B08_Solit_SCBL_152851_Attach_05_Permit_Discussion.pdf

Scottsbluff National Monument

Visitor Center

Nebraska

Permit Discussion

March 29, 2017

Storm Water Discharges from Construction Sites

Nebraska Department of Environmental Quality Construction Stormwater Permit:

The area disturbance per the CD submittal is 0.45 acres, but if scope is increased to 1.0 acre or more then a Nebraska Department of Environmental Quality (NDEQ) Construction Stormwater (CSW) Permit will be required. A Storm Water Pollution Prevention Plan (SWPPP) must be prepared prior to construction and before a Notice of Intent (NOI) application is submitted to discharge under Nebraska’s general permit (NER110000) (attached). NOI applications must be submitted at least a week before construction, recommended 30 days prior, however, 7 calendar days after submission of a NOI the contractor may begin permitted construction. The NOI application is an online process with no associated fees.

NPS Under-an-acre Pollution Prevention Plan:

If disturbed area stays under an acre then in accordance with National Park Service (NPS) sustainability goals, a NPS Under-an-acre Pollution Prevention Plan (UPPP) will be completed. A completed UPPP has been completed using the NPS template (attached). The contractor is required to submit a completed

UPPP to NPS prior to construction for approval.

Fire Protection Line

General water line installation requirements

The new fire protection line to the visitor center is provided by NPS’s distribution system and does not appear the need for permitting. It is our understanding that NPS owns and operates the distribution system and no other jurisdictional coordination is required for new water taps. Coordination during the schematic design phase with the local fire chief indicated that the current water storage capacity appears sufficient. Contractor will be required to perform and submit to NPS super chlorination and coliform bacteria tests (Bac-T) for the new line per our specifications.

Nebraska Department of Environmental Quality Hydrostatic Testing Discharges

Depending on the means and methods of hydrostatic testing, the contractor will be required to apply for coverage under NDEQ hydrostatic testing discharges general permit (NEG72000) if the contractor discharges the water on the land or stormwater. The steps to obtain the permit is to submit a Notice of

Intent (HST-NOI) application under NDEQ NEG672000 (attached). Authorization will automatically be received 10 calendar days after the post-marked date of a complete, accurate and timely submittal to

NDEQ. No associated fees with permitting, but sampling of water is required to meet effluent limitations for total residual chlorine, dissolved iron, total suspended solids, metals, and pH.

Attachments

• NPS UPPP

• NDEQ NEG672000 HST-NOI Application

Under-an-Acre Pollution Prevention Plan (UPPP) – SCBL PMIS#152851 page 1 of 12

National Park Service – Denver Service Center

UNDER-AN-ACRE

POLLUTION PREVENTION PLAN

(UPPP)

Visitor Center Rehabilitation & Expansion PMIS No. 152851

Scotts Bluff National Monument

Nebraska

1443CX2000

UPPP Prepared by:

Martin/Martin, Inc.

12499 West Colfax Avenue

Lakewood, Colorado 80215

303.431.4028

Name and Title of Preparer:

Daniel Stewart, Engineer II

UPPP Preparation Date:

March 20, 2017

Under-an-Acre Pollution Prevention Plan (UPPP) – SCBL PMIS#152851 page 2 of 12

Table of Contents

1 General Information

1.1 Responsible Parties

1.2 UPPP Amendments

1.3 Project Scope

1.4 Standards and Constraints

1.5 Spill Prevention

2 Project Details that Relate to the UPPP

2.1 Project Scheduling

2.2 Site Information

2.2.1 Known Data on Soil and Fill

2.2.1.1 Soil

2.2.1.2 Fill

2.3 Construction Information

2.3.1 Activities with the Potential to Generate Non-Storm Water Pollution

2.3.2 Activities and Materials with the Potential to Pollute Storm Water

2.3.3 Activities with the Potential to Generate Sediment

3 Temporary Best Management Practices (BMPs) for Project

3.1 Management and Reporting

3.2 Waste Management

3.3 Non-Storm Water Pollution Control

3.4 Erosion Control - Soil Stabilization

3.5 Sediment Control

3.6 Other Pollution Control

4 Permanent Pollution Control Practices

5 References

6 Appendices

Appendix A: Contact Information

Appendix B: Pollution Prevention Control Maps or Sheet(s)

