Stormwater_Pollution_Prevention_Plan_(SWPPP).pdf

211 N. RACE STREET DEMOLITION & SITE REMEDIATION

SECTION 23-00670-00-BD

URBANA, ILLINOIS

STORM WATER POLLUTION PREVENTION PLAN

February 13, 2025

Prepared by:

Farnsworth Group Inc.

100 Walnut Street, Suite 200

Peoria, Illinois 61602 p 309.689.9888

A COPY OF THIS PLAN SHALL BE RETAINED AT THE

CONSTRUCTION SITE AT ALL TIMES FROM THE START

OF THE PROJECT UNTIL FINAL STABILIZATION.

THE SWPPP MUST BE KEPT IN A LOCATION EASILY

FOUND WHEN NO PERSONNEL ARE PRESENT OR THE

STORAGE LOCATION OF THE SWPPP MUST BE POSTED

NEAR THE ENTRANCE.

Storm Water Pollution Prevention Plan

Version 01.24.2025

FARNSWORTH GROUP / 1

TABLE OF CONTENTS

1.0 APPLICABLE CODES

2.0 SITE EVALUATION, ASSESSMENT, AND PLANNING

1.1 Project / Site Information

1.2 Contact Information

1.3 Nature and Sequence of Construction Activity

1.4 Soils, Slopes, Vegetation, and Drainage Patterns

1.5 Receiving Waters

1.6 Potential Sources of Pollution

1.7 Endangered Species Certification

1.8 Historic Preservation

1.9 Wetlands

1.10 Natural Buffers

1.11 FEMA Floodplain

3.0 EROSION AND SEDIMENT CONTROL BMPS

3.1 Stockpiled Sediment or Soil

3.2 Perimeter Controls

3.3 Protect Slopes

3.4 Protect Storm Inlets, Manholes, Culverts

3.5 Dewatering Practices

3.6 Establish Stabilized Construction Exits

3.7 Dust Control

3.8 Stabilization Methods

3.9 Permanent Erosion Controls

3.10 Good Housekeeping

4.0 MAINTENANCE

5.0 INSPECTIONS

5.1 Inspection Personnel and Contact Information

5.2 Inspection Schedule and Procedures:

5.3 Determining Rainfall Amounts

6.0 REQUIRED DOCUMENTATION

6.1 Record of Land Disturbing Activities

6.2 Inspection Report

Contact Information:

Cristin Robertson, Civil Engineer p 309.689.9888 crobertson@f-w.com

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6.3 Corrective Action Log

6.4 Incidence of Non-Compliance

6.5 Log of Changes to the SWPPP

6.6 Record of Dewatering Activities

6.7 Notice of Termination

7.0 SITE STABILIZATION

7.1 Stabilization Timeline

7.2 Temporary Stabilization

7.3 Stabilization Criteria

7.4 Final Stabilization & Site Restoration

8.0 FAILURE TO COMPLY

9.0 CERTIFICATION AND NOTIFICATION

10.0 SWPPP APPENDICES

Appendix A – Maps & PlanS

Appendix B - Copy of Construction General Permit

Appendix C - Copy of Notice of Intent to Construct Documentation

Appendix D – Additional Site-Specific Information

Appendix E – Emergency Release Notification Procedures

Appendix F – Select Best Management Practice Details

Appendix G – Sub Contractor Certification Form

Appendix H – Documentation Forms

Appendix I – Completed SWPPP Documentation

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1.0 APPLICABLE CODES

Construction on the project shall be in accordance with the stricter of the following codes and guidelines:

1. City of Urbana Manual of Practice and Erosion and Sediment Control Ordinance No. 2007-11-133 and Class 1 Erosion Control Permit Manual of Practice (December 2024)

2. NPDES Permit No. ILR10 National Pollutant Discharge Elimination System General Permit for Storm

Water Discharges from Construction Site Activities (Illinois Environmental Protection Agency, August

31, 2023)

3. Illinois Urban Manual (IUM)

4. Illinois Department of Transportation (IDOT) Standard Specifications for Road and Bridge

Construction (January 1, 2022) and Supplemental Specifications and Recurring Special Provisions

(January 1, 2025)

5. Illinois Department of Transportation (IDOT) Revision #228 of the Highway Standards (January 1, 2025)

2.0 SITE EVALUATION, ASSESSMENT, AND PLANNING

1.1 PROJECT / SITE INFORMATION

Project Name: 211 N. RACE STREET DEMOLITION & SITE REMEDIATION

SECTION 23-00670-00-BD

Project Location:

The primary project is located on the southwest corner of Griggs Street and Race Street. For the purpose of this document, the primary site will be known as “Demolition Site” or “Site 1”. The site is the former location of the Urbana Schools Adult Education and Administrative offices.

As part of the project, an area of Prairie Park will be used for borrow material, stock pile storage and final placement of extra usable fill. Prairie Park is north of E Washington St, south of Art Bartell Rd and east of S Lierman Ave in Urbana. This site will be known as “Borrow Site” or “Site 2”.

A location map is included in the Appendix.

