CN-370000-BS135-T23CO3.pdf

ATTACHMENT D – TASK ASSIGNMENT CHANGE ORDER FORM

Task Assignment Number: ____________ Date: ______________ Change Order No.________

Contractor Name: ______________________________________________

Contractor Representative: ________________________________ Phone: ____________________

DEP Contract Manager: _____________________________________ Phone: ____________________

Description of Change (Use Additional Sheets if necessary):

CHANGE IN TASK AMOUNT

Item Fee Schedule Cost Reimbursement Total

Original Task Amount:

Task Amount Prior to this Change Order:

Net Increase/Decrease in Task Amount:

Task Amount with all Change Orders:

CHANGE IN TASK TIME

Original Task Completion Date:

Completion Date Prior to This Change:

Net Increase/Decrease in Task Period:

Completion Date with all Change Orders:

CONTRACTOR FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION

Project Principal Date Project Manager

Contract Manager

Cost Administrator

Approval

Division Director

Date

Date

Date

Date cc: DEP Procurement Section (MS93), Bureau of Finance and Accounting (MS78) – 2 copies

23 3/17/2025 3

Mott MacDonald Florida, LLC

Amber Kirk 850-490-1209

Chelsey Sliger 850-245-8021

A scope revision is requested to extend the deliverable dates for Project 1 (Tasks 1, 2, and 3) and Project 2 (Tasks 4, 5, 6, and 7). Deliverable dates for the final tasks (Project 2, Tasks 8 and 9) remain unchanged as reflected in the attached revised scope with an updated deliverables schedule.

DEP CONTRACT NO. BS135-A1

$158,413.30 $158,413.30

$158,413.30 $158,413.30

$158,413.30 $158,413.30 $0.00 $0.00

01/30/2026

01/30/2026 0 days

01/30/2026 j t Principal 03/17/2025

Tracy Woods Digitally signed by Tracy Woods Date: 2025.03.20 13:41:39 -04'00'

Chelsey E.

Sliger

Digitally signed by Chelsey E. Sliger Date: 2025.03.24 12:41:15 -04'00'

Digitally signed by Avery Lehmann Date: 2025.03.25 10:13:18 -04'00'

Digitally signed by John Coates Date: 2025.03.25 17:59:43 -04'00'

FDEP Contract BS 135, Task Assignment No. 23, Project 1 – Inundation Modeling and Mapping for Flint Creek Dam Structure at Lake Thonotosassa, Hillsborough County, FL, and Project 2 – Inundation Modeling and Mapping for P-3 Dam Structure and P-1 Dam Structure, Polk County, FL

SCOPE OF SERVICES

Original: October 2024 Change Order 3: 3/17/2025

Background and Project Description:

The State of Florida Dam Safety Program (FDSP) is administered by the Program and Technical Services Program in the Division of Water Resource Management, Florida Department of Environmental Protection (FDEP). The Florida National Dam Safety Program Grant for FY2024 (FDEP BIL24) has approved the use of grant funds to prepare Inundation Mapping for development of an Emergency Action Plan (EAP) for several High Hazard Potential (HHP) dams in Florida. This proposal is for conducting the inundation modeling and mapping work activities to support the preparation of two EAPs (not included) for the following HHP dam systems (Refer to the Figure 1 and Figure 2 in Appendix B):

DAM NID ID# FL12037- Flint Creek Dam Structure at Lake Thonotosassa, Hillsborough County, FL

DAM NID ID# FL12011- P-3 Dam Structure at Lake Arietta, Polk County, FL DAM NID ID# FL13345 - P-1 Dam Structure at Lake Lena, Polk County, FL

The objective is to:

Complete a Dam Break inundation study and support data for one EAP for the Flint Creek Dam Structure, which is owned and managed by the Southwest Florida Water Management District (SWFWMD).

Complete a Dam Break inundation study and support data for one EAP for the P-3 and P-1 Dam Structures system, which are owned and managed by the SWFWMD.

