ATTACHMENT D – TASK ASSIGNMENT CHANGE ORDER FORM

DEP CONTRACT NO.__BS135____

Task Assignment Number: 13_________

Date: _6-09-2022__________

Change Order No._5_______

Contractor Name:

__Mott MacDonald_____________________________________

Contractor Contract Manager: _James Johnson______________________

Phone: ____850-688-9166_____

DEP Contract Manager: __Genita Alexander_________________________

Phone: ____850-245-7530_____

Description of Change (Use Additional Sheets if necessary:

Task Description: Complete a Dam Break inundation study & provide support data for an EAP for Shadow Run Dam Corp.

• Task 4, Revise due date for Final Report to 6/21/2022

• Task 5, Revise due date for Draft Report to 7/11/2022

• Task 5, Revise due date for Final Report to 7/22/2022

• Due dates for Task 6 Reports remain unchanged.

CHANGE IN TASK AMOUNT

Item Fee Schedule Cost Reimbursement

Total

Original Task Amount: $75,975.54 $75,975.54

Task Amount Prior to this Change Order: $75,975.54 $75,975.54

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

Task Amount with all Change Orders: $75,975.54 $75,975.54

CHANGE IN TASK TIME

Original Task Completion Date: June 30, 2022

Completion Date Prior to This Change: July 29, 2022

Net Increase/Decrease in Task Period: 0 days

Completion Date with all Change Orders: July 29, 2022

6/09/2022

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

Tracy Woods Digitally signed by Tracy Woods Date: 2022.06.10 09:19:57 -04'00'

Genita Alexander Digitally signed by Genita Alexander Date: 2022.06.14 16:04:17 -04'00'

Rhonda Massey Digitally signed by Rhonda Massey Date: 2022.06.29 17:25:45 -04'00'

Inundation Modeling and Mapping for Emergency Action Plan for

Shadow Run Dam at Lake Grady, Riverview, Hillsborough County, FL

SCOPE OF SERVICES

Background and Project Description:

The State of Florida Dam Safety Program (FDSP) is administered by the Engineering, Hydrology, and Geology Program in the Division of Water Resource Management, Florida Department of Environmental Protection (FDEP). The Florida National Dam Safety Program Grant for FY2022 (FDEP DAM22) has approved the use of grant funds to conduct a Condition Assessment and inundation mapping for development of an Emergency Action Plan (EAP) for one Significant-Hazard Potential dam in Florida. This proposal is for condition assessment and inundation modeling and mapping to support the preparation of an EAP for the Shadow Run Dam at Lake Grady in Hillsborough County (Refer to the Figure 1 in Appendix B):

▪ DAM NID ID# FL00176- Shadow Run Dam, Riverview, Hillsborough County, FL

The objective is to:

▪ Complete a Condition Assessment on the Shadow Run Dam, owned and operated by the

Shadow Run Dam Corporation (SRDC).

▪ Complete a Dam Break inundation study and support data for an EAP for the Shadow Run

Dam for SRDC.

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 conduct a Condition Assessment and Inundation Modeling and Inundation Mapping for the No Dam Break and Dam Break scenarios at the Shadow Run Dam. For this project, the consultant shall analyze two scenarios of failure at the dam (e.g. piping at the dam outlet and overtopping at the spillway top of dam location), under Sunny Day conditions and during the 100 -year (yr) and Probable Maximum Precipitation (PMP) storm events. Note the latest available LIDAR information (2007 or later) shall be used in conjunction with the Hillsborough County GIS Platform data , with all data reported in NAVD88 datum.

The purpose of this project is to:

1) Provide a current assessment of the dam condition through a dam visual inspection.

2) Provide FDEP and the Dam Owner, with the required dam break Inundation Mapping to support the comprehensive Emergency Action Plan (EAP) for an identified flooding impact area which may confirm a Significant Hazard Potential risk or require rerating the dam as a High Hazard Potential (HHP) risk.

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

Owner Text Box

CHANGE ORDER NO.5

4) Simulate Dam break dam break condition for the dam based on the Sunny Day condition, and during 100-year storm and PMP storm events and prepare matching inundation maps based on the results.

5) 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.

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

7) Dam Break Inundation Mapping for the 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 a Condition Assessment and 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 the EAP for Shadow Run Dam owned by SRDC. 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 5.0.7, as updated. The work will consist of the following tasks:

Task 1: Field Survey & Hydrographic - Bathymetry Data Acquisition and Data Review

Conduct field surveying and hydrographic - bathymetry data acquisition at the dam to:

1) Establish the top of dam profile, embankment dam cross sections and collect dam outlet works dimensions data necessary to support hydrologic, hydraulic, no dam break and dam break analyses.

