State Revolving Fund Loan Programs Drinking Water, … ch8 EA 11.5.2018.pdf · [email protected] State Revolving Fund Loan Programs Drinking Water, Wastewater, Nonpoint Source

ENVIRONMENTAL ASSESSMENT AND

FINDING OF NO SIGNIFICANT IMPACT

CITY OF FORT WAYNE PRELIMINARY ENGINEERING REPORT

2018 Wastewater Improvements

Chapter 8 - CSO 32 & Third Street Pump Station Consolidated Sewer Project

STATE REVOLVING FUND PROJECT # WW 18 20 02 12

DATE: October 5, 2018

TARGET PROJECT APPROVAL DATE: November 5, 2018

I. INTRODUCTION

The above entity has applied to the Wastewater State Revolving Fund (SRF) Loan Program for a loan to

finance all or part of the wastewater project described in the accompanying Environmental Assessment (EA).

As part of facilities planning requirements, an environmental review has been completed which addresses

the project's impacts on the natural and human environment. This review is summarized in the attached EA,

which can also be viewed in color at http://www.in.gov/ifa/srf/.

II. PRELIMINARY FINDING OF NO SIGNIFICANT IMPACT (FNSI)

The SRF Wastewater Program has evaluated all pertinent environmental information regarding the proposed

project and determined that an Environmental Impact Statement is not necessary. Subject to responses

received during the 30-day public comment period, and pursuant to Indiana Code 5-1.2-3, it is our

preliminary finding that the construction and operation of the proposed facilities will result in no significant

adverse environmental impact. In the absence of significant comments, the attached EA shall serve as the

final environmental document.

III. COMMENTS

All interested parties may comment upon the EA/FNSI. Comments must be received at the address below

by the target approval date above. Significant comments may prompt a reevaluation of the preliminary FNSI;

if appropriate, a new FNSI will be issued for another 30-day public comment period. A final decision to

proceed, or not to proceed, with the proposed project shall be effected by finalizing, or not finalizing, the

FNSI as appropriate. Comments regarding this document should be sent within 30 days to:

April Douglas

Senior Environmental Manager

State Revolving Fund

100 N. Senate Ave. IGCN 1275

Indianapolis, IN 46204

317-234-7294

[email protected]

State Revolving Fund Loan Programs Drinking Water, Wastewater, Nonpoint Source

SRF Clean Water Program Page 2 of 16

City of Fort Wayne Environmental Assessment: Chapter 8 - CSO 32 & 3rd Street Pump Station Consolidated Sewer Distributed October 5, 2018 for 30-day comment period to the public.

I. PROJECT IDENTIFICATION

Project Name and Address: 2018 Wastewater Improvements

Chapter 8 - CSO 32 & Third Street Pump Station

Consolidated Sewer Project

City of Fort Wayne

200 East Berry Street, Suite 270

Fort Wayne, IN 46802

SRF Project Number: WW 18 20 02 12

Authorized Representative: Kumar Menon, Director of Public Works and Utilities

II. PROJECT LOCATION

The project is located on the Fort Wayne West Quadrangle Map, Wayne Township, Township

30 North, Range 12 East, Section 2 and on the north side of the Saint Mary’s River, in the Heirs of

Captain Wells area, see Figure 1. The project is located near downtown Fort Wayne, commencing at

the intersection Third St. and N. Calhoun, paralleling and then crossing the St. Mary’s River just east

of S. Harrison St., and then paralleling the river north to Drop Shaft 9.

III. PROJECT NEED AND PURPOSE

Fort Wayne City Utilities (FWCU) has entered into a Consent Decree with the U.S. EPA, Department

of Justice, and Indiana Department of Environmental Management (IDEM) to implement a combined

sewer overflow (CSO) Long Term Control Plan (LTCP) to reduce the volume of combined sewage

that is discharged into the waterways within the City of Fort Wayne.

