22-ENG-03_FT_Permits.pdf

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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: 116 Street & Hoover Road Roundabout

Scope of Project:

County(ies): Hamilton

Latitude: 39º 57’ 21” N Longitude: 86º 11’ 35” W

Plan Submittal Date:

June 30, 2025

Plan Review Date:

July 13, 2025

Plan Preparer: Courtney Hessler Affiliation: American Structurepoint

Address: 9025 River Road, Ste. 200

City: Indianapolis State: IN Zip: 46240

Phone: 317-547-5580 Cell Phone: Email: chessler@structurepoint.com

Project Site Owner: City of Carmel Company Name (if applicable): Jeremy Kashman, City Engineer

Address: One Civic Square

City: Carmel State: IN Zip: 46032

Phone: 317- 571-2400 Cell Phone: Email: jkashman@carmel.in.gov

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.

https://www.in.gov/idem/stormwater/construction-land-disturbance-permitting/ mailto:chessler@structurepoint.com mailto:jkashman@carmel.in.gov 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

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.

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.

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.

CONSTRUCTION STORMWATER

POLLUTION PREVENTION PLAN

For:

116th Street and Hoover Road Roundabout

City of Carmel One Civic Sq.

Carmel, IN

Prepared by:

American Structurepoint, Inc.

9025 River Road, Suite 200 Indianapolis, Indiana 46240

June 2025 i ASI Proj. No: 2022.02347

CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN

INDEX

Item Description SWPPP Page No.

A1 Plan Index

A2 Vicinity Map

A3 Project Narrative

A4 Latitude and longitude

A5 Legal Description of the Project Site

A6 11 X 17-inch Plat

A7 100-Year Floodplains, Floodways, and Floodway Fringes

A8 Adjacent Land Use

A9 Identification of a U.S. EPA Approved or Established TMDL

A10 Identification of All Receiving Waters

A11 Identification of Discharches to a Water on the Current 303(D) List of Impaired Waters and the Pollutant(s) for Impairment

A12 Soils Map, Including Soil description and Limitations

A13 Location and Name of All Wetlands, Lakes, and Watercourses On and Adjacent to the Site

A14 State and Federal Water Quality Permits

A15 Identification and Delineation of Existing Cover

A16 Existing Site Topography

A17 Locations Where Run-off Enters the Project Site

A18 Locations Where Run-off Discharges from the Project Site Prior to Land Disturbance 4

A19 Location of All Existing Structures on the Project Site

A20 Existing Permanent Retention or Detention Facilities, Including Manmade Wetlands .. 4

A21 Locations Where Stormwater May Be Directly Discharged into Ground Water, Such as Abandoned Wells, Sinkholes, or Karst Features

A22 Size of the Project Area

A23 Total Expected Land Disturbance

A24 Proposed Final Site Topography

A25 Locations and Approximate Boundaries of All Disturbed Areas

A26 Locations, Size, and Dimensions of Proposed Stormwater Systems

A27 Specific Point Where Stormwater Discharge Will Leave the Site

A28 Location of All Proposed Site Improvements

A29 Locations of Proposed Soil Stockpiles and/or Borrow/Disposal Areas

A30 Construction Support Activities that are Expected to be Part of the Project

A31 Location of Any In-Stream Activities

B1 Description of Potential Pollutant Sources Associated with Construction Activities

B2 Stable Construction Entrance Locations and Specifications

B3 Permanent and Temporary Surface Stabilization Specifications

B4 Sediment Control Measures for Concentrated Flow Areas

B5 Sediment Control Measures for Sheet Flow Areas

B6 Runoff Control Measures

B7 Stormwater Outlet Protection Locations and Specifications

B8 Grade Stabilization Structure Locations and Specifications

B9 Dewatering Applications and Management Methods ii ASI Proj. No: 2022.02347

B10 Measures Utilized for Work Within Waterbodies

B11 Maintenance Guidelines for Each Stormwater Quality Measure

B12 Sequence Describing Stormwater Quality Measure Implementation Relative to Land Disturbing Activities

B13 Erosion and Sediment Control Specifications for Individual Building Lots

B14 Material Handling and Spill Prevention Plan

B15 Material Handling and Storage Procedures Associated with Construction Activity

C1 Description of Pollutants and Their Sources Associated with the Proposed Land Use13

