ATTACHMENT D TASK ASSIGNMENT CHANGE ORDER FORM

DEP CONTRACT NO.__BS135____

Task Assignment Number: 15_________

Date: _1-3-2023__________

Change Order No._1_______

Contractor Name:

__Mott MacDonald_____________________________________

Contractor Contract Manager: _James Johnson______________________

Phone: ____850-688-9166_____

DEP Contract Manager: __Genita Alexander_________________________

Phone: ____850-245-8021_____

Description of Change (Use Additional Sheets if necessary:

Task Description: A scope revision is requested to extend the deliverable dates to acquire the survey data necessary for design. A revised scope with an updated deliverables schedule is attached.

CHANGE IN TASK AMOUNT

Item Fee Schedule Cost Reimbursement

Total

Original Task Amount: $79,585.00 $21,376.00 $100,961.00

Task Amount Prior to this Change Order: $79,585.00 $21,376.00 $100,961.00

Net Increase/Decrease in Task Amount: $0.00 $0.00 $0.00

Task Amount with all Change Orders: $79,585.00 $21,376.00 $100,961.00

CHANGE IN TASK TIME

Original Task Completion Date: July 28, 2023

Completion Date Prior to This Change: July 28, 2023

Net Increase/Decrease in Task Period: 0 days

Completion Date with all Change Orders: July 28, 2023

CONTRACTOR

FLORIDA DEPARTMENT OF ENVIRONMENTAL PROTECTION

1/3/2023

Project Principal David Skipper

Date Project Manager Tracy Woods

Contract Manager

Date

Date

Genita Alexander

APPROVED:

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

Operation Plan for Shadow Run Dam, Riverview, Hillsborough County, FL - Inundation Modeling and Mapping for

Gibbs Avenue Dam, and Ketter Causeway Dam, Saratoga Harbor, Putnam County, FL

SCOPE OF SERVICES

Background and Project Description:

The State of Florida Dam Safety Program (FDEP) is administered by the Stormwater 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 FY2022 has awarded grant funds to support the Florida Dam Safety Program. This proposal is for the preparation of an Operations Plan for Shadow Run Dam, which is a High Hazard Potential (HHP) dam , and a Condition Assessment and Inundation Modeling and Mapping to evaluate the performance and potential downstream impacts of Gibbs Avenue and Ketter Causeway HHP dams (Refer to site locations Figures 1 and 2, Appendix B).

Project objective Phase I:

DAM ID# FL00176 – Shadow Run Dam, Riverview, Hillsborough County, FL

Shadow Run Dam impounds Lake Grady and is located on the Bell Creek tributary to the Alafia River within Riverview, Hillsborough County, Florida. Refer to Figure 1 in Appendix B. The current work effort will be to complete an Operations Plan for the Shadow Run Dam. The plan will be a comprehensive single document which includes pertinent information on the dam, key operations procedures , general maintenance guidelines , items of special importance and key operations communications and contacts information.

The work effort will be to:

1) Complete an Operations Plan for the Shadow Run Dam, owned and operated by the

Shadow Run Dam Corporation (SRDC).

Project objective Phase II :

DAM ID# FL00157 – Gibbs Avenue Dam, Saratoga Harbor Estates, Putnam County, FL DAM ID# FL00158 – Ketter Causeway Dam, Saratoga Harbor Estates, Putnam County, FL

The Saratoga Harbor Estates dams impound the unnamed tributary to St Johns River in Saratoga, just north of Acosta Creek and Little Lake George.

The work effort will be to:

1) Conduct a visual inspection and condition assessment of each dam and provide the FDEP and the dam owners with a Certified Condition Assessment Report for each of the two dams.

2) Prepare a customized inundation model for each dam location.

Johnson, James J Typewriter Change Order 1 12/23/2022

3) Simulate no dam break conditions for each of the two dams based on the 100-year storm and PMP storm events and prepare matching inundation maps based on the results.

4) Simulate dam breaks for each of the two dams based on the Sunny Day, 100-year storm and PMP storm events, including the sequential dam break of the Gibbs Avenue (lower) dam, resulting from the break of the Ketter Causeway (upper) dam; and prepare matching inundation maps based on the results.

