Thompson Engineering

H&H CAPABILITIES, GREEN INFRASTRUCTURE & RENDERING CAPABILITIES Prepared for: Thompson Engineering

WWW.DDGPC.COM

THANK YOU FOR CONSIDERING DDG!

Included in this packet: H&H Capabilities Green Infrastructure + Low Impact Development Architecture & Landscape Architecture Rendering Capabilities

100+ EMPLOYEES

13

2,500+

39

6

STATES LICENSED

PROJECTS COMPLETED

LICENSED PROFESSIONALS

OFFICE LOCATIONS

A LEADING EDGE APPROACH Duplantis Design Group (DDG) is a comprehensive design firm and is exceptionally experienced in managing all aspects of a development project. In the 22 years since our founding, our unwavering commitment to client service excellence has allowed us to grow into a multidisciplinary regional firm with over 100 full-time employees and 6 offices across South Louisiana and Texas – Thibodaux (headquarters), Covington, Baton Rouge, New Orleans, Lafayette, and Houston.

In addition to our design services, we also provide clients with conceptual site planning and master planning, site investigation reports, assisting with property acquisitions, representation at public hearings, permitting, entitlements, and construction administration.

DDG has over two decades of experience managing every aspect of a project. From the initial site assessment and due diligence through the project’s substantial completion, DDG’s team of design professionals pride themselves not only on the technical aspects of a project, but also on our ability to focus on exceeding a clients’ expectations and providing top rated client satisfaction.

DDG is proud to help build the communities we call home. We understand the importance of complying with state, local, and federal rules and regulations throughout the life cycle of infrastructure projects. At DDG we know the political environment and funding sources so you can trust us to be your partner to get the job done right.

SERVING CLIENTS ACROSS THE GULF SOUTH

CIVIL ENGINEERING

COASTAL + H&H ENGINEERING

ARCHITECTURE

LANDSCAPE ARCHITECTURE

SURVEYING

WATER RESOURCES

H&H CAPABILITIES Duplantis Design Group, PC’s (DDG) expertise in hydrology and hydraulics engineering was developed through our years of experience with site development activities across the State, together with our support of local municipalities with flood risk assessments and regional drainage improvement projects. From the retrofit of local drainage infrastructure to the design of regional detention facilities, to conveyance improvements in major waterways, to complete drainage designs for thousands of acres of development, we have done it all.

INTEGRATED APPLICATIONS AND MODELING LOW LEVEL

MID LEVEL

HIGH LEVEL

Low Complexity Local / Site Scale

Moderate Complexity Regional Scale Event Modeling

High Complexity Fine Detail Complex Boundaries Continuous Simulations

• Forensic analysis of drainage problems / drainage master planning (new or retrofit), drainage improvement design

• Modeling of multi-dimension complex hydrodynamics

• Site hydrology – rainfall-runoff • Detention / storage analysis • Conveyance design (pipes and open channels) • Floodplain storage analysis

• Data analysis and processing (statistical analyses, regressions, trend analysis, etc.)

• Drainage analysis contained within site boundaries

• Site run-on and/or complex tailwater conditions

•Spatial analysis of inundation extents and project benefits • Rapidly varied flow conditions (hydraulic drop, jumps, and energy dissipation)

• Site hydrology due diligence

• Numerous hydraulic elements (storage, pipes, channels, pumps, structures, etc.)

•Floodplain management (NFIP) – “No Rise Analysis” and LOMRs

•Operational modeling / forecasting

WATERSHED MODELING

DATA MANAGMENT

1D/2D HEC-HMS/ HEC-RAS, SWMM RIVERINE, WATERSHED, FLOODPLAIN, ETC.

H&H DATA CATALOGS, GIS LAYERS, HISTORIC FLOODING, ETC REPORTING STANDARDIZATION

MAPPING

GIS STANDARDS PRE- & POSTPROCESSING

FLOOD RISK MANAGEMENT

STRUCTURES INVENTORIES BCA + FEMA PROCESSES, FUNDING SOURCES

DDG’S COMPREHENSIVE LIST OF FEDERALLY FUNDED PROJECTS 2019 – Lafayette Consolidated Government - Derby Heights Drainage (CDBG) 2016 – St. Tammany Parish Government, W-14 Widening and Fritchie Marsh Creation (HMGP) 2014 – City of Broussard; Street Construction (CDBG) 2014 – City of Broussard; Water & Sewer Lift Station Service for IPT Global (CDBG) 2013 – Terrebonne Parish Consolidated Government, Department of Public Works Administration Building (CDBG) 2013 – St. Charles Parish Government, Emergency Operations Center (CDBG) 2013 – Lafourche Parish Government, Elevation Program Project (HMGP) 2013 – Assumption Parish Police Jury, Administrative Building (CDBG) 2012 – Terrebonne Parish Consolidated Government, Juvenile Justice Complex (CDBG) 2012 – Assumption Parish Police Jury, Community Center (CDBG/DRU) 2012 – Assumption Parish Police Jury, Bayou L’Ourse Community Center (CDBG/DRU) 2011 – City of Slidell, Rufus Viner Community Center (CDBG) 2011 – Lafourche Parish School Board, Thibodaux Elementary School Classroom Addition (CDBG) 2011 – St. Tammany Parish Government, Drainage Improvements (LRA/CDBG) 2011 – Lafourche Parish Government, Timberland Pump Station Phase I (HMGP) 2011 – Lafourche Parish Government, Pointe-aux-Chenes Pump Station Improvements Phase I (HMGP) 2010 – St. Tammany Parish Government, Lower 15 Drainage Improvements (CDBG) 2010 – Plaquemines Parish Government, East Bank Sewer Improvements (CDBG) 2010 – Morgan City Housing Authority, Brownell Renovations Phases I, II, & III (ARRA/HUD) 2010 – St. Charles Parish Housing Authority, Renovations (HUD) 2010 – Lafourche Parish Government, Jesse Dufrene Pump Station/Gheens Area Drainage Improvements (HMGP) 2009 – City of Slidell, Drainage Projects (CDBG) 2009 – Lafourche Parish Government, Various Turn Lane Improvements (ARRA) 2009 – Terrebonne Economic Development Authority, Bayou Region Cold Storage Facility (OCD) 2009 – St. Tammany Parish Government, Program Management Services Drainage Project (LRA/CDBG) 2009 – City of Thibodaux, Beautification Projects (ARRA) 2009 – Lafourche Parish Housing Authority, Independent Cost Verification at Multiple Sites (HUD) 2009 – Lafourche Parish Government, Sewer Rehabilitation to Marydale/Lewistown/Rita Communities (HMGP) 2009 – Diocese of Houma-Thibodaux, Emergency Repairs to High Schools (FEMA) 2009 – Terrebonne Parish Consolidated Government, Government Tower Re-Roofing (FEMA) 2009 – Lafourche Parish Government, Alidore Water System Waterline Improvements (CDBG) 2008 – Lafourche Parish Government, Parishwide Pump Station Mitigation (HMGP) 2008 – Lafourche Parish Government, Parish Facility Hurricane Damage Assessment (HMGP) 2008 – Lafourche Parish School Board, Hurricane Repairs to 13 Schools (HMGP) 2002 - 2008 – Houma-Terrebonne Housing Authority, 100% Physical Needs Assessment at Bayou Towers and Senator Circle (HUD) 2008 - 2013 - St. Martin Parish Government; Street Improvements (CDBG)* 2007 – Terrebonne Parish Consolidated Government, Transit Office and Bus Maintenance Facility (FTA) 2005 – Diocese of Houma-Thibodaux, Emergency Repairs (FEMA) 2005 – Houma-Terrebonne Housing Authority, Hurricane Damage Assessments and Independent Cost Verification at Bayou Towers and Senator Circle (HUD) 2004 – Lafourche Parish Government, Drainage Improvement Project (CDBG) 2002 – City of Thibodaux, Road Rehabilitation (CDBG) 2000 – City of Thibodaux, Drainage Rehabilitation (CDBG) 1999 – City of Thibodaux, Rehabilitation of Water and Gas Distribution Systems (CDBG)