IV. PROJECT DESCRIPTION

The 2018 Wastewater Utility Improvements, Chapter 8 – CSO 32 & Third Street Pump Station

Consolidated Sewer Project includes the construction of approximately 1,400 feet of 54- through

84- inch diameter sanitary sewer main, a diversion structure, a 96-inch diameter manhole, a 120- inch

diameter drop manhole, a bar screen structure, a flow meter vault, a junction chamber and a concrete

approach channel structure, with a vortex flow insert at the junction chamber.

ENVIRONMENTAL

ASSESSMENT



V. ESTIMATED PROJECT COSTS, AFFORDABILITY AND FUNDING

A. Selected Plan Estimated Cost Summary

Construction Costs

3rd St Pump Station Consolidated Sewer $ 4,650,000

Contingencies 465,000

Total Construction Costs $5,115,000

Non-Construction Costs

Construction Management and Inspection $ 360,000

Legal and Financial 175,000

Non-Construction Cost $ 535,000

Total Project Costs $ 5,650,000

B. Total cost of this project is estimated to be approximately $5,650,000. The City of Fort Wayne will

finance the project with a loan from the SRF Loan Program for a term and annual fixed interest rate

to be determined at loan closing. Monthly user rates and charges may need to be analyzed to

determine if adjustments are required for loan repayment.

VI. DESCRIPTION OF EVALUATED ALTERNATIVES

The “No Action” alternative is not a feasible alternative. If no action is taken, the City will not be in

compliance with its LTCP or Consent Decree.

Optimal Operation of Existing Facilities: This is not a feasible alternative to achieve compliance

with the recommendations in the LTCP and the requirements of the Consent Decree. The City of Fort

Wayne operates the combined sewer system as effectively as possible with continual observation and

maintenance.

Collection System Rehabilitation/Replacement: Rehabilitation of the existing sewers will not fully

address the problems with reduction of CSO to the River. Because the collection system is a combined

system, rehabilitation will not eliminate the overflows. Sewer separation in the combined sewer areas

was evaluated in the LTCP and was not affordable.

New Collection System/Interceptor Routes and Alternatives: Several options were considered for

the mitigation of the overflows from outfall nos. 32 and 33. The LTCP recommended construction of

3RPORT and the consolidated sewers. Several alternative routes were considered for this consolidation

sewer, and the route with the least expensive construction cost is the selected alternative.

Phasing: The project is part of the phasing in the LTCP to relieve surcharging in the interceptor sewers

and reduce the number of overflows.



VII. ENVIRONMENTAL IMPACTS OF THE FEASIBLE ALTERNATIVES

A. Direct Impacts of Construction and Operation

Disturbed/Undisturbed Land: None of the proposed work elements will alter the land use of the

surrounding areas. Some of the construction will occur on land that appears to be undisturbed. A

copy of the archaeological report was submitted to the State Historic Preservation Officer under

separate cover.

Structural Resources (Figure 2): One historical bridge is identified within the vicinity of the

proposed construction. The bridge will not be impacted by the construction of the proposed sewers.

Construction and operation of the project will not alter, demolish or remove historic properties. If

any visual or audible impacts to historic properties occur, they will be temporary and will not alter

the characteristics that qualify such properties for inclusion in or eligibility for the National

Register of Historic Places. The SRF’s finding pursuant to Section 106 of the National Historic

Preservation Act is: “no historic properties affected.”

Surface Waters: The Saint Mary’s River will be temporarily affected by the installation of a

consolidation sewer via open cut. A sewer this large cannot be directionally drilled. The soil

borings for the Harrison Street bridge mentioned the presence of boulders. Encountering a boulder

could mean the Contractor would have to rescue the machine with open cut anyway. Also, with

the microtunnel, the crossing needs to be 7 feet deeper. Therefore, the sewers on the south side of

the river would need to be installed 7 feet deeper, also increasing the cost. Sediments at the site

consist mostly of clayey silty sand. Silt fences will be installed along the river’s edge.

A cofferdam dam will be constructed to dam up half of the river at a time. The work will be done

during low flow. If by chance the river’s water level overtops the sheeting, the work site will be

allowed to flood. It will be dewatered once the river’s water level goes back down.