The Flint Creek Dam Structure impounds Lake Thonotosassa and is in the Hillsborough River Basin and is part of the Pemberton Creek/ Baker Canal watershed. Lake Thonotosassa is situated roughly 14 miles northeast of Tampa and is Hillsborough County’s largest lake and is owned and managed by the SWFWMD. Refer to Figure 2 in Appendix B. The P-3 Dam Structure forms the outlet works for Lake Arietta impoundment and is located on the P-3 outfall canal between Lake Arietta and Lake Whistler, approximately 600 feet downstream of Lake Arietta. Furthermore, it is located one mile northwest of Auburndale in Polk County, in the Peace River Basin. P-3 controls the outfall of Lake Arietta and flows to Lake Whistler which discharges to Lake Ariana and then to Lake Lena.

Refer to Figure 1 in Appendix B. The P-1 Dam Structure forms the outlet works for Lake Lena and regulates the Lake surface water elevation for freshwater storage, recharge, and recreation. It is located on the south end of Lake Lena on the north side of a box culvert under an abandoned roadway near the west junction of State Road 544 and US 92 in Auburndale in Polk County in the Peace River Basin. Refer to Figure 1 in Appendix B.

The scope of the work effort will be to conduct Inundation Modeling and Inundation Mapping for the No Dam Break and Dam Break scenarios at each of the above-mentioned dam structures and provide supporting data for the development of the EAPs. For this project, the consultant shall analyze two scenarios of failure at each dam (e.g., piping at the dam outlet sluice gates and overtopping of the top of gate structure dam embankment location), under Sunny Day conditions, and during the 100 - year (yr) and Probable Maximum Precipitation (PMP) storm events. In addition, the possible sequential dam failure of the downstream P-1 dam structure will be analyzed for the hypothetical dam failure of the upstream P-3 dam structure during the PMP storm event.

Note the latest available LIDAR information (2017 /2018) as obtained from SWFWMD, will be used in conjunction with the Hillsborough County and Polk County GIS Platform data, with all data reported in NAVD88 datum.

The purpose of this project is to:

1) Provide FDEP and the Dam Owner with the required dam break Inundation Mapping to support the comprehensive Emergency Action Plan (EAP) for identified flooding impact areas which may confirm a High Hazard Potential risk for each dam system.

2) Simulate No Dam break dam break condition for each dam structure during 100-year storm, ½ PMP and PMP storm events and prepare matching inundation maps based on the results.

3) Simulate Dam break dam break conditions for each dam based on the Sunny Day condition, and during both the 100-year storm and PMP storm events and prepare matching inundation maps based on the results. In addition, the sequential dam break of the downstream P-1 Dam Structure, resulting from the failure of the upper P-3 dam structure will be simulated and flood wave and peak water surface elevations provided for critical downstream locations.

4) The HEC-HMS computer program in conjunction with the HEC-RAS modeling program shall be utilized for the modeling activity. Each dam shall be modeled for the 100- year 24- hour storm obtained from the National Oceanic and Atmospheric Administration (NOAA) Atlas 14, Point Precipitation Frequency Estimates; and the PMP storm estimate shall use the methodology from the NOAA HYDROMETEOROLOGICAL REPORT No.51, Probable Maximum Precipitation Estimates, United States East of the 105th Meridian, all published by the US Dept. of Commerce.

5) Prepare a comparative Table of Flooding Inundation impacts on downstream structures for the No Dam Break versus Dam Break scenarios.

6) Dam Break Inundation Mapping for each dam site and associated downstream locations shall depict flood inundation elevation extents, flood velocities, peak wave depths, and peak wave arrival times at selected downstream locations.

