146th_and_Hazel_Dell_Contract_Doc_Appendix_A_Permit.pdf

TH

STREET AND HAZEL DELL PARKWAY

APPENDIX A

PERMITS

Permit Info Permit- 1

PERMIT STATUS

IDEM 401 NWP - Approved. Permit # NWP001907

CSGP- Approved. Permit # INRA18564

US ARMY Corps of Engineers NWP 14- Permit application in process – Anticipate by

09/30/2026

Permit Info Permit- 2

INDIANA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT

100 N. Senate Avenue • Indianapolis, IN 46204

(800) 451-6027 • (317) 232-8603 • Fax (317) 233-6647 • www.idem.IN.gov

Mike Braun Clint Woods Governor Commissioner

Visit on.IN.gov/survey or scan the QR code to provide feedback.

We appreciate your input!

Letterhead INDY Temp-01.2025

July 23, 2026

Matt Lee Hamilton County Highway Department 1700 South 10th Street Noblesville, IN, 46060

Dear Matt Lee:

Re: NWP – In Scope Project: 146th Street and Hazel Dell Parkway Intersection Improvement Permit No.: NWP001907 County: Hamilton

The Office of Water Quality has reviewed your Application for Authorization to Discharge Dredged or Fill Material to State Regulated Wetlands or Waters of the U.S.

dated and received July 17, 2026. The project is located 150 linear feet southwest of Riverview Health Urgent Care. The coordinates are latitude: 40.000206, longitude: -

86.070533 and your application states:

The project is located at the intersection 146th Street and Hazel Dell Parkway in the Cities of Carmel and Noblesville, in Hamilton County. The existing roadway on 146th Street consists of a four-lane divided roadway with a raised median. Average lane widths are 12 feet wide with a 12-foot-wide grassy median, bordered by a 6-inch concrete curb. The purpose of this project is to improve travel efficiency of this intersection to a minimum LOS C through the year 2046.

In order to complete drainage improvement necessary for the project.

approximately 380 sq ft, 43 linear feet, and 15 cys of stream impact will be necessary to replace two 12" RCP pipes with INDOT Type 2 pipe.

Approximately 2 linear feet of existing pipe is within the OHWM of UNT 1 to Kirkendall Creek. The stream impact proposed will entail the replacement of these pipes and associated scour protection at their outfall. The proposed riprap will be underlain with a geotextile. No dewatering

Permit Info Permit- 3

IDEM No. NWP001907 cofferdams, temporary pumparounds, or other temporary impacts are anticipated for this work as this proposed work is the origin point of the UNT, and no natural flow is anticipated during replacement. Should temporary dewatering be required, the contractor will amend this permit and any other necessary waterway permits, either state or federally required. Any disturbed soils within the OHWM will be seeded with INDOT Seed Mix U as specified in the Indiana Design Manual.

Authorized Impact

STREAM IMPACT Length of Impact (linear feet)

Stream Name: Permanent Impact:

Type of Impact: Ephemeral Intermittent Perennial

UNT to Kirkendall Creek

Yes Pipe replacement and scour protection

It is the judgment of this office that the project will qualify for a Section 401 General Water Quality Certification. For more information on General 401 Water Quality Certifications visit https://www.in.gov/idem/waterways/information-about/section-401-water-quality-certification/section-401-us-army-corps-of-engineers-permits-overview/

If you have any questions about this letter, contact me by e-mail at RyBarton@idem.IN.gov.

cc: USACE-Louisville District

Permit Info Permit- 4 https://www.in.gov/idem/waterways/information-about/section-401-water-quality-certification/section-401-us-army-corps-of-engineers-permits-overview/ https://www.in.gov/idem/waterways/information-about/section-401-water-quality-certification/section-401-us-army-corps-of-engineers-permits-overview/

Notification: The permittee must submit a pre-construction notification to the district engineer prior to commencing the activity if the bank stabilization activity: (1) involves discharges of dredged or fill material into special aquatic sites; or (2) is in excess of 500 feet in length; or (3) will involve the discharge of dredged or fill material of greater than an average of one cubic yard per running foot as measured along the length of the treated bank, below the plane of the ordinary high water mark or the high tide line. (See general condition 32.)

(Authorities: Sections 10 and 404)

Note 1: In coastal waters and the Great Lakes, living shorelines may be an appropriate option for bank stabilization, and may be authorized by NWP 54.

Note 2: Under 33 CFR 320.4(g)(2), a landowner has the general right to protect his or her property from erosion, and the district engineer can provide general guidance to the landowner regarding possible alternative methods of protecting his or her property. Permittees are encouraged to use soft bank stabilization approaches (e.g., bioengineering, vegetative stabilization) at sites where those methods are likely to be effective in managing erosion, such as sites where shorelines and banks are subject to moderate to low erosive forces. However, hard bank stabilization activities (e.g., seawalls, bulkheads, revetments, riprap) may be necessary at sites where shorelines and banks are subject to strong erosive forces. An appropriate and effective approach to managing shoreline or bank erosion at a specific site requires consideration of a variety of factors, including but not limited to: bank height; bank condition; the energy of tides, waves, currents, or other water flows that the bank is exposed to; fetch; nearshore water depths; the potential for storm surges; sediment or substrate type;

tidal range in waters subject to the ebb and flow of tides; shoreline configuration and orientation; the width of the waterway; and whether there is infrastructure in the vicinity of the proposed bank stabilization activity that needs to be protected and the degree of protection needed.