The project will temporarily affect the Saint Mary’s River which is not listed as an outstanding

state resource waters listed in 327 IAC 2-1.3-3(d), exceptional use streams listed in 327 IAC 2-1-

11(b), Natural, Scenic and Recreational Rivers and Streams listed in 312 IAC 7-(2), or Salmonid

Streams listed in (327 IAC 2-1.5-5(a)(3) or streams on the Outstanding River List for Indiana.

Floodplain (Figure 3): Portions of the project are being constructed in the 100-year flood plain.

There will not be any above-grade structures as a result of this construction, and the construction

will be in accordance with permit requirements.

Wetlands (Figures 3 and 4): Wetlands will be impacted as a result of the proposed construction.

Figure 3 provides an aerial view of the proposed improvements with the identified wetlands and

flood plains shown. The construction of the sewer under the St. Mary’s River is anticipated to be

installed using open-cut construction.

The City is working with the Parks Department in this area as compensatory mitigation for

discharging fill material into a wetland for the St. Mary’s Riverfront Redevelopment Project.

The Parks Department received a Section 401 Water Quality Certification for work in this area

which was provided to USFWS along with the off-site stream mitigation for this project as

shown in Figure 4.

A Section 401 Water Quality Certification dated September 20, 2017 states that the St. Mary’s

Riverfront Redevelopment Project will: discharge fill material into 0.2615 acre of Wetland A

permanently for the construction of an elevated boardwalk and trails and a portion of a new

seawall on the north bank of the St. Mary’s River. An additional 0.1650 acre of Wetland A will

be temporarily impacted during the construction of the project. Along the north bank, 537 linear



feet of glacial stone and concrete seawall will be constructed. Additionally, a temporary

cofferdam will be installed, impacting 250 linear feet of the north bank to be removed and restored

upon completion of construction. Along the south bank, a concrete and glacial stone seawall will

be constructed, impacting 459 linear feet of the river. All impacts are associated with the St.

Mary’s Riverfront Redevelopment Project. As compensatory mitigation you propose stream bank

and riparian habitat enhancement along 740 linear feet of the St. Mary’s River and 1.54 acres of

riparian habitat. Wetland mitigation will be constructed off-site within the same 8-digit watershed

consisting of 0.9835 acre of forested wetland in Section 3, Township 30 North, Range 12 East in

Fort Wayne, Indiana, Allen County. The off-site mitigation is located north of the intersection of

Covington Street and Filmore Street in Fort Wayne, Indiana.

Groundwater: Groundwater will not be impacted by the construction or operation of the proposed

project.

Plants and Animals: The Preliminary Engineering Report (PER) states: Some wooded, scrub or

shrub areas are in the locations of the proposed project. Approximately twenty trees will need to

be removed for the construction of the relief sewer in addition to scrub areas being cleared. A

maximum 50-foot wide construction easement will be required for this project

The project will be implemented to minimize the impact to non-endangered species and their

habitat. Mitigation measures will be implemented as requested by the Indiana Department of

Natural Resources and the U.S. Fish and Wildlife Service.

Prime Farmland: The project will not convert prime farmland.

Air Quality: The area is in compliance with ozone and other airborne pollutants. This project will

not introduce any additional pollutants into the atmosphere. Malodorous fumes and gases will not

be discharged into the air as a result of the construction activities or the operation of the proposed

work. The construction and operation of this work will not adversely affect ozone levels and will

not increase or decrease airborne pollutants.

Short-term negative impacts to air quality will include noise and dust during the construction

period. There will be no long-term negative impacts to air quality. The contractor will be required

to maintain all equipment in good working order to mitigate noise and air pollution caused by

faulty operating equipment. If dust becomes an issue, the contractor will be required to water the

construction zones to keep airborne particulate to a minimum.

Open Space and Recreational Opportunities: The proposed pipe will be installed adjacent to

and crossing a portion of the Fort Wayne Parks Department Trail System. Sections of the trail will

be closed during construction. The trail will be restored at the conclusion of the construction.