DEMOLITION SITE 1

Project Address: 131, 205 & 211 N Race St, Urbana, Illinois 61801

County: Champaign

Township/Ranges:

T: 19N R: 9E Sect: 8 Mer: 3 Quad: Urbana Twp: Cunningham

Latitude: 40o06’49.4” N Longitude: 88o12’33.7” W

World Geodetic System of 1984 (WGS84)

Determined by the Illinois State Geological Survey (www.isgs.illinois.edu/plss)

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BORROW SITE 2

Project Address: Prairie Park Site: 2000 E Washington St, Urbana, Illinois 61802

County: Champaign

Township/Ranges:

T: 19N R: 9E Sect: 16 Mer: 3 Quad: Urbana Twp: Cunningham

Latitude: 40o06’25.8” N Longitude: 88o04’04.1” W

World Geodetic System of 1984 (WGS84)

Determined by the Illinois State Geological Survey (www.isgs.illinois.edu/plss)

Total Parcel Area: 0.96 Acres (Site 1) + 20 Acres (Site 2) = 21 Acres

Construction Site Area to be disturbed: 2.8 Acres ±

Is the project located in Native American / Indian country? Yes

No

Is this project considered a federal facility? Yes

No

NPDES Project or Permit Tracking Number: ILR10ZF6W

Notice of Intent to Construct Submittal Date: 2/13/2025

Related NPDES Tracking Numbers: N/A

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1.2 CONTACT INFORMATION

Owner(s):

City of Urbana

706 Glover Avenue

Urbana, Illinois 61802

Contact Name: John Zeman, City Engineer

Telephone Number: 217-384-2390

Email Address: John.zeman@urbanail.gov

Site Contractor:

Company Name

Mailing Address:

Town, State, Zip:

SWPPP Preparation By:

Farnsworth Group, Inc.

100 Walnut Street, Suite 200

Peoria, Illinois 61602

Contact Name: Cristin Robertson

Telephone Number: 309.689.9888

Email Address: crobertson@f-w.com

1.3 NATURE AND SEQUENCE OF CONSTRUCTION ACTIVITY

Project Description:

The proposed project would demolish existing buildings, removal existing pavement and utilities and restore the area to grass on the site designated Site 1. The secondary site will be used for earthwork balance and storage. Borrow material will be removed and excess will be graded and seeded on the park site.

Estimated Project Start Date: 3/14/2025

Estimated Project Completion Date: 11/03/2025

Sequence of Soil Disturbing Activities:

1. Clearing and grubbing to allow to the installation of perimeter erosion controls.

2. Placing of temporary erosion controls. Soil erosion and sediment control measures are to be installed, modified, and maintained as construction progresses.

3. Site Clearing and demolition of buildings, pavement, utilities.

4. Removal of soil from secondary site.

5. Restoration and seeding at both sites.

6. After stabilization, temporary erosion controls will be removed and site restored. Silt to be properly disposed.

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1.4 SOILS, SLOPES, VEGETATION, AND DRAINAGE PATTERNS

Geotechnical Reports:

Available upon request.

DEMO SITE 1

Soil type(s):

According to the National Resource Conservation Survey web soil survey (survey data August 21, 2024), the site is split between Map Unit 533 Urban Land and Map Unit 3107A silty clay loam. The typical

Hydrologic Soil Group is Group D.

Runoff Coefficient:

In accordance with Section IV.D.1.d of the General Permit, the following table lists the estimated runoff coefficient (C) relating the amount of runoff expected as a ratio of precipitation received.

Table 1 Runoff Coefficients Site 1

EXISTING CONDITIONS

AREA DESCRIPTION AREA (AC) RUNOFF COEFFICIENT

IMPERVIOUS AREA 0.96 0.95

TOTAL SITE 2 0.96 0.95

PROPOSED CONDITIONS

AREA DESCRIPTION AREA (AC) RUNOFF COEFFICIENT

GRASS / LAWN 0.86 0.15

IMPERVIOUS AREA 0.10 0.95

TOTAL SITE 2 0.96 0.23

Slopes & Erosion Factors:

The erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water. For the portion of the parcel on the west by the creek, the K rating is 0.28 indicating moderate susceptibility to erosion by water. The remainder of the site is a mixture of various fills categorized as “Urban Land” indicating that the tendency to erode will vary through the site.

Drainage Patterns:

Drainage from the project generally flows from north to south. There is a high ridge in the middle

(running north to south) that directs half of the runoff to the east to the Race Street right-of-way and to the west to Boneyard Creek.

Soil type(s):

According to the National Resource Conservation Survey web soil survey (survey data August 21, 2024), the site is designated Map Unit 802B, Orthents. The soil is classified is primarily Hydrologic Soil Group C.

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Runoff Coefficient:

In accordance with Section IV.D.1.d of the General Permit, the following table lists the estimated runoff coefficient (C) relating the amount of runoff expected as a ratio of precipitation received.

Table 2 Runoff Coefficients Site 2

EXISTING CONDITIONS

GRASS, AVERAGE SLOPE 1.8 0.15

TOTAL SITE 2 1.8 0.15

PROPOSED CONDITIONS

GRASS, STEEP SLOPE 1.8 0.20

TOTAL SITE 2 1.8 0.20

Slopes & Erosion Factors:

The erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water. According the

Web Soil Survey, the K value is 0.37 indicating moderate susceptibility to erosion by water.

Drainage Patterns:

The area of the park to be affected by the project is a hill with a high point in the middle. Water flows down each side of the hill, then eventually to the south east.

1.5 RECEIVING WATERS

DEMO SITE 1

Owner of Storm Sewer System: City of Urbana

Receiving waters: Boneyard Creek, Hydrologic Unit 051201090202, tributary to Crystal Lake – Saline

Branch Drainage Ditch (IL_BPJC-06)

Listing as a 303(d) Impaired Water: Saline Branch Drainage Ditch, Fecal Coliform

Note: No direct discharge to an Impaired Waterway.

