rivertown water treatment plant project

PROJECT DEFINITION

JEA Project 825-03

January 2016 Revision 1, August 22, 2018

Initially Prepared By: Robert Zammataro Revised by: Mickey Willoughby

JEA Water/Wastewater System Planning 21 West Church Street, T-4

Jacksonville, FL 32202

RiverTown Water Treatment Plant Project

Table of Contents

SECTION I - GENERAL INFORMATION Introduction Justification

SECTION II - PROJECT SPECIFICS Project Scope Location Design Criteria

Capacity and Phasing Future Expansion Water Quality

Raw Water Potable Water

Process Flow Diagram and Treatment Processes Production Wells Sulfide Treatment Water Storage Sodium Hypochlorite System High Service Pump Building Process Control System Flow Monitoring Emergency Generator Coatings and Materials of Construction

Location & Site Planning Land Ownership, Acquisition, and Easements Site Survey Site Development Constraints Facilities Layout Storm Water Management Features Access Security Electrical Power Resiliency

Regulatory Requirements

SECTION III - IMPLEMENTATION Project Schedule Project Management & Delivery

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SECTION I – General Information

Introduction

The purpose of this Project Definition is to provide the scope and schedule for the JEA RiverTown Water Treatment Plant (WTP) Project. This Project was initially started in 2006; however, the Project was put on hold in 2007 due to an economic downturn. A partially complete design package was produced when the Project was put on hold in 2007.

In 2018, it was determined necessary to re-start the Project due to improvements in the economy, significant growth in the RiverTown area, and increasing demand for potable water. In addition, it has been decided to start with a fresh design for the JEA RiverTown WTP Project due to changes in design and operational philosophy and lessons learned from recent projects.

In general, the project scope complies with the design criteria in the JEA Water Treatment Plant Standards Manual. Lessons learned from recent projects have been incorporated into this Project Definition.

Justification

Capacity – The South Grid is JEA’s fastest growing service area and continued growth/demand in this area will exceed the potable water supply in the future. Hence, the RiverTown WTP Project will be implemented within JEA’s South Grid to provide additional water treatment and distribution capacity.

SECTION II – Project Specifics

Project Scope

The scope of the RiverTown WTP Project is to provide raw water production wells, water treatment plant with a maximum daily flow (MDF) of approximately 4.7 million gallons per day (MGD) and peak hourly flow (PHF) of 7.5 MGD (Phase 1 of Project), and associated components to extract water from the Floridan aquifer, treat the raw water to meet regulatory requirements, and transfer the treated water to JEA’s potable water distribution system.

Location

The RiverTown WTP will be located at 7612 Longleaf Pine Parkway in St. Johns County, Florida as shown in Exhibit No. 1.

Design Criteria

Capacity and Phasing

The Phase 1 capacity of the RiverTown WTP is based on the results (Scenario No. 3) of an analysis in the report “US – 1 South Re-pump and Water Main, 10% Schematic Design

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Document,” dated May 8, 2017. The Phase 1 and 2 capacity are presented below. The current project will provide for Phase 1. Phase 2, if needed, will developed in the future.

Phase 1 Phase 2

MGD GPM MGD GPM

ADF: 2.7 1890 4 2800

MDF: 4.7 3290 6.5 4550

PHF: 7.5 5250 10.6 7420

Future Expansion

The WTP will be configured to allow future expansion, if needed, with additional production well(s), sulfide treatment, ground storage tank, high service pump, and sodium hypochlorite storage tank.

Water Quality

Raw Water

Groundwater from the Floridan aquifer will be the source of the raw water for the RiverTown WTP via new production wells installed by the Project. Potable Water

The RiverTown WTP will be designed to provide “potable water” to meet Florida Department of Environmental Protection (FDEP) drinking water standards.

Process Flow Diagram and Treatment Processes

The process flow for the Project is presented in Exhibit No 2. In addition, the anticipated water treatment processes, which are based on JEA standard processes, are shown in Exhibit No. 2.