Lake Michigan Coastal Program: The project will not affect the Lake Michigan Coastal Zone.

National Natural Landmarks: Construction and operation of the proposed project will not affect

National Natural Landmarks.

B. Indirect Impacts

The city’s PER states: The City of Fort Wayne through the authority of its Council planning

commission, or other means, will ensure that future development, as well as future collection

system or treatment works projects connecting to SRF funded facilities will not adversely affect

wetlands, wooded areas, steep slopes, archaeological/historical/structural resources, or other

sensitive environmental resources. The City will require new development and treatment works



projects to be constructed within the guidelines of the U.S. Fish and Wildlife Service, IDNR, IDEM,

and other environmental authorities.

C. Comments from Environmental Review Authorities

In correspondence dated September 10, 2018, the Indiana Department of Natural Resources

Division of Historic Preservation and Archaeology stated:

Pursuant to IC 13-18-21 and 327 IAC 14 and Section 106 of the National Historic

Preservation Act (54 U.S.C. § 306108) and 36 C.F.R. Part 800, the Indiana State Historic

Preservation Officer ("Indiana SHPO") is conducting an analysis of the materials dated and

received by the Indiana SHPO on August 9, 2018, for the above indicated project in Fort

Wayne, Allen County, Indiana.

In regard to buildings and structures, we have identified the following property listed in the

National Register of Historic Places within the probable area of potential effects:

Fort Wayne Park and Boulevard System Historic District, listed December 28, 2010

However, based on the information provided to our office, we do not believe that the

characteristics that qualify the above identified historic property for inclusion in the National

Register will be diminished as a result of this project.

In regard to archaeology, there are no currently known archaeological resources listed in or

eligible for the National Register of Historic Places within the proposed project area.

If any prehistoric or historic archaeological artifacts or human remains are uncovered during

construction, demolition, or earthmoving activities, state law (Indiana Code 14-21-1-27 & 29)

requires that the discovery must be reported to the Department of Natural Resources within

two (2) business days. In that event, please call (317) 232-1646. Be advised that adherence to

Indiana Code 14-21-1-27 & 29 does not obviate the need to adhere to applicable federal

statutes and regulations, including but not limited to 36 C.F.R. Part 800.

In correspondence dated August 31, 2018, the United States Fish and Wildlife Service stated:

This responds to your letter dated August 9, 2018, requesting our comments on the

aforementioned project.

These comments have been prepared under the authority of the Fish and Wildlife Coordination

Act (16 U.S.C. 661 et. seq.) and are consistent with the intent of the National Environmental

Policy Act of 1969, the Endangered Species Act of 1973, and the U.S. Fish and Wildlife Service's

Mitigation Policy.

The proposed project is a consolidation sewer to take combined sewer flows to the 3PORT,

which is a deep tunnel used to collect and hold storm and sewer waters and convey them to the

sewage treatment plant. Flows from CSOs 027, 032, and 033, which currently discharge to the

St. Marys River in downtown Fort Wayne, will be directed to the new pipe constructed on land

between Third Street/North Calhoun Street (location of CSOs 27 and 33) and the North Harrison

Street bridge; from there it will turn south to cross the St. Marys River and collect flows from

Shaft 9 within Headwaters Park. The sewer under the St. Marys River is anticipated to be

installed using the open-cut method.

A wetland delineation along the north bank of the St. Marys River determined that there is a

0.77 Palustrine forested wetland within the floodplain. A portion of this wetland near the North

Harrison Street bridge would apparently be impacted by the construction of the sewer across



the river, but the amount of impact is not discussed in the documents; it is simply stated that

about 20 trees would need to be removed and that the sewer right-of-way would be a maximum

of 50 feet wide.

Additional information on the impacts on the forested wetland is needed, including any

relationship with other developments planned for the same area. Also, there needs to be an

explanation why the sewer across the river would utilize open-cut construction rather than

horizontal directional drilling, which would not disturb the riverbed. What is the composition

of the riverine sediments at the site (e.g. silt, sand) and what measures will be taken during

construction to protect water quality; will cofferdams be utilized so that the work is done in the

dry, with the river flow being flumed past the construction site? Will the construction take place

during low water conditions, and what consequences will be in place in case of heavy rainfall

and a rapid rise in water elevation?