Tasks within the Scope of Work:

Perform Inundation Modeling and Mapping for inclusion in the FDEP Emergency Action Plan Template for Florida Dams (hereafter referred to as the EAP Template); and provide the supporting data for the development of one EAP for the Flint Creek Dam Structure and one EAP for the P-3 and P-1 Dam Structures system. The Inundation modeling necessary for the development of the EAPs will require conducting dam break analyses (using computer modeling) and preparing inundation maps based on HEC - RAS 6.0.7, as updated. The work will consist of the following tasks:

Project 1: Task 1, Task 2 and Task 3

Task 1: No Dam Break Condition Inundation Modeling and Mapping for Flint Creek Dam Structure at Lake Thonotosassa

Produce a hydrologic and hydraulic routing analysis report for the Flint Creek dam structure at Lake Thonotosassa for the No Dam Break condition to include:

1.1 Utilizing the merged DEM/BEM product in electronic format for the Flint Creek Dam Structure at Lake Thonotosassa project study area, with GIS shape files developed in prior Task 3 of Task Assignment No.18, including the elevation storage data for conducting the hydrologic and 2D Hydraulic Inundation Modeling and Mapping work activity.

1.2 Using the HEC-HMS computer program in conjunction with the HEC-RAS modeling program for the hydrologic and hydraulic analyses develop the flood modeling domain for the project watershed area. The project domain watershed consists of a part of the Pemberton Creek/ Baker Canal watershed and the Campbell Branch tributary contributing drainage area east of the lake and local Flint Creek runoff downstream of US Highway 301 to the confluence with the larger Hillsborough River watershed area (Refer to Figure 2 in Appendix B). The larger Hillsborough River watershed area is not included as part of the contributing flooding domain, as flood flows from extreme storm events will arrive at the confluence with Flint Creek several hours after the peak flood flows from Flint Creek have passed.

1.3 Conduct routing and dam overtopping analysis for the Flint Creek Structure for the 100-year 24-hour, the ½ PMP and PMP storm events under the No Dam Break condition and use the results to prepare Inundation Mapping.

1.4 Prepare Inundation Mapping and a Table comparing the results of the 100-year 24-hour, and PMP storm events No Dam Break scenarios maximum flood elevation and maximum flood depths above ground at selected downstream points of interest.

DDELIVERABLES:

1). Electronically submit the No Dam Break Flood Inundation Maps for the Flint Creek dam structure site and downstream locations including a Table listing maximum flood elevations and maximum flood depths and corresponding travel times. These maps will serve as an Appendix to the Inundation Modeling and Mapping report.

2). Electronically submit a Draft Inundation Modeling and Mapping Report which includes results of the 100-year 24-hour storm computer modeling, the ½ PMP and the PMP storm overtopping analyses for the No Dam Break scenario for the dam site. The report shall contain the project information, analysis assumptions, methodology, input and output data and GIS files including Inundation Map(s) for review by FDEP staff.

3). After approval of the Draft Report for the No Dam Break Inundation Model analysis and Mapping is received, submit the Final electronic version of the Report including all associated modeling data and incorporating the responses to FDSP review comments.

Performance Measure: Deliverables will be reviewed by the Department to confirm that they are complete, accurate, and timely.

Task 2: Dam Break Inundation Modeling for Flint Creek Dam structure at Lake Thonotosassa

2.1 Perform Breach Analysis - Sunny Day Modeling for Flint Creek Dam structure (piping)

2.2 Perform Breach Analysis - 100yr Modeling for Flint Creek Dam structure (piping/ overtopping)

2.3 Perform Breach Analysis - PMP Modeling for Flint Creek Dam structure (overtopping)

2.4 Perform comparative Breach Scenarios Analyses and prepare Modeling results Tables , including comparative depths between No Dam Break and Dam Break scenarios

2.5 Prepare Draft Inundation Modeling Report

2.6 Prepare Final Inundation Modeling Report

1). Electronically submit a Draft of Inundation Modeling Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios for Flint Creek dam, which includes the project information, analysis assumptions, methodology, input and output data for breach scenarios, Modeling results Tables and Figures for review by FDEP staff.