2) Confirm (ground truth) site topographic mapping at the dam and downstream impact areas (e.g., Boyette Road and Bell Creek Mouth).

3) Conduct hydrographic -bathymetric survey of the dam impoundment to establish the elevation -storage - area relationships between the bottom of the lake, dam operating pool level and top of dam.

DELIVERABLES:

1.) Provide e-mail notification to the FDSP at least one week prior to any scheduled site visit and / or to meet with the owner or their representative, and to conduct the required field surveying and hydrographic-bathymetry survey 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 and Aaron.J.Ray@Floridadep.gov.

2.) Provide an electronic version of the original field surveying data obtained for the dam and survey report, along with photographs taken at the selected field survey locations.

3.) Provide an electronic version of the hydrographic -bathymetry data gathered, as a Bathymetry Digital Elevation Model (BEM) along with corresponding Geographic Information System (GIS) shape files for the Lake Grady / Shadow Run dam impoundment area.

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

Task 2: Visual Condition Assessment and Certified Assessment Report

Conduct a site visit for visual condition assessment:

1) Meet with the dam owner, SRDC, or their representative during the site visit to obtain any first-hand supplemental information available to add to visual inspections and the condition assessment.

a) Collect and review pertinent Shadow Run dam data and acquire any additional data on site required to assist with the dam’s condition assessment.

b) Confirm the SRDC dam’s data collected in prior task activity and acquire any additional data necessary to assist with the dam’s condition assessment.

2) Conduct visual inspection of the dam and appurtenances and prepare a photographic record of the visual observation at the dam.

3) Prepare the Condition Assessment Report for the dam utilizing FDEP template and form and provide the required Certified Condition Assessment Report for the dam.

DELIVERABLES:

1.) Provide e-mail notification to the FDSP at least one week prior to the scheduled site visit for visual inspection and dam condition assessment. 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 and Aaron.J.Ray@FloridaDEP.gov.

2.) An electronic version of pertinent documents obtained from SRDC, including any data relative to recorded design plans, inspections, maintenance records, etc.

3.) An electronic version of the photographs and field inspection notes provided on FDEP Template for the dam site location.

4.) An electronic version of the Certified Dam Condition Assessment Report.

mailto:Tracy.Woods@FloridaFDEP.gov mailto:Tracy.Woods@FloridaFDEP.gov

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

Task 3: LiDAR Data Compilation and Analysis and Bathymetry data merging

Conduct LiDAR Data collection and Analysis for the Shadow Run Dam / Lake Grady project study area:

1.) Collect and review of available 2007 (as updated) LiDAR and GIS data set for the Shadow Run area from the USGS, University of South Florida City of Tampa and other data source agencies confirm if any data gaps coverage areas are needed.

2.) Download the available 2007LiDAR data and pertinent data sets and produce a DEM for the Shadow Run project study area using GIS methods.

3.) Integrate 2007 LiDAR bare earth Digital Elevation Model(DEM) with the Bathymetry Digital Elevation Model (BEM) hydrographic survey data developed in Task 1 to produce a seamless merged DEM/BEM for the Lake Grady / Shadow Run Dam site and its downstream flooding impact area.

DELIVERABLE:

1.) Compile DEM from 2007 LiDAR and Hydrographic BEM data developed in Task 1 for the

Shadow Run Dam project study area.

2.) Provide a merged DEM/BEM product in electronic format for the Lake Grady/ Shadow

Run Dam project study area with GIS shape files. This DEM/BEM product will serve as the pre-requisite for the hydrologic and 2D Hydraulic Inundation Modeling and Mapping work activity.

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

Task 4: Conduct No Dam Break Condition Inundation Modeling and Mapping

Produce a hydrologic and hydraulic routing analysis report for Shadow Run Dam for the No Dam Break condition to include:

1) 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 watershed consists of only the Bell Creek tributary contributing drainage area and will not include the larger Alafia River watershed area (Refer to Figure 2 in Appendix B).

2) Conduct routing analysis and dam overtopping analysis for the dam 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.

3) 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.

DELIVERABLES:

1.) Electronically submit Flood Inundation Maps for the dam site and downstream locations showing maximum flood elevations and maximum flood depths 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.) Once approval of the Draft Report for the No Dam Break Inundation Model analysis and Mapping is received, submit final electronic versions of all associated modeling data and reports, incorporating the response to FDSP review comments.

