservation (ADEC)

Montana Department of Environmental Quality (MDEQ)

Oregon Department of Environmental Quality (ODEQ)

Wyoming Department of Environmental Quality (WDEO)

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.

Idaho • EPA is permitting authority for discharges within the state .

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

• EPA is the permittin.g authority for Indian Country lands within the state .

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

• EPA is the permitting authority for Indian Country lands within the state .

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

• EPA is permitting authority for Federal Operators and Indian Country lands within the state

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

• EPA is the permitting authority for Indian Country lands within the state

The NOi for Alaska projects (through the ADEC) can be filed electronically at Alaska Pollutant Discharge Elimination System Program website. The completed SWPPP will be submitted to either ADEC or the Municipality based on the project type and operator described in the ADEC CGP.

(2]

The NOi for projects in Idaho, Washington, Denali NP and Metlakatla Indian Reservation can be filed electronically at The EPA website.

The NOi for Montana can be filed through MDEQ following guidance at this website.

Oregon DEQ authorizes FHW A/WFLHD projects under the programmatic 1200-CA permit, (expired in 12/31/2005, administratively extended)

The NOi for Wyoming can be filed electronically at this website.

[3]

2:

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 oflntent (NOI) after the SWPPP is complete.

Project Name:

Project Site Location:

City, County, State, Zip Code:

Main Avenue Access Improvements, WA RIDGE MAIN(l)

The Carty Unit is situated immediately north of the City of Ridgefield (City) along Main Avenue (Main) within Ridgefield's Urban Growth Boundary

Ridgefield, Clark County, WA, 98642

Latitude/Longitude (Using one of three possible formats) 1

Latitude: Longitude:

3. 45 .831286 ° N (decimal) 3. -122.746683 ° W (decimal)

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

Township: 4N

Range: IW

Section: 13

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?

1 Detailed information on determining the site's latitude and longitude can be found at:

www.epa.gov/npdes/stormwater/latlong

[4]

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: Golden Paintbrush, Castilleja levisecta and Water Howellia Howellia aquatilis. Sensitive areas: Freshwater emergent wetlands on the West side of Lake River. Riverine wetlands exist along Lake River. Highly erodible soils:

Sauvie silt loam.

Also, see TAB 6

Stormwater currently drains from the site in the following manner, Towards Lake River, local streams, and wetlands from both sides of the proposed project.

Also, see TAB 6

The location of discharge points or areas

Lake River and Gee 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: The channel gradient both upstream and downstream of the proposed project is around one percent.

Soil type(s) of highly erodible soils and the soils' infiltration capacity are identified as,2

Summary by Map Unit - Clark County, Washington (W AO 11)

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

HoC Hillsboro silt loam, 8 to 15 percent slopes .37 0.0 0.1%

HoG Hillsboro silt loam, 30 to 65 percent slopes .37 0.3 3.4%

2 Access the Natural Resources Conservation Service Web Soil Survev.

[5]

SmB Sauvie silt loam, 3 to 8 percent slopes .43

SpB Sauvie silty clay loam, 0 to 8 percent slopes .37 w Water

Totals for Area of Interest

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

[6]

2.3 22.2%

3.8 36.7%

3.9 37.6%

10.4 100.0%

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

Also see TAB 6

Protected Natural Features:

Golden Paintbrush, Castilleja levisecta and Water Howellia Howellia aquatilis.

Sensitive areas: Freshwater emergent wetlands on the West side of Lake River.

Riverine wetlands exist along Lake River.

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 Site: 52.24 inches

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

2.0 Inches per day

The 10-year, 24-hour storm event:

3.0 Inches per day

The 25-year, 24-hour storm event:

3.5 Inches per day

3 Precipitation frequency for Western States

[7]

3:

3.1 General Description of Project and Scope of Work:

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

Pedestrian sidewalk construction: This project will construct approximately 2,200 feet of missing sidewalk, addressing safety issues by moving pedestrians from the vehicle travel lane to a dedicated, separate sidewalk/trail. This work will include:

• Construction of approximately 0.40 miles of attached and detached 6 to 10 foot wide paved sidewalk from end of existing sidewalk near Ridgefield city limits to the northern end of the refuge frontage near NE 291st Street.

• Significant excavation of embankments to the north and extensive fill along the south portion of the proposed sidewalk, together totaling approximately 11,300 cubic yards of material.