2). After approval of the Draft Report is received, electronically submit a final version of the Inundation Modeling Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios for the Flint Creek Dam structure and all associated modeling data.

The final electronic version shall incorporate the responses to FDEP review comments on the draft report.

Task 3: Dam Break Inundation Mapping including EAP Dam Failure Maps for Flint Creek Dam Structure at Lake Thonotosassa

3.1 Prepare Inundation Mapping - Sunny Day Breach for Flint Creek Dam structure.

3.2 Prepare Inundation Mapping - 100-year Breach for Flint Creek Dam structure.

3.3 Prepare Inundation Mapping - PMP Breach for Flint Creek Dam structure.

3.4 Prepare Comparative Breach Inundation Mapping - Sunny Day and 100-year for Flint Creek Dam structure.

3.5 Prepare Comparative Breach Inundation Mapping - Sunny Day and PMP events for Flint Creek

Dam structure.

3.6 Prepare Comparative Breach Inundation Mapping - 100 year and PMP for Flint Creek Dam structure.

3.7 Prepare EAP Dam Failure Map to include Sunny Day, 100 Year and PMP dam break events, including the maximum flooding depth above ground at structures, peak flood wave arrival time and peak velocities.

3.8 Prepare downstream impacted properties map for maximum inundation extent from breach, including highlighting the maximum flooding above ground at structures.

3.9 Compile Draft Dam Break Inundation Mapping Report, including the engineering data for tables to be included in the EAP.

3.10 Compile Final Dam Break Inundation Mapping Report.

DELIVERABLES:

1). Electronically submit a Draft of the Dam Break Inundation Mapping Report for the Sunny Day Dam Break 100-year Dam Break and PMP Dam Break scenarios for the Flint Creek Dam structure, which includes the project information, analysis assumptions, methodology, input and output data for breach scenarios, Tables and Figures for review by FDEP staff.

2). After receiving FDSP approval, electronically submit a final version of the Dam Break

Inundation Mapping Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios for the Flint Creek Dam structure. The final electronic version shall incorporate the responses to FDEP review comments on the draft report.

Performance Measure: Deliverables will be reviewed by the Department to confirm that they are complete, accurate, and timely.

Project 2: Task 4, Task 5, Task 6, Task 7, Task 8, and Task 9

Task 4: No Dam Break Condition Inundation Modeling and Mapping for P-3 Dam Structure at Lake Arietta

Produce a hydrologic and hydraulic routing analysis report for the P-3 dam structure at Lake Arietta for the No Dam Break condition to include:

4.1 Utilizing the merged DEM/BEM product in electronic format for the P-3 Dam Structure at Lake

Arietta project study area, with GIS shape files developed in prior Task 3 of Task Assignment No.18, including the elevation storage data for conducting the hydrologic and 2D Hydraulic Inundation Modeling and Mapping work activity.

4.2 Using the HEC-HMS computer program in conjunction with the HEC-RAS modeling program for the hydrologic and hydraulic analyses develop the flood modeling domain for the project watershed area. P-3 structure controls the outfall to Lake Arietta and flows to Lake Whistler which discharges to Lake Ariana and then to Lake Lena. Refer to Figure 1 Appendix B. The project domain watershed consists of a part of the Peace River Basin within the Lake Hancock watershed.

4.3 Conduct routing and dam overtopping analysis for the P-3 Structure for the 100-year 24 hour, the ½ PMP and PMP storm events under the No Dam Break condition and use the results to prepare Inundation Mapping.

4.4 Prepare Inundation Mapping and a Table comparing the results of the 100-year 24-hour, ½ PMP and PMP storm events No Dam Break scenarios maximum flood elevation and maximum flood depths above ground at selected downstream points of interest.

1). Electronically submit the No Dam Break Flood Inundation Maps for the P-3 Dam Structure site and downstream locations showing maximum flood elevations and maximum flood depths including a Table with corresponding travel times. These maps will serve as an Appendix to the Modeling and Mapping report.