14. Linear Transportation Projects. Activities required for crossings of waters of the United States associated with the construction, expansion, modification, or improvement of linear transportation projects (e.g., roads, highways, railways, trails, driveways, airport runways, and taxiways) in waters of the United States. For linear transportation projects in non-tidal waters, the discharge of dredged or fill material cannot cause the loss of greater than 1/2-acre of waters of the United States. For linear transportation projects in tidal waters, the discharge of dredged or fill material cannot cause the loss of greater than 1/3-acre of waters of the United States. Any stream channel modification, including bank stabilization, is limited to the minimum necessary to construct or protect the linear transportation project; such modifications must be in the immediate vicinity of the project.

This NWP also authorizes temporary structures, fills, and work, including the use of temporary mats, necessary to construct the linear transportation project. Appropriate measures must be taken to maintain normal downstream flows and minimize flooding to the maximum extent practicable, when temporary structures, work, and discharges of dredged or fill material, including cofferdams, are necessary for construction activities, access fills, or dewatering of construction sites. Temporary fills must consist of materials, and be placed in a manner, that

Permit Info Permit- 5

Rectangle

ALangille Text Box USACE NWP14 Info will not be eroded by expected high flows. Temporary fills must be removed in their entirety and the affected areas returned to pre-construction elevations. The areas affected by temporary fills must be revegetated, as appropriate.

This NWP cannot be used to authorize non-linear features commonly associated with transportation projects, such as vehicle maintenance or storage buildings, parking lots, train stations, or aircraft hangars.

Notification: The permittee must submit a pre-construction notification to the district engineer prior to commencing the activity if: (1) the loss of waters of the United States exceeds 1/10-acre; or (2) there is a discharge of dredged or fill material in a special aquatic site, including wetlands. (See general condition 32.) (Authorities: Sections 10 and 404)

Note 1: For linear transportation projects crossing a single waterbody more than one time at separate and distant locations, or multiple waterbodies at separate and distant locations, each crossing is considered a single and complete project for purposes of NWP authorization. Linear transportation projects must comply with 33 CFR 330.6(d).

Note 2: Some discharges of dredged or fill material for the construction of farm roads or forest roads, or temporary roads for moving mining equipment, may qualify for an exemption under Section 404(f) of the Clean Water Act (see 33 CFR 323.4).

Note 3: For NWP 14 activities that require pre-construction notification, the PCN must include any other NWP(s), regional general permit(s), or individual permit(s) used or intended to be used to authorize any part of the proposed project or any related activity, including other separate and distant crossings that require Department of the Army authorization but do not require pre-construction notification (see paragraph (b)(4) of general condition 32). The district engineer will evaluate the PCN in accordance with Section D, “District Engineer’s Decision.”

The district engineer may require mitigation to ensure that the authorized activity results in no more than minimal individual and cumulative adverse environmental effects (see general condition 23).

15. U.S. Coast Guard Approved Bridges. Discharges of dredged or fill material incidental to the construction of a bridge across navigable waters of the United States, including cofferdams, abutments, foundation seals, piers, and temporary construction and access fills, provided the construction of the bridge structure has been authorized by the U.S. Coast Guard under the General Bridge Act of 1946, Section 9 of the Rivers and Harbors Act of 1899, or other applicable laws. Causeways and approach fills are not included in this NWP and will require a separate Clean Water Act Section 404 permit. (Authority: Section 404 of the Clean Water Act (Section 404))

16. Return Water From Upland Contained Disposal Areas. Return water from an upland contained dredged material disposal area. The return water from a contained disposal area is administratively defined as a discharge of dredged material by 33 CFR 323.2(d), even though the disposal itself occurs in an area that has no waters of the United States and does not require a section 404 permit. This NWP satisfies the technical requirement for a section 404

Permit Info Permit- 6

INDIANA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT

100 N. Senate Avenue • Indianapolis, IN 46204

Construction Stormwater Permit Summary Report – Sufficiency Letter July 23, 2026

Permit #: INRA18564 146th Street and Hazel Dell Pkwy Roundabout Hamilton County

SITE DETAILS:

Project Name: 146th Street and Hazel Dell Pkwy Physical Address: 146th Street and Hazel Dell Pkwy Westfield, IN 46033

Permit Status: In Effect Permit Issued: 7/21/2026 Permit Expiration: 7/20/2031 Latitude: 40.00040042254227 Longitude: -86.07067966222165

MS4: Hamilton County

Location Description: Intersection of Hazel Dell Parkway and 146th street noblesville IN 46060

CONTACTS:

Project Site Owner (Permittee): Joel Thurman Phone: 317-773-7770

Address: 1700 s 10th street noblesville, IN, 46060 Email: county.highway@hamiltoncounty.in.gov

PROJECT DETAILS

Project Type: Transportation Project County(s): Hamilton Site Ownership Type: County Government Total Project Acreage: 23

Proposed Land Disturbance (acres): 22

Estimated Impervious Area (sq ft): 800000

Est Start Date: 9/1/2026 Est End Date: 12/31/2027

Discharge Type: Surface Water Storm System:

Receiving Stream: Kirkendall Creek (3881) Waterbody 2:

This notice is acceptable to be posted at the project site to verify NPDES permit coverage. If the project is regulated by a Municipal Separate Storm Sewer System (MS4), you are required to post additional information as required by the MS4 that has jurisdiction (i.e. MS4 Permit, etc). NPDES permit coverage does not supersede local requirements that may be required to conduct activities associated with this project.

If the project is regulated by an MS4, direct inquiries to the local MS4.

If this project is outside an MS4 or owned/operated by an MS4, inquiries may be directed to the IDEM Stormwater Program at Stormwat@idem.IN.gov.