• A new bridge approximately 100 feet long, will replace the existing undersized culvert on Main Avenue, reducing flooding risk to public and private lands ,and removing a current barrier to fish passage.

• Re-routing of a residential driveway near the bridge, from angled to perpendicular access onto Main Avenue to improve sight distance and facilitate construction of the bridge.

The type or function of the project is: Other transportation-related

[8]

Contractor and PE

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

TBD by contractor

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 107.0lA(h)).

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

Size of the Construction Project:

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

Estimated Area

Totalp~oject area( within ROW or Construction limits):

Construction site area to be disturbed:

Percent Impervious Area BEFORE Construction: 18 %

Runoff Coefficient BEFORE Construction: 85

Percent Impervious Are AFTER Construction:

Runoff Coefficient AFTER Construction:

[9]

29 %

Units.

3.

Se qu en ce a nd

E st im at ed D at es o f C on st ru ct io n

A ct iv it ie s

T he i nt en de d co ns tr uc ti on s eq ue nc in g an d ti m in g o f m aj or c on st ru ct io n ac ti vi ti es is d et ai le d he re in cl ud in g th e ph as ed g ra di ng a nd s ta bi li za ti on ac ti vi ti es u se d to m in im iz e ov er al l am ou nt o f d is tu rb ed s oi l.

C on tr ac to r an d

P E

N ot e:

F il l in a ll i nc om pl et e in fo rm at io n fo ll ow in g co nt ra ct a w ar d da te a nd p ri or to s ta rt o f c on st ru ct io n

P ha se

C on st ru ct io n se gu en ce d es cr i~ ti on

D ur at io n of se gu en ce

B M

P s as so ci at ed w it h th is s eg ue nc e:

St ab ili za ti on m ea su re s:

C lic k he re to e nt er t ex t.

li ck h er e to e nt er te xt

C lic k he re t o en te r te xt

C lic k he re to e nt er t ex t.

P ha se

C on st ru ct io n se gu en ce d es cr i~ ti on

D ur at io n of se gu en ce

B M

P s as so ci at ed w it h th is s eg ue ili za ti on m ea su ck h er e to e n k r te xt

C lic k he re t o en te r te xt

C lic k he re t o en te r te xt

C lic k he re to e nt er t ex t.

P ha se

C on st ru ct io n se gu en ce d es cr i~ ti on

D ur at io n of se gu en ce

B

M P s as so ci at ed w it h th is s eg ue ili za ti on m ea su ck h er e to e nt er t ck h er e to e nt er t ex t.

C lic k he re to e nt er te xt

C li ck h er e to e nt er t

[1 0]

P ha se

C on st ru ct io n se gu en ce d es cr iu ti on

D ur at io n of se gu en ce

B

M P s as so ci at ed w it h th is s eg ue il iz at io n m ea su ck h er e to e nt er t ex t.

C li ck h er e to e nt er te xt

C li ck h er e to e nt er t ex t.

C li ck h er e to e nt er te xt

[I I] g 0 ·;;:

"O r/l

1'81 1'81 l8J l8J l8J l8J l8J l8J

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 storm water discharges from the construction site.

Potential Construction Site Pollutants

Construction Activity "' ..

..... ... "' !l ... ... c c ..

" <;(! "O ... ·;: "' e ...

~ :5 ~ <;(! .:::: ·-"' ... :s "' .. .c "' ... = .. = 0 r/l z i:;Q Q, r..Q Q., Clearing, excavating, and grading x x Fill of roadway embankment, backfill at structures x x Vehicle/equipment fueling and maintenance x x Vehicle/equipment use and storage 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 Demolition and debris disposal x x x Solid waste (trash and debris) x Hazardous waste or contaminated spills x Paving operations x x Landscaping operations x x x Mining, rock extraction, crushing x x x

Note: Contractor and PE - fill in any additional details as they become available/necessary

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

Material

TBD by contractor

[12]

Storage Location x x

!l c .. ........ ... = .:::: = ..... 0 o=...

x x x x x x

4:

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

[13]

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

I.None

2.

3.