Owner of Storm Sewer System: City of Urbana

Receiving waters: Hydrologic Unit 051201090305 Unnamed tributary to St Joseph-Salt Fork (IL_BPJ-09)

Listing as a 303(d) Impaired Water: No

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1.6 POTENTIAL SOURCES OF POLLUTION

The following pollutants of concern will be associated with this construction project:

Soil Sediment Petroleum (gas, diesel, oil, kerosene, hydraulic oil / fluids)

Concrete Antifreeze / Coolants

Concrete Truck Waste Waste water from cleaning construction equipment

Concrete Curing Compounds Polymers

Solid Waste/Debris Flocculants

Paints Cationic Treatment Chemicals

Solvents Other (specify)

Fertilizers / Pesticides Other (specify)

1.7 ENDANGERED SPECIES CERTIFICATION

This project will be submitted to the Illinois Department of Natural Resources for review through a separate process. Any reference documents, restrictions, and additional guidelines regarding endangered species should be placed in the appendices once available.

1.8 HISTORIC PRESERVATION

This project was submitted to the Illinois STATE HISTORIC PRESERVATION OFFICE for review through a separate process. Any reference documents, restrictions, and additional guidelines regarding historic preservation should be placed in the appendices once available.

1.9 WETLANDS

No certified wetlands were found on the Prairie Park portion of the site, however designated Riverine wetlands are found along the creek at the Adult Education site. The project is limited to demolition of hardscape with no intention of disturbing natural vegetation. See Appendix for more wetland information.

1.10 NATURAL BUFFERS

Special care shall be taken to avoid siltation of Boneyard Creek. Additional BMPs shall be constructed along the banks including a double row of silt fence (spaced 3 feet apart). Land disturbance in the vegetated area should be minimized. Select plants may be removed and authorized plants may be planted. Any full clearing of vegetation shall be stabilized with erosion control blanket immediately after disturbance.

1.11 FEMA FLOODPLAIN

The Adult Education (Site 1) contains FEMA designated Floodplain along Boneyard Creek. (FEMA Panel

17019C0427D) No fill or restriction of flow should be constructed within the Creek. See Appendix for additional information. The Park Site 2 does not contain floodplain.

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3.0 EROSION AND SEDIMENT CONTROL BMPS

The following erosion and sediment control Best Management Practices (BMP) shall be implemented for each of the major construction activities described previously in this document. For each measure discussed, the contractor will be responsible for the implementation as indicated in the most recent edition of the Illinois Urban Manual (Association of Illinois Soil & Water Conservation Districts). The contractor, and subcontractors, will notify the resident engineer of any proposed changes, maintenance, or modifications to keep construction activities compliant with the General Permit and any other applicable local erosion control requirements.

3.1 STOCKPILED SEDIMENT OR SOIL

General

All temporary soil stockpiles constructed and stored for longer than 24 hours must be protected from erosion. Soil stockpiles will be located away from storm inlets and outside direct flow of stormwater.

Once the stockpile is no longer needed, properly dispose of excess material and restore ground surface.

Stockpile Cover and Stabilization

Description

Any soil stockpile stored undisturbed for longer than 14 days shall be either covered or stabilized.

Installation

• Where practicable, the stockpile shall be covered to protect against wind and water erosion.

• If not covered, all temporary stockpiles shall be stabilized by temporary seeding in accordance with Site Stabilization section of this document.

• Stockpiles shall not be placed within an area of concentrated flow or designated floodways.

Maintenance Requirements

The stockpiles are to be inspected in accordance with this document. Inspection will include verification that the stockpiles are maintained per this document. Sediment may not be removed from impervious surfaces directly into a storm sewer system without being passed through a filter BMP included in this document or similar approved BMP.

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Stockpile Silt Fence

Perimeter controls such as silt fence shall be installed immediately to prevent runoff from stockpiles.

The silt fence consists of filter fabric stretched across and attached to posts that will intercept sediment contained in runoff.

• The silt fence is to be installed prior to any land disturbance and as soon as stockpile and staging areas are established.

• Silt fence is not appropriate for paved areas, areas of slopes steeper than 5%, or areas of concentrated flow.

• When silt fence is temporarily removed to access the stockpile, the BMP must be reinstalled in accordance with this document.

• Silt fence to be installed around the perimeter of the stockpile according to the Illinois Urban

Manual Standard 920 and Detail 627.

The silt fence is to be inspected in accordance with the Inspection Section of this SWPPP document.

Inspection will include ensuring the silt fence is installed and maintained per specifications. Inspection must ensure that the fence is installed properly so that water flows through the structure. Maintenance will include repairing or replacing if damaged and the removal of sediment when the sediment reaches half the height of the silt fence.

3.2 PERIMETER CONTROLS

Silt Fence

Silt fence will be installed to prevent runoff from disturbed areas. The silt fence consists of filter fabric stretched across and attached to posts that will intercept sediment contained in runoff.

• The silt fence is to be installed prior to any land disturbance and as soon as stockpile and staging areas are established.

• Silt fence should be installed on the downslope from any disturbed area.

• Silt fence should be installed along the contour, at an approximately equal elevation. Both ends of the perimeter control should be installed upslope at a 45-degree to prevent circumventing the edge of the fence.

• Silt fence is not appropriate for paved areas, areas of slopes steeper than 5%, or areas of concentrated flow.

• Silt fence to be installed according to the details in the Appendix and the Illinois Urban Manual

Standard 920 and Detail 620.

The silt fence is to be inspected in accordance with Inspection Section of this SWPPP document.

Inspection will include verification of proper installation and maintenance in accordance with this document. Inspection must verify that proper installation allows water to flow through the structure.