Appendix C: Standard Installation Specifications for each BMP

Appendix D: Blank Forms

7 Attachments

Under-an-Acre Pollution Prevention Plan (UPPP) – SCBL PMIS#152851 page 3 of 12

1 General Information

1.1 Responsible Parties

The following people and their companies are responsible for the implementation of this Under-an-acre

Pollution Prevention Plan (UPPP) and their complete contact information can be found in Appendix A.

The Company responsible for the UPPP is: ________________________________________________

The UPPP Preparer assigned to this project is: ____________________________________________

The UPPP Manager assigned to this project is: ____________________________________________

Additional UPPP staff are: ____________________________________________

1.2 UPPP Amendments

When changes in the approved UPPP are required, the contractor shall prepare and certify an amendment and submit it to the Contracting Officer (CO) for review and approval. See Division 1 Specifications, Section 01 57 23

– Amending UPPPs.

UPPP Amendment Log

Amendment No. Date Brief Description of Amendment Prepared By

1.3 Project Scope

This project would rehabilitate, restore and expand the historic visitor center at Scotts Bluff National Monument near Gering, Nebraska, see Appendix B for Vicinity Map and Erosion Control plan sheet. The work consists of the following:

• Deconstruction of the shed-roofed addition on the north side of the building

• Demolition of the amphitheater projection booth

• Deconstruction of a separate restroom

• Partial deconstruction of the adobe restroom

• Construction of additions on the north and east sides of the building

• New HVAC, electrical, plumbing and finishes throughout the existing and new portions of the building

• Adobe repair

• Associated site work

1.4 Standards and Constraints

The NDEQ Construction Activity Stormwater Permit will not apply to this project unless significant changes to the project scope because the construction disturbance is anticipated to be less than one acre.

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1.5 Spill Prevention

The Environmental Protection Agency (EPA) has promulgated an oil pollution prevention regulation requiring facilities to prepare and implement Spills Prevention Control and Counter (SPCC) measures plan to prevent discharge of oil or other petroleum products into waters of the United States.

The following BMPs will be used: Silt fence, vehicle tracking control, concrete washout area, and sediment control log.

Petroleum products will be used on site in construction equipment and at the location where equipment will be refueled. SPCC measures that will be in place for this project are:

1) Emergency spill kit(s) and absorbent pads will be kept on site.

2) In the case of a spill, after containment, the soil containing the spill will be excavated and placed in drums.

The drums containing the contained soil will be disposed of according applicable regulations.

3) The vehicle fueling area will be bermed to contain potential spills.

4) Fuel drums will be stored on pallets to prevent contact with the soil.

2 Project Details that Relate to the UPPP

2.1 Project Scheduling

The construction schedule has not been developed at this time as the project is still in the design phase.

Prior to commencement of construction activities, silt fence and other down-gradient BMPs should be in place.

BMPs should remain in place until final stabilization of the site is achieved.

2.2 Site Information

• Project size (acres): 0.75

• Area of disturbance (acres): 0.45

• Impervious area

• Before: .25 acres

• After: .28 acres

• Existing vegetative cover (type and present cover): The existing vegetative cover consists of heavy density grass of approximately 95% cover.

• Site topography: The topography of the site drains to the grass swell north east of the project location with slopes relatively flat. The project is located in the Middle North Platte Watershed.

• Receiving water (including storm drains): North Platte tributaries.

• Environmentally sensitive areas: There are no known environmentally sensitive areas.

2.2.1 Known Data on Soil and Fill

2.2.1.1 Soil

According to the geotechnical report performed by Yeh and Associates Inc., the soils consists of a thin layer of topsoil overlying silty sand to 8 feet.

2.2.1.2 Fill

The fill for pipe bedding, pipe zone, structural backfill and trench backfill materials has the potential to pollute stormwater with organics and debris.