2). Electronically submit a Draft Inundation Modeling and Mapping report which includes the

100-year 24-hour storm computer modeling, the ½ PMP and the PMP storm overtopping analyses for the No Dam Break scenarios for the dam site. The report shall contain the project information, analysis assumptions, methodology, input and output data and GIS files including Inundation Map(s) for review by FDEP staff.

3). After approval of the Draft Report for the No Dam Break Inundation Model analysis and

Mapping is received, submit the Final Report electronic version including all associated modeling data and incorporating the responses to FDSP review comments.

Performance Measure: Deliverables will be reviewed by the Department to confirm that they are complete, accurate, and timely.

Task 5: Dam Break Inundation Modeling for P-3 Dam Structure at Lake Arietta

5.1 Perform Breach Analysis - Sunny Day Modeling for P-3 Dam structure (piping)

5.2 Perform Breach Analysis - 100yr Modeling for P-3 Dam structure (piping/ overtopping)

5.3 Perform Breach Analysis - PMP Modeling for P-3 Dam structure (overtopping)

5.4 Perform comparative Breach Scenarios Analyses and prepare Modeling results Tables, including comparative depths between No Dam Break and Dam Break scenarios

5.5 Prepare Draft Inundation Modeling Report

5.6 Prepare Final Inundation Modeling Report

1). Electronically submit a draft of Inundation Modeling Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios for P-3 Dam Structure, that includes the project information, analysis assumptions, methodology, input and output data for breach scenarios, Tables and Figures for review by FDEP.

2). After approval of the Draft report is received, electronically submit a final version of the Inundation Modeling Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios for the P-3 Dam structure and all associated modeling data. The final electronic version shall incorporate the responses to FDEP review comments on the draft report.

Task 6: Dam Break Inundation Mapping including EAP Dam Failure Maps for P-3 Dam Structure at Lake Arietta

6.1 Prepare Inundation Mapping - Sunny Day Breach for P-3 Dam structure.

6.2 Prepare Inundation Mapping - 100-year Breach for P-3 Dam structure.

6.3 Prepare Inundation Mapping - PMP Breach for P-3 Dam structure.

6.4 Prepare Comparative Breach Inundation Mapping - Sunny Day and 100-year for P-3 Dam structure.

6.5 Prepare Comparative Breach Inundation Mapping - Sunny Day and PMP events for P-3 Dam structure

6.6 Prepare Comparative Breach Inundation Mapping - 100 year and PMP for P-3 Dam structure.

6.7 Prepare EAP Dam Failure Map to include Sunny Day, 100 Year and PMP dam break events, including the maximum flooding depth above ground at structures, peak flood wave arrival time and peak velocities

6.8 Prepare downstream impacted properties map for maximum inundation extent from breach, including highlighting the maximum flooding above ground at structures

6.9 Compile Draft Dam Break Inundation Mapping Report, including the engineering data for tables to be included in the EAP.

6.10 Compile Final Dam Break Inundation Mapping Report.

1). Electronically submit a draft of the Dam Break Inundation Mapping Report for the Sunny Day Dam Break 100-year Dam Break and PMP Dam Break scenarios for the P-3 Dam structure, that includes the project information, analysis assumptions, methodology, input and output data for breach scenarios, Tables and Figures for review by FDEP staff.

PMP Dam Break scenarios for the P-3 Dam structure. The final electronic version shall incorporate the responses to FDEP review comments on the draft report.

Task 7: No Dam Break Condition Inundation Modeling and Mapping for P-1 Dam Structure at Lake Lena

Produce a hydrologic and hydraulic routing analysis report for the P-1 dam structure at Lake Lena for the No Dam Break condition to include:

7.1 Utilizing the merged DEM/BEM product in electronic format for the P-1 Dam Structure at Lake Lena project study area, with GIS shape files developed in prior Task 3 of Task Assignment No.18, including the elevation storage data for conducting the hydrologic and 2D Hydraulic Inundation Modeling and Mapping work activity.