Maintenance will include repairing or replacing if damaged and the removal of sediment when the sediment reaches half the height of the silt fence.

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Aggregate Ditch Check

Aggregate Ditch Checks are rock check dams constructed across a swale or other concentrated flow to reduce the velocity of stormwater entering or exiting the site.

• Rock Check Dams are suitable for use in open channels and swales with a drainage area of less than 10 acres.

• The center of the rock check dam must be lower than the sides to form a weir and to prevent scour where the rock meets the soil, in accordance with the detail in the Appendix.

• For roadside ditch checks, see Rolled Excelsior Ditch Checks.

• Aggregate Ditch Checks to be installed according to the details in the Appendix and the Illinois

Urban Manual Standard 905 and Detail 605, where applicable.

The aggregate ditch checks are to be inspected in accordance with the Inspection Section of this SWPPP document Inspection will include verification of proper installation and maintenance in accordance with this document. Once sediment has reached one-half of the height of the ditch check, sediment shall be removed and properly discarded. Ditch checks shall be repaired or replaced if inspection finds scour, dislodged rocks or damage. Debris such as litter or corn stalks must be removed.

Rolled Excelsior Ditch Checks

Ditch checks are pre-fabricated temporary flow thru devices to be installed across a swale or other concentrated flow to reduce the velocity of stormwater entering or exiting the site.

• Rolled Excelsior Check Dams are suitable for use in roadside ditches with slopes less than 8%.

• Ditch checks shall be trenched in 3 inches, per Illinois Urban Manual Detail 514.

• The center of the ditch check must be lower than the sides to form a weir and prevent water from traveling around the edges, in accordance with the detail in the Appendix.

• For concentrated flow in swales and drainage ways, see Aggregate Ditch Checks.

• Rolled Excelsior Check Dams are to be installed according to Illinois Urban Manual Standard 905 and Detail 514 and Manufacturer Recommendations.

Rolled Excelsior Ditch Checks are to be inspected in accordance with The Inspection Section of this

SWPPP document. Inspection will include verification of proper installation and maintenance in accordance with this document. Once sediment has reached one-half of the height of the ditch check, sediment shall be removed and properly discarded. Ditch checks shall be repaired or replaced if inspection finds tears, splits or unraveling. Debris such as litter or corn stalks must be removed. Water should flow through the ditch check or over the center of the ditch check. If water is running under or around, the ditch check must be reinstalled or lengthened.

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3.3 PROTECT SLOPES

Erosion Control Blanket

Erosion control blankets will be applied to protect exposed soil surfaces against erosion due to rainfall or flowing water. Erosion control blankets should be used on slopes greater than 4:1, in areas of highly concentrated flows, or in areas where project specification require for the establishment of seeding.

• Erosion control blankets are to be installed while construction activities are occurring and/or after construction activities have been completed.

• Erosion control blankets are to be installed per manufacturer’s specifications and per the detail in the Appendix and the Illinois Urban Manual Standard 830 and Detail 530.

Inspections are to occur in accordance with The Inspection Section of this SWPPP document. The inspection will include a check for tears or holes in blankets, and to verify that water flowing under the blanket is not causing erosion. Any areas where the blanket is damaged or is not in close contact with the ground will be repaired or replaced.

3.4 PROTECT STORM INLETS, MANHOLES, CULVERTS

All storm sewer inlets, manholes and culverts on the constructions site or within the drainage perimeter of the construction site are to be protected from sediment entering the storm water system. Inlet protection measures must be installed before entry into any storm drain.

Storm Inlet Protection

Storm inlet protection provides temporary sediment control barrier to storm inlets.

• Inlet protection is to be placed prior to the start of construction on any new or existing inlets.

• Drop in or manufactured inlet filters are to be installed per manufacturer recommendations.

• Drop-in inlet protection using silt fence fabric only is not sufficient.

• Inlet protections are to be installed in accordance with the detail in the Appendix and the Illinois

Urban Manual Standard 861 and 862.

Inlet protection is to be inspected in accordance with this SWPPP document. The inspection must verify installation per spec, check sediment load and identify any breach in the filter or straw. Maintenance will include removing any sediment and repairing or replacing when necessary. Sediment accumulation adjacent to the protection measure must be removed by the end of the following business day.

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Culvert Inlet Protection

Culvert Inlet Protection consists of baled straw, rolled excelsior or stone (where applicable) to prevent sediment from accumulating in or being transferred by new and existing culverts.

• Culvert inlet protections are to be placed prior to the start of construction on any new or existing culverts.

• Stone culvert inlet protection to be combined with silt fence, where applicable.

• Stone Culvert Inlet Protection is appropriate for drainage areas up to 3 acres.

• The rock used for the temporary stone culvert inlet protection may be used for permeant embankment stabilization if it meets the quality and size designated in the plans.

• Culvert Inlet Filters are to be installed in accordance with the detail in the Appendix and the

Illinois Urban Manual Standard 808.

Culvert inlet protection is to be inspected in accordance with The Inspection Section of this SWPPP document. Inspection will include verification of proper installation and maintenance in accordance with this document. Inspection shall check sediment load and identify any breach in the material.

Maintenance will include removing any sediment once accumulation has reached one-half of the height.

Baled straw, excelsior, stone or fabric shall be repaired and replaced when necessary.

3.5 DEWATERING PRACTICES

Water removed from the site including stormwater discharged from excavations, trenches, foundations, vaults, and other similar points of accumulation must be first filtered prior to release from the project limits. All outlets for dewatering discharges should be stable and protected from erosion. Discharges from dewatering must be free of visible floating solids, foam, or oily sheen. Dewatering practices are to be installed in accordance with the Illinois Urban Manual Standard 813.