C2 Description of Proposed Post Construction Stormwater Quality Measures

C3 Plan Details for Each Stormwater Measures

C4 Sequence Describing Stormwater Quality Measure Implementation

C5 Description of Maintenance Guidelines For Post-Construction Stormwater Quality Measures

C6 Entity That Will be Responsible for Operations and Maintenance of the Post Construction Stormwater Measures

Appendices Appendix A – Flood Insurance Rate Map Appendix B – Soils Map and Report Appendix C – National Wetland Inventory and Delineated Wetlands Map Appendix D – Project Construction Plan Set Appendix E – Special Provisions, Details, Miscellaneous Information

Page | 1

SITE NAME

The area scheduled for construction is the intersection of Hoover Road and 116th Street (hereinafter referred to as the “Project”).

PROJECT LOCATION

The “Project” is in the City of Carmel, Hamilton County, Indiana. The project is located at a latitude of 39º57’21” North and a longitude of 86º11’35” West.

OWNER’S INFORMATION

Name: City of Carmel Address: One Civic Sq.

Carmel, Indiana 46032 Representative: Bradley Pease Title: City Engineer Telephone: (317) 571-2441 Email: engineering@carmel.in.gov

OPERATOR’S INFORMATION

Same as above.

NOTICE OF INTENT

All parties defined as owners or operators must submit a Notice of Intent (NOI) at least 48 hours prior to commencement of on-site construction activities. Submittal of late NOI’s is not prohibited; however, authorization under the construction general permit is only for discharges occurring after permit coverage is granted. Unpermitted discharges may be subject to enforcement actions by the Environmental Protection Agency (EPA). For the purposes of this permit, an operator is defined as any party meeting either of the following requirements:

a) The party has operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications.

b) The party has day-to-day operational control of those activities at a project necessary to ensure compliance with a stormwater pollution prevention plan for the site or other permit conditions.

USE OF INDIANA DEPARTMENT OF TRANSPORTATION (INDOT) STANDARDS

Whenever a number reference is given, the number refers to the applicable portion of the Indiana Department of Transportation (INDOT) standard specifications (ISS).

Page | 2

A1 PLAN INDEX

Incorporated herein and Sheet 1 of the plans.

A2 VICINITY MAP

A portion of the Hamilton County Map indicating the project location is shown on the title sheet of the construction plans.

A3 PROJECT NARRATIVE

The project consists of constructing a single lane roundabout at the existing T-intersection of W 116th Street and Hoover Road in Carmel, Indiana. This project includes construction of curb and gutter, full depth HMA, and an enclosed storm sewer system. The project includes reconstruction of the existing culvert conveying Center Creek across 116th Street. This SWPPP is intended for the portion of the project involving road construction and does not include any building or construction not contained within the project limits.

A4 LATITUDE AND LONGITUDE

Latitude: 39º57’21” North Longitude: 86º11’35” West

A5 LEGAL DESCRIPTION OF THE PROJECT SITE

The project is located in Section 33, T-18-N, and Section 4, T-17-N, both in R-3-E, Clay Township, Hamilton County, Indiana. The project begins along 116th Street, approximately 320’ west of Hoover Road and extends to approximately 550’ east of Hoover Road. The project also includes Hoover Road beginning at 116th Steet and extending approximately 350’ north.

A6 11” X 17” PLAT

The property owners and boundaries are located on the Plat No. 1 sheet and on the plan and profile sheets of the construction plans.

A7 100-YEAR FLOODPLAINS, FLOODWAYS, AND FLOODWAY FRINGES

The project site is not directly adjacent to any FEMA flood zones. This information is based on the Flood Insurance Rate Map for Hamilton County, Indiana, Map Number 18057C0205G as shown in Appendix A.

A8 ADJACENT LAND USE

The adjacent land is primarily residential and recreational.

Page | 3

A9 IDENTIFICATION OF A U.S. EPA APPROVED OR ESTABLISHED TMDL

The project site is located within the Williams Creek watershed, which does not currently have a U.S. EPA approved or established Total Maximum Daily Load.

A10 IDENTIFICATION OF ALL RECEIVING WATERS

The stormwater will leave the roadway via the proposed enclosed storm sewer and will exit the project at two separate locations. Stormwater collected along the north and west legs of the roundabout will be discharged into Center Creek near the western project limits. Stormwater collected along the east leg of the roundabout will be discharged into existing storm sewer, which outlets into a private pond and eventually discharges into Center Creek. The ultimate receiving water beyond Center Creek is Williams Creek.