ST. TAMMANY PARISH DRAINAGE PROGRAM MANAGEMENT

ST. TAMMANY PARISH, LA

PROJECT HIGHLIGHTS • Drainage program management • Large-scale, regional drainage improvements • H&H modeling support • FEMA mapping Following the receipt of CDBG-OCD Hurricanes Katrina and Rita related funds in 2009, St. Tammany Parish selected DDG to design and oversee an effective drainage improvement program. The resulting program led to the design and implementation of 10 large-scale regional drainage improvement projects. DDG was responsible for the following: 1) coordinating and assisting with land acquisition by setting up and preparing exhibits necessary for the legal department to procure the land in order to implement the drainage projects; 2) organizing/managing and assisting the wetlands consultant in the preparation of exhibits and drawings necessary to obtain approvals and permits to begin the projects; 3) assisting with the site selection of the projects coordination and management of consultants; 4) preparation of overall project schedules and budgets; 5) review of hydrologic studies and proposed designs; 6) support during bidding and project construction activities. To date, DDG has successfully overseen the completion of eight (8) projects with a total construction cost of nearly $40 million.

Since the initial receipt of CDBG-OCD funds, DDG has continued to provide on-call assistance for St. Tammany Parish’s drainage improvement program and coastal management program. Activities supported by DDG include capital planning, project development, funding support, grant application support, benefit cost analysis, and H&H modeling support to augment the Parish’s in-house staff. As a subconsultant to DDG, CE Hydro conducted DFIRM coordination with FEMA including review of surge models, LAMP for non-accredited levees, review and analysis of WHAFIS modeling results, and general FEMA coordination.

www.ddgpc.com

LOCATION: St. Tammany Parish, LA CLIENT/OWNER: St. Tammany Parish Government Kelly Rabalais; CAO (Gina Campo - Former CAO) 21490 Koop Drive Mandeville, LA 70471 985.898.2700 krabalais@stpgov.com SERVICES PROVIDED: Civil Engineering DATES OF SERVICES PROVIDED: 06/09 - On Going CONSTRUCTION COST: $ 40.3M

ST. TAMMANY PARISH WATERSHED MANAGEMENT STUDY

ST. TAMMANY PARISH, LA

PROJECT HIGHLIGHTS • Flood risk Assessment • Analysis of RL / SRL Structures • Project Development

LOCATION: St. Tammany Parish, LA

CLIENT/OWNER: St. Tammany Parish Government Rapid growth in St. Tammany Parish in the past 20 years has led to a Kelly Rabalais; CAO number of challenges related to public infrastructure including water, (Gina Campo - Former CAO) sewer, and drainage. Rapid urban sprawl during this time period coupled 21490 Koop Drive with decentralized and private sewer collection and treatment facilities Mandeville, LA 70471 contributed to a significant decline in surface water quality. As water quality in the Parish declined, flood risk increased as areas were developed 985.898.2700 without adequate stormwater controls (i.e., detention) or best practices for krabalais@stpgov.com

floodplain management. Lack of detention and loss of floodplain storage caused the capacity of existing infrastructure to be exceeded and flooding increased.

In 2014, DDG led a flood risk assessment of St. Tammany Parish waterways as part of a comprehensive watershed management study.

DDG completed an analysis of repetitive loss / severe repetitive loss data from FEMA as part of identifying and prioritizing needed drainage improvements in the area. Thirteen different project concepts were developed that totaled more than 5,000 acre-feet of storage. For each project, conceptual designs and cost estimates were prepared along with estimates of flood risk reduction.

In addition, estimates of water quality benefits associated with these features were provided. Several of these projects are currently in the design phase and moving toward implementation.

As part of this project, DDG reviewed St. Tammany Parish’s drainage ordinance and made recommendations related to design criteria for new detention ponds. DDG also developed funding concepts for regional detention ponds that would include special taxing districts to curtail the effects of development.