Under-an-Acre Pollution Prevention Plan (UPPP) – SCBL PMIS#152851 page 5 of 12

2.3 Construction Information

2.3.1 Activities with the Potential to Generate Non-Storm Water Pollution

• Dust generated by scraping or grading

• Trash or debris

• Drywalling

• Portable toilet leak

• Minor refueling or maintenance of equipment

• Other

2.3.2 Activities and Materials with the Potential to Pollute Storm Water

• General construction activities and litter

• Vehicle fueling, repair and fluids (oil, grease, petroleum, and coolants)

• Paints

• Solvents, thinners, acids

• Mortar mix

• Treated lumber (materials and wastes)

• Demolition and masonry block rubble

• Landscaping, raw materials and wastes (topsoil, plant materials, herbicides, fertilizers, pesticides, mulch)

• BMP materials

• Base and sub-base material

• Asphaltic emulsions associated with asphalt-concrete paving operations

• Cement materials

• Concrete curing compounds

• Other

2.3.3 Activities with the Potential to Generate Sediment

• Lay down area and stockpiles

• Grubbing

• Grading

• Concrete work

• Trenching

• Dewatering

• Landscaping

• Other

3 Temporary Best Management Practices (BMPs) for Project Based on the project location’s characteristics, soil, and the scope of work, this project will require the following categories of BMPs:

• Management and Reporting;

• Waste Management;

• Non-Storm Water Pollution Control;

• Soil Stabilization (erosion prevention);

• Sediment Control;

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• Other Pollution Control

Specific BMPs for each category are discussed below and relevant installation specifications can be found

Appendix C.

3.1 Management and Reporting

• The erosion and sediment control measures shall be inspected by the contractor and evaluated continually throughout the construction period. Inspections shall be performed weekly and after any precipitation event or snow melt event that causes noticeable erosion onsite or in proximity to the project. Inspections required after storm and/or snowmelt events shall be conducted in a timely manner, but no more than 24 hours after the end of the storm event. If construction activities have been completed, but final stabilization has not yet been achieved, the frequency of inspections may be reduced to once every thirty (30) days.

• Inspections shall be conducted and findings documented pursuant to the State Permit. Inspections shall be recorded on an inspection form acceptable to the CO. See the Appendix for a sample inspection form. Inspections shall ensure adherence to all state and local jurisdictional requirements. Inspections shall also ensure compliance with the erosion control measures stipulated in this report. Lost or damaged erosion and sediment control devices shall be noted in the inspection report and shall be repaired or replaced immediately. Ineffective or inadequate devices shall also be noted in the inspection report and shall be immediately modified or replaced with an adequate device. Replacement and/or modification of ineffective or inadequate devices shall be completed immediately after the inspection.

Any observed differences or modifications to the UPPP made after an inspection shall be shown on an updated UPPP in a timely manner.

• Any reports of non-compliance and/or violations shall be recorded. A brief explanation shall detail how the instance of non-compliance and/or violation was rectified, and how future violations will be avoided.

The report shall then be signed indicating that site is once again in compliance by both the individual performing the inspection and the UPPP administrator.

• The UPPP operator shall keep a record of all inspections on site with the UPPP Plan. These records shall be made available to the CO or other authorities having jurisdiction upon request.

• Wherever inspection requirements differ between governing jurisdictions and/or this UPPP, the more stringent requirements shall apply.

3.2 Waste Management

• Trash and bulk waste collection areas need to be provided. Litter and debris from the site need to be cleaned up on a daily basis. The waste containers must be emptied before they are full and overflowing.

• Solid waste such as demolition debris, construction waste, food wrappers, etc. shall be collected in bins and disposed of to an approved landfill or other appropriate site. Where feasible, recyclable waste should be taken to a recycle facility.

• Toilet facilities must be provided on the site. Portable toilets must be located on level ground with tie-downs or stake-downs. The facilities must be checked for leaks. Ensure that waste and/or biocide are not spilled during maintenance.