A11 IDENTIFICATION OF DISCHARCHES TO A WATER ON THE CURRENT 303(D)

LIST OF IMPAIRED WATERS AND THE POLLUTANT(S) FOR IMPAIRMENT

The project does not have any direct discharges to a water body on the 303(d) Listed Impaired Waters per the Environmental Protection agency (EPA) Website.

A12 SOILS MAP, INCLUDING SOIL DESCRIPTION AND LIMITATIONS

All soils information was obtained from the NRCS Web Soil Survey for Hamilton County (http://websoilsurvey.nrcs.usdgov/app/). This site contains the following soils:

approximately 10.3% Brookston silty clay loam, 0 to 2 percent slopes (Br), approximately 38.1% Crosby silt loam, fine-loamy subsoil, 0 to 2 percent slopes (CrA), approximately 51.6% Miami silt loam-urban land complex, 6 to 12 percent slopes, eroded (YmsC2). Soil type Br is classified within Hydrologic Soil Group “B/D”, soil type CrA is classified within Hydrologic Soil Group “C/D”, and soil type YmsC2 is classified within Hydrologic Soil Group “C”. Group “B” soils have a moderate rate of water transmission, group “C” soils have a slow rate of water transmission, and group “D” soils either have a very slow rate of water transmission or have the water table within 24” of the soil surface. Dual soil groups have the characteristics of group “D” soils in their natural state, but if drained, can improve to transmit water more efficiently. The soil survey map and soils report are in Appendix B. Additional details on the soil characteristics have been provided in the soil report for the project site.

A13 LOCATION AND NAME OF ALL WETLANDS, LAKES, AND WATERCOURSES ON

AND ADJACENT TO THE SITE

As seen on the National Wetland Inventory Map (Appendix C), Center Creek crosses 116th Street within the project site approximately 300’ west of Hoover Road. There are also two freshwater ponds adjacent to the project site located along the south side of 116th Street.

Page | 4

A14 STATE AND FEDERAL WATER QUALITY PERMITS

An IDEM Construction Stormwater General Permit, as well as a 401/404 permit, will be required for this project.

A15 IDENTIFICATION AND DELINEATION OF EXISTING COVER

The existing vegetative cover is primarily grass with some light trees and bushes adjacent to the existing roads and properties.

A16 EXISTING SITE TOPOGRAPHY

Refer to the plan and profile sheets and the cross-section sheets in the plans.

A17 LOCATIONS WHERE RUN-OFF ENTERS THE PROJECT SITE

Sheet flow enters the project site from adjacent street approaches, drives, and side slopes along both 116th Street and Hoover Road, and will be captured via the inlets of the proposed storm sewer network. Concentrated flow enters the project site at several locations, mainly in the form of ditches conveying runoff towards the roadway from the east. Field inlets have been proposed at each of these ditch locations to intercept the run-off, conveying it through the storm sewer network. All run-off that enters the project site has been considered in the analysis.

A18 LOCATIONS WHERE RUN-OFF DISCHARGES FROM THE PROJECT SITE PRIOR

TO LAND DISTURBANCE

Stormwater discharges from the project site via existing inlets and roadside ditches.

These features are shown in the plan and profile sheets in the plans.

A19 LOCATION OF ALL EXISTING STRUCTURES ON THE PROJECT SITE

Refer to the plan and profile sheets in the plans for existing structure locations.

A20 EXISTING PERMANENT RETENTION OR DETENTION FACILITIES, INCLUDING

MANMADE WETLANDS

No permanent retention or detention facilities within project limits.

A21 LOCATIONS WHERE STORMWATER MAY BE DIRECTLY DISCHARGED INTO

GROUND WATER, SUCH AS ABANDONED WELLS, SINKHOLES, OR KARST

FEATURES

There are no anticipated locations where stormwater may be directly discharged into ground water. Potential discharges to ground water are only those associated with surface runoff.

Page | 5

A22 SIZE OF THE PROJECT AREA

Project size = 2.20 Acres

A23 TOTAL EXPECTED LAND DISTURBANCE

Total expected land disturbance = 2.20 Acres

A24 PROPOSED FINAL SITE TOPOGRAPHY

Refer to the typical sections and the cross-section sheets in the plans.

A25 LOCATIONS AND APPROXIMATE BOUNDARIES OF ALL DISTURBED AREAS

The construction limits serve as the limits for disturbed areas. The construction limits for the project are shown on the plan and profile sheets, and erosion control sheets.