Permit Info Permit- 7

The Notice of Intent (NOI) submitted online is your certification that the project meets the requirements of the construction stormwater general permit (INRA00000). The NOI is submitted to obtain NPDES permit coverage for the proposed activities at the project site and does not constitute approval to conduct activities that are related to other local, state, or federal permits.

If information is not accurate it is the responsibility of the permittee to update the information. If it is determined that information is inaccurate or deficient you may be requested to address those items.

If the project is within a Municipal Separate Storm Sewer System (MS4) and regulated by the MS4, the Construction/Stormwater Pollution Prevention Plan (SWP3) review was completed by the MS4 or their representative and verification by the MS4 was part of the application submission. All MS4 stormwater approvals must be obtained prior to beginning land disturbance at the project site.

Once construction begins, the MS4 has primary responsibility for compliance and enforcement of stormwater regulations within their local jurisdiction.

A National Pollutant Discharge Elimination System (NPDES) authorization number is assigned to each project for which an NOI has been submitted to obtain permit coverage. This number is used as a reference for the project and must be included with any future correspondence submitted to IDEM.

It is important that all activities associated with your project are in compliance with the requirements of the Construction Stormwater General Permit (CSGP) and where applicable all local MS4 ordinances/stormwater permits. In accordance with the CSGP, you are required, at a minimum to implement your SWP3, implement and maintain all stormwater management measures, monitor the effectiveness of the measures and take corrective actions until the project is complete and terminated. To maintain compliance, it may be necessary to modify the SWP3 as work progresses.

Upon completion of the project, you are required to terminate permit coverage. Criteria for termination eligibility can be found in Section 6.0 of the CSGP. If this project is permitted through an MS4, there may be local requirements/approvals that must be met prior to filing a notice of termination with IDEM. If an MS4 has adopted a requirement for termination, you are responsible to comply with all local provisions prior to submitting the Notice of Termination to IDEM. Failure to meet local MS4 requirements may constitute a violation of the local MS4 ordinance.

Construction Stormwater General Permit: Accessed at http://www.idem.IN.gov/2331.htm IDEM Regulatory ePortal: Permittees are required to utilize this service to manage their IDEM Construction Stormwater General Permit activities (Renewals, Amendments, and Terminations. The service may be accessed at https://stormwater.idem.iN.gov .

Questions regarding this notification may be directed to the program email account at Stormwat@idem.IN.gov.

Notice of Right to Administrative Review

If you wish to challenge this authorization you must file a Petition for Administrative Review with the Office of Environmental Adjudication (OEA) within fifteen (15) days of the issuance of this notice (eighteen (18) days if you received this notice by U.S. Mail), and a copy must be served upon IDEM and all persons to whom the authorization is directed. The requirements for filing a Petition for Administrative Review are found in IC 4-21.5-3-7, IC 13-15-6-1, IC 13-15-6-2 and 315 IAC 1-3-2. Addresses for OEA and IDEM are:

Director Commissioner Office of Environmental Adjudication Indiana Department of Environmental Management Indiana Government Center North Indiana Government Center North Room N103 Room 1301 100 North Senate Avenue 100 North Senate Avenue Indianapolis, Indiana 46204 Indianapolis, Indiana 46204

If you are entitled to notice under IC 4-21.5-3-5(b) and would like to obtain notices of any pre-hearing conferences, preliminary hearings, hearings, stays, or orders disposing of the review of this action without intervening in the proceeding you must submit a written request to OEA at the address above.

More information on the review process is available at the OEA website at http://www.in.gov/oea and the IDEM website at https://www.in.gov/idem/legal/2329.htm.

Permit Info Permit- 8

Construction Stormwater General Permit (INRA00000) [Name] County SWCD Revised February 2, 2022 Page 1 of 5

Hamilton County Soil and Water Conservation District 1717 Pleasant Street, Suite 100 Noblesville, IN 46060

Construction/ Stormwater Pollution Prevention Plan Technical Review

Construction Stormwater General Permit:

https://www.in.gov/idem/stormwater/construction-land-disturbance-permitting/ (INRA00000 effective 12/18/2021)

Construction/Stormwater Pollution Prevention Plan Technical Review and Comment

Project Name: 146 St and Hazel Dell Roundabout

Scope of Project:

County(ies): Hamilton

Latitude: 40°0'0"N Longitude: 86°4'12"W

Plan Submittal Date:

July 10, 2026

Plan Review Date:

July 20, 2026

Plan Preparer: Samantha Groce Affiliation: Butler Fairman & Seufert

Address: 500 E 96 Street, Suite 500

City: Indianapolis State: IN Zip: 46240

Phone: 317-363-8600 Cell Phone: Email: sgroce@bfsengr.com

Project Site Owner: Hamilton County Commissioners Company Name (if applicable):

Address: 1 Hamilton County Square, STE 157

City: Noblesville State: IN Zip: 46069

Phone: 317-776-8493 Cell Phone: Email:

Plan Reviewer: Mark McCauley, CPESC Affiliation: Hamilton County Soil & Water Conservation District On behalf of: IDEM

Address: 1717 Pleasant Street, Suite 100

City: Noblesville State: IN Zip: 46060

Phone: 317-773-2181 Cell Phone: Email: mark.mccauley@hamiltoncounty.in.gov

Plan Review Status:

☐ Plan is Adequate A comprehensive plan review has been completed and it has been determined that the plan satisfies the minimum requirements of the Construction Stormwater General Permit INRA00000 (Effective 12-16-2021).