Filter Bags

Intermittent discharges from dewatering operations must first be processed in a permeable filter bag attached to the end of the pump, surrounded with a secondary stabilized discharge area.

• The filter bags shall be attached to all pumping discharges during dewatering operations.

• The filtration bags will be installed and sized per manufacturer recommendations.

• The largest size pump to be used with a filtration bag shall be 4-inch diameter.

• Do not place dewatering controls on slopes steeper than 15% grade.

Dewatering operations will be monitored and maintained so that discharge is filtered prior to leaving the site. Maintenance may include emptying a bag per manufacturer instructions. Damaged filter bags must be replaced immediately.

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3.6 ESTABLISH STABILIZED CONSTRUCTION EXITS

Stabilized Construction Entrance

A stabilized construction entrance is a paved or rock surface provided at the exit(s) of the construction site to reduce the amount of mud/sediment transported off-site on the tires of vehicles. The construction exit removes mud from the tires before the vehicle enters public roads.

• The stabilized construction entrance will be established prior to the start of construction.

• The stabilized construction entrance shall be constructed at select locations where construction traffic enters and exits the project site.

• The aggregate used for the temporary entrance may be utilized for the final roadway if it meets the project profile and specifications.

• The stabilized construction entrance shall be installed according to the details in the Appendix and the Illinois Urban Manual Standard 930.

The construction entrances are to be inspected in accordance with The Inspection Section of this SWPPP document. The entrances/exits must be inspected to insure proper installation and maintenance per detail. Maintenance will include, but not limited to, the additional placement of rock when necessary.

Street Cleaning

If sediment is tracked onto the paved streets and sidewalks outside of the project limits, the deposited sediment shall be removed by the end of the same work day.

• Sediment track-out will be removed by sweeping, shoveling, or vacuuming of surfaces, or by using other similarly effective means of sediment removal.

• Sediment may not be hosed or swept directly into the storm sewer system unless first filtered by a BMP included in this SWPPP or similar approved BMP.

The site will be monitored daily for sediment track-out and any track-out will be removed by the end of the work day.

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3.7 DUST CONTROL

Dust Control

Control of dust blowing from exposed soil surfaces, particularly where it may cause health or traffic hazards.

• Temporary stabilization in accordance with this SWPPP can help to prevent blowing dust.

• Additional methods including irrigation and treatments may be implemented in accordance with the project specifications.

• Dust control should be achieved in accordance with the project specifications.

Maintenance

Repetitive treatment should be applied to maintain continued dust control.

3.8 STABILIZATION METHODS

The site shall be seeded or sodded to stabilize the soil by reducing raindrop impact and reducing flow velocity. See the Final Stabilization section for timing requirements in accordance with the General

Permit.

Mulch IDOT Method 2

Application of stabilized straw to exposed soil to act as a protective layer against erosion and retain moisture content.

• Straw must be stabilized in areas prone to wind or traffic displacement.

• Straw must be stabilized (Method 2) on slopes steeper than 1V:10H.

• Mulch Method 2 is not appropriate for slopes steeper than 1V:4H or in areas of concentrated flow.

• May be used in combination with seeding.

• Mulch must be installed in accordance with Illinois Department of Transportation Standard

Specifications for Road and Bridge Construction (April 1, 2022) Section 251.

Mulch must be replaced if displaced prior to final stabilization.

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Mulch IDOT Method 3

Application of straw combined with a stabilizing tackifier to exposed soil to act as a protective layer against erosion and retain moisture content.

• Mulch method 3 is appropriate for low traffic areas.

• Mulch method 3 should not be applied to frozen ground.

• Mulch Method 3 is not appropriate for slopes steeper than 1V:3H.

• May be used in combination with seeding.

• Additional erosion control practices may be required during the 12 to 24 hour drying time for hydraulic mulch.

• Mulch must be installed in accordance with Illinois Department of Transportation Standard

Specifications for Road and Bridge Construction (April 1, 2022) Section 251.

Mulch must be replaced if displaced prior to final stabilization.

Temporary Seeding

The temporary stabilization will help reduce runoff and erosion until permanent vegetation is established. Temporary stabilization will be required over any region that will remain temporarily inactive for a period of greater than fourteen (14) calendar days. Temporary seeding may be used in lieu of permanent seeding when earth disturbing activities will resume after fourteen (14) calendar days.

Areas requiring temporary stabilization shall be seeded no more than seven (7) days after construction activity has stopped.

• Temporary seed mixture shall be applied in accordance with the IDOT Standard Specifications for IDOT Class 7 Seed Mix.

• In order for an area or stockpile to be temporarily stabilized, seed must germinate, grow, and provide a minimum of 70% vegetative density. When land is used for agricultural purposes, stabilization may be accomplished by returning disturbed land to its preconstruction agricultural use.

• If stabilization is precluded by snow cover, temporary seeding must occur as soon as practicable.

Should project scheduling prohibit the ability to seed within the planting dates specified in the

Standard Specification, contractor shall employ alternate source controls to insure 70% coverage after the period of establishment. Cold weather seeded areas are to be mulched within 24 hours. Soil must be prepared prior to freezing. Seeding should be established prior to the suspension of construction activities for winter months.

Inspections must occur at least in accordance with the Inspection Section of this SWPPP document.

Areas must be watered, fertilized, and reseeded as needed to maintain a minimum of 70% vegetative density.

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Permanent Seeding

Permanent stabilization using mulch, seed mixes and sod will be provided immediately after the completion of all other construction events, no more than fourteen (14) days after construction in a portion of the site has permanently ceased.