A26 LOCATIONS, SIZE, AND DIMENSIONS OF PROPOSED STORMWATER SYSTEMS

The proposed stormwater system collects water along the project and discharges it to existing drainage structures and open channels. The plan and profile sheets and construction detail sheets in the plans show the locations of the structures. Sizes and dimensions of the structures and pipes can be found in the Structure Data Table in the plans.

A27 SPECIFIC POINT WHERE STORMWATER DISCHARGE WILL LEAVE THE SITE

Stormwater runoff will leave the roadway at the road curb inlets and connect to the proposed enclosed stormwater system. The proposed enclosed stormwater system will have two outlet locations. Stormwater runoff west of Sta. 66+50 “PR-B” (approximately 230’ west of Hoover Road) outlets directly into Center Creek. East of Sta. 66+50 “PR-B”, stormwater runoff outlets into an existing storm sewer network that discharges into a private pond and eventually Center Creek. All stormwater that is not captured by the proposed storm sewer network will exit the project site via sheet flow.

All stormwater ultimately discharges to Center Creek, which outlets to Williams Creek.

The exact location where stormwater will leave the project site is summarized below:

Outlet No. 1 61+40 Rt. – Line “PR-B” Existing Open Channel Outlet No. 2 67+92 Rt. – Line “PR-B” Existing Storm Network

A28 LOCATION OF ALL PROPOSED SITE IMPROVEMENTS

The locations of the roadway construction items are shown on the typical sections, plan and profile sheets, and construction detail sheets of the plans.

Page | 6

A29 LOCATIONS OF PROPOSED SOIL STOCKPILES AND/OR BORROW/DISPOSAL

AREAS

Stockpiling of selected materials shall be in accordance with 212 and as directed by the engineer. The location of any soil stockpiles shall be determined by the Contractor.

The Contractor is directed to provide specific information regarding the location of borrow or disposal areas to IDEM Wet Weather Section and to the Soil and Water Conservation District prior to establishing the stockpiles. Information that shall be provided is listed in 203.08. See Section 205 for additional details.

A30 CONSTRUCTION SUPPORT ACTIVITIES THAT ARE EXPECTED TO BE PART OF

THE PROJECT

The road project and any construction activity related to the project will be the only work included within this Construction Stormwater General Permit. Current or future building removals, parking lot additions, or any other construction activity such as utility relocations will not be included. Should these other works include a land disturbance greater than one acre, a separate Construction Stormwater General Permit shall be submitted for these works by the entity directing operations associated with the utility relocation or other construction.

All required construction support activities including but not limited to concrete or asphalt batch plants, construction entrances, staging areas, and material storage areas shall be the responsibility of the Contractor to determine location and get approved by the Hamilton County Soil and Water Conservation District prior to construction.

A31 LOCATION OF ANY IN-STREAM ACTIVITIES

The scope of this project includes the replacement of the existing 27”x38” pipe culvert with a 24”x38” reinforced concrete elliptical pipe culvert. The culvert conveys Center Creek beneath 116th Street. All required permits for construction activities within waterways have been obtained, as discussed in section A14.

B1 DESCRIPTION OF POTENTIAL POLLUTANT SOURCES ASSOCIATED WITH

CONSTRUCTION ACTIVITIES

Pollutant sources that may be associated with construction activities on site include, but are not limited to, the following:

1. Exposed soils

2. Windblown dust

3. Leaking vehicles and equipment

4. Construction waste material

5. Fuel storage areas and fueling stations

6. Sanitary waste from temporary toilet facilities

7. Litter

8. Soil tracking off site from construction equipment

Page | 7

9. Material storage areas

10. Demolition debris

11. Fertilizers and pesticides

Construction materials that may be staged or stored on site at various points during development of the site include, but are not limited to, the following:

1. Structural fill

2. Road base

3. Drainage pipe

4. Precast concrete structures

5. Underdrain materials and geotextiles

6. Aggregate for stable construction entrance

7. Pavement marking and signing materials

8. Storm sewer structure castings

9. Riprap and geotextile

The Contractor is responsible for all construction activities and the pollutants associated with them, as well as their remediation in accordance with 108.04. The Contractor is directed to submit an amended erosion control plan to the Soil and Water Conservation District and the project owner prior to earthmoving activities.