☐ Preliminary Review A comprehensive review will not be completed at this time. The plan review authority reserves the right to perform a comprehensive review at a later date, and revisions may be required at that time.

Conditional Acceptance

Acceptance of the plan is conditional. The conditional acceptance is contingent upon addressing the issues identified in the comment sections.

☐ Plan is Deficient Significant deficiencies were identified and must be addressed. Refer to the comment sections.

Action:

Submit a Notice of Intent:

• Submit the Notice of Intent (NOI) online through the IDEM Regulatory ePortal (https://stormwater.idem.in.gov/ncore/external/home)

Do not file a Notice of Intent or commence land-disturbing activities: Deficiencies must be adequately addressed and an acceptable plan review completed.

☒ Comments: Refer to Plan Review Comments Sections of this document.

Revisions: Update and submit the revised Construction/Stormwater Pollution Prevention Plan as indicated below.

Revisions must be submitted through the Regulatory ePortal at (https://stormwater.idem.in.gov/ncore/external/home)

☐ Update and submit a complete plan set that addresses plan deficiencies.

☐ Update and submit a document (narrative and/or plan sheets) that address plan deficiencies.

☐ Update and submit a complete plan set that addresses plan deficiencies. A comprehensive plan review will not be completed.

Permit Info Permit- 9 https://www.in.gov/idem/stormwater/construction-land-disturbance-permitting/ mailto:mark.mccauley@hamiltoncounty.in.gov https://stormwater.idem.in.gov/ncore/external/home https://stormwater.idem.in.gov/ncore/external/home

Construction Stormwater General Permit (INRA00000) [Name] County SWCD Revised February 2, 2022 Page 2 of 5

Plan Review Information

• The technical review and comment is intended to evaluate the completeness of the Construction/Stormwater Pollution Prevention Plan for the project. The Plan submitted was not reviewed for the adequacy of engineering design. All measures included in the plan, as well as those recommended in the comments should be evaluated as to their feasibility by a qualified individual with structural measures designed by a qualified engineer. The Plan has not been reviewed for other local, state, or federal permits that may be required to proceed with this project.

• Additional information, including design calculations may be requested to further evaluate the plan.

• All proposed stormwater pollution prevention measures and those referenced in this review must meet the design criteria and standards set forth in the "Indiana Stormwater Quality Manual" from the Indiana Department of Environmental Management or similar Guidance Documents.

• Construction activities and unforeseen weather conditions may affect the performance of the erosion and sediment control system, individual measures, or the effectiveness of the plan. The plan must be a flexible document, with provisions to modify or substitute measures as necessary to ensure compliance.

Section A: Construction Plan Elements

A d eq u at e

D ef ic ie n t

N A

The construction plan elements include general information associated with the project site that are critical for the evaluation of the stormwater pollution prevention plan component. This information includes, but is not limited to an index, resource information, reference maps, grading information, project layout and design, and drainage plan

☒ ☐ ☐ 1 Index of the location of required plan elements in the construction plan

☒ ☐ ☐ 2 A vicinity map depicting the project site location in relationship to recognizable local landmarks, towns, and major roads

☒ ☐ ☐ 3 Narrative of the nature and purpose of the project

☒ ☐ ☐ 4 Latitude and longitude to the nearest fifteen (15) seconds

☒ ☐ ☐ 5 Legal description of the project site

☒ ☐ ☐ 6 11 X 17-inch plat showing building lot numbers/boundaries and road layout/names

☒ ☐ ☐ 7 Boundaries of the one hundred (100) year floodplains, floodway fringes, and floodways

☒ ☐ ☐ 8 Land use of all adjacent properties

☒ ☐ ☐ 9 Identification of a U.S. EPA approved or established TMDL

☒ ☐ ☐ 10 Name(s) of the receiving water(s)

☒ ☐ ☐ 11 Identification of discharges to a water on the current 303d list of impaired waters and the pollutant(s) for which it is impaired

☒ ☐ ☐ 12 Soil map of the predominant soil types

☒ ☐ ☐ 13 Identification and location of all known wetlands, lakes and water courses on or adjacent to the project site (construction plan, existing site layout,)

☒ ☐ ☐ 14 Identification of any other state or federal water quality permits or authorizations that are required for construction activities

☒ ☐ ☐ 15 Identification and delineation of existing cover, including natural buffers

☒ ☐ ☐ 16 Existing topography at a contour interval appropriate to indicate drainage patterns

☒ ☐ ☐ 17 Location(s) of where run-off enters the project site

☒ ☐ ☐ 18 Location(s) of where run-off discharges from the project site prior to land disturbance

☒ ☐ ☐ 19 Location of all existing structures on the project site

☒ ☐ ☐ 20 Existing permanent retention or detention facilities, including manmade wetlands, designed for the purpose of stormwater management

☒ ☐ ☐ 21 Locations where stormwater may be directly discharged into ground water, such as abandoned wells, sinkholes, or karst features

☒ ☐ ☐ 22 Size of the project area expressed in acres

Permit Info Permit- 10

Construction Stormwater General Permit (INRA00000) [Name] County SWCD Revised February 2, 2022 Page 3 of 5

A d eq u at e

D ef ic ie n t

The construction plan elements include general information associated with the project site that are critical for the evaluation of the stormwater pollution prevention plan component. This information includes, but is not limited to an index, resource information, reference maps, grading information, project layout and design, and drainage plan

☒ ☐ ☐ 23 Total expected land disturbance expressed in acres

☒ ☐ ☐ 24 Proposed final topography

☒ ☐ ☐ 25 Locations and approximate boundaries of all disturbed areas

☒ ☐ ☐ 26 Location, size, and dimensions of all stormwater drainage systems, such as culverts, storm sewers, and conveyance channels