Endangered Species

The proposed project is within the range of the federally endangered Indiana bat (Myotis

sodalis) and rayed bean mussel (Villosa fabilis), and the threatened northern long-eared bat

(Myotis septentrionalis), and eastern massasauga rattlesnake (Sistrurus catenatus). There is no

habitat for any of these species within the proposed project area. Therefore we agree that the

proposed project is not likely to adversely affect these endangered and threatened species.

This precludes the need for further consultation on this project as required under Section 7 of

the Endangered Species Act of 1973, as amended. However, should new information arise

pertaining to project plans or a revised species list be published, it will be necessary for the

Federal agency to reinitiate consultation.

The City of Fort Wayne responded to the questions posed by USFWS on September 7, 2018 by

stating that:

The City is working with the Parks Department in this area as compensatory mitigation for the

St. Mary’s Riverfront Redevelopment Project as described in the wetlands section above, and

shown in Figure 4. The Parks Department received a Section 401 Water Quality Certification

for work in this area which was provided to USFWS along with the off-site stream mitigation for

this project.

The City of Fort Wayne evaluated open cut versus Mircotunnelling under the river. A sewer this

large cannot be installed via directional drilling. Soil borings for the Harrison Street bridge

mentioned the presence of boulders. Encountering a boulder could mean the contractor would

have to rescue the machine with open cut. Installation of the sewer via a microtunnel requires

the crossing to be installed 7 feet deeper, which increases the cost.

Sediments at the site consist mostly of clayey silty sand. Silt fences will be installed along the

river’s edge.

A cofferdam dam will be constructed to dam up ½ the river at a time. The work will be done

during low water levels in the river. If by chance the rivers overtop the sheeting, the work site

will be allowed to flood. It will be dewatered once the river goes back down.

In correspondence dated September 28, 2018, the USFWS stated:

Thank you for the additional information provided about this proposed project on September

7, 2018. We have also reviewed the information provided by the Fort Wayne Department of

Parks and Recreation to the Indiana Department of Environmental Management in 2017 when



applying for Clear Water Act permits for work in and adjacent to the St. Marys River in the

same general location.

These comments have been prepared under the authority of the Fish and Wildlife Coordination

Act (l6 U.S.C. 661 et. seq.) and are consistent with the intent of the National Environmental

Policy Act of l969, the Endangered Species Act of l973, and the U. S. Fish and Wildlife

Service's Mitigation Policy.

The proposed project is a consolidation sewer to take combined sewer flows to the 3RPORT,

which is a deep tunnel used to collect and hold storm and sewer waters and convey them to the

sewage treatment plant. The sewer under the St. Marys River is proposed to be installed using

the open-cut method. The additional information that was provided to us shows that various

installation methods were investigated both for costs and feasibility. Open-cut was determined

to be the least costly and most feasible due to the size of the pipe (horizontal directional

drilling is not possible with a 54-inch pipe) and the presence of scattered boulders within the

riverbed. Steel sheet cofferdams will segregate half of the river width at a time, with flow

remaining in the other portion of the river. To the extent possible, the work will be done during

low-flow conditions; sudden high flows due to extreme rain events will be allowed to enter the

area within the cofferdam, with the site being dewatered when work is able to be resumed.

Concerning the Parks Department work, the impacts are proposed along the north bank of the

river upstream from the Harrison Street bridge, whereas the sewer crossing is proposed

downstream of that bridge. The wetland and riparian woodland along the north bank in the

vicinity of the sewer crossing is to be a mitigation area for the upstream impacts. As such, the

riverbank habitat will be enhanced through the removal of invasive/non-native species and the

planting of native grasses, flowers, shrubs, and trees. The mitigation plan specifically does not

include a 100-foot wide corridor where the sewer pipe will be installed. However, the sewer

construction plans indicate that the right-of-way will not exceed 50 feet, so 50 feet of that

exclusion corridor apparently will not actually be impacted.