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

Task 5: Complete Dam Break Inundation Modeling

1). Perform Breach Analysis - Sunny Day Modeling for Shadow Run Dam (piping) 2). Perform Breach Analysis - 100yr Modeling for Shadow Run Dam only ( piping/ overtopping) 3). Perform Breach Analysis - PMP Modeling for Shadow Run Dam (overtopping) 4). Perform comparative Breach Scenarios Analyses and prepare Modeling results Tables and

Figures 5). Prepare Draft Inundation Modeling Report 6). Prepare Final Inundation Modeling Report

DELIVERABLES:

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 Shadow Run dam, that includes the project information, analysis assumptions, methodology, input and output data for breach scenarios, Tables and Figures for review by FDEP staff.

2.) Once 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 Shadow Run dam and all associated modeling data. 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.

Task 6: Complete Dam Break Inundation Mapping including EAP Dam Failure Maps

1). Prepare Inundation Mapping - Sunny Day Breach for Shadow Run Dam 2). Prepare Inundation Mapping - 100-year Breach for Shadow Run Dam 3). Prepare Inundation Mapping - PMP Breach for Shadow Run Dam 4). Prepare Comparative Breach Inundation Mapping - Sunny Day and 100-year for Shadow Run

Dam 5). Prepare Comparative Breach Inundation Mapping - Sunny Day and 100-year for Shadow Run

Dam 6). Prepare Comparative Breach Inundation Mapping - 100 year and PMP for Shadow Run Dam only 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

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

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

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 Shadow Run dam, that 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 Shadow Run dam. 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.

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 Engineer Brandon Bagoo Comak Group

Field Survey Manager Thomas K. Mead Southeastern Surveying and Mapping Corp. (SSMC)

Shadow Run Dam at Lake Grady, Riverview, Hillsborough County, FL – Shadow Run Dam Corp (SRDC)

Role Name Entity

Owner Contact Beatrice Adams SRDC

Project Schedule: CONSULTANT is available to begin work on this project immediately following receipt of an approved Task Order 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 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 fol lowing individual is a representative for the CONSULTANT with the authority to enter into a binding Contract with the FDEP:

Signature / Date

12-10-2021

Name and Title

David Skipper, PE - Senior Vice President

Company Name

Mott MacDonald Florida, LLC

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 – Shadow Run Dam Due Date

Total

Payment

Amount

Task 1.

Field Survey & Hydrographic – Bathymetry Data Acquisition & Review 1.) e-mail Notification to FDEP regarding surveying work site visit 2.) Electronic version of field survey data 3.) Electronic version of Bathymetry data as BEM with shape files

02/28/2022 $ 15,941.00

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 SRDC

3.) Electronic version of Draft Condition Assessment Form and Photographs

4.) Electronic Version of Final Certified Dam Condition Assessment Report

02/10/2022

02/25/2022 $ 9,510.44

Task 3

LiDAR Data Compilation & Analysis and Bathymetry Data Merging 1.) Compile DEM/BEM data developed in Task1 for Shadow Run Dam

Project study area with shape files 2.) Prepare merged seamless DEM/BEM for Shadow Run Dam

Project study area with shape files 03/22/2022 $ 6,576.72

Task 4 Conduct No Dam Break Condition Inundation Modeling & Mapping

1.) Prepare figures, Tables and Maps of results for 100 yr, ½ PMP and PMP storm events 2.) Electronically submit Draft Report for No Dam Break Modeling & Mapping

3.) Electronically submit Final Report for No Dam Break Modeling & Mapping

05/27/2022

06/10/2022 $ 13,814.52

Task 5 Complete Dam Break Inundation Modeling 1.) Electronically submit Draft Dam Break Inundation Modeling Report 2.) Electronically submit Final Dam Break Inundation Modeling Report

07/05/2022

07/19/2022 $ 13,442.80

Task 6

Complete Dam Break Inundation Mapping Including EAP Dam Failure Maps 1.) Electronically submit Draft Dam Break Inundation Mapping Report w/ EAP Dam failure Map 2.) Electronically submit Final Dam Break Inundation Mapping Report w/ EAP Dam Failure map

07/22/2022

07/29/2022 $ 16,690.06

TOTAL $75,975.54

Owner Line

Owner Line

Owner Text Box 06/21/2022

Owner Text Box 07/11/2022

Owner Cross-Out

Owner Text Box 07/22/2022

Owner Line

Appendix B

Figures

Figure 1. Shadow Run Dam Location

Figure 2. Shadow Run Dam # FL00176 - Bell Creek Drainage Area Map