• For materials management, a concrete washout area will be installed. If the concrete washout area is unlined, it should not be located within 400 feet of any natural drainage pathway or waterbody or

Under-an-Acre Pollution Prevention Plan (UPPP) – SCBL PMIS#152851 page 7 of 12 within 1,000 feet of any wells or drinking water sources. Adequate signage should be provided designating the concrete washout area. The concrete waste should be removed as necessary to maintain BMP function. The concrete waste should be delivered to a designated disposal location.

3.3 Non-Storm Water Pollution Control

Anticipated sources of non-stormwater pollution include:

• Vehicle fueling

• Trash and debris

Incidental use of chemicals in small quantities may be used on the site during the construction process, but they must be stored and used according to the manufacturer's recommendations to avoid becoming a potential source of pollution in storm water. All chemicals will be stored in enclosed storage areas, such as a trailer or covered shed, away from paths of concentrated storm water runoff. Storing the smallest practicable quantity of necessary chemicals is included in this BMP.

Fuels stored in on-site tanks must be enclosed within berms, capable of storing the entire volume of the fuel storage tank with one foot of freeboard. The width of the storage enclosure is recommended to be a minimum of one tank diameter beyond each side of the tank to prevent a potential springline leak from spewing over the top of the berm. The recommended berm height is 2.5 to 3 feet with a minimum top width of 2 feet.

If portable toilets will be placed on-site, it is recommended that they be placed near the construction trailer or another area with safe and easy access for those using the facility and those servicing it. They shall also be staked and placed on pervious areas away from the paths of concentrated storm water runoff and at least 10’ behind curb and no closer than 20’ from a storm inlet. If a spill occurs, the servicing company should be contacted immediately for spill cleanup. Portable toilets shall be inspected and maintained on a weekly basis and documented on the inspection form. Replacement or removal of waste from portable toilet shall be as prescribed by the provider at the beginning of the project. The project superintendent shall monitor the portable toilets during construction to ensure that the maintenance of the toilets is sufficient and shall revise the maintenance schedule as required.

Trash, debris and spoils shall be properly contained at the end of each day. All waste generated from the construction activities must be placed in trash receptacles provided and maintained by the contractor. These trash receptacles are to be sized appropriately for the expected waste to be contained, and should be placed in areas away from the paths of concentrated storm water runoff on pervious areas. All designated waste containers will be removed weekly from the site as soon as possible to prevent it from polluting storm water.

Trash shall be picked up at the end of each day and put in the designated waste containers.

No bury of wastes is permitted onsite.

All of the erosion and sediment control measures specified will also help control wind erosion. Air pollution controls, such as watering may become necessary. If dust becomes a significant problem, the contractor may be required to dampen soils with potable water by a method approved by the engineer. Inspections shall be performed after high wind events.

3.4 Erosion Control - Soil Stabilization

Controlling erosion is the primary tool to prevent pollution of waters from construction activity. Soil stabilization should be pursued as soon as possible to prevent erosion from starting.

• Graded areas should be seeded as soon as is practicable after completion of grading activities.

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• Slopes greater than 4:1 should be stabilized with erosion control matting or other approved method such as tackifiers.

Permanent seeding will be used as a soil stabilization BMP. During construction, soil will be exposed. No erosion control BMPs were selected during this time because the disturbed area is so small and the site does not experience significant grades. When the work is completed, the exposed soil will be seeded permanently to prevent erosion. Maintenance of the seeded areas is necessary.

3.5 Sediment Control

See Erosion Control Drawings for suggested location of BMPs and implement the following:

• Install BMPs prior to commencing construction activities.

• Inspect all BMPs every 2 weeks and after storm events.

• Make adjustments and changes accordingly if BMPs are not performing.

• Repair damaged BMPs promptly.

• Remove accumulated sediment.

• Clean Public roadways of any soil deposits at the end of the work day.

3.6 Other Pollution Control

• Wind erosion: Limit the amount of soil disturbance at any given time to mitigate wind erosion potential.

Use watering trucks if necessary to control dust.

• Vehicle tracking pollutants: Maintain vehicle tracking controls at all times. Use street sweeping if necessary to clean up paved surfaces off site.