SERVICES PROVIDED: Civil Engineering DATES OF SERVICES PROVIDED: 7/13 - 10/14

ST. TAMMANY PARISH FLOOD RISK AWARENESS STUDY

ST. TAMMANY PARISH, LA

PROJECT HIGHLIGHTS • HEC-HMS and HEC-RAS (2D) modeling • Flood Risk Analysis • Existing Model Inventory •Inundation Mapping Tool Following the extreme flooding that occurred in March and August of 2016, St. Tammany Parish identified the need for better flood risk products to support planning of regional drainage improvement projects and to improve emergency response during extreme weather events. Since January of 2017, Duplantis Design Group with support from CE Hydro, has provided planning and modeling services to St. Tammany Parish to improve flood risk awareness and reduce flood risk in the Tchefuncte River Basin. Through a comprehensive inventory of existing H&H models in St. Tammany Parish, DDG identified an existing regional 2D HEC-RAS 5 model originally developed by USACE to evaluate impacts following the 2016 storms. The model was significantly improved by integrating channel geometry from previous basin-wide studies including the most recent models completed in support of FEMA’s Flood Insurance Study for St. Tammany Parish. The model was calibrated for multiple events.

The new 2D model was used as the basis of a Dynamic Flood Inundation Mapping (DFIM) tool developed by CE Hydro. The DFIM tool, prepared specifically for St. Tammany Parish, produces forecasted inundation extents in real time based on observed and forecasted precipitation and tidal boundary conditions. The main component of the tool is a Python program, a widely used general programming language. In the future, St. Tammany Parish emergency managers will be able to use this application to increase response times, identify evacuation routes, inform road closures, and many other benefits.

In addition to the DFIM tool, DDG and CE Hydro are using the 2D model to identify and evaluate locations for regional detention to reduce the risk of flooding in the Tchefuncte River Basin. The results of the modeling analysis will be used in the future to support a FEMA grant application and serve as the basis of project design.

www.ddgpc.com

LOCATION: St. Tammany Parish, LA CLIENT/OWNER: St. Tammany Parish Government Kelly Rabalais; CAO (Gina Campo - Former CAO) 21490 Koop Drive Mandeville, LA 70471 985.898.2700 krabalais@stpgov.com SERVICES PROVIDED: Civil Engineering DATES OF SERVICES PROVIDED: 1/17 - 1/18

W-14 DRAINAGE IMPROVEMENTS & FRITCHIE MARSH HYDRAULIC RESTORATION

SLIDELL, LA

Project Highlights: • HEC-HMS and HEC-RAS (unsteady) model development • MIKE FLOOD model development • Flood damage assessment and benefit cost analyses • Alternatives analysis

LOCATION: St. Tammany Parish, LA CLIENT/OWNER: St. Tammany Parish Government Kelly Rabalais; CAO (Gina Campo - Former CAO) 21490 Koop Drive Mandeville, LA 70471 985.898.2700 krabalais@stpgov.com

Due to increases in land development, insufficient stormwater conveyance systems, and worsening tail water conditions due to sea level rise, there are significant drainage problems in the W-14 Basin resulting in significant street and structure flooding during severe rain events. DDG worked with St. Tammany Parish Government to obtain HMGP grant funding to reduce the risk of flooding for people residing in the W-14 basin while simultaneously reducing the marsh loss rates SERVICES PROVIDED: in the Fritchie Marsh.

Civil Engineering

The DDG team utilized an unsteady state HEC-RAS model of the W-14 Basin to evaluate the extent of existing flooding and to conduct an analysis of project alternatives. Flood reduction will be accomplished by widening approximately 3,250 feet of the W-14 Canal and constructing a regional detention pond to mitigate increases in downstream discharge resulting from improved conveyance. Based on the numerical model results, DDG performed a Benefit Cost Analysis (BCA) for the W-14 Basin to secure funding of the identified drainage improvements.

In addition to the HEC-RAS modeling, a 2D water surface model (MIKE FLOOD) of the Fritchie Marsh was developed in coordination with the Water Institute of the Gulf. Wetlands will be enhanced in the future by improving conveyance of freshwater and nutrients from the W-14 Basin to the Fritchie Marsh. DDG continues to coordinate with state and federal agencies through the CWPPRA program to improve the circulations patterns and therefore the health of the Fritchie Marsh.

CONSTRUCTION COST: $3,425,000 DATE OF COMPLETION: 2016 - Ongoing

LOWER W-15 BASIN DRAINAGE IMPROVEMENTS

ST. TAMMANY PARISH, LA

PROJECT HIGHLIGHTS • HEC-HMS and HEC-RAS (unsteady) model development • Flood damage assessment and benefit cost analyses • Alternatives analysis • Engineering and design of recommended improvements

Due to the increase in land development and inadequate stormwater conveyance, the W-15 Drainage Basin in St. Tammany Parish, Louisiana experiences significant flooding. Beginning in 2011, DDG developed a comprehensive plan for drainage improvements. The project consisted of preparing a HEC-RAS and HEC-HMS for a project area of 35-square miles that encompasses three separate but interconnected basins including W-15 Canal, W-14 Canal, and Gum Bayou Basin. Utilizing previous model data from the Southeast Louisiana Urban Flood Control Project (SELA) as well as newly acquired topographic and bathymetric data, models were developed to understand existing flooding conditions and to evaluate various alternatives for improving flood conveyance and storage. A total of 27 different alternatives were evaluated to determine the most economical solution to alleviate the existing flooding problems in different parts of the basin. A Benefit Cost Analysis (BCA) was prepared for FEMA to facilitate the award of Hazard Mitigation Grant Program (HMGP) funds.