Tasks within the Scope of Work:

Conduct Condition Assessment and provide Condition Certification Reports for each dam. Perform Inundation modeling and mapping in accordance with the FDEP Emergency Action Plan Template for Florida Dams, dated December 2011, and the “Federal Guidelines for Inundation Mapping of Flood Risks Associated with Dam Incidents and Failures”, FEMA P-246 dated July 2013; and provide the requisite data to support future emergency planning for the Saratoga Harbor Estates dams. The Inundation modeling necessary for the assessment of downstream flooding hazards will require conducting dam break analyses (using computer modeling) and preparing inundation maps based on HEC - RAS 6.0.1.

The work will consist of the following tasks, which will be conducted in two phases:

Project Phase I – Task 1 Project Phase II – Task 2, Task 3, Task 4, Task 5, Task 6 and Task 7

Project Phase I

Task 1: Complete Operations Plan for Shadow Run Dam

Prepare a Dam Operations Plan for Shadow Run Dam, which will be comprehensive single document that includes, but may not be limited to:

1) Pertinent information on the dam, its location and access to the facilities

2) Key personnel and definition of responsibilities

3) Dam operations procedures

4) General Maintenance categories and guidelines

5) Inspection requirements, i.e., routine and emergency

6) Required instrumentation monitoring and surveillance at the dam

7) Key Operations and maintenance communications and contacts

DELIVERABLES:

1.) Electronically submit a Draft Operations Plan for Shadow Run Dam.

2.) Electronically submit the Final Operations Plan for Shadow Run Dam, incorporating responses to review comments provided by the FDEP.

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

Project Phase II

Task 2: Visual Condition Assessment and Certified Assessment Reports for Harbor Estates Dams

2.1. Conduct one site visit to the two dams to:

1) Meet with the Saratoga Harbor Estates dam owner and /or the Putnam County Public Works Department, Division of Engineering, representative during the site visit to obtain any first-hand pertinent information available to supplement the visual inspections and the condition assessments of the two dams.

2) Confirm the existing dam data collected in prior task activity and acquire any additional data necessary to assist with the dam condition assessments.

3) Conduct visual inspection of the dam and appurtenances and prepare photographic records of the visual observations at each dam.

4) Prepare Condition Assessment Reports for each dam utilizing FDEP templates and provide the required Certified Condition Assessment Report for the two dams.

DELIVERABLES:

1.) Provide e-mail notification to the FDEP at least one week prior to each scheduled site visit for visual inspection and dam condition assessments. The notification should include the date, time, meeting location, and the vendor contact name and phone numbers (office and cell). The e-mail notification should be sent to Tracy.Woods@FloridaFDEP.gov.

2.) An electronic version of documents obtained from the dams’ owner, including any data relative to original design plans, inspections, maintenance records, etc.

3.) Prepare Draft Condition Assessment Forms and Photographs for each dam utilizing FDEP templates, and electronically submit to FDEP .

4.) Prepare and electronically submit the Final Certified Condition Assessment Report for each dam, incorporating responses to FDEP comments.

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

Task 3: Field Survey & Bathymetry Data Acquisition and Historic Data Review

3.1. Complete field surveying and bathymetry data acquisition at each dam to:

1) Establish the top of dam profile, embankment dam cross sections and collect dam outlet works dimensions data necessary to support the hydraulic and dam break analyses.

2) Confirm (ground truth) site topographic mapping at each dam and downstream impact areas.

3) Conduct bathymetric survey of each dam impoundment to establish the elevation -storage – area relationships between the bottom of the lake and dam operating pool levels.

4) Conduct Bathymetric Survey of the tributary stream between Gibbs Avenue and the mouth and along St Johns River at the confluence with the tributary stream.

3.2. Review As - Built dam/roadway crossing data provided by Putnam County Department of Public Works, Division of Engineering, versus field survey data obtained in Task 2.1.

1) Review and validate As- Built data with data obtained from field survey dam elevation-storage data and collect any pertinent additional data necessary to perform the dam condition and hydrologic analyses.

2) Conduct project site area reconnaissance to review current condition of each dam and appurtenances, and downstream potential hazard locations.

DELIVERABLES:

1.) Provide e-mail notification to the FDEP at least one week prior to any scheduled site visit and / or to meet with the owners or their representatives, and to conduct the required field surveying and bathymetry work. The notification should include the date, time, meeting location, and the vendor contact name and phone numbers (office and cell).

The e-mail notification should be sent to Tracy.Woods@FloridaFDEP.gov.

2.) An electronic version of the field surveying data obtained for each dam, along with photographs taken at local survey locations.

3.) An electronic version of the bathymetry data gathered, along with corresponding shape files and pdf data files for each lake / dam site location.