4 Permanent Pollution Control Practices Permanent pollution control practices include construction of soil riprap at the sump discharge outlet and permanent seeding of disturbed areas by grading, flatwork and site access.

5 References

• Geotechnical Investigation Report, Scotts Bluff National Monument 190276 Old Oregon Trail

Road Gering Nebraska 69341, Yeh and Associates, Inc., January 6,2017

• Project Drawings

Under-an-Acre Pollution Prevention Plan (UPPP) – SCBL PMIS#152851 page 9 of 12

6 Appendices

Appendix A: Contact Information

Name Company Phone Email Address

UPPP

Company

Preparer

Manager

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Appendix B: Pollution Prevention Control Maps or Sheet(s)

THIS PROJECT

THIS PROJECT

OR

OR

Design (Title I)

Prepared in Accordance with Preliminary by Preliminary Design (Title I)

Construction Drawing Not Preceded

Approved by Superintendent on

Variance from Preliminary Design (Title I)

Project Manager

Drawing No.

Date

Date

QUALITY DESIGN CERTIFICATIONSheetMark REVISION Date Initial

STATEREGION COUNTY

LOCATION WITHIN PARK

NAME OF PARK

TITLE OF DRAWING DRAWING NO.

DEPARTMENT OF THE INTERIOR

UNITED STATES

NATIONAL PARK SERVICE

DENVER SERVICE CENTER

PMIS

GOLDEN, CO 80401

ANDERSON HALLAS ARCHITECTS, P.C.

ARCHITECT

PMIS/PKG NO.

SHEET

OF2

:5 :0

P M

152851

152851

127432

1 101

SOLICITATION # ___________

SCOTTS BLUFF NATIONAL MONUMENT

SCOTTS BLUFF NEBRASKAMIDWEST

VC REHABILITATION & EXPANSION

VISITOR CENTER

DD

MIDWEST

NEBRASKA

SCOTTS BLUFF NATIONAL MONUMENT

BASIC DATA: [[[INSERT MAP DATA]]]

PRELIMINARY

NOT FOR

CONSTRUCTION

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Appendix C: Standard Installation Specifications for each BMP

Silt Fence (SF) SC-1

November 2010 Urban Drainage and Flood Control District SF-1 Urban Storm Drainage Criteria Manual Volume 3

Photograph SF-1. Silt fence creates a sediment barrier, forcing sheet flow runoff to evaporate or infiltrate.

Description A silt fence is a woven geotextile fabric attached to wooden posts and trenched into the ground. It is designed as a sediment barrier to intercept sheet flow runoff from disturbed areas.

Appropriate Uses A silt fence can be used where runoff is conveyed from a disturbed area as sheet flow. Silt fence is not designed to receive concentrated flow or to be used as a filter fabric. Typical uses include:

Down slope of a disturbed area to accept sheet flow.

Along the perimeter of a receiving water such as a stream, pond or wetland.

At the perimeter of a construction site.

Design and Installation Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter control, should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the silt fence.

See Detail SF-1 for proper silt fence installation, which involves proper trenching, staking, securing the fabric to the stakes, and backfilling the silt fence. Properly installed silt fence should not be easily pulled out by hand and there should be no gaps between the ground and the fabric.

Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and other specifications in the design details. Improper installation of silt fence is a common reason for silt fence failure; however, when properly installed and used for the appropriate purposes, it can be highly effective.

Silt Fence Functions Erosion Control No Sediment Control Yes Site/Material Management No

SC-1 Silt Fence (SF)

SF-2 Urban Drainage and Flood Control District November 2010

Photograph SF-2. When silt fence is not installed along the contour, a "J-hook" installation may be appropriate to ensure that the BMP does not create concentrated flow parallel to the silt fence. Photo courtesy of Tom Gore.

Maintenance and Removal Inspection of silt fence includes observing the material for tears or holes and checking for slumping fence and undercut areas bypassing flows. Repair of silt fence typically involves replacing the damaged section with a new section. Sediment accumulated behind silt fence should be removed, as needed to maintain BMP effectiveness, typically before it reaches a depth of 6 inches.

Silt fence may be removed when the upstream area has reached final stabilization.