☒ ☐ ☐ 27 Locations of specific points where stormwater and non-stormwater discharges will leave the project site

☒ ☐ ☐ 28 Location of all proposed site improvements, including roads, utilities, lot delineation and identification, proposed structures, and common areas

☒ ☐ ☐ 29 Location of all on-site soil stockpiles and borrow areas

☒ ☐ ☐ 30 Construction support activities that are expected to be part of the project

☐ ☐ ☒ 31 Location of any in-stream activities that are planned for the project including, but not limited to stream crossings and pump arounds

Section A – Comments:

• Evaluate areas with potential waters of the state and, where required, verify if permits/authorizations are required prior to any impacts to waters of the state. These potential resources include areas with hydric soil, hydrophytic vegetation, pooling water, or evidence of flowing water such as swales, ditches, drains, or natural conveyances. Evaluation of hydric soil, hydrophytic vegetation, or pooling water should conform to the US Army Corps of Engineers Wetlands Delineation Manual," Technical Report Y- 87-1, and the applicable regional supplement https://www.usace.army.mil/Missions/Civil-Works/Regulatory-Program-and- Permits/reg_supp/. Avoidance and minimization of impacts to waters of the state should be prioritized.

• A-12 The soil types mentioned under this item are not soil types common to this area, and do not match the soil types shown on the map on Sheet 178. The soils types listed on the SWPPP must be from a different project and location.

Permit Info Permit- 11 https://www.usace.army.mil/Missions/Civil-Works/Regulatory-Program-and-Permits/reg_supp/ https://www.usace.army.mil/Missions/Civil-Works/Regulatory-Program-and-Permits/reg_supp/

Construction Stormwater General Permit (INRA00000) [Name] County SWCD Revised February 2, 2022 Page 4 of 5

Section B: Stormwater Pollution Prevention Plan – Erosion and Sediment Control/Project Site Management A d eq u at e

D ef ic ie n t

B

The construction component of the Stormwater Pollution Prevention Plan includes stormwater quality measures to address erosion, sedimentation, and other pollutants associated with land disturbance and construction activities.

Proper implementation of the plan, maintenance of measures, and administering a self-monitoring program is required to manage the project site to minimize the discharge of sediment and other pollutants. Construction activities and unforeseen weather conditions may affect the performance of the erosion and sediment control system, individual measures, or the effectiveness of the plan. The plan must be a flexible document, with provisions to modify or substitute measures as necessary to ensure compliance.

☒ ☐ ☐ 1 Description of the potential pollutant generating sources and pollutants, including all potential non-stormwater discharges

Where applicable, Items in 2 through 10 below will be evaluated for Location, dimensions, detailed specifications, and construction details

☒ ☐ ☐ 2 Stable construction entrance locations and specifications

☒ ☐ ☐ 3 Specifications for temporary and permanent stabilization

☒ ☐ ☐ 4 Sediment control measures for concentrated flow areas

☒ ☐ ☐ 5 Sediment control measures for sheet flow areas

☒ ☐ ☐ 6 Run-off control measures

☒ ☐ ☐ 7 Stormwater outlet protection locations and specifications

☐ ☐ ☒ 8 Grade stabilization structure locations and specifications

☒ ☐ ☐ 9 Dewatering applications and management methods

☐ ☐ ☒ 10 Measures utilized for work within waterbodies

☒ ☐ ☐ 11 Maintenance guidelines for each proposed temporary stormwater quality measure

☒ ☐ ☐ 12 Planned construction sequence describing the relationship between implementation of stormwater quality measures in relation to land disturbance

☐ ☐ ☒ 13 Provisions for erosion and sediment control on individual building lots regulated under the proposed project

☒ ☐ ☐ 14 Material handling and spill prevention and spill response plan meeting the requirements in 327 IAC 2-6.1

☒ ☐ ☐ 15 Material handling and storage procedures associated with construction activity

Section B – Comments:

• Stormwater quality measures for the reduction of sediment have not been evaluated for adequacy of design. The proposed measures included in this SWP3 are being accepted based on the design engineer’s submittal.

Permit Info Permit- 12

Construction Stormwater General Permit (INRA00000) [Name] County SWCD Revised February 2, 2022 Page 5 of 5

Section C: Stormwater Pollution Prevention Plan – Post-Construction A d eq u at e

D ef ic ie n t

C

The post-construction component of the Stormwater Pollution Prevention Plan includes the implementation of stormwater quality measures to address pollutants that will be associated with the final project land use. Post-construction stormwater measures should be functional upon completion of the project. Long term functionality of the measures is critical to their performance and should be monitored and maintained.

☒ ☐ ☐ 1 Description of pollutants and their sources associated with the proposed land use

☒ ☐ ☐ 2 Description of proposed post-construction stormwater measures

☒ ☐ ☐ 3 Plan details for each stormwater measure

☒ ☐ ☐ 4 Sequence describing stormwater measure implementation

☒ ☐ ☐ 5 Maintenance guidelines for proposed post-construction stormwater measures

☒ ☐ ☐ 6 Entity that will be responsible for operation and maintenance of the post-construction stormwater measures

Section C – Comments:

• Post-construction stormwater quality and quantity measures have not been evaluated for adequacy of design. The proposed measures included in this SWP3 are being accepted based on the design engineer’s submittal.

The rate of stormwater run-off and/or volume from the project site must meet local requirements to address stormwater quantity as established by ordinance or other regulatory mechanism. When a local requirement does not exist, the post-development run-off discharge from the project site must not exceed the pre-development discharge based on the two-year, ten-year, and one-hundred-year peak storm events.