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

Task 4: LiDAR Data Compilation and Bathymetry Data Merging

1) Compile the existing LiDAR and Putnam county 1ft contour derived DEM data developed for the project study area as part of prior Task Assignment 4, for the Saratoga Harbor Estates dams project area.

2) Prepare a project specific DEM mosaic buffering the project watershed area by 350 -500 feet.

3) Integrate the buffered area DEM with the Bathymetry Digital Elevation Model (BEM) hydrographic survey data developed in Task 2 above to produce a seamless merged DEM/BEM for the Gibbs Avenue and Ketter Causeway Dam sites and the downstream flooding impact area.

DELIVERABLES:

1.) Provide the project specific DEM mosaic buffering the project watershed area by 350- 500 feet.

2.) Provide the Integrated buffered DEM with the BEM hydrographic survey as a seamless merged DEM/BEM for the SHE dams.

3.) Provide the electronic LiDAR and bathymetry data and merged DEM/BEM.

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

Task 5: Conduct No Dam Break Inundation Modeling and Mapping

1) Perform hydrologic and routing analysis for each dam site location using the selected HEC-HMS computer program in conjunction with the HEC-RAS modeling program and prepare inundation maps based on the results. Each dam shall be modeled for the 100- year 24- hour storm No Dam Break condition and flood inundation maps prepared.

2) Perform hydrologic routing analysis and dam overtopping analysis for each dam for the PMP storm event, under the No Dam Break condition, and prepare inundation maps based on the results. The methodology outlined in HYDROMETEOROLOGIAL REPORT No.51, Probable Maximum Precipitation Estimates, United States East of the 105th Meridian, published by the US Dept. of Commerce, National Oceanic and Atmospheric Administration, shall be used.

3) Compare the results of the 100-year and PMP storm events No Dam Break scenarios and routing analyses for each dam.

4) Prepare and submit Draft No Dam Break Inundation Maps (IM)

5) Prepare and submit Final No Dam Break Inundation Maps (IM)

6) Prepare and submit Draft Comparative No Dam Break Analysis Mapping

7) Prepare and submit Final Comparative No Dam Break Analysis Mapping

8) Prepare downstream impacted properties map, including highlighting the maximum flooding depth above ground at the structures, for the No Dam Break scenarios. The impacted properties map shall be included in the No Dam Break inundation Modeling and Mapping Report as an Appendix.

DELIVERABLES:

1.) Electronically submit the Draft No Dam Break Inundation Modeling and Mapping (IMM)report for 100-year 24-hour storm PMP storm event scenarios both dam sites, which includes the project information, analysis assumptions, methodology, model input and output results and GIS inundation map outputs for review by FDEP staff.

2.) Electronically submit a Draft Comparative No Dam Break analysis mapping for the 100-year 24-hour storm PMP storm event scenarios considered at each dam site, as an Appendix to the report, for review by FDEP staff. The comparison shall include the flood inundation footprints, flood velocities, peak wave elevations, and peak wave arrival times at selected downstream locations.

3.) Electronically submit the Final No Dam Break Inundation Modeling and Mapping report for 100-year 24-hour storm PMP storm event scenarios both dam sites, which includes the project information, analysis assumptions, methodology, model input and output results and GIS inundation map outputs, incorporating FDEP comments.

4.) Electronically submit the Final Comparative No Dam Break analysis mapping for the 100-year 24-hour storm PMP storm event scenarios considered at each dam site, as an Appendix to the report, incorporating FDEP comments.

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

Task 6: Complete Dam Break Inundation Modeling and Mapping

1) Perform dam break and routing analysis for each dam site location using the selected computer modeling program and prepare inundation maps based on the results. The dam breaks at each dam shall be modeled for the 100- year 24- hour storm, PMP storm event and Sunny Day failures.

2) Perform dam overtopping analysis, as well as dam break and routing analysis for each dam for the PMP storm event and prepare inundation maps based on the results. The methodology outlined in HYDROMETEOROLOGIAL REPORT No.51, Probable Maximum Precipitation Estimates, United States East of the 105th Meridian, published by the US Dept. of Commerce, National Oceanic and Atmospheric Administration, shall be used.

3) Compare the results of the different dam break scenarios and routing analyses at each dam site location.