Silt Fence (SF) SC-1

November 2010 Urban Drainage and Flood Control District SF-3

SC-1 Silt Fence (SF)

SF-4 Urban Drainage and Flood Control District November 2010

Sediment Control Log (SCL) SC-2

November 2010 Urban Drainage and Flood Control District SCL-1

Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a perimeter control around a soil stockpile; and, 2) as a "J-hook" perimeter control at the corner of a construction site.

Description A sediment control log is a linear roll made of natural materials such as straw, coconut fiber, or other fibrous material trenched into the ground and held with a wooden stake. Sediment control logs are also often referred to as "straw wattles." They are used as a sediment barrier to intercept sheet flow runoff from disturbed areas.

Appropriate Uses Sediment control logs can be used in the following applications to trap sediment:

As perimeter control for stockpiles and the site.

As part of inlet protection designs.

As check dams in small drainage ditches. (Sediment control logs are not intended for use in channels with high flow velocities.)

On disturbed slopes to shorten flow lengths (as an erosion control).

As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland.

Sediment control logs work well in combination with other layers of erosion and sediment controls.

Design and Installation Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to sediment control logs installed along the contour. When installed for other uses, such as perimeter control, it should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the BMP.

Sediment Control Log

Erosion Control Moderate

SC-2 Sediment Control Log (SCL)

SCL-2 Urban Drainage and Flood Control District November 2010

Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become a barrier and should be installed is if they are impermeable.

Design details and notes for sediment control logs are provided in Detail SCL-1. Sediment logs must be properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to flow).

Improper installation can lead to poor performance. Be sure that sediment control logs are properly trenched, anchored and tightly jointed.

Maintenance and Removal Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the depth is one-half the height of the sediment log and repair damage to the sediment log, typically by replacing the damaged section.

Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as permanent slope breaks). However, removal of sediment control logs after final stabilization is typically recommended when used in perimeter control, inlet protection and check dam applications.

November 2010 Urban Drainage and Flood Control District SCL-3

SC-2 Sediment Control Log (SCL)

SCL-4 Urban Drainage and Flood Control District November 2010

November 2010 Urban Drainage and Flood Control District SCL-5

Rock Sock (RS) SC-5

November 2010 Urban Drainage and Flood Control District RS-1 Urban Storm Drainage Criteria Manual Volume 3

Photograph RS-1. Rock socks placed at regular intervals in a curb line can help reduce sediment loading to storm sewer inlets. Rock socks can also be used as perimeter controls.

Description A rock sock is constructed of gravel that has been wrapped by wire mesh or a geotextile to form an elongated cylindrical filter. Rock socks are typically used either as a perimeter control or as part of inlet protection.

When placed at angles in the curb line, rock socks are typically referred to as curb socks. Rock socks are intended to trap sediment from stormwater runoff that flows onto roadways as a result of construction activities.

Appropriate Uses Rock socks can be used at the perimeter of a disturbed area to control localized sediment loading. A benefit of rock socks as opposed to other perimeter controls is that they do not have to be trenched or staked into the ground; therefore, they are often used on roadway construction projects where paved surfaces are present.

Use rock socks in inlet protection applications when the construction of a roadway is substantially complete and the roadway has been directly connected to a receiving storm system.

Design and Installation When rock socks are used as perimeter controls, the maximum recommended tributary drainage area per 100 lineal feet of rock socks is approximately 0.25 acres with disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail RS-1. Also see the Inlet Protection Fact Sheet for design and installation guidance when rock socks are used for inlet protection and in the curb line.

When placed in the gutter adjacent to a curb, rock socks should protrude no more than two feet from the curb in order for traffic to pass safely. If located in a high traffic area, place construction markers to alert drivers and street maintenance workers of their presence.

Maintenance and Removal Rock socks are susceptible to displacement and breaking due to vehicle traffic. Inspect rock socks for damage and repair or replace as necessary. Remove sediment by sweeping or vacuuming as needed to maintain the functionality of the BMP, typically when sediment has accumulated behind the rock sock to one-half of the sock's height.