Stormwater Discharge Location

5.1 Allowable Non-Stormwater Discharges

Multi-Sector General Permit Number (if applicable)

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)

!81

• !81

• D

• D

• !81

• D

• !81

• D

• !81

• D

• D

Potential Non-Stormwater Discharges

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

[14]

Control Measures

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

TAB6

5.2 Receiving Waters:

Are there any surface waters located within 50 feet of the construction disturbance? Choose an item.

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

Impaired Waters/TDMLs:

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

1.

2.

Yes D No IZI

What pollutant(s) is causing the impairment?

Yes IZI No D Temperature, Bacteria, and Dissolved Oxygen.

YesD NoD

YesD NoD

YesD

Yes D No IZ!

YesD NoD

YesD NoD

Pollutant(s) for which there is a TDML

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

WA 303 (d) list

Tier 2, 2.5 or 3 Waters Answer the following for each surface water listed in Table 1:

Is this surface If yes, specify which Tier.

water designated as Tier 1,2 or 3?

1. Yes D No IZ! Choose an item.

2. Yes!Z! No D Tier 2

3. YesD NoD Choose an item. i

4. YesD NoD Choose an item. --~-J

[15]

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 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.

[16]

6.1 Endangered Species Protection

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

DA DB De Dn ~E

Criterion A.

Criterion B.

Criterion C

Criterion D.

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.

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 ofNPDES 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 Critedon C, you must provide EPA with the relevant supporting information required of existing dischargers in Criterion C in the EPA NOI form. ·

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

NOL

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

[17]

Criterion E.

Criterion F.

correspondence between yourself and the Services in your SWPPP and

NOL

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 NOL

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 NOL

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? No

D Dike

D Berm

D Catch Basin

D Pond

D Ditch, trench, swale, perimeter drain, etc.

D Culvert

D 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)? Choose an item.

Provide documentation for the basis of this determination. Click here to enter text.

[18]

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? Choose an item:

Provide documentation for the basis of this determination. Click here to enter text.

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 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:

D 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)

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

D 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.

[19)

7:

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. A void 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 storm water.

• 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)

This section only applies if a surface water is located within 50 feet of the project's earth 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:

D 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.

[20]

D 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: 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.

D The project qualifies for one of the exceptions in EPA CGP Part 2.1.2.1.e

D For a "linear project", 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.

D 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.

[21]

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:

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.

Maintenance requirements: Silt fences should be inspected periodically for damage (such as tearing by wind, animals, or equipment) and for the amount of 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, the 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: Fiber Roll

Implementation: The fiber rolls shall be functional before other land disturbing activities take place. Fiber rolls 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.

Maintenance requirements: Remove sediment before it has accumulated to one half of the above ground height of the straw wattles. 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.

Add other measures as needed.

[22]

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 sheets in TAB 6.

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

If applicable:

Control measure: Stabilized Construction Exit

Implementation: Construction exits shall be stabilized wherever traffic will be leaving a construction site and traveling on paved roads or other paved areas within 1,000 feet of the site ..

Maintenance requirements: Any sediment that is tracked onto pavement shall be removed by shoveling or sweeping. The sediment collected by sweeping shall be rep:ioved 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.

Control measure: Washing without detergents or solvents within perimeter

Implementation: If used, during active construction as necessary

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

Add other measures as needed.

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.

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

If applicable:

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.

[23]

Maintenance requirements: Silt fences should be inspected periodically for damage (such as tearing by wind, animals, or equipment) and for the amount of 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, the 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: See attached SCR 157 and Erosion control plan sheets.

Implementation: During active construction, if used.

Maintenance requirements: Periodic inspections in accordance with CGP to ensure there is no overtopping, rilling, or other erosive conditions

Control measure: Plastic sheets

Implementation: All the soil stockpiles or other erodible materials should be covered by plastic all the time.

Maintenance requirements: Contractor should check the plastic cover frequently to make sure the soil or other erodible material is covered all the time.

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.

Maintenance requirements: Where sediment has been tracked-out from the site 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.

[24]

7.5 Minimize Dust

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

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

If applicable:

Control measure: Application of water for dust control

Implementation: During active construction as needed

Maintenance requirements: Water used for dust control requires constant attention. In periods of hot or dry weather, several applications a day may be required.

Control measure: Sprinkling

Implementation: Apply at a rate of 3 gallons per acre so that the soil is wet but not saturated or muddy and so that no dust is being generated.

Maintenance requirements: Dust control requires constant attention: it is not a one-time or once in- awhile activity. Dust control sprinkling may have to be done several times a day during hot, dry weather.