7.2 Using the HEC-HMS computer program in conjunction with the HEC-RAS modeling program for the hydrologic and hydraulic analyses develop the flood modeling domain for the project watershed area. The P-1 structure controls the outflows from Lake Lena to Lake Lena Run and passing the flows south to Lake Hancock. Refer to Figure 1 Appendix B. The project domain watershed consists of a part of the Peace River Basin within the Lake Hancock watershed.

7.3 Conduct routing and dam overtopping analysis for the Flint Creek Structure for the 100-year 24-hour, the ½ PMP and PMP storm events under the No Dam Break condition and prepare Inundation Maps based on the results.

7.4 Prepare Inundation Mapping and a Table comparing the results of the 100-year 24-hour, ½ PMP and PMP storm events No Dam Break scenarios maximum flood elevation and maximum flood depths above ground at selected downstream points of interest.

1). Electronically submit Flood Inundation Maps for the P-1 Dam structure site and downstream locations showing maximum flood elevations and maximum flood depths including a Table with corresponding travel times. These maps will serve as an Appendix to the Modeling and Mapping report.

2). Electronically submit a Draft Inundation Modeling and Mapping report which includes the 100-year 24-hour storm computer modeling, the ½ PMP and the PMP storm overtopping analyses for the No Dam Break scenarios for the dam site. The report shall contain the project information, analysis assumptions, methodology, input and output data and GIS files including Inundation Map(s) for review by FDEP staff.

3). After approval of the Draft Report for the No Dam Break Inundation Model analysis and Mapping is received, submit the Final Report electronic file including all associated modeling data and incorporating the responses to FDSP review comments.

Task 8: Dam Break Inundation Modeling for P-1 Dam Structure at Lake Lena

8.1 Perform Breach Analysis - Sunny Day Modeling for P-1 Dam structure (piping)

8.2 Perform Breach Analysis - 100yr Modeling for P-1 Dam structure (piping/ overtopping)

8.3 Perform Breach Analysis - PMP Modeling for P-1 Dam structure (overtopping)

8.4 Perform Sequential Breach Analysis - PMP Modeling for P-3 and P-1 Dam failures.

8.5 Perform comparative Breach Scenarios Analyses and prepare Modeling results Tables.

8.6 Prepare Draft Inundation Modeling Report.

8.7 Prepare Final Inundation Modeling Report.

1). Electronically submit a draft of Inundation Modeling Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios for P-1 Dam Structure, that includes the project information, analysis assumptions, sequential analysis of P-3 and P-1 tandem failures, methodology, input and output data for breach scenarios, Tables and Figures for review by FDEP.

2). After approval of the Draft report is received, electronically submit the Final Inundation Modeling Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios for the P-1 Dam structure including associated modeling data.

The final electronic version shall incorporate the responses to FDEP review comments on the draft report.

Task 9: Dam Break Inundation Mapping including EAP Dam Failure Maps for P-1 Dam Structure at

Lake Lena

9.1 Prepare Inundation Mapping - Sunny Day Breach for P-1 Dam structure.

9.2 Prepare Inundation Mapping - 100-year Breach for P-1 Dam structure.

9.3 Prepare Inundation Mapping - PMP Breach for P-1 Dam structure.

9.4 Prepare Sequential Breach Inundation Mapping - PMP Breach for P-3 and P-1 Dam failures.

9.5 Prepare Comparative Breach Inundation Mapping - Sunny Day and 100-year for P-1 Dam structure.

9.6 Prepare Comparative Breach Inundation Mapping - Sunny Day and PMP events P-1 Dam structure.

9.7 Prepare Comparative Breach Inundation Mapping - 100 year and PMP for P-1 Dam structure.

9.8 Prepare EAP Dam Failure Map to include Sunny Day, 100 Year and PMP dam break events, including the maximum flooding depth above ground at structures, peak flood wave arrival time and peak velocities

9.9 Prepare downstream impacted properties map for maximum inundation extent from breach, including highlighting the maximum flooding above ground at structures

9.10 Compile Draft Dam Break Inundation Mapping Report, including the engineering data for tables to be included in the EAP.