Once upstream stabilization is complete, rock socks and accumulated sediment should be removed and properly disposed.

Rock Sock Functions Erosion Control No

SC-5 Rock Sock (RS)

RS-2 Urban Drainage and Flood Control District November 2010

Rock Sock (RS) SC-5

November 2010 Urban Drainage and Flood Control District RS-3

Inlet Protection (IP) SC-6

November 2010 Urban Drainage and Flood Control District IP-1 Urban Storm Drainage Criteria Manual Volume 3

Photograph IP-1. Inlet protection for a curb opening inlet.

Description Inlet protection consists of permeable barriers installed around an inlet to filter runoff and remove sediment prior to entering a storm drain inlet. Inlet protection can be constructed from rock socks, sediment control logs, silt fence, block and rock socks, or other materials approved by the local jurisdiction.

Area inlets can also be protected by over-excavating around the inlet to form a sediment trap.

Appropriate Uses Install protection at storm sewer inlets that are operable during construction.

Consider the potential for tracked-out sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets must be protected. This may include inlets in the general proximity of the construction area, not limited to downgradient inlets. Inlet protection is not

Design and Installation a stand-alone BMP and should be used in conjunction with other upgradient BMPs.

To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet to function without completely blocking flows into the inlet in a manner that causes localized flooding.

When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump or on-grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a curb and gutter setting, but are effective area inlet protection measures.

Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary products are available for inlet protection that may be approved for use by local governments. If proprietary products are used, design details and installation procedures from the manufacturer must be followed. Regardless of the type of inlet protection selected, inlet protection is most effective when combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier before runoff enters the storm sewer or receiving water.

Design details with notes are provided for these forms of inlet protection:

IP-1. Block and Rock Sock Inlet Protection for Sump or On-grade Inlets

IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade Inlets

Inlet Protection (various forms)

Functions Erosion Control No

SC-6 Inlet Protection (IP)

IP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3

IP-3. Rock Sock Inlet Protection for Sump/Area Inlet

IP-4. Silt Fence Inlet Protection for Sump/Area Inlet

IP-5. Over-excavation Inlet Protection

IP-6. Straw Bale Inlet Protection for Sump/Area Inlet

CIP-1. Culvert Inlet Protection

Propriety inlet protection devices should be installed in accordance with manufacturer specifications.

More information is provided below on selecting inlet protection for sump and on-grade locations.

Inlets Located in a Sump

When applying inlet protection in sump conditions, it is important that the inlet continue to function during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower than the top of the curb opening to allow overflow into the inlet during larger storms without excessive localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing localized flooding, public safety issues, and downstream erosion and damage from bypassed flows.

Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and stacked around the area inlet (on pervious surfaces), over-excavation around the inlet, and proprietary products providing equivalent functions.

Inlets Located on a Slope

For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads, also see the Check Dam Fact Sheet.

Maintenance and Removal Inspect inlet protection frequently. Inspection and maintenance guidance includes:

Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents of the BMP (e.g., gravel) washing into the inlet.

Check for improper installation resulting in untreated flows bypassing the BMP and directly entering the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been properly trenched around the inlet can result in flows under the silt fence and directly into the inlet.

Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also crush or displace the BMP.

Monitor sediment accumulation upgradient of the inlet protection.

November 2010 Urban Drainage and Flood Control District IP-3 Urban Storm Drainage Criteria Manual Volume 3

Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches.

Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain the functionality of the BMP.

Propriety inlet protection devices should be inspected and maintained in accordance with manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed in a timely manner to prevent devices from breaking and spilling sediment into the storm drain.

Inlet protection must be removed and properly disposed of when the drainage area for the inlet has reached final stabilization.

IP-4 Urban Drainage and Flood Control District November 2010

November 2010 Urban Drainage and Flood Control District IP-5

IP-6 Urban Drainage and Flood Control District November 2010

November 2010 Urban Drainage and Flood Control District IP-7

Construction Fence (CF) SM-3

November 2010 Urban Drainage and Flood Control District CF-1

Photograph CF-1. A construction fence helps delineate areas where existing vegetation is being protected. Photo courtesy of Douglas County.