Add other measures as needed.

7.6 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 .

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

If applicable:

Control measure: Click here to enter text.

[25]

Implementation: Click here to enter text.

Maintenance requirements: Click here to enter text.

Control measure: Click here to enter text.

Implementation: Click here to enter text.

Maintenance requirements: Click here to enter text.

Control measure: Click here to enter text.

Implementation: Click here to enter text.

Maintenance requirements: Click here to enter text.

[26]

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

D Conservation of topsoil is Infeasible:

Reason: Click here to enter text.

Alternate method: Click here to enter text.

D Conservation of topsoil is Feasible:

Conservation measure: Click here to enter text.

Implementation: Click here to enter text.

Maintenance requirements: Click here to enter text.

Conservation measure: Click here to enter text.

Implementation: Click here to enter text.

Maintenance requirements: Click here to enter text.

Add other measures as needed.

7.8 Minimize Soil Compaction

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

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

If applicable:

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

Implementation: After soil compaction is complete and prior to revegetation efforts

Maintenance requirements: 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.

Implementation: After soil compaction is complete and prior to revegetation efforts

[27]

Maintenance requirements: 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 Control measure: Distribute layer of soft vegetative top soil after compaction complete placed to mitigate erosion.

Add other measures as needed.

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 sheets in TAB 6.

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

If applicable:

The following BMPs are applicable to:

D Storm Drain Inlets

~ Culvert Inlets

Control measure: All existing culverts must be protected in place to maintain full functionality of existing drainage patterns. Storm 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 perimeter silt fence to intercept construction stormwater before discharging to receiving waterbody.

Maintenance requirements: Clean, or remove and replace, the protection measures as sediment accumulates, the filter fabric becomes clogged, and/or 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 ifremoval by the same work day is not feasible

Control measure: Drainage structures in areas where no work occurs will remain and will be protected. To prevent discharge of turbid water downstream, all existing catch basins located within the disturbance area will be protected with storm drain inlet protection. Proposed inlets will also be protected with catch basin inserts, and where feasible, their outlets will be

[28] temporarily plugged until the site is stabilized. The Contractor shall remove inlet protection at the end of the project without releasing captured sediment into the storm system.

Implementation: The inlet structures should be protected during construction to not allow sediment plug.

Maintenance requirements: Clean, or remove and replace, the protection measures as sediment accumulates, the filter becomes clogged, and/or performance is compromised. Where there is evidence of sediment accumulation adjacent to the inlet protection measure, 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.

Add other measures as needed.

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 sheets in TAB 6.

D Not applicable to this project.

If applicable:

Control measure: Fiber roll check dams

Implementation: Following ditch construction.

Maintenance requirements: 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: rip rap culvert outlets

Implementation: immediately after culvert installation

Maintenance requirements: regular maintenance by BLM after project

[29]

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.

IZI 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.

7.12 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.

IZI Not applicable to this project.

If applicable:

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.

Des<;ribe/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.

7.13 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.

IZI Not applicable to this project

[30]

If applicable:

Specific dewatering practice: Click here to enter text.

Implementation: Click here to enter text.

Maintenance: Click here to enter text.

Add other measures as needed.

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: Following sediment & erosion control measures will be used to maintain site stabilization during construction; Silt Fence, Straw wattles, stabilized construction entrance, Compost berm for sediment pond, Plastic Sheets & Plywood for stockpiles.

Implementation: TBD

Maintenance: Standard operation and maintenance per WFL standard drawings and· specifications.

Add other measures as ·needed.

[31]

~ Permanent Measures:

Practice/Control measure: Revegetation with state approved seed mix

Implementation: In accordance with schedule

Maintenance: Periodic inspections will be done to review for and confirm final stabilization

Practice/Control measure: Restoration of all disturbed areas through seeding with native grasses.

Add other measures as needed.

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 (0-1 O" 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.

7.16 Post Construction Measures

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

1:81 FHW A/WFLHD

0 Land Management/Owner Agency Specify Agency: Choose an item.

0 County/State DOT

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

[32] res

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, ='·

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 EquipmentNehicle 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 :2).

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 (T 6).

[33]

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.

Implementation: Prior to construction activities and throughout construction.

8.4 EquipmentNehicle Washing

Equip…