Permit Info Permit- 13

500 East 96th Street, Suite 500 Indianapolis, IN 46240 317.713.4615 bfsengr.com

146thStreet and Hazel Dell Pkwy Roundabout

Noblesville, Hamilton County

Stormwater Pollution Prevention Plan (SWPPP)

Prepared for:

Hamilton County

Prepared by:

Butler Fairman & Seufert, Inc Samantha Groce sgroce@bfsengr.com

July 10, 2026

Permit Info Permit- 14

500 East 96th Street, Suite 500 Indianapolis, IN 46240 317.713.4615 bfsengr.com

Construction Plan Elements (Section A)

A1. Index Showing Locations of Required Plan Elements See sheet X of X for the Erosion Sediment Control Plan. Plan Elements A2-A31, B1-B15, & C1-C6 have also been addressed on this sheet and are as follows:

A2. Vicinity Maps Showing Project Location Maps showing the project vicinity and proposed project location are provided on the Title Sheet of the Construction Plan Document. Additional maps can be found in Appendix A.

A3. Narrative Describing the Nature and Purpose of the Project The project proposes to reconstruct the 146th and Hazel Dell Parkway intersection and provide a grade separated interchange. The primary purpose of this project is to improve safety and traffic flow.

A4. Latitude and longitude The approximate location of the site is Latitude 40°0'0"N, Longitude: 86°4'12"E.

Latitude 40.000, Longitude: 86.0700

A5. Legal Description The project is located along 146th street at the intersection of Hazel Dell Parkway in Noblesville, Indiana. Specifically, the project is located in Sections 15 and 15; Township 18N; Range 4E;

Noblesville Township; Sections 21 and 22; Township 18N; Range 4E; Clay Township In Hamilton County, Indiana

A6. 11 X 17 inch plat showing building lot number/boundaries and road layout/names Refer to plans for boundary, road layout and names.

A7. 100 year floodplains, floodways, and floodway fringes See Appendix A – Reference Maps. The project is just west of Zone AE of the Kirkendall Creek.

A8. Land use of adjacent properties, including upstream watershed The land use within, and adjacent to, the project limits mostly consists of commercial and residential development.

A9. Identification of a TMDL and discharges to 303(d) impaired waters There is a TMDL for Kirkendall Creek Vestal Ditch-White River Watershed within established project area. The Plan is West Fork White River (Muncie to Hamilton-Marion County Line) Watershed established 4.8.2004. Impairments associated with TMDL are E. coli. The nature of this project is not expected to increase the impairments associated with E. coli.

A10. Identify All Receiving Waters Stormwater on site will sheet flow and collect within road side ditches then discharge to Kirkendall Creek to vestal Ditch and then ultimately White River, West Fork.

A11. Identification of discharges to water on a current 303(d) list of impaired waters and the pollutant(s) for which it is impaired Kirkendell Creek Vestal Ditch waterbody (State ID INK0124_05) is list in good. This project is not anticipated to add any impairments to the waterway.

Permit Info Permit- 15

146th Street and Hazel Dell

SWPPP

A12. Soils Map of predominate soil type

See Appendix A – Reference Maps. Majority of the soil within the project area consists of:

AxvA, Auten Loam 0 to 1 percent slopes, QuiA, Quinn Loam, 0 to 1 % slopes, ReyA, Rensselaer Loam, 0 to 1 percent slopes.

A13. Identification and location of all known wetlands, lakes, and watercourses on or adjacent to the project site Within the project site there are no known wetlands or watercourses.

A14. Identification of any other state or federal water quality permits Additional state or federal permits for IDNR, IDEM, and USACE are being simultaneously pursued for this project.

A15. Identification and delineation of existing cover, including natural buffers The surrounding ground cover consists of agricultural and commercial developments. No forested buffers exist within the right of way of this project. Refer to Plan Sheets for Existing Site Conditions.

A16. Existing site topography at an interval appropriate to show detailed drainage patterns See Plan Sheets for site conditions with contour intervals.

A17. Location(s) where run-off enters the project site See The Plan & Profile & Cross Section Sheets and contour intervals to see where water run-off enters the project site. The water will enter the project as sheet flow and existing roadside ditches.

A18. Location(s) where run-off discharges from the project site prior to land disturbance Stormwater discharges through storm sewer system to existing storm sewer structures, ditches and detention ponds within the project limits. See the Plan & Profile & Cross Section Sheets for additional details.

A19. Location of all existing structures on project site See the Plan & Profile Sheets for existing structures on the project site along the intersection.

A20. Existing permanent retention or detention facilities, including manmade wetlands, designed for the purpose of stormwater management

There are three existing detention/retention facilities within the project area.

A21. Locations where stormwater may directly discharge into groundwater, such as abandoned wells, sinkholes, or karst features No anticipated groundwater discharges, as no abandoned wells, sinkholes, or karst features were found at the site.

A22. Size of project area expressed in acres Project size is 23 acres.

A23. Total expected land disturbance expressed in acres Total expected land disturbance is 22 acres.

A24. Proposed final topography at an interval appropriate to show detailed drainage patterns The final topography is shown on the Plan and Profile Sheets as well as the Grading Plan Sheets.

A25. Locations and approximate boundaries of all disturbed areas The boundaries of disturbed areas are depicted on the Construction Detail Sheets and Erosion Control Sheets.