Description A construction fence restricts site access to designated entrances and exits, delineates construction site boundaries, and keeps construction out of sensitive areas such as natural areas to be preserved as open space, wetlands and riparian areas.

Appropriate Uses A construction fence can be used to delineate the site perimeter and locations within the site where access is restricted to protect natural resources such as wetlands, waterbodies, trees, and other natural areas of the site that should not be disturbed.

If natural resource protection is an objective, then the construction fencing should be used in combination with other perimeter control BMPs such as silt fence, sediment control logs or similar measures.

Design and Installation Construction fencing may be chain link or plastic mesh and should be installed following manufacturer’s recommendations. See Detail CF-1 for typical installations.

Do not place construction fencing in areas within work limits of machinery.

Maintenance and Removal Inspect fences for damage; repair or replace as necessary.

Fencing should be tight and any areas with slumping or fallen posts should be reinstalled.

Fencing should be removed once construction is complete.

Construction Fence

Erosion Control No Sediment Control No Site/Material Management Yes

SM-3 Construction Fence (CF)

CF-2 Urban Drainage and Flood Control District November 2010

Construction Fence (CF) SM-3

November 2010 Urban Drainage and Flood Control District CF-3

Vehicle Tracking Control (VTC) SM-4

November 2010 Urban Drainage and Flood Control District VTC-1

Photograph VTC-1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking.

Descr iption Vehicle tracking controls provide stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto the paved surface.

Appropr iate Uses Implement a stabilized construction entrance or vehicle tracking control where frequent heavy vehicle traffic exits the construction site onto a paved roadway. An effective vehicle tracking control is particularly important during the following conditions:

Wet weather periods when mud is easily tracked off site.

During dry weather periods where dust is a concern.

When poorly drained, clayey soils are present on site.

Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at particularly muddy sites.

Design and Installation Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including:

VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires.

VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance.

Vehicle Tracking Control Functions Erosion Control Moderate

SM-4 Vehicle Tracking Control (VTC)

VTC-2 Urban Drainage and Flood Control District November 2010

Photograph VTC-2. A vehicle tracking control pad with wheel wash facility. Photo courtesy of Tom Gore.

VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as hand-held power washing equipment to more advance proprietary systems. When a wheel wash is provided, it is important to direct wash water to a sediment trap prior to discharge from the site.

Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.

Maintenance and Removal Inspect the area for degradation and replace aggregate or material used for a stabilized entrance/exit as needed. If the area becomes clogged and ponds water, remove and dispose of excess sediment or replace material with a fresh layer of aggregate as necessary.

With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way.

Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment in the roadway indicates that the stabilized construction entrance needs maintenance.

Ensure that drainage ditches at the entrance/exit area remain clear.

A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to occur. This is typically after the site has been stabilized.

When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to discharge. Also inspect channels conveying the water from the wash area to the sediment trap and stabilize areas that may be eroding.

When a construction entrance/exit is removed, excess sediment from the aggregate should be removed and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface following removal, typically by paving.

November 2010 Urban Drainage and Flood Control District VTC-3

VTC-4 Urban Drainage and Flood Control District November 2010

November 2010 Urban Drainage and Flood Control District VTC-5

VTC-6 Urban Drainage and Flood Control District November 2010

Stockpile Management (SP) MM-2

November 2010 Urban Drainage and Flood Control District SP-1 Urban Storm Drainage Criteria Manual Volume 3

Photograph SP-1. A topsoil stockpile that has been partially revegetated and is protected by silt fence perimeter control.

Description Stockpile management includes measures to minimize erosion and sediment transport from soil stockpiles.

Appropriate Uses Stockpile management should be used when soils or other erodible materials are stored at the construction site.

Special attention should be given to stockpiles in close proximity to natural or manmade storm systems.

Design and Installation Locate stockpiles away from all drainage system components including storm sewer inlets. Where practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a stabilized designated access point on the upgradient side of the stockpile.

Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14 days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are "typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that may be more prescriptive.

Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to space or right-of-way constraints.