In correspondence dated September 7, 2018, the Department of Natural Resources Environmental

Unit stated:

The Indiana Department of Natural Resources has reviewed the above referenced project per

your request. Our agency offers the following comments for your information and in

accordance with the National Environmental Policy Act of 1969.

If our agency has regulatory jurisdiction over the project, the recommendations contained in

this letter may become requirements of any permit issued. If we do not have permitting

authority, all recommendations are voluntary.

Regulatory Assessment: This proposal will require the formal approval for construction in a

floodway under the Flood Control Act, IC 14-28-1, unless it qualifies for a general license

under Administrative Rule 312 IAC 10-5 that applies to utility line crossings (see enclosures).

Please include a copy of this letter with the permit application if the project does not meet the

general license criteria.

Natural Heritage Database: The Natural Heritage Program's data have been checked.

The Peregrine Falcon (Falco peregrinus), a state species of special concern, has been

documented within ½ mile southeast of the project area.

Fish & Wildlife Comments: The closest peregrine falcon nest to the proposed project site is

more than 2000 feet away, which is well beyond the recommended safe distance of 660 feet to

avoid impacts to the species. Therefore we do not foresee any impacts to this species as a

result of this project.



Avoid and minimize impacts to fish, wildlife, and botanical resources to the greatest extent

possible, and compensate for impacts. The following are recommendations that address

potential impacts identified in the proposed project area:

1) Directional Boring: We recommend that a trenchless method be used to cross the river.

The length of the bore should include any forested riparian areas along the river to minimize

impacts to forested habitat. Install the sewer at least 3 feet below the existing streambed

elevation, measured between the lowest point of the streambed and the top of the sewer.

Install erosion control measures such as silt fencing or other appropriate devices around

directional drilling pits in order to prevent drilling mud from leaving the immediate area of the

pit or entering the stream.

If the open-trench method is necessary and the only feasible option at any of the planned

stream crossings due to the site conditions, then the following measures should be

implemented:

a. Any open-trench stream crossing should be timed to coincide with the low-water time of

year (typically mid- to late-summer).

b. Restore disturbed streambanks using bioengineering bank stabilization methods and

revegetate disturbed banks within native trees, shrubs and herbaceous plants. Stream

bank slopes after project completion should be restored to stable-slope steepness (not

steeper than 2:1).

c. The cleared width through any forested area should be the minimum needed to install

the line and no more than 20 feet wide through the forested area to allow the canopy to

close over the line.

d. Use graded stone or riprap to protect the section of trench below the normal water level

from scour or erosion (any stone or riprap fill in the streambed must not be placed

above the existing streambed elevation to avoid creating a fish passage obstruction).

2) Bank Stabilization: Minimize the use of riprap and use alternative erosion protection

materials whenever possible. Riprap should not be placed in the active thalweg channel or

placed in the streambed in a manner that precludes fish or aquatic organism passage (riprap

must not be placed above the existing streambed elevation). Riprap can be used only at the toe

of the sideslopes up to the ordinary high water mark (OHWM). The banks above the OHWM

must be restored, stabilized, and revegetated using geotextiles and a mixture of grasses,

sedges, wildflowers, shrubs, and trees native to the area and specifically for stream

bank/floodway stabilization purposes as soon as possible upon completion.

While hard armoring alone (e.g. riprap or glacial stone) may be needed in certain instances,

soft armoring and bioengineering techniques should be considered first. In many instances,

one or more methods are necessary to increase the likelihood of vegetation establishment.

Combining vegetation with most bank stabilization methods can provide additional bank

protection and help reduce impacts upon fish and wildlife. If hard armoring is needed, wildlife

passage can be facilitated by using a smooth-surfaced armoring material instead of riprap,

such as articulated concrete block mats, fabric-formed concrete mats, or other similar smooth-

surfaced material.



Information about bioengineering techniques can be found at

http://fwww.in.gov/legislative/iac/20120404-IR-312120154NRA.xml.pdf. Also, the following

is a USDA/NRCS document that outlines many different bioengineering techniques for

streambank stabilization: http://directives.sc.egov.usda.gov/17553.wba.