9.11 Compile Final Dam Break Inundation Mapping Report.

1). Electronically submit a draft of the Dam Break Inundation Mapping Report for the Sunny Day Dam Break 100-year Dam Break and PMP Dam Break scenarios for the P-1 Dam structure, that includes the project information, analysis assumptions, sequential analysis of P-3 and P-1 tandem failures, methodology, input and output data for breach scenarios, including Tables and Figures for review by FDSP.

PMP Dam Break scenarios for the P-1 Dam structure. The final electronic version shall incorporate the responses to FDSP review comments on the draft report.

Key Personnel

FDEP

Role Name Entity

Project Manager Tracy Woods FDEP Contract Manager Deneka Smith FDEP

Mott MacDonald Role Name Entity

Project Principal David Skipper Mott MacDonald Principal Project Manager Amber Kirk Mott MacDonald

Principal Engineer Michael Cox Comak Group

Project Schedule: CONSULTANT is available to begin work on this project immediately following receipt of the executed Task Assignment from FDEP.

Compensation and Method of Payment

Compensation to be paid to the Consultant for providing the services described herein shall be on a fixed-price basis for each Task Deliverable. No compensation will be paid for services and/ or tasks that are not performed. The fixed-price compensation for the Deliverable shall be as listed in the detailed Payment and Deliverables Schedule Table. See Appendix A for Payment and Deliverables Schedule Table.

The Consultant will submit invoices to the FDEP for work performed at the completion and acceptance by FDEP of the final deliverable. The invoicing will be accompanied by a brief description of the work effort completed, including deliverables achieved, in accordance with the attached Fee Schedule. Compensation will not be paid for a deliverable until the deliverable has been completed and accepted by the FDEP.

AUTHORIZATION

The following individual is a representative for the CONSULTANT with the authority to enter.

into a binding Contract with the FDEP:

Signature Date

03/17/2025

Name and Title

David Skipper, PE – Senior Vice President

Company Name

Mott MacDonald Florida, LLC

Name and Title

Appendix A

PAYMENT AND DELIVERABLES SCHEDULE

For all tasks, payment shall be made on a fixed price basis in the fixed amounts specified below for each deliverable following receipt and acceptance by the FDSP in accordance with Contract Terms.

Deliverable Deliverable Description Due Date

Total Payment Amount

Project 1

Task 1

No Dam Break Condition Inundation Modeling and Mapping for Flint Creek Dam Structure at Lake Thonotosassa

1) Electronically submit the No Dam Break Flood Inundation Maps for dam structure site and d/s locations, with Max Flood depths and elevations

2) Electronically submit a Draft Inundation Modeling and Mapping Report including 100-year storm modeling, ½ PMP and the PMP storm overtopping analyses.

3) After approval of the Draft document, submit the Final No Dam Break electronic version of the Report.

01/31/2025 04/28/2025

02/14/2025 04/28/2025

02/28/2025 05/09/2025

$ 14,894.64

Project 1

Task 2

Dam Break Inundation Modeling for Flint Creek Dam Structure at Lake Thonotosassa

1) Electronically submit a Draft Inundation Modeling Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios.

2) After approval of the Draft Report, electronically submit the Final Inundation Modeling Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios.

03/21/2025 05/30/2025

04/09/2025 06/16/2025

$ 14,969.68

Project 1

Task 3

Dam Break Inundation Mapping including EAP Dam Failure Maps for Flint Creek Dam Structure at Lake Thonotosassa

1) Electronically submit a Draft of the Dam Break Inundation Mapping Report for the Sunny Day Dam Break 100-year Dam Break and PMP Dam break scenarios, and Draft EAP Dam Failure map.

2) After approval of Draft documents, submit the Final Dam Break Inundation Mapping Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios, and Final EAP Dam Failure map.