The recommended project included the construction of a 324acre regional detention pond and cleaning and widening of approximately 3 miles of the W-15 Canal. This project accomplishes two objectives: reducing peak runoff to the W-15 Canal downstream of the Tenet Pond and increasing the conveyance capacity of the W-15 Canal. These two project elements effectively reduce the water surface elevations along the W-15 Canal thereby reducing impacts to structures throughout the W-15 Basin. DDG provided engineering services to St. Tammany Parish that included www.ddgpc.com

LOCATION: St. Tammany Parish, LA CLIENT/OWNER: St. Tammany Parish Government SERVICES PROVIDED: Civil Engineering DATES OF SERVICES PROVIDED: 11/11 - On Going

PEEBLES COULEE FLOOD STUDY & MAP ASSESSMENT

NEW IBERIA, LA

PROJECT HIGHLIGHTS • HEC-HMS and HEC-RAS model development • Pre- and post-processing of model data in GIS / CAD • Flood risk mapping • Letter of Map Amendment

LOCATION: Iberia Parish, LA

CLIENT/OWNER: Hutton Group Ben Carroll DDG was retained by Hutton to support the redevelopment of an existing 736 Cherry Street building and shopping center located at the corner of South Lewis Avenue Chattanooga, TN 37402 and E. Admiral Doyle Drive in New Iberia, Louisiana. Portions of the project 423.643.9235 site are located within a FEMA Special Flood Hazard Zone (Zone A), which bcaroll@hutton.build

are studied by approximate methods and do not include a base flood elevation (BFE), the 100-year water surface elevation. To support the SERVICES PROVIDED: redevelopment of the site, DDG prepared a flood study to establish the BFE Civil Engineering in coordination with FEMA. The following tasks were conducted to establish the BFE on a tributary to Peebles Coulee which drains into Commercial Canal and eventually in Vermilion Bay: • Data collection, analysis of existing flood studies, and coordination with the City of New Iberia, Iberia Parish, and FEMA • Survey and field reconnaissance to obtain channel topography and hydraulic structure data • HEC-HMS and HEC-RAS model development • Flood study report preparation • Submission and approval of Letter of Map Revision (LOMR) to establish flood boundaries and BFE for the previously unmapped area

DATES OF SERVICES PROVIDED: 11/17 - 01/19 PROJECT SIZE: 2,000 Acre Site

ABITA NURSERY REGIONAL DRAINAGE STUDY

ST. TAMMANY PARISH, LA

PROJECT HIGHLIGHTS • SWMM modeling of nuisance flooding • Pre- and post- model processing using GIS / CAD • Project development and alternatives evaluation • Model calibration

DDG prepared this modeling study as a sub-consultant to Trigon Associates for the purpose of evaluating existing drainage conditions and proposed drainage improvements in the Abita Nursery Subdivision in St. Tammany Parish, Louisiana. A 1D / 2D existing conditions drainage model was prepared using the software PCSWMM based on topographic data collected within the subdivision and downstream drainage laterals. The existing conditions model extends from the subdivision to the Abita River.

The model was calibrated against regional regression equations and compared with a history of drainage complaints in the subdivision and was in general agreement. The existing drainage system interior to the subdivision, consisting of a network of ditches, driveway culverts, and cross drains is in poor condition and does not have adequate capacity to move water from the subdivision to downstream drainage laterals. As a result, a good portion of the subdivision experiences nuisance flooding associated with relatively small storm events.

DDG modeled proposed improvements including replacing culverts, excavating and re-sloping channels, and increasing outfall capacity at the various points of discharge from the subdivision.

The proposed improvements provide significant decreases in peak water surface elevation. To address the increases in downstream peak discharge and water surface elevations, new detention ponds were designed to mitigate the improvements in interior drainage.

www.ddgpc.com

LOCATION: St. Tammany Parish, LA CLIENT/OWNER: St. Tammany Parish Government SERVICES PROVIDED: Civil Engineering / Water Resources DATES OF SERVICES PROVIDED: 8/17 - 8/17 PROJECT SIZE: 130 Acres 1,423 Channel Segments

DERBY HEIGHTS FLOOD STUDY & DRAINAGE IMPROVEMENTS

LAFAYETTE, LA

PROJECT HIGHLIGHTS • HEC-HMS and HEC-RAS (unsteady and 2D) model development • Calibration to August 2016 storm • Project development and alternatives evaluation • Hydrologic Survey

After the August 13, 2016 storm event, storm water overflow from Webb Coulee, a tributary to the Vermilion River, was trapped in a large portion of the Derby Heights Subdivision for weeks following the event. The subdivision retained 2 feet of standing water that was unable to drain causing significant damage and inability to access properties for an extended duration. Lafayette Consolidated Government (LCG) obtained Community Development Block Grant (CDBG) funding to implement drainage improvements to improve storm water flow within and out of Derby Heights and surrounding low to moderate-income neighborhoods.

LCG selected DDG to conduct a modeling study to identify the root cause of flooding in the area, develop an alternative to reduce both the severity and duration of the flooding compared with the August, 2016 event, and design and implement the proposed solution. Solutions under consideration entail additional culverts under Carmel Drive, improved conveyance of the D-Man Outfall, and constructing a hydrologic barrier to limit flow from Webb Coulee.

DDG developed a new HEC-HMS and 1D/2D RAS model for the D-Man Outfall. This model was combined with a previously developed RAS model for the Webb Coulee to understand the transfer of water from the Webb Coulee to the D Man Outfall during extreme events. An existing RAS model for the Vermilion River was used to determine the new model’s downstream boundary condition.

LOCATION: Lafayette, LA CLIENT/OWNER: Lafayette Consolidated Government SERVICES PROVIDED: Civil Engineering DATES OF SERVICES PROVIDED: 11/18 - Ongoing

MASTER DRAINAGE PLAN FOR MORGANFIELD SUBDIVISION

CALCASIEU PARISH, LA

PROJECT HIGHLIGHTS • HEC-HMS and HEC-RAS (unsteady) model development • Regional drainage analysis • Master drainage plan development • Coordination with local entities The MorganField Development is a large-scale mixed-used development (residential and commercial) that is expected to encompass over 2,000 acres in the East McNeese Street Basin in Calcasieu Parish, Louisiana. The development extends from just north of East McNeese Street to Louisiana Hwy 14 to the south and from Corbina Road east to Louisiana Hwy 397 (East Ward Line Road). The proposed development lies in the headwaters of the Kayouchee Coulee and Black Bayou Basins, both of which are subbasins of the larger East McNeese Street Basin. With multiple development phases, the intent of the MDP is to address how a system of integrated stormwater features (detention ponds, channels, hydraulic structures, etc.) function to prevent increases in flooding both within the boundaries of the development and in receiving waters downstream. Knowledge of the how the complete system functions will inform the phasing and construction of individual stormwater features over time.