2) Riparian Habitat: We recommend a mitigation plan be developed (and submitted with the

permit application, if required) for any unavoidable habitat impacts that will occur. The

DNR's Floodway Habitat Mitigation guidelines (and plant lists) can be found online at:

http://www.in.gov/legislative/iac/20140806-IR-312140295NRA.xml.pdf.

Impacts to non-wetland forest over one (1) acre should be mitigated at a minimum 2:1 ratio.

If less than one acre of non-wetland forest is removed in a rural setting, replacement should be

at a 1:1 ratio based on area. Impacts to non-wetland forest under one (1) acre in an urban

setting should be mitigated by planting five trees, at least 2 inches in diameter-at-breast height

(DBH), for each tree which is removed that is 10" dbh or greater (5:1 mitigation based on the

number of large trees).

A native riparian forest mitigation plan should use at least 5 canopy trees and 5 understory

trees or shrubs selected from the Woody Riparian Vegetation list or an approved equal. A

native riparian forest mitigation plan for impacts of less than one acre in an urban area may

involve fewer numbers of species, depending on the level of impact. Additionally, a native

herbaceous seed mixture should be planted consisting of at least 10 species of grasses, sedges,

and wildflowers selected from the Herbaceous Riparian Vegetation list or an approved equal.

4) Wetland Habitat: Due to the presence or potential presence of wetland habitat on site, we

recommend contacting and coordinating with the Indiana Department of Environmental

Management (IDEM) 401 program and also the US Army Corps of Engineers (USACE) 404

program. Impacts to wetland habitat should be mitigated at the appropriate ratio (see

guidelines above).

5) Cofferdams: Any proposed dewatering should be detailed using the following guidelines:

a. Dewatering should be limited to one streambank or side of the creek (at the bridge

construction site) at a time so at least half the creek is always flowing naturally. On

larger streams, both sides can be dammed at once as long as the center of the channel

is allowed to flow naturally.

b. Do not dewater directly into the stream. Dewater into a sediment bag, into a roll off

box, and onto a riprap apron or similar system.

c. Cofferdam materials and methods can vary. Self-contained and encapsulated materials

and methods are recommended. Anything filled with water is better than soil-filled

where there is a potential for leaking or failure of the system due to the length of use or

accidents.

d. Dewatering pumps should incorporate filters or bypasses to avoid injuring or killing

fish and other aquatic organisms.

The additional measures listed below should be implemented to avoid, minimize, or

compensate for impacts to fish, wildlife, and botanical resources:

1. Revegetate all bare and disturbed areas with a mixture of grasses (excluding all varieties

of tall fescue), sedges, wildflowers, shrubs, and hardwood trees native to northern Indiana

and specifically for stream bank/floodway stabilization purposes as soon as possible upon

completion.

http://fwww.in.gov/legislative/iac/20120404-IR-312120154NRA.xml.pdf

http://directives.sc.egov.usda.gov/17553.wba

http://www.in.gov/legislative/iac/20140806-IR-312140295NRA.xml.pdf



2. Minimize and contain within the project limits inchannel disturbance and the clearing of

trees and brush.

3. Do not work in the waterway from April 1 through June 30 without the prior written

approval of the Division of Fish and Wildlife.

4. Do not cut any trees suitable for Indiana bat or Northern Long-eared bat roosting

(greater than 3 inches dbh, living or dead, with loose hanging bark, or with cracks, crevices,

or cavities) from April 1 through September 30.

5. Do not use broken concrete as riprap.

6. Underlay the riprap with a bedding layer of well graded aggregate or a geotextile to

prevent piping of soil underneath the riprap.

7. All excavated material must be properly spread or completely removed from the project

site such that erosion and off-site sedimentation of the material is prevented.

8. Minimize the movement of resuspended bottom sediment from the immediate project area.

9. Do not deposit or allow demolition/construction materials or debris to fall or otherwise

enter the waterway.