• Disturbed areas shall be stabilized with mulching, seeding or sod within fourteen (14) days of completion of disturbance and grass sown as necessary to re-establish vegetation for control of siltation and soil erosion.

• If weather conditions are outside the seeding range in the project plans and/or specifications, contractor must provide alternative stabilization until such time that permanent seeding can be established.

• Installation shall be in accordance with the project plans.

Inspections must occur at least in accordance with this SWPPP document. Maintenance includes watering, fertilizing, and reseeding as needed to maintain a minimum of 70% vegetative density. Once construction is complete, the permanent stabilization will be monitored until final stabilization is reached. Final stabilization is reached when 70% of the ground cover is permanently stabilized. When land is used for agricultural purposes, final stabilization may be accomplished by returning disturbed land to its preconstruction agricultural use.

Hydroseeding

Application of seed in a slurry mix, especially useful in areas difficult to reach with standard equipment.

• Seedbed soil surface shall be slightly roughened

• Application shall have a minimum of 1000 gallons of water per acre, pumped at no less than 100 gallons per minute with a minimum of 100 pounds per square inch pressure.

• Recommended rate for inoculant shall be increased by four times with seeding legumes.

• Hydroseeding, including mulch and fertilizer, shall be installed in accordance with the Illinois

Department of Transportation Standard Specifications for Road and Bridge Construction (April 1, 2012) Section 250.

Inspections must occur at least in accordance with this SWPPP document. Equipment shall be properly calibrated and maintained in accordance with manufacturer's instructions. Maintenance includes watering, fertilizing, and reseeding as needed to maintain a minimum of 70% vegetative density. Once construction is complete, the seeding will be monitored until final stabilization is reached. Final stabilization is reached when 70% of the ground cover is permanently stabilized. When land is used for agricultural purposes, final stabilization may be accomplished by returning disturbed land to its preconstruction agricultural use.

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3.9 PERMANENT EROSION CONTROLS

Rock Riprap Outlet Protection

Rock Riprap Outlet Protection prevents erosion at the outlet of storm pipes by slowing the velocity of concentrated flows and armoring the soil around the outlet.

• See construction plans for the size and quality of riprap at each outlet.

• Installation shall be in accordance with the Illinois Urban Manual Standard 910 and Detail 610 or

611, as applicable.

During construction, inspection must occur at least in accordance with The Inspection Section of this

SWPPP document. Maintenance will include the removal of debris and the replacement of dislodged riprap.

3.10 GOOD HOUSEKEEPING

Construction sites shall store and manage materials to minimize the risk of hazardous contact with rainfall, runoff or stormwater.

Concrete Washout Area

Areas shall be designated to washout equipment using concrete mixes, paint, stucco, or other materials hazardous to storm water. A concrete washout facility should be used on any project site utilizing concrete. The device is used to manage the liquid and solid wastes generated by concrete construction.

• Install in a location with stabilized vehicular access and is protected from damage.

• Washout facility shall be located a minimum of 50 feet from storm drain inlets and open waterways. In the event that site constraints make this distance impractical, the facility shall be located as far away as possible.

• Installation in accordance with the Illinois Urban Manual Practice Standard 954 and Drawing

IUM-654SB (included in the Appendix), IUM-564BW or IUM-654ET.

• When the washout area is no longer required, the BMP must be completely removed and the ground restored.

Concrete Washout Areas shall be inspected daily and in accordance with The Inspection Section of this document. Inspection will include checking for leakage and capacity. Concrete Washout Areas shall be maintained if the level of liquids and/or solids are nearing two-thirds to the top of the facility.

Washout water may be allowed to evaporate. For facilities with volume impractical to evaporate, washout water shall be collected and properly disposed. Washout water shall not be discharged into the environment. Solid concrete waste shall be disposed of in accordance with Illinois Environmental

Protection Act (415 ILCS 5) for Clean Construction or Demolition Debris.

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Wash Water Control

In accordance with IV.D.2.f.ii of the General Permit (see Appendix), contractor must minimize the discharge of pollutants from wash waters including from equipment, vehicle, wheels or others. Wash waters must be treated in a sediment trap or equivalent treatment prior to discharge. See “Concrete

Washout Area” for the treatment of wash water from concrete trucks.

• All equipment and vehicle washing to be performed off-site whenever possible.

• Use biodegradable, phosphate-free, water-based detergents.

• Limit the amount of detergents used on site.

• Use vacuums and blowers to remove dry materials.

• Designate a paved area on site for washing only. Water should be directed to a treatment BMP.

• If applicable, water contaminated with oils, gas, solvents, or other chemicals should be taken off-site for proper disposal.

• Any wash water used on site must be treated in a Temporary Sediment Trap per IUM Code 960 or equivalent BMP. For drainage areas between 5 and 30 acres, see IUM Code 957 for

Temporary Sediment Basin.

Any BMP accepting wash water should be maintained according to this document and the Illinois Urban

Manual. Location and use of designated wash areas should be communicated to new workers through out the construction.

Chemical Usage and Storage

All chemicals, soaps or detergents shall be used and stored in a manner reducing likelihood of exposure to stormwater or release as runoff. Chemicals may include fuel, oil, hydraulic fluids, petroleum products, solvents, detergents, pesticides, herbicides, building materials, and other products.

• Material safety data sheets shall be available at the job site.

• All chemicals to be labeled and stored is stable area where there is no exposure to precipitation.

• All polymer flocculants or treatment chemicals shall be identified.