DDG is preparing the master drainage plan based on an unsteady HECRAS model that was developed for the larger East McNeese Street Basin.

This model was updated to represent existing condition and various alternatives were evaluated to develop a drainage plan that meets both the client design criteria and local ordinance requirements. DDG worked with the Calcasieu Police Jury (CPPJ), the City of Lake Charles (City), and the Gravity Drainage District to demonstrate how a larger, regional stormwater plan and system offsets the need for smaller individual detention. Upon development, the MDP will ensure that water surface elevations at all locations with the project area are at or lower than existing conditions.

www.ddgpc.com

LOCATION: Calcasieu Parish, LA CLIENT/OWNER: Southern Lifestyle Development Jeff Foshee, PE - Director of Planning 605 Silverstone Road; Suite 107 Lafayette, LA 70508 337.221.6518 tfoshee@rrcoa.com SERVICES PROVIDED: Civil Engineering DATES OF SERVICES PROVIDED: 11/17-01/19 PROJECT SIZE: 2,000 Acre Site

FG SUNSHINE PROJECT HYDROLOGIC STUDY

ST. JAMES PARISH, LA

PROJECT HIGHLIGHTS: • Regional hydrologic study supporting large-scale industrial complex • H&H model development and application • Pre- and post-processing model data using GIS / CAD • Coordination with DOTD, OCM, and St. James Parish to demonstrate no adverse impacts

LOCATION: St. James Parish, LA

CLIENT/OWNER: Fluor Girish Joshi ADDG was engaged as a project partner in the planning, design, engineering, and 1 Fluor Daniel Drive permitting of a $9.4 billion industrial complex. Project involvement has included Sugarland, TX 77478 site evaluation, land acquisition assistance, local and state permitting support, land use approval assistance, project stakeholder coordination, community outreach SERVICES PROVIDED: involvement, drainage modeling, preparation of permitting plans for the +1,400 Civil Engineering developable acres and associated marine terminal facilities, architectural design, H&H Engineering and project due diligence coordination.

Specific H&H tasks included conducting a floodplain evaluation to support the site development and engineering activities associated with the proposed industrial complex. The project area, located approximately 3 miles southeast of the Sunshine Bridge in St. James Parish, Louisiana, is located within a FEMA Special Flood Hazard Area (SFHA) Zone AE. Development activities are thus subject o the National Flood Insurance Program (NFIP) Regulations44 CFR 59 through 44 CFR 80) and associated local floodplain management ordinances.

DDG was responsible for demonstrating that the existing floodplain and associated flood elevations would not be affected by the development of the site.

To accomplish this, DDG updated an existing HEC-HMS and HEC-RAS model previously developed for the Donaldsonville to the Gulf Feasibility Study to reflect changes in hydrology as well as site grading activities.

In addition to floodplain evaluation, DDG conducted a comprehensive study of the existing hydrologic conditions, designed facilities to mitigate the potential for increased runoff, and sized all critical drainage infrastructure including storm drains, culverts, and channels. DDG documented the results of the drainage analysis for review by DOTD to demonstrate no impacts to existing highway culverts and for Louisiana DNR Office of Coastal Management to demonstrate no hydrologic impacts to downstream waterways. A myriad of hydrologic and hydraulic models were used in the design and analysis (PCWMM, Storm and Sanitary Analysis).

DATES OF SERVICES PROVIDED: January 2019 - Completed

LAUREL RIDGE LEVEE EXTENSION STUDY

ASCENSION PARISH, LA

The Laurel Ridge Levee Extension (Project) is a 4.5 mile extension of the Laurel Ridge Levee system along the Amite River located in Ascension Parish, Louisiana. The extension is designed to increase protection against backwater flooding of the Amite River after extreme rain events and hurricane surge waters from Lake Maurepas. The project received all necessary permits to move forward with construction in 2018; however, litigation over inundation impacts has halted the project. Litigation arose from a modeling analysis by others with the implementation of multiple regional projects including the Project and little to no mitigation. The Project is now moving forward with final design under the agreement that identified mitigation efforts will be underway prior to construction. These efforts include but are not limited to LA 22 improvements which would consist of digging two channels under LA22 and other excavation in the Acy area, turning sections of LA22 into bridges.

LOCATION: Acension Parish, LA CLIENT/OWNER: GSA Consulting Engineers Glenn Shaheen 1022 S. Purpera Avenue Gonzales, LA 70737 SERVICES PROVIDED: H&H Study

GSA Consulting Engineers, Inc (GSA) requested Duplantis Design Group, PC (DOG) DATES OF SERVICES PROVIDED: in September 2019 to review two separate HEC-RAS Amite River Basin models On-Going prepared by HNTB and GEC and provide an understanding of the hydraulic models which identified the Project model runs, assumptions and limitations of each model. DOG produced a draft technical memorandum that provided a summary of the model components as well as justification of utilizing the existing models with general modifications for evaluation of the Project.

To date, DDG’s evaluation of the models has been based on visual observations and limited to the hydraulic (HEC­RAS) models only. Recommended modifications as outlined in the draft memo ranged from expanding model extents, refining overland roughness values, refining tailwater conditions, ensuring overland connectivity between reaches, and modifying the Project simulations to isolate and identify any potential impacts as a result of the Project.

The goals and objectives of the new / current modeling tasks are as follows: 1. Develop an existing conditions model utilizing existing model sets. The existing conditions model will be used to determine base water levels and inundation depths.

2. Develop four (4) proposed conditions models to evaluate the Comite Diversion only, the Project only, the Project with the Comite Diversion; and the Project with LA22 improvements. The proposed conditions model will be used to identify any potential impacts as a result of the Project and LA22 improvements.

www.ddgpc.com

GRAND CANARD MITIGATION BANK HYDROLOGIC RESTORIATION JEFFERSON DAVIS PARISH, LA

PROJECT HIGHLIGHTS • 2D PCSWMM (unsteady) model development • Real time data model calibration and validation • Hydrologic restoration The goal of Grand Canard Mitigation Bank – Phase I was the cumulative re-establishment, rehabilitation, and enhancement of 247.2 acres of swamp, bottomland hardwood, and emergent freshwater wetlands of which approximately 3.0 acres will remain as open water and nonmitigation land comprised of remnants of spoil levee and the access road.