Based on lessons learned from previous projects, enhanced sulfide removal has been included in the RiverTown WTP treatment processes. During the initial portion of the Project, water quality data will be obtained for the Floridan aquifer in the vicinity of the RiverTown WTP to refine the decision on enhanced sulfide removal for compliance with the 0.3 mg/l sulfide criteria in F.AC. 62-555.315.

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Exhibit 1, RiverTown WTP and Well Sites

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Production Wells:

It is anticipated that three (3) production wells (2 wells for regular use and 1 backup well) will be installed into the Upper Floridan Aquifer to provide raw water to the WTP for treatment. The approximate locations of the well sites are shown on Exhibit 1:

Well No. 1 within the WTP site.

Well No. 2 east of the WTP site and Longleaf Pine Parkway.

Well No. 3 south of the WTP site and west of Longleaf Pine Parkway.

The design for the production wells will include associated raw water pipeline and major well equipment for a typical JEA production well including, but not limited to, the following:

Well, well casing, and wellhead flange. Well head assembly including 1,500 gpm vertical turbine well pump, hollow-shaft

motor, motor lead, pump discharge piping, isolation valve, check valve, flowmeter, instrumentation, flushing tee, sample port, and air release valve.

Raw water line. Motor control center, control panel, and SCADA panel. Monitoring and control via JEA’s SCADA system. Concrete pad for the wellhead assembly, panels, and instruments. Security protection (on-site well will be enclosed by the security fence for the WTP

and the off-site wells will be enclosed with security fences equipped with lockable vehicle access gates).

Note: It is planned to issue separate construction contracts as follows:

Contract for wells, well casings, and wellhead flanges including well site preparation/development (e.g., clearing, fill, erosion control measures, and construction access roads for the wells)

Contract for well pumps, water lines, and water treatment plant.

Sulfide Treatment:

Since groundwater from the Floridan aquifer may contain elevated levels of sulfide, it has been determined prudent to include enhanced sulfide treatment (e.g., packed towers/degasifiers) in the RiverTown WTP Project in addition to JEA’s standard practice of using tray aerators and forced ventilation on the ground storage tank for removal of hydrogen sulfide from the groundwater. As previously stated, water quality data will be obtained for the Floridan aquifer in the vicinity of the RiverTown WTP site for use in refining the sulfide treatment requirements for the WTP.

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Well #2 Cap: 1,500gpm

Storage Tank Cap: 2.0 MG

High Service Pump Station

Sodium Hypochlorite System

Well # 1 Cap: 1,500 gpm

Flow Meter

Sulfide Treatment 2 Degasifiers @ 1,500 gpm each

Existing 20-inch Potable Water Transmission Line

Exhibit No. 2 – Process Flow Diagram

Well # 3 Cap: 1,500 gpm

Site Boundary for RiverTown WTP

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Water Storage A prestressed concrete water storage tank with a useable volume of two (2) million gallons (MG) will be constructed to store raw water and provide retention time after aeration. The tank will be equipped with tray aerators and powered ventilation for removal of hydrogen sulfide. The tank will be equipped with interior ladder, access stairway, handrails, interior baffle, sampling ports, level indicator, stainless steel manways for entry through the tank sidewall, and lockable hatch on the tank dome. It is anticipated that the tank will have an inside diameter of approximately 115 feet and water depth of approximately 26 feet. The site will be configured to facilitate future construction of a second storage tank if needed.