10. Appropriately designed measures for controlling erosion and sediment must be

implemented to prevent sediment from entering the stream or leaving the construction site;

maintain these measures until construction is complete and all disturbed areas are

stabilized.

11. Seed and protect all disturbed streambanks and slopes not protected by other methods

that are 3:1 or steeper with erosion control blankets that are heavy-duty, biodegradable, and

net free or that use loose-woven / Leno-woven netting to minimize the entrapment and

snaring of small-bodied wildlife such as snakes and turtles (follow manufacturer's

recommendations for selection and installation); seed and apply mulch on all other

disturbed areas.

12. Do not excavate or place fill in any riparian wetland.

In correspondence dated August 9, 2018, the Natural Resources Conservation Service stated:

The proposed project to provide relief to sewer surcharging by installing a CSO 32 and 3rd Street

Pump Station Consolidation Sewer in the City of Fort Wayne, Allen County, Indiana, as referred

to in your letter received July 31, 2018, will not cause a conversion of prime farmland.

VIII. MITIGATION MEASURES

City of Fort Wayne’s PER states:

The project will be designed and implemented to minimize soil erosion and mitigation measures cited

in comment letters from governing agencies will be implemented. Erosion control measures including

seeding, sodding, inlet protection, silt fence, stone construction entrance and dust control may be

implemented in accordance with current soil erosion control practices at the time of construction to

reduce/eliminate erosion of the soils.

To mitigate construction noises and the subsequent resident complaints, construction will only be

allowed from 7:00 am to 5:00 pm Monday through Friday. Appropriate erosion control measures will

be implemented during construction to abate dust and airborne dirt particles. The contractor will be



required to maintain all equipment in good working order to mitigate noise and air pollution caused

by faulty operating equipment.

The City is working with the Parks Department in this area as compensatory mitigation for the St.

Mary’s Riverfront Redevelopment Project. Silt fences will be installed along the river’s edge along

with stream bank and riparian habitat enhancement. The Parks Department received a Section 401

Water Quality Certification for work in this area which was provided to USFWS along with the off-

site stream mitigation for this project as shown in Figure 4.

A Section 401 Water Quality Certification dated September 20, 2017 states that the St. Mary’s

Riverfront Redevelopment Project will: discharge fill material into 0.2615 acre of Wetland A

permanently for the construction of an elevated boardwalk and trails and a portion of a new seawall

on the north bank of the St. Mary’s River. An additional 0.1650 acre of Wetland A will be temporarily

impacted during the construction of the project. Along the north bank, 537 linear feet of glacial stone

and concrete seawall will be constructed. Additionally, a temporary cofferdam will be installed,

impacting 250 linear feet of the north bank to be removed and restored upon completion of

construction. Along the south bank, a concrete and glacial stone seawall will be constructed,

impacting 459 linear feet of the river. All impacts are associated with the St. Mary’s Riverfront

Redevelopment Project. As compensatory mitigation you propose stream bank and riparian habitat

enhancement along 740 linear feet of the St. Mary’s River and 1.54 acres of riparian habitat. Wetland

mitigation will be constructed off-site within the same 8-digit watershed consisting of 0.9835 acre of

forested wetland in Section 3, Township 30 North, Range 12 East in Fort Wayne, Indiana, Allen

County. The off-site mitigation is located north of the intersection of Covington Street and Filmore

Street in Fort Wayne, Indiana.

IX. PUBLIC PARTICIPATION

A properly noticed public hearing was held on September 11, 2018 immediately following the noon

Board of Public Works and Stormwater meetings in the Citizens Square Council Chambers Room 035,

at the City of Fort Wayne, 200 East Berry Street, Suite 270, Fort Wayne, IN 46802. No written

comments were received during the 5-day comment period following the hearing.



Figure 1



Figure 2



Figure 3



Figure 4

Documents

State Revolving Fund Loan Programs Drinking Water, … ch8 EA 11.5.2018.pdf · [email protected] State Revolving Fund Loan Programs Drinking Water, Wastewater, Nonpoint Source