DDG is providing design services to construct a water control system that will optimize the mitigation bank’s hydrology. Data collection activities include collection and processing of monitoring data from five (5) HOBO Water Level Loggers throughout the site and surveying topography, bathymetry, and the five (5) HOBOs. Topography and bathymetric survey was taken with refined resolution along the perimeter of Phase I to accurately replicate the geometry of the spoil levees including gaps which allow water to flood in and drain out. A 2D hydrodynamic model of the mitigation bank was developed and calibrated based on the survey data and measured water level data. The model will be utilized to simulate design alternatives of the water control struture. Once a final deisgn has been determined, DDG will optionally prepare design plans and final construction documents for the structure as well as provide construction administration.

LOCATION: Jefferson Davis Parish, LA CLIENT/OWNER: Resource Environmental Solutions Frank Cuccio 412 N 4th Street; Suite 300 Baton Rouge, LA 713.520.5400 / fcuccio@res.us SERVICES PROVIDED: Civil Engineering H&H Engineering Modeling Survey DATES OF SERVICES PROVIDED: Q3 2019

GREEN INFRASTRUCTURE + LOW IMPACT DEVELOPMENT

www.ddgpc.com

EAST LAPLACE LAND USE AND TRANSPORTATION STUDY LAPLACE, LA

Duplantis Design Group (DDG) was hired to prepare a Stage “0” Feasibility Study meeting the Louisiana DOTD and Regional Planning Commission (RPC) requirements to evaluate and recommend approaches to transform the Main Street corridor focusing on safety, ADA accessibility, and improvements to a pedestrian and bicycle network. The resulting recommendations provided for the development of an accessible pedestrian walkway and a cycle track along Main Street with “bump-outs” at intersections to reduce pedestrian crossing distances and increase bicycle safety.

LOCATION: LaPlace, LA CLIENT/OWNER: Regional Planning Commission

SERVICES PROVIDED: Landscape Architecture Civil Engineering

DDG worked closely with a steering committee comprised of residents and officials representing St. John the Baptist Parish, RPC, and DOTD. With an engaging process to develop workable solutions for the community with accepted standards such as AASHTO, NACTO, and LaDOTD, DDG was able to develop recommendations that DOTD can subsequently incorporate into its project funding process.

WA / FH S OTD LaD NDARD STA

EMERGENCY & URGENT CARE FACILITIES

MULTIPLE LOCATIONS, LA

DDG has been involved with several privatized, free-standing emergency rooms in the New Orleans area. The emergency room buildings range from approximately 7,000 to 9,000 square feet in area and are situated on approximately one acre size parcels requiring significant redevelopment in largely urban areas. DDG assisted in acquiring multiple city approvals such as design review and stormwater management plan approvals. Some of the challenges in the design, as it relates to the stormwater management plan, include capturing, treating/filtering, holding, and releasing the first 1.25 inches of rainfall. The use and implementation of “Green Infrastructure BMPs� such as pervious concrete, vegetated swales, and underground storage/treatment units were utilized in meeting stormwater management plan requirements.

These project were all compliant with the NOLA Stormwater Codes requiring BMPs/Green Infrastructure.

www.ddgpc.com

LOCATION: Multiple Locations in Jefferson Parish, LA CLIENT/OWNER: Ochsner Health Systems SERVICES PROVIDED: Architecture Landscape Architecture

I-12 ENHANCEMENTS

ST. TAMMANY PARISH, LA

The St. Tammany Parish comprehensive plan, New Directions 2025, describes an alternative smart-growth rooted in historic and traditional principles that will increase the parish’s economic potential. With a “Village-in-theWoods” vision, several gateway overlay districts were established to enhance the entryways into the Economic Development Districts (EDD) along I-12 interchanges.

DDG was engaged to develop the initial enhancement concepts and construction documents for the first two EDD gateways.

It was imperative that these initial projects be implemented in a way that demonstrated the “value” and economic benefit to the area, and the design approach required a “return on investment” for community buy-in. With an extremely limited time frame, DDG began conceptual design, obtained permits from LA DOTD, and finalized construction documents for public bidding within an extraordinary two months.

As the project awaits the parish construction bid process, DDG has offered the following economic ROI of the project: • Native plantings and meadows will reduce annual mowing expenses by 72.3% • Stormwater quality will be improved by 50% • Peak flow of stormwater during an event will be reduced by 50% • Pollinators and wildlife will be increased by 200% • Research has demonstrated that 74% of the public prefer to patronize businesses with landscape enhancements

LOCATION: St. Tammany Parish, LA CLIENT/OWNER: St. Tammany Parish Government -Kelly Rabalais 21454 Koop Drive, Suite 2F Mandeville, LA 7047 985.898.2445 SERVICES PROVIDED: Landscape Architecture Civil Engineering

TRICENTENNIAL PLACE PARKING FACILITY

NEW ORLEANS, LA

SPECIAL FEATURES •

Master planning and designing parking lot

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Met functional requirements of vehicular and pedestrian circulation while reducing stormwater runoff through bioswales and rain gardens

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Sustainable approach while preserving park’s history

LOCATION: New Orleans, LA CLIENT/OWNER: New Orleans City Park Improvement Association SERVICES PROVIDED: Civil Engineering Landscape Architecture CONSTRUCTION COST: $1.1 M SIZE OF PROJECT: 5 Acres COMPLETION DATE: 2010

www.ddgpc.com

PONCHATOULA STREET SCAPE

PONCHATOULA, LA

DDG facilitated a master plan for the City of Ponchatoula to envision a two acre downtown revitalization project.