B2 STABLE CONSTRUCTION ENTRANCE LOCATIONS AND SPECIFICATIONS

The location(s) of the construction entrance(s) for the Contractor, all subcontractors, employees, and vehicles shall be determined by the Contractor. The stable construction entrance shall be constructed as directed in the special provisions. If an area of existing roadway is to be used, the Contractor shall maintain the roadway and the area around it for conformance to the requirements stipulated in 205. The Contractor shall submit the proposed area(s) for the stable construction entrance(s) to the owner for approval and this shall be incorporated as an amendment to the

SWPPP.

B3 PERMANENT AND TEMPORARY SURFACE STABILIZATION SPECIFICATIONS

Right-of-way clearing shall be performed as needed to remove any objects such as trees, shrubs, etc., considered obstructions, as shown on the plans. Clearing shall be conducted in accordance with 201. The act of clearing and removing of obstructions may result in unintentional ground disturbances that may, in turn, result in the possibility of sediment removal from the site. The Contractor shall monitor surface stabilization throughout the removal process and implement measures necessary to maintain appropriate surface stabilization as required.

Any areas left undisturbed for more than 7 days shall be stabilized by the use of temporary seeding and temporary mulch, as directed in 205. Spring Mix will be used from January 1 to June 15 and will be applied at a rate of 150 lb/acre. Fall Mix will be used from Sept 1 through December 31 and will be applied at a rate of 150 lb/acre.

Page | 8

June 16 through August 31, temporary mulch will be used in place of temporary seeding. Mulch will be applied at a rate of 2.5 ton/acre.

Seeding or sodding shall be placed in all areas that will not be paved within the construction limits. Seeding or sodding shall be placed in all areas that will not be paved. The application rate for each seed mixture will be that as defined in 621.06. If seeding is done between May 1 and August 15, mulching shall also be placed within 24 hours of seeding. Sodding will be placed in accordance with 621.09. Sodding cannot be placed in temperatures below 35°F, if sod is frozen, or if soil is frozen.

Additional seasonal limitations are described in 621.12.

B4 SEDIMENT CONTROL MEASURES FOR CONCENTRATED FLOW AREAS

Concentrated flow areas will occur in the existing and proposed gutter areas of the roadway, as well as in existing and proposed ditches and within the Center Creek open channel. The Contractor shall be responsible for installing all sheet pile and sandbag cofferdams, temporary dewatering devices, temporary access paths, and perimeter protection for work within the waterway. The Contractor shall be responsible for providing appropriate curb inlet and ditch inlet protection for all existing and proposed inlets. The Contractor is instructed to protect all curb inlets from sediment during construction using INDOT-approved methods in accordance with 205.05(i).

Seeding and sodding shall be required in proposed roadside ditches. The locations of temporary inlet protection and waterway dewatering devices are shown in the erosion control details sheets in the plans.

B5 SEDIMENT CONTROL MEASURES FOR SHEET FLOW AREAS

Anticipated sheet flow areas are limited to the buffer area between the curb and future shared-use path, existing and proposed ditches along the roadway, and fill section side-slopes. All disturbed areas shall be temporarily seeded and temporarily mulched during construction, if left undisturbed for more than 7 calendar days, and permanently seeded or sodded upon completion of the final grade. Silt Fence is located along the toe of slopes where sediment may be washed from the right-of-way.

B6 RUNOFF CONTROL MEASURES

Runoff will be controlled by temporary seeding and temporary mulching, if disturbed ground is left undisturbed more than 7 calendar days, and silt fence. Temporary seeding, temporary mulching, and filter sock shall be done in accordance with INDOT Standard Specification 205.04(a), 205.04(b), and 205.06(a).

B7 STORMWATER OUTLET PROTECTION LOCATIONS AND SPECIFICATIONS

The stormwater outlets that discharge into existing open channels will have permanent riprap on geotextiles for protection against scour. No additional measures are needed at locations where the storm water outlets to an existing enclosed storm water system.

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B8 GRADE STABILIZATION STRUCTURE LOCATIONS AND SPECIFICATIONS

There are not any grade stabilization structures required for this project. However, it is the responsibility of the Contractor to notify the engineer of any areas appearing to be eroding so adequate grade stabilization measures may be employed.

B9 DEWATERING APPLICATIONS AND MANAGEMENT METHODS

A temporary pump around is required for the replacement of the existing culvert conveying the Center Creek near the west end of the project. The configuration of the pump around can be seen on the Erosion Control sheets of the plans. The Contractor shall be responsible for conducting all dewatering activities as shown in the plans, and any additional dewatering activates if deemed necessary during excavation. The Contractor is also responsible for the treatment of any discharged water with an appropriate sediment control measure.