A26. Locations, size, and dimensions of all stormwater drainage system such as culverts, Permit Info Permit- 16 stormwater sewer, and conveyance channels All stormwater drainage systems are depicted on the Plan and Profile Sheets as well as summarized in Structure Data Sheet.

A27. Location of specific points where stormwater and non-stormwater discharges will leave the project site.

All internal site stormwater will be captured and routed to the onsite stormwater system which outlets to near 55+00 on east end of 146th street and 15+00 on Hazel Dell. See the, Plan & Profile, and Cross Section sheets for details.

A28. Location of all proposed site improvements.

See the Grading Plans and Plan & Profile sheets for all proposed improvements. Improvements shall be contained within the construction limits as shown on the Construction Detail Sheets.

A29. Locations of proposed soil stockpiles, borrow and/or disposal areas.

Proposed borrow or disposal sites shall be identified by the contractor before the material is excavated or disposed of within or outside the R/W. The contractor shall ensure all appropriate measures are taken in accordance w/Section 203.08, 203.09, & 212. The contractor shall comply w/Section 108.04 of the Indiana Department of Transportation (INDOT) Standard Specifications.

A30. Construction support activities that are expected to be part of the project.

Construction support activities including, but not limited to, staging areas and material storage areas are expected to be part of this project. The location of such areas are to be determined by the contractor and in accordance with INDOTs Standard Specifications. The concrete washout area shall not be within 50 feet of waterway and must be accessed via stable access area.

A31. Location of any in-stream activities that are planned for the project including, but not limited to, stream crossings and pump arounds.

N/A

(Section B)

B1. Description of potential pollutant generating sources and pollutants, including all potential non-stormwater discharges Sediment – The most abundant potential pollutant generated on the site during construction activities would be soil suspended in stormwater runoff. Suspended soil is likely to be generated from any areas of exposed soil during mass grading and finish grading operations. Suspended sediment through the implementation of operation controls described in the SWPPP. All exposed soils are to be temporarily seeded or mulched so as to not be left unexposed for more than 7 days.

Vehicle Fluids – Potential discharge of automobile and construction equipment fluids from leakage.

all repairs should be done off site and the vehicle maintained regularly to avoid leakage.

Solid Waste – No solid waste materials are allowed to be discharged via stormwater. All solid waste including disposable materials must be collected and placed in containers.

Sanitary Facilities – State and local sanitary regulations are met. Temporary sanitary facilities will be provided with proper installation and maintenance, serviced by commercial operator.

Concrete Washout – Concrete washout shall be present onsite. Concrete washout will meet all required standards. Contractor shall not utilize in ground pits. Washouts will be emptied upon

Permit Info Permit- 17 reaching 50% capacity.

Litter – Construction site shall be kept clean at all times. Miscellaneous litter poses a threat to surrounding waterways.

Dust – Contractor will provide dust control when conditions warrant.

B2. Stable construction entrance locations and specifications The contractor shall utilize existing streets and drives as much as possible for construction ingress and egress. The contractor shall keep public roads and private drives clear and remove all dust, dirt, and debris as a result of construction activities. Temporary construction entrances shall meet the requirements of the construction gravel entrance as shown on the erosion control details.

B3. Specifications for temporary and permanent stabilization Seeding of disturbed areas shall be implemented for all disturbed land left inactive for a period of seven (7) days, including soil stockpiles. Permanent seeding shall be implemented for all disturbed land and shall occur once final grading has been completed. See the Plan & Profile Sheets & Erosion Control Details. See item B-12 for sequencing information, and the erosion control notes for application information for seeding and mulching.

B4. Sediment control measures for concentrated flow areas Concentrated flow is anticipated near storm sewer system outlets. This flow will be managed with riprap scour pads. Additionally, during construction inlet protection will be utilized for the storm sewer inlets.

B5. Sediment control measures for sheet flow areas and perimeter control measures Sediment control in areas of sheet flow shall be handled via silt fence, filter socks, and temporary and permanent seeding. See the Erosion Control Sheets, INDOT standard specifications, and INDOT standard drawing numbers E205-TECD-10 and E 205-TECD-11.

B6. Runoff control measures Addition measures for runoff control are not expected to be needed at this site. However, the contractor will be prepared to employ silt fence, filter sock, and/or flow diversion if necessary.

B7. Storm water outlet protection specifications Stormwater outlet protection will be handled via riprap, rock filter berms, or rock check dams. See the Erosion Control Sheets & Erosion Control Details Sheets.

B8. Grade Stabilization structure locations and specifications Grade stabilization will not be required for the project.

B9. Dewatering applications and management methods Dewatering will be necessary for installation of work below the water table all dewatering will be performed as detailed below.

Description and Purpose - Dewatering operations are practices that manage the discharge of pollutants when non- stormwater and accumulated precipitation must be removed from a work location so that construction work may be accomplished.

Suitable Applications - These practices are implemented for discharges of non-stormwater from construction sites. Non-stormwaters include, but are not limited to, groundwater, water from cofferdams, water diversions, and waters used during construction activities that must be removed from a work area. Practices identified in this section are also appropriate for implementation when managing the removal of accumulated precipitation (stormwater) from depressed areas at a construction site.

Limitations - Site conditions will dictate design and use of dewatering operations. The controls

Permit Info Permit- 18 discussed in this best management practice (BMP) address sediment only. The controls detailed in this BMP only allow for minimal settling time for sediment particles. Use only when site conditions restrict the use of the other control methods. Dewatering operations will require, and must comply with, applicable local permits.