4) Prepare and submit Draft Dam Break Inundation Maps (IM)

5) Prepare and submit Draft Comparative No Dam Break versus Dam Break Analysis Mapping

6) Prepare and submit Final Dam Break Inundation Maps (IM)

7) Prepare and submit Final Comparative No Dam Break versus Dam Break Analysis Mapping

8) Prepare downstream impacted properties map, including highlighting the maximum flooding depth above ground at the structures, for the Dam Break scenarios. The impacted properties map shall be included in the Dam Break inundation Modeling and Mapping Report as an Appendix.

DELIVERABLES:

1.) Electronically submit the Draft Dam Break computer modeling Inundation Modeling and Mapping report for 100-year 24-hour storm, PMP storm event and Sunny Day failure scenarios at both dam sites, which includes the project information, analysis assumptions, methodology, model input and output results and GIS inundation map outputs for review by FDEP staff.

2.) Electronically submit the Draft Comparative Dam Break versus No Dam Break analysis mapping of the scenarios considered at each dam site, as an Appendix to the report, for review by FDEP. The comparison shall include the dam break flood inundation footprints, flood velocities, peak wave elevations, and peak wave arrival times at selected downstream point of interest locations.

3.) Electronically submit the Final Dam Break Inundation Modeling and Mapping report for 100-year 24-hour storm, PMP storm event and Sunny Day failure scenarios at both dam sites, which includes the project information, analysis assumptions, methodology, model input and output results and GIS inundation map outputs, incorporating FDEP comments.

4.) Electronically submit the Final Comparative Dam Break versus No Dam Break analysis mapping for the 100-year 24-hour storm PMP storm event and Sunny Day failure scenarios at each dam site, as an Appendix to the report, incorporating FDEP comments. Submit the electronic data for the Dam Break inundation study.

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

Task 7: Dam Failure Map for the Saratoga Harbor Estates Dams

1) A Dam Failure inundation map generated from the computer modeling analyses will be prepared for future flooding emergency planning purposes and shall conform to the applicable requirements in the FEMA Federal Guidelines for Dam Safety, Hazard Classification System for Dams (FEMA Publication 333), January 2004. The dam failure inundation map will be prepared for the worse case dam break scenarios, since the failure of Ketter Causeway Dam will likely contribute to the cascading failure of Gibbs Avenue Dam during extreme events.

DELIVERABLES:

1) Electronically submit a Draft of the Dam Failure Map for Saratoga Harbor Estates dams, for review by the FDEP.

2) Electronically submit the Final Dam Failure Map for Saratoga Harbor Estate Dams, for approval by the FDEP, incorporating the response to the FDEP review comments on the Draft Dam Failure Map. Also, provide a separate cover letter summarizing the response to comments and listing revisions to the draft Dam Failure Map.

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

Key Personnel

FDEP

Role Name Entity

Project Manager Tracy Woods FDEP Contract Manager Genita Alexander FDEP

Mott MacDonald Role Name Entity

Project Principal David Skipper Mott MacDonald Project Manager James Johnson Mott MacDonald

Principal Engineer Michael Cox Comak Group Lead Civil Engineer Brandon Bagoo Comak Group

Survey Manager Patrick McCarthy Southeastern Surveying and Mapping Corp. (SSMC)

Shadow Run Dam – Shadow Run Dam Corp(SRDC), Hillsborough County, FL

Role Name Entity Owner Contact Beatrice Adams SRDC

Gibbs Avenue and Ketter Causeway Dams – Saratoga Harbor Estates(SHE), Putnam County, FL

Role Name Entity Contact Michael Rodriguez SHE/Putnam County

Engineering Division

Project Schedule: CONSULTANT is available to begin work on this project immediately following receipt of an approved Task Order from FDEP. The Project shall be conducted in two phases:

Project Phase I – Task 1 Project Phase II – Task 2, Task 3, Task 4, Task 5,Task 6, and Task 7

Compensation and Method of Payment

Compensation to be paid to the Consultant for providing the services described herein shall be on a lump sum basis for each task Deliverable. No compensation will be paid for services and/ or tasks that are not performed. The fixed-price lump sum compensation for each 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 each deliverable. 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.

1. AUTHORIZATION

This following individual is a representative for the CONSULTANT with the authority to enter into a binding Contract with the FDEP:

Signature Date

12/23/2022

Name and Title

David Skipper, PE – Division Manager

Company Name

Mott MacDonald Florida, LLC

Appendix A

PAYMENT AND DELIVERABLES SCHEDULE

Project Phase I

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 FDEP in accordance with Contract

Terms.