04/25/2025 06/30/2025

05/16/2025 07/11/2025

$ 16,255.56

Project 2

Task 4

No Dam Break Condition Inundation Modeling and Mapping for P-3 Dam Structure at Lake Arietta

1) Electronically submit the No Dam Break Flood Inundation Maps for the P-3 dam structure site & d/s locations with Max depths /elevations.

2) Electronically submit a Draft No Dam Break Inundation Modeling and Mapping Report which includes results of the 100-year 24-hour storm computer modeling, the ½ PMP and the PMP storm overtopping analyses.

06/13/2025 08/18/2025

07/03/2025 08/18/2025

3) After approval of the Draft Report, Submit the Final No Dam Break Inundation Modeling and Mapping report.

08/01/2025 08/29/2025

$14,859.12

Project 2

Task 5

Dam Break Inundation Modeling for P-3 Dam Structure at Lake Arietta

1) Electronically submit a draft of Inundation Modeling Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios for P-3 Dam Structure, which includes the project information, analysis assumptions, methodology, input and output data for breach scenarios, Tables and Figures for review by FDEP.

2) After approval of the Draft report submit the Final Inundation Modeling Report for the Sunny Day, 100-year and PMP Dam failures.

08/15/2025 09/15/2025

08/29/2025 09/29/2025

$15,451.32

Task 6

Dam Break Inundation Mapping including EAP Dam Failure Maps for P-3 Dam Structure at Lake Arietta

1) Electronically submit a draft of the Dam Break Inundation Mapping Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios for the P-3 Dam structure, and the EAP Dam Failure Maps.

2) After approval of the Draft document, submit the Final Dam Break Inundation Mapping Report for Sunny Day, 100-year and PMP Dam failures and the EAP Dam Failure Maps.

09/12/2025 10/10/2025

09/26/2025 10/24/2025

$15,799.20

Task 7

No Dam Break Condition Inundation Modeling and Mapping for P-1 Dam Structure at Lake Lena 1)Electronically submit Flood Inundation Maps for the P-1 Dam structure site and d/s locations with maximum flood depths and elevations.

2) Electronically submit Draft Inundation Modeling and Mapping report for 100-yr, 1/2 PMP and PMP storms with overtopping analyses.

3) After approval of the Draft documents, submit the Final Dam Break Inundation Modeling analysis and Mapping, submit the Final Report electronic file including all associated modeling data and incorporating the responses to FDSP review comments.

10/17/2025 11/17/2025

10/31/2025 11/17/2025

11/14/2025 12/01/2025

$15,945.20

Task 8

Dam Break Inundation Modeling for P-1 Dam Structure at Lake Lena

1) Electronically submit a draft of Inundation Modeling Report for the Sunny Day Dam Break, the 100-year Dam Break and PMP Dam Break scenarios for P-1 Dam Structure

2) After approval of the Draft report, submit the Final Inundation Modeling Report for the Sunny Day, 100-year and PMP Dam failures.

12/19/2025

01/09/2026

$ 24,033.62

Task 9

Dam Break Inundation Mapping including EAP Dam Failure Maps for P- 1 Dam Structure at Lake Lena

1) Electronically submit a draft of the Dam Break Inundation Mapping Report for the Sunny Day Dam Break, 100-year Dam Break and PMP Dam Break scenarios for the P-1 Dam structure, including the EAP Failure Maps (for worst case dam failure).

2) After receiving FDSP approval on the Draft Report, submit the Final Dam Break Inundation Mapping Report for Sunny Day, 100-year and PMP Dam failures, and the EAP Failure maps (for worst case dam failure).

01/16/2026

01/30/2026

$ 26,204.96

Total $ 158,413.30

Appendix B

Figures

Figure 1: Structure P-3 at Lake Arietta and Structure P-1 at Lake Lena, Location Overview

Figure 2: Flint Creek Structure at Lake Thonotosassa, Location Overview