B10 MEASURES UTILIZED FOR WORK WITHIN WATERBODIES

Temporary cofferdams are required as part of the temporary pump around that will be utilized to divert the Center Creek waterway during the replacement of the culvert at 116th Street. The Contractor shall be responsible for conducting all in-stream work as shown in the plans. The Contractor is also responsible additional temporary measures deemed necessary for work within the waterbody.

B11 MAINTENANCE GUIDELINES FOR EACH STORMWATER QUALITY MEASURE

The monitoring and maintenance of all temporary erosion control measures shall be in accordance with 205. Regular inspections of all erosion control measures shall occur at least once weekly. In addition to regular weekly inspections, a post-event inspection shall occur within 24hrs of each 0.5-inch storm event.

Construction Entrance

Locations where vehicles exit the site shall be inspected for evidence of off-site sediment tracking.

Material Storage Inspection

Inspectors must evaluate areas used for storage of materials exposed to precipitation to ensure materials are protected and/or impounded so pollutants cannot discharge from storage areas.

Material Handling and Spill Prevention

Discharge of hazardous substances or oil into stormwater is subject to reporting requirements. In the event of a spill, the Contractor is required to notify the National Response Center (1-800-424-8802) to properly report the spill. In addition, the Contractor shall submit a written description of the release, including type and amount

Page | 10 of materials released, date of release, circumstances, and steps taken to prevent future spills, to the City of Carmel Department of Public Works.

Notice of Termination

Compliance of the site with the NOI remains the responsibility of the contractor and sub-contractors until such time as a Notice of Termination (NOT) has been submitted by the owner. The owner will submit the NOT once all construction activities have been completed and final approval has been granted to the contractor.

B12 SEQUENCE DESCRIBING STORMWATER QUALITY MEASURE

IMPLEMENTATION RELATIVE TO LAND DISTURBING ACTIVITIES

Due to construction phasing, the sequence outlined below may be repeated for each phase.

1. Install temporary erosion control measures appropriate for stable construction, entrance construction and right-of-way clearing

2. Install construction entrances and perimeter controls

3. Site clearing

4. Install temporary erosion control measures in disturbed areas

5. Begin earthwork operations

6. Install staging areas, material storage areas, fueling stations, and protection measures

7. Temporarily seed and temporary mulch disturbed areas if to be undisturbed for more than 7 days

8. Install inlet protection measures

9. Begin structure and pipe installations

10. Complete subgrade operations

11. Paving and curb and gutter operations

12. Final grade, seed, and sod

The Contractor may be required to adjust the proposed erosion control plan as needed for the construction phasing of the project. The Contractor is required to submit a plan for their sequence of operations and implementation of erosion control measures following awarding of the contract to the City of Carmel Department of Public Works.

B13 EROSION AND SEDIMENT CONTROL SPECIFICATIONS FOR INDIVIDUAL

BUILDING LOTS

There are no individual building lots associated with this project.

B14 MATERIAL HANDLING AND SPILL PREVENTION PLAN

Materials handling and prevention plans shall be the responsibility of the contractor. In the event of an environmental spill, the spill shall be stabilized and contained first. The contractor shall then notify IDEM immediately at (888) 233-7745. Cleanup of the spill should occur as soon as possible once the spill is stabilized and contained.

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Materials Handling and Spill Prevention

Materials should be stored in a manner that prevents or minimizes the chance a spill will reach soils, groundwater, or surface water. Materials stored inside shall be placed in a manner to prevent a spill from migrating outside the confines of the building or into any drain leaving the building and discharging to soils, groundwater, or surface water.

If a spill does occur, then the spill must be contained immediately utilizing appropriate response techniques, including diking and absorbents. Clean up of the spill should occur as soon as possible once the spill is stabilized and contained. Spills shall be cleaned up using acceptable methods, such as absorbents on impervious surfaces or removal of contaminated soils. In all cases, cleanup standards must adhere to local state, and federal requirements. Failure to clean up any spill is a violation of the Indiana State Spill Rule (327 IAC 2-6.1), which is enforced by IDEM. Certain spills must be reported to the local response agency, Local Emergency Planning Committee and/or IDEM. Initial calls should be made to the 911 system if the spill exceeds reportable quantities or is a threat to public safety.