Running down both sides of West Hickory Street and in front of city hall, DDG designed a renovated streetscape and expanded parking for the downtown area. The majority of the project will be implemented immediately in an adjacent empty lot but will continue to expand as the city makes renovations to its existing civil infrastructure and facilities. DDG worked closely with the mayor, discussing the city’s top priorities and developing a phasing system that works within their renovation schedule and budget constraints. The finished pocket park will serve those working in the downtown area and will be a welcome place of respite and relaxation. While small events could be held in the park, its main goal is to provide users with passive recreation opportunities and to serve as an announcement center for the city’s residents in regards to upcoming civic events. Other improvements along West Hickory will include updating parking and shaded seating areas separating users from the street, while creating outdoor gathering areas for local businesses.

LOCATION: Ponchatoula, LA CLIENT/OWNER: City of Ponchatoula SERVICES PROVIDED: Civil Engineering Landscape Architecture CONSTRUCTION COST: $675,185 SQUARE FOOTAGE: 2 acres DATE OF COMPLETION: Master plan completed in March 2016

ARCHITECTURE & LANDSCAPE ARCHITECTURE 3D RENDERING CAPABILITIES

INTEGRATED DESIGN DDG offers a “one stop shop” delivery with our architects, civil engineers, surveyors, and landscape architects all working collaboratively under one roof providing the highest level of quality control throughout the project lifecycle.

TECHNOLOGY DDG uses the latest 3D BIM software for rendering and video capabilities.

We have the ability to give our clients an in-depth view of their projects while still in the design phase.

SHELL WELLNESS CENTER

GEISMAR, LA

CLIENT/OWNER: Shell Oil Company SERVICES PROVIDED: Architecture Landscape Architecture Civil Engineering CONSTRUCTION COST: $7 Million SQUARE FOOTAGE: 20,000 SF Building 5 Acres Site DATE OF COMPLETION: March 2020

www.ddgpc.com

PROJECT FEATURES • Multi-Purpose Facility • Kitchen to serve 1,500 meals per day • Fitness and Wellness Center • Basketball Court • High Tech Equipped Conference Room • Outdoor Water Feature • Access from outside or inside the fence Completed in just over 14 months, the Shell Geismar Wellness Center project included a renovation to an existing preengineered metal building, with added structural steel and a new metal building.

Building out with light gauge and cold metal framing for walls, new finish gyp board and tile, as well as acoustical ceilings, and resilient athletic flooring. The building’s features exterior wall panels with aluminum entrances and storefronts and a seamed metal roof. Packaged air units provide AC with existing and new panels providing power. The facility has dry and wet pipe sprinkler systems and a fire alarm. Site work included new concrete and asphalt paving, with sidewalks, landscaping, outdoor patio, and an added basketball court.

PINNICAL POLYMER ADMINISTRATION BUILDING

GARYVILLE, LA

LOCATION: Garyville, LA CLIENT/OWNER: Pinnacle Polymers SERVICES PROVIDED: Architecture Civil Engineering Landscape Architecture SQUARE FOOTAGE: 9,200 SF

DDG is providing Architecture, Civil Engineering, and Landscape Architecture design services for Pinnacle Polymer’s new 9,200 sf Administration building.

Unique project feature: The floors that will be used throughout the building were created using products from Pinnacle Polymers.

SHELL ADMINISTRATION BUILDING

GEISMAR, LA

DESIGNED TO MEET

LEED GOLD STANDARDS

LOCATION: Geismar, LA CLIENT/OWNER: Shell Oil Company SERVICES PROVIDED: Architecture Civil Engineering Surveying Landscape Architecture SQUARE FOOTAGE: 90,000 SF

www.ddgpc.com

DDG’s architecture team prepared a comprehensive building program evaluation and publication which will be used as the playbook for the design team to begin the Schematic Design (SD) phase for a new multilevel 90,000 s.f. Administrative Office Building on +/- 8-acre site. This new office building will include the office and cubical spaces, a conference center, break areas, collaborative spaces, and an Emergency Operations Center (EOC) on one of the upper levels. DDG’s civil team also provided Schematic Design (SD) services for the new building as well as associated parking field and drive extensions located just north of the Railroad tracks on Ashland Road in Geismar, LA.

EXPERIENCE

DANA INC. SERVICE & ASSEMBLY CENTER

SLIDELL, LA

LOCATION: Slidell LA CLIENT/OWNER: Dana, Inc SERVICES PROVIDED: Architecture Civil Engineering CONSTRUCTION COST: $4 M SQUARE FOOTAGE: 32,000 SF

DDG provided both Architectural and Civil design services to Stirling Properties for Dana Incorporated’s new 32,000 sqft.

Service and Assembly Center which is the first facility to be constructed in Stirling’s Fremaux Park development. The building consists of a 19,000 sqft. conditioned machine shop designed specifically for the company’s highly specialized equipment, a 9500 sqft. storage area and 2500 sqft. of office space.

HIGHWAY TRANSPORT CUSTOMER SERVICE CENTER

GEISMAR, LA

LOCATION: Geismar, LA CLIENT/OWNER: Highway Transport SERVICES PROVIDED: Architecture Civil Engineering Surveying Landscape Architecture CONSTRUCTION COST: $6.2 M SQUARE FOOTAGE: 33,000 SF

www.ddgpc.com

Highway Transport’s new Customer Serivce Center located in Geismar, LA. This 33,600 SF facility includes a 6 bay maintenance shop, a training center, multiple office spaces, and a large conference room. For this project, DDG offered a “one-stop-shop” delivery with our architects, civil engineers, landscape architects, and surveyors all working collaboratively under one roof providing the highest level of quality control through the project lifecycle.

“

On behalf of our Team at Arkel Constructors, I would like to take the time to say thank you to yourself and the entire DDG Team for working with us to build the new Terminal for Highway Transportation. When Architects, Engineers, and Contractors work together as one towards a common goal, it allows all of us to deliver a product that we and our clients can be proud of. It was truly a pleasure working with Corey, Kyle, and John on this project and look forward to many more projects with your team.