Implementation - Dewatering discharges must not cause erosion at the discharge point. A variety of methods can be used to treat water during dewatering operations. The size of particles present in the sediment and permit or receiving water limitations on sediment are key considerations for selecting sediment treatment option(s); in some cases, the use of multiple devices may be appropriate. Dewatering could take place at excavations for the equipment foundations, any dewatering operations will be directed to an appropriate sediment control measure - typically a geotextile filter bag. Filter bags will be replaced upon reaching 75% of capacity.

B10. Measures utilized for work within waterbodies No work within waterbodies is expected for this project.

B11. Maintenance guidelines for each proposed stormwater quality measure All erosion and sediment control measures are required to be evaluated weekly and within 24 hours prior to or following a qualifying rain event (0.5”) in accordance with the CSGP. Any issues identified should be corrected within 48 hours of identification.

Temporary Construction Entrance Maintenance:

· Inspect Daily.

· Reshape gravel areas as needed for drainage and runoff control.

· Top-dress gravel areas with 2" of clean #2 aggregate as needed.

· Immediately remove mud and sediment tracked or washed onto public roads.

Ensure adequate method of sediment removal from roads is available on-site Temporary Seeding:

· Inspect within 24 hours of each rain event and at least once every seven days

· Monitor for erosion damage and adequate cover; reseed, fertilize, and apply mulch where necessary.

· Check for erosion or movement of mulch and repair immediately.

· If nitrogen deficiency is apparent, top-dress fall seeded wheat or rye seeding with 50 pounds per acre of nitrogen in February or March.

Erosion Control Blanket:

· Inspect within 24 hours of each rain event and at least once every seven days

· Check for erosion under or displacement of the blanket.

· If any area shows erosion, pull back the portion of the blanket covering the eroded area, add soil and tamp, reseed the area, replace and staple the blanket.

Silt Fence:

· Inspect within 24 hours of a rain event and at least once every seven days.

· If fence fabric tears, starts to decompose, or in any way becomes ineffective, replace the affected portion immediately. Note: All repairs should meet specifications as outlined within this measure.

Specifically, the repaired ends should be wrapped with the existing end.

· Remove deposited sediment when it is causing the filter fabric to bulge or when it reaches one-half (1/2) the height of the fence at its lowest point. Be careful not to undermine silt fence when removing sediment. When contributing drainage area has been stabilized, remove the fence and sediment deposits, grade the site to blend with the surrounding area, and stabilize.

Concrete Washout:

Permit Info Permit- 19

· Inspect daily and after each storm event.

· Inspect the integrity of the structure as well as check for leaks, spills, and tracking.

· The structure is required to be adjacent to and accessed from stable surface.

· Concrete washouts should be removed or stopped from being used when they reach 50% of the storage capacity.

· The plastic liner should be replaced if compromised and after every cleaning.

Drop Inlet Protection

· Inspect within 24 hours of a rain event and at least once every seven days.

· If fabric tears starts to decompose, or in any way becomes ineffective, replace immediately.

· Remove deposited sediment when it reaches one-half (1/2) the height of the measure at its lowest point. When contributing drainage area has been stabilized, remove the measure and sediment deposits, grade the site to blend with the surrounding area, and stabilize.

Pipe Protection

· Inspect within 24 hours of a rain event and at least once every seven days.

· If measure starts to become compromised, or in any way becomes ineffective, replace immediately.

· Remove deposited sediment when it reaches one-half (1/2) the height of the measure at its lowest point. When contributing drainage area has been stabilized, remove the measure and sediment deposits, grade the site to blend with the surrounding area, and stabilize.

Filter Sock:

· Inspect within 24 hours of a rain event and at least once every seven calendar days.

· Remove accumulated sediment when it reaches one-quarter (1/4) the height of the filter sock.

· Inspect to ensure that the sock is maintaining its integrity and producing adequate flow.

· Repair eroded and damaged areas.

· If ponding becomes excessive, socks should be removed and either reconstructed or new products installed.

· If the filter sock is not designed as a permanent filter and the contributing drainage area has been stabilized, use a blade or knife to cut open sock and spread to incorporate the organic material into the soil, or spread it over the top of the soil surface for final seeding. Remove and dispose of sock.

Check Dam:

· Inspect within 24 hours of a rain event and at least once every seven calendar days.

· Remove accumulated sediment when it reaches one-half the height of the check dam.

· Inspect to ensure that the check dam is maintaining its integrity, properly constructed, stable, and securely in place.

· Repair eroded and damaged areas.

· If ponding becomes excessive, check dams should be removed and either reconstructed or new product installed.

Check and maintain any additional erosion control measures as needed in accordance with INDOT Standard Specification 205.03, IDEM Stormwater Quality Manual.

B12. Planned construction sequence that describes the implementation of stormwater quality measure in relation to land disturbance All INDOT Standards for erosion control and the IDEM Stormwater Quality Manual shall be applicable. When the two conflict, the more stringent shall apply. Stabilization must be initiated by

Permit Info Permit- 20 the end of the seventh (7) day for areas that are left idle, and permanent stabilization must be achieved within 14 days. Final stabilization standard remains at 70% density for permit termination.

Refer to the "Seasonal Soil Protection Chart", included on next page.

Preconstruction:

A. Notify project owner B. Contact the Indiana Underground Plant Protection Systems, Inc. to verify the location of any and all underground utilities.

C. Evaluate, mark, and protect important trees, rooting zones, unique areas to be preserved and avoided, and vegetation suitable for filter strips, especially in perimeter areas.

D. Install temporary construction entrances at all access points.

E. Exhibit CSGP information at the job site. Contractor shall designate a person responsible for on-site inspections and for providing this Stormwater Pollution Prevention Plan (SWP3)…