Deliverable Deliverable Description Due Date Total Payment

Amount

Task 1

Complete Operations Plan for Shadow

Run Dam

1) Electronically submit Draft Operations Plan for Shadow Run Dam, Riverview, Hillsborough

County, FL (including consultation with SRDC &

FDEP)

2) Electronically submit Final Operations Plan for Shadow Run Dam, Riverview, Hillsborough

County, FL (incorporating comments from

SRDC & FDEP)

12/15/2022

12/27/2022

$19,988.80

Phase I SUBTOTAL $19,988.80

PAYMENT AND DELIVERABLES SCHEDULE (cont’d)

Project Phase II

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 FDEP in accordance with Contract

Terms.

Deliverable Deliverable Description Due Date Total Payment

Amount

Task 2

Visual Condition Assessment and Certified Assessment Report 1.) e-mail Notification to FDEP regarding visual inspection site work 2.) Electronic version of documents obtained from the

Saratoga Harbor Estates Dams Contacts.

3.) Conduct Visual Inspection of dam and submit electronic version of Draft Condition Assessment Forms and Photographs to FDEP.

4.) Prepare and electronically submit to FDEP the Final

Certified Dam Condition Assessment Reports.

01/16/2023

01/30/2023

$ 9,964.32

Task 3

Field Survey & Bathymetry Data Acquisition and

Historic Data Review

1.) e-mail Notification to FDEP regarding startup of Field Survey and Bathymetry Data Acquisition.

2.) Electronic version of field survey data gathered plus

Photos taken at local survey locations.

3.) Electronic version of Bathymetry data gathered with shape files and pdf data files for each dam and tributary stream segment.

01/16/2023

$24,278.40

Task 4

LiDAR Data Compilation and Bathymetry Data

Merging

1.)Provide the project specific DEM mosaic buffering the project watershed area by 350-500 feet.

2.)Provide the integrated buffered DEM with the BEM hydrographic survey as a seamless merged DEM/BEM for the SHE dams.

3.) Provide the electronic LiDAR and bathymetry data and merged DEM/BEM.

02/06/2023

$3,773.52

PAYMENT AND DELIVERABLES SCHEDULE (cont’d)

Deliverable Deliverable Description Due Date Total Payment

Amount

Task 5

No Dam Break Inundation Modeling and Mapping

1)Electronically submit the Draft No Dam Break

Inundation Modeling and Mapping (IMM) report for 100-yr and PMP storm events.

2)Electronically submit Draft Comparative No Dam

Break analysis mapping, as an Appendix to IMM report.

3)Electronically submit Final No Dam Break Inundation

Modeling and Mapping (IMM) report for 100-yr and

PMP storm events.

4) Electronically submit Final Comparative No Dam

Break analysis mapping, as an Appendix to IMM report.

03/31/2023

04/24/2023

$ 13,814.52

Task 6

Dam Break Inundation Modeling and Mapping

1)Electronically submit Draft Dam Break Inundation

Modeling and Mapping (IMM) report for 100-yr,PMP and Sunny Day failure events

2)Electronically Draft Comparative Dam Break versus No Dam Break analysis mapping, as

Appendix to IMM Report

3)Electronically submit Final Dam Break Inundation

Modeling and Mapping (IMM) report for 100-yr,PMP and Sunny Day failure events

4) Electronically submit Final Comparative Dam

Break versus No Dam Break analysis mapping, as an Appendix to IMM Report

05/30/2023

06/15/2023

$18,964.20

Task 7

Dam Failure Map for the Saratoga Harbor Estates

Dams

1.)Electronically submit a Draft Dam Failure Map for

Saratoga Harbor Estates dams for review by FDEP

2.)Electronically submit the Final Dam Failure Map for Saratoga Harbor Estates dams, incorporating

FDEP review comments.

07/14/2023

07/28/2023

$10,177.24

Phase II SUBTOTAL $ 80,972.20

Phase I and Phase II TOTAL $ 100,961.00

Appendix B

Figures

Figure 1. Dam ID # FL00176 - Shadow Run Dam

Shadow Run Dam

Figure 2. DAM No.1 ID # FL00157& FL00158 - Saratoga Harbor Estates Dam

Figure 3. Dam ID # FL 00157 – Gibbs Avenue Dam Watershed

Figure 4. Dam ID # FL 00158 – Ketter Causeway Dam Watershed

Appendix C

Southeastern Survey and Mapping Co Proposal for Field Surveying and Bathymetry data Acquisition is appended hereto under separate cover (See attachment).