- Layne Moreau Project Manager, Arkel

WESTWEGO SPORTS COMPLEX

WESTWEGO, LA

LOCATION: Westwego LA CLIENT/OWNER: Louisiana Stadium & Exposition District (LSED) SERVICES PROVIDED: Civil Engineering Architecture Landscape Architecture CONSTRUCTION COST: $14 M

DDG - in association with The Sports Force out of Canton, GA - is working with the Louisiana Stadium and Exposition District (LSED) to develop Phase 1 of The Westwego Sports Complex in Westwego, LA. The $14,000,000 project will be a state and regional sports facility catering to local/recreational and youth sports travel teams and tournaments. It is anticipated to be an economic driver for the region. The project, at completion, is to encompass approximately 220 acres. Phase I, however, will encompass approximately 140 acres.

To be included in the total development: 12 baseball diamonds, 24 soccer fields, a cross country/perimeter trail, 2 playgrounds, locker/restroom/concession facilities, play lots/sand volleyball areas, administrative office space, and parking spaces for over 1,250 vehicles.

SQUARE FOOTAGE: 220 Acres DATE OF COMPLETION: Q4 2018

NORTH TANGIPAHOA PARISH RECREATION PARK

KENTWOOD, LA

SPECIAL FEATURES •

Visionary master plan for a $10 M, 62-acre park.

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Project utilized local, state, and federal funding.

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Phase II to include: community center, skate park, RV camping, nature center, maintenance facility, playground and spray ground, and football/soccer fields.

LOCATION: Kentwood, LA CLIENT/OWNER: Town of Kentwood SERVICES PROVIDED: Civil Engineering Landscape Architecture CONSTRUCTION COST: $10 M SQUARE FOOTAGE: 62 Acres DATE OF COMPLETION: Phase I - 2013

www.ddgpc.com

BAYOU LAFOURCHE CULTURAL TRAIL - MASTER PLAN

LAFOURCHE PARISH, LA

SPECIAL FEATURES •

Local planning insight and park design

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Contains opportunities, challenges analysis, recommendations, and preferred trail alignment and trail treatment

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Branding and wayfinding signage

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Health and economic impact report if entire 56 mile alignment is implemented

LOCATION: Lafourche Parish, LA CLIENT/OWNER: Lafourche Parish Government (DDG is sub-consultant to Alta PLANNING+DESIGN) SERVICES PROVIDED: Landscape Architecture Civil Engineering CONSTRUCTION COST: $42,350 for Master Plan Contact Info: Lafourche Parish Government Jeffery Leuenberger 985.493.6610

NICHOLLS STATE UNIVERSITY 25 YEAR MASTER PLAN

THIBODAUX, LA

The information compiled for this master plan came from a combination of research, campus input, subcommittee meetings, and a campus wide survey. The majority of the research took place over the 2018 Fall semester. The four-month long process utilized focus groups with a variety of participants. Classified employees, unclassified employees, students, organizations, and the executive administration staff all came together in an informal setting to have open discussions on delegated topics.

LOCATION: Thibodaux, LA

The intent of the master plan is to maximize the existing land available on campus, create flexible design opportunities that can ride the waves of economic and technological growth, and create a campus that is a destination for the surrounding communities, for both students and the public alike.

SQUARE FOOTAGE: 210 Acre Campus

www.ddgpc.com

CLIENT/OWNER: Nicholls State University Foundation SERVICES PROVIDED: Architecture Landscape Architecture

HOWELL COMMUNITY PARK

BATON ROUGE, LA

DDG was given the opportunity to create and reconfigure a centrally located 70 acre underutilized golf course in Baton Rouge into a new community public park. The Howell Community Park renovations included new spaces for recreation, creativity, contemplation, active use, and passive uses. This has allowed the public to use this space for much more uses than had originally planned.

Now featuring walking trails through tree groves, fishing ponds, lighted basketball courts, a multi-purpose field, an adventure playground, additional parking, restrooms, four picnic shelters, and spaces for community gathering at the amphitheater has allowed the public to enjoy the space as a community again.

LOCATION: Baton Rouge, LA CLIENT/OWNER: Baton Rouge Recreation & Park Commission (BREC) Richard Reed 6201 Florida Blvd Baton Rouge, LA 70806 225.273.6403 225.273.6403 DDG SERVICES PROVIDED: Civil Engineering Landscape Architecture ACTUAL BUDGET: $2.7 M SIZE: 40 Acres DATE OF COMPLETION: March 2018

LUMCON NORTH CAMPUS

HOUMA LA

DICKSON ROAD

SPECIAL FEATURES •

Modern, Nautical Themed Architecture Dormitories Warehouses High Tech Collaborative Education Center Campus Entry Administration Facility AREA PLAN

• • • B

C A

• •

HOUMA, LOUISIANA

BUILDING LEGEND E D

CAMPUS RENDERING F

A

EXISTING MARINE & PETROLEUM SAFETY TRAINING CENTER

B FUTURE ADMINISTRATION BUILDING 1 HOUMA, LOUSIANA LOCATION: C LUMCON ADMINISTRATION FACILITY

Houma, LA D

DORMITORY 1

CLIENT/OWNER: E FUTURE CLASSROOM BUILDING 1 LUMCON F

H

G

DORMITORY 2

MARINE WAREHOUSE G LUMCON SERVICES PROVIDED: Architecture H FUTURE WAREHOUSE

SQUARE FOOTAGE: 300,000 sf (Site) 169,214 sf (Buildings)

MUNSON SLIP

DATE OF COMPLETION:

TBD CAMPUS SITE PLAN

HOUMA, LOUISIANA

MASTER PLANNING www.ddgpc.com

BUILDING RENDERING LUMCON ADMINISTRATION FACILITY

WASHINTON PARISH PARK MASTER PLAN

FRANKLINTON, LA

LOCATION: Franklinton, LA CLIENT/OWNER: Washington Parish Rec. District #1 DDG SERVICES PROVIDED: Civil Engineering, Architecture Landscape Architecture PHASE 1 CONSTRUCTION COST: Master Plan identified at $8m construction budget.

SIZE: 115 Acres DATE OF COMPLETION: 2012. Project not funded yet.

Contact Info: Johnnie Daniel, Chairman 985.839.6562 jd67@bellsouth.net

Duplantis Design Group 314 East Bayou Road Thibodaux, LA 70301 985.447.0090 www.ddgpc.com