• Any chemical container equal to or larger than 55 gallons must be stored a minimum of 50 feet from a body of water, swale, or storm inlet. If 50-foot setback is not feasible, additional containment and protection is required and must be documented with this SWPPP.

• See Spill Prevention and Control Plan for additional information.

Availability of data sheets and written procedures shall be verified weekly throughout construction. All

Material storage areas shall be checked for leaks, damage, or open containers during inspection.

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Spill Prevention and Control Plan

Construction site shall be equipped with the property equipment to contain and clean any spills of hazardous materials. Hazardous materials will be stored in accordance federal, state and local guidelines.

• Spill prevention and control procedures shall be implemented as soon as construction starts.

• All personnel shall be trained in the spill prevention and clean up procedures.

• Accidental spills of materials must be immediately cleaned. Material spills shall be immediately stopped at the source, contained to protect drainage features, and removed material property disposed.

• Spill kits shall be stored onsite within reach of the material storage area.

• Spills discharging to a surface water shall be reported. See Appendix for the Illinois Emergency

Management Agency Emergency Release Notification information.

• Material safety data sheets, a material inventory, and emergency contact information

Shall be available at the job site.

Spill kits shall be replaced immediately if used. Availability of data sheets and written procedures shall be verified weekly throughout construction. All Material storage areas shall be checked for leaks or damage during inspection.

Waste Disposal

All waste materials, including trash and construction materials, shall be collected in a timely manner and stored securely until collection and disposal. Receptacles shall be covered to shield debris from dispersal by wind and rain. All collected trash and construction debris shall be removed from site and disposed of properly and legally.

• No solid materials shall be discharged to the receiving waters.

• Dumpster(s) or trash receptacle(s) to be installed at the start of construction.

• Dumpster(s) or trash receptacle(s) must have a secure and watertight lid.

• No construction materials shall be buried on-site.

• All personnel will be instructed and trained on the proper disposal of trash and construction debris.

• All waste disposal shall comply with State and Local waste disposal, sanitary and septic regulations. (General Permit IV.D.2.g.ii)

• Regulated hazardous or toxic waste must be stored and disposed in accordance with applicable

State and Federal regulations. (General Permit IV.D.2.g.v)

Waste disposal practices are to be inspected in accordance with this SWPPP document. Inspection will include verification that trash and debris are collected regularly, and that construction dumpster(s) / waste receptacle(s) are emptied regularly. If the waste and debris are exceeding capacity, the receptacles must be emptied more frequently.

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4.0 MAINTENANCE

All maintenance of erosion control systems will be the responsibility of the Contractor. All protection measures identified in the plan shall be kept in good and effective operating condition. Maintenance schedule shall be in accordance with the General NPDES Permit No. ILR10. Repairs to nonfunctioning protective measures will be required throughout construction, including during the winter months, snowmelt conditions and rain days.

During construction, the Contractor shall:

• Clean up and grade the work area to eliminate concentrated areas of runoff.

• Cover the open ends of pipes in trenches at the close of each working day.

• Maintain or replace erosion control and sediment control items.

• Prior to any landscaping/restoration work, the Contractor shall remove and dispose of silt retained by temporary ditch checks and reinstall temporary ditch checks after cleaning.

• Remove and replace plugged hay or straw bales.

All locations where vehicles enter and exit the construction site and all other areas subject to erosion should also be inspected periodically. Inspection of these and other areas shall be made in accordance with this document. The contractor shall clean the adjacent roadways daily if any dirt or debris is tracked onto the adjacent roadway. Flushing dirt or debris into inlets, catch basins or storm sewers will not be permitted.

5.0 INSPECTIONS

5.1 INSPECTION PERSONNEL AND CONTACT INFORMATION

The contractor is responsible to provide qualified personnel to conduct inspections in accordance with the provisions of the NPDES Permit Number ILR10, issued by the Illinois Environmental Protection

Agency. The General Permit is included in the Appendix for reference.

Contact information for Inspection Personnel:

Contact Name:

Title:

Company:

Phone Number:

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5.2 INSPECTION SCHEDULE AND PROCEDURES:

Qualified personnel shall inspect the construction site at least at the following frequency:

Inspection Frequency:

MINIMUM INSPECTION FREQUENCY:

• Once every seven (7) calendar days

• Once per month when construction activities have ceased due to frozen conditions. Minimum weekly inspections will recommence with any construction activity on the site.

AFTER RAIN OR SNOW FALL:

• After a 0.50 inch or greater rainfall (or equivalent snow fall), within 24 hours of the end of a storm or by the end of the following business/workday.

When areas are inaccessible due to flooding or other unsafe condition, inspection shall occur within 72 hours of becoming accessible. (Document inspection delay in inspection report.)

Areas of the construction site to be inspected include:

• Disturbed areas and areas used for storage of material that are exposed to precipitation shall be inspected for evidence of, or the potential for, pollutants entering the drainage system.

• Erosion and sediment control measures identified in this plan shall be observed to ensure that they are operating correctly.

• Where discharge locations or points are accessible, they shall be inspected to confirm effectiveness in preventing significant impacts to receiving waters.

• Locations where vehicles enter or exit the site shall be inspected for evidence of offsite sediment tracking.

• Dewatering discharge points including observable clarity and color of water.

• All areas where stormwater typically flows must be inspected for potential pollutants entering the drainage system.

• All locations where stabilization measures have been implemented shall be observed for proper vegetation growth and confirm continued stabilization.

Based on the results of the inspection, the description of potential pollutant sources identified in this plan and pollution prevention measures identified shall be revised as appropriate as soon as practicable after inspection. Such modification shall provide for timely implementation of any changes to the plan within seven (7) calendar days following the inspection.