Sodium Hypochlorite System:

A sodium hypochlorite system will be installed to provide for disinfection of the water prior to introduction into the distribution system. The sodium hypochlorite system will be sized based on the maximum pumping capacity of the high service pumps, 12% sodium hypochlorite solution, and a maximum chlorine dose rate of 10 mg/l for potable water; however, it is expected that the actual chlorine dosage will be 2 mg/l or less. The sodium hypochlorite storage tank will be sized to hold a 14-day supply when approximately 85% full. Hence, one double-wall storage tank (approximately 8,000 gallon capacity) will be provided. The sodium hypochlorite system, including the tank, dosing pumps, and chlorine analyzer will be located in a concrete diked area equipped with sump and sump pump. In addition, the sodium hypochlorite system will be located in an air conditioned CMU enclosure, which may be attached to the High Service Pump Building or a standalone enclosure, to reduce the rate of deterioration of the sodium hypochlorite solution and the storage tank. The sodium hypochlorite enclosure will include provisions (e.g., piping, tank pad, overhead door(s) for access) for the future installation of a second tank of equal capacity.

The sodium hypochlorite system will include a hypochlorite dosing/metering pump skid with two (2) metering pumps (e.g., Grundfos Smart Digital XL DDA digital diaphragm pump with variable flowrate of zero to 52.8 gallons per hour): one pump for duty operation and one pump in standby. The sodium hypochlorite system will include: (1) a dosing point downstream of the water storage tanks and upstream of the high service pumps and (2) chlorine analyzer downstream of the high service pumps to provide a loop feedback time of 5 minutes or less.

Safety shower/eyewash stations will be provided adjacent to the (1) sodium hypochlorite fill station and (2) the metering/dosing pumps.

High Service Pump Building:

The RiverTown WTP will include a high service pump building with an approximate area of 4,800 square feet containing the following rooms/features:

Concrete masonry unit (CMU) exterior walls

Electrical equipment room for the electrical switch gear, motor control center, control

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cabinets, SCADA interface and monitoring equipment, variable frequency drives (VFDs) for the high service pumps, automatic transfer switch, and sufficient space for electrical components and controls for future build-out.

Office.

Unisex restroom consisting of one water closet, lavatory, floor drain and tankless water heater. The restroom will be American Disability Act (ADA) compliant and will be accessed via the interior of the building.

Air conditioning for the electrical equipment room, office, and restroom.

Floors will be concrete slab on grade with floor drains that discharge to the wastewater pump station.

High Service Pump Room with the following features/components:

o High Service Pumping System:

Four high service pumps with variable frequency drives (VFDs) to handle the Phase 1 flows (see previous table).

Operating pressure range: 60 psi to 80 psi, Shutoff head at 10% over max operating pressure Type: Horizontal, Split Case, Centrifugal Two (2) large (1,800 gpm) capacity pumps with VFD drives Two (2) small (900 gpm) capacity pumps with VFD drives Configured and piped to accommodate installation of fifth pump in the future

if needed to handle the Phase 2 flows (see previous table). Pumps will be mounted on pedestals/foundations that will be sized for the

large pump size. Suction piping will be located in a pipe trench within the building floor and

covered with grating in the building. The trench grating will be designed for heavy traffic loading. A sump will be located in the trench with a sump pump that will discharge to the building drain system.

Discharge piping will be above grade within the building and exit through the wall.

o 3-ton bridge crane.

o Service truck access area, which will allow the bridge crane to load and off-load pumps, motors, valves, and other components into service vehicles.

o Manual rollup door to allow service trucks (e.g., Ford F-450/F-550 equipped with portable cranes) to enter the building for maintenance, repairs, loading and unloading.

o Exhaust louvers and powered fans to provide ventilation.

o Storage area or room (approximately 100 ft2) for storage of equipment and supplies.

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WTP Site:

o Wastewater lift station to handle sanitary wastewater and process water/drain water.

o Stormwater system that transports stormwater runoff from the building and site to an on-site storm water pond by gravity.

o Paved access roads

Process Control System:

The WTP will have local and automated supervisory control and data acquisition (SCADA) system and will communicate (either wirelessly or via fiber optic cable, if available) with the Ridenour Central Control Room. The control system shall provide for monitoring and control of all process equipment and systems including, but not limited to: well pump operation, pH of raw water, sulfide treatment system, ground storage tank water levels, ventilator operation on ground storage tank, VFD controlled high service pumps, sodium hypochlorite injection, sodium hypochlorite level in storage tank, chlorine residual, flow rates for the wells and the plant, emergency generator, pressure in the water distribution system, wastewater pump station, and sump level in the sodium hypochlorite storage area. Flow Monitoring: Flow meters will be installed to measure the flow rate and total flow at the production wells and discharge of the plant into the water distribution system. The meters shall conform to current JEA standards and be connected to the SCADA system. Emergency Generator: An emergency generator will be installed to provide backup electrical power via an automatic transfer switch for all high service pumps, the on-site well pump, sulfide treatment system, ventilators on ground storage tank, hypochlorite injection system, ventilation system, air conditioning system, site lighting, wastewater pump station, miscellaneous sump pumps, and SCADA system. An above ground fuel storage tank will be installed to provide fuel for 72 hours of generator operation in accordance with JEA requirements. Off-site wells will be equipped with electrical receptacles that will allow connection of portable emergency generators. Coatings and Materials of Construction: The Project will provide coatings for equipment, piping, ground storage tank, building floors, and materials of construction (e.g., stainless steel, cement lined ductile iron pipe, schedule 80 PVC pipe, etc.) in accordance with JEA requirements.

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Location & Site Planning

Land Ownership, Acquisition, and Easements

The land/sites needed for the Project are shown in Exhibit 1. JEA owns the land for the RiverTown WTP. A communications tower, which is enclosed by a fence, is located in the eastern portion of the site.

Additional land will be purchased for the installation of the off-site wells. Easements will be obtained for installation of utilities and construction of access roads for operation and maintenance of the wells. The sites for the off-site wells, especially the site for Well No. 3, are in low areas that will require site development, fill, and access road development. Site Survey

A boundary survey was previously performed for the WTP site. Topographic surveying will be performed for the WTP site, well sites, and easements for the detailed design. Additional boundary/property surveys will be performed for well sites and easements.

Several underground utilities (e.g., electrical, gas, potable water, re-use water, and fiber optics) are known to exist along Longleaf Pine Parkway. Appropriate underground utility location surveys and investigations will be performed to provide for coordination and interface of existing utilities and features that will be constructed by the Project.

Site Development Constraints

The WTP project site is approximately 4 acres. Wetlands exist on the southwest part of the property. In addition, conservation easements are adjacent to the well sites.

Facilities Layout

Civil/site development at the site will consist of storm water management, onsite and access roadways, site grading, fencing, and landscaping.

Storm Water Management Features:

The stormwater management system will be provided to collect and manage stormwater runoff from the site to comply with state and local requirements.

Access:

Access to the WTP and the off-site wells will be provided via Longleaf Pine Parkway. Onsite access for the WTP will consist of a paved surface with roadway geometry to allow chemical delivery vehicles (WB50) and service/repair vehicles to access the high service pump building, sodium hypochlorite tanks, emergency generator, fuel tank and well pump. Separate access will be provided to the off-site wells.

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Security:

The project will provide the security features required by JEA Security including, but not limited to: fence enclosure around the WTP site, powered vehicle gates controlled by badge reader for the WTP site, badge reader access for the building, and camera system. The offsite wells will be equipped with fence enclosures and manually operated and lockable vehicle gates.

Electrical Power:

Florida Power and Light (FPL) provides electrical power in the RiverTown area. Hence, appropriate coordination will be performed with FPL for electrical power for the WTP and off-site wells.

Resiliency:

The design for RiverTown WTP Project will provide resiliency against severe weather impacts with features such as:

Emergency generator for the WTP and on-site well

Electrical connectors for connecting portable generators at the off-site wells.

Locating the WTP above the 100 year flood elevation as required by FDEP regulations.

Enclosing critical equipment

Regulatory Requirements:

SJRWMD Well Construction Permits. SJRWMD Letter Modification of CUP An Environmental Resources Permit (ERP) for storm water management, wetland

resources, and endangered and threatened species review. ERP will be submitted to SJRWMD and/or Army