See SWPPP Documentation Section for inspection report requirements.

5.3 DETERMINING RAINFALL AMOUNTS

Rainfall amounts may be taken from an onsite rain gauge or based on data from the National Weather

Service Website for the gauge nearest the project site. www.weather.gov

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6.0 REQUIRED DOCUMENTATION

This Storm Water Pollution Prevention Plan document including associated documentation, plans and manuals must be retained at the construction site from the date of project initiation to the date of final stabilization. Sample forms for use are included in the Appendix. Completed documentation should be added to the Appendix at the end of this document.

This SWPPP document, including all inspections, reports and additional documentation must be retained for a period of at least 3 years. All documentation must be made available to the public within 30 days upon request. If documentation cannot be provided in 30 days, a documented statement explaining why the documentation cannot be provided must be submitted. Confidential portions of the SWPPP may be redacted.

6.1 RECORD OF LAND DISTURBING ACTIVITIES

A record of all land disturbing activities shall be recorded and kept with the SWPPP document throughout the life of the project. Dates and locations within the project shall be logged anytime major grading activities start, when construction activities temporarily or permanently cease, when stabilization measures are initiated and when final stabilization is reached. Plan references or a plan mark up may be included for reference. A sample log for use is included in the Appendix.

6.2 INSPECTION REPORT

A report summarizing the scope of each inspection, name and qualifications of personnel making the inspection, the date(s) of the inspection, major observations relating to the implementation of the storm water pollution prevention plan, and actions taken shall be made and retained as part of the storm water pollution prevention plan for at least three years from the date that the permit coverage expires or is terminated. All inspection reports shall be retained at the construction site. Sample inspection report forms are included in the Appendix.

6.3 CORRECTIVE ACTION LOG

Any actions taken including to repair excessive erosion or discharges shall be noted in the Corrective

Action Log in the Appendix. Corrective actions requiring a Corrective Action Form are defined in the

General Permit and include the following:

• Repair or replacement of stormwater control

• Stormwater control was not installed or installed incorrectly

• Discharges are exceeding water quality standards

• Prohibited discharges

• Repair, replacement or other action for the failure of the same control at the same location three or more times (General Permit IV.D.5)

Section A, the Initial Report, shall be completed within 24 hours of discovering the condition. Section B, Corrective Action Progress, shall be completed no later than 7 calendar days after discovering the condition. If it is infeasible to complete the corrective action within the timeframe, documentation including the justification for delay and proposed schedule for implementation as soon as feasible after the required time frame.

FARNSWORTH GROUP / 24

6.4 INCIDENCE OF NON-COMPLIANCE

In the event of an incident that will endanger the health or the environment, the permittee shall notify the appropriate Illinois Environmental Protection Agency Field Operations Section office.

• Email at: epa.swnoncomp@illinois.gov

• telephone or fax within 24 hours of any incidence of non-compliance for any violation of the storm water pollution prevention plan during any inspection conducted, or for violations of any condition of the Illinois General NPDES permit. The permittee shall complete and submit within

5 days an “incidence of non-compliance” (ION) report for any violation of the storm water pollution prevention plan observed during any inspection conducted, or for violations of any condition of the Illinois General NPDES permit. Submission shall be on forms provided by the

Illinois Environmental Protection Agency and include specific information on the cause of non-compliance, actions which were taken to prevent any further causes of non-compliance, and a statement detailing any environmental impact, which may have resulted from the non-compliance.

All reports of noncompliance must be signed by a responsible authority as defined in the General

Permit.

After the initial contact has been made with the appropriate Agency Field Operations

Section Office, all reports of non-compliance shall be mailed to the Agency at the following address:

Illinois Environmental Protection Agency

Division of Water Pollution Control

Compliance Assurance Section

1021 North Grand Avenue East

Post Office Box 19276

Springfield, Illinois 62794-9276

6.5 LOG OF CHANGES TO THE SWPPP

Any changes to this SWPPP document should be documented in the SWPPP Change Log in the Appendix of this document. Changes may include the addition of new BMPs, replacement of failed BMPs, significant changes in the activities on the project, changes in personnel, changes in inspection and maintenance procedures, and updates to site maps. Modifications made to the SWPPP as a result of an inspection must be completed within 7 days of inspection.

6.6 RECORD OF DEWATERING ACTIVITIES

When sites are discharging dewatering water, inspection and documentation of inspection of the discharge location must occur at least once per day when discharge occurs. Dewatering activities must be logged including the date of discharge, the time dewatering activities started and ended, estimate of rate of discharge and observations of the discharge water. Inspection should note any observed sediment plume, suspended solids, unusual color, presence of odor, decreased clarity, presence of foam, visible sheen in the water, or visible oily deposits on the shore. A sample dewatering log, to be used in conjunction with the Inspection Form, is included in the Appendix.

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6.7 NOTICE OF TERMINATION

A Notice of Termination (N.O.T.) must be submitted to the Illinois Environmental Protection Agency upon completion of the soil disturbing activities. Prior to submitting the N.O.T., the site must be completely Stabilized in accordance with the Stabilization Section of this document, all temporary erosion controls must be removed and collected silt properly disposed. The Notice of Termination form is included in the Appendix. The Notice of Termination may be submitted electronically through the

IEPA’s permitting system by contacting the party submitting the Notice of Intent to Construct.

7.0 SITE STABILIZATION

7.1 STABILIZATION TIMELINE

Stabilization measures should be initiated within one (1) working day of the cessation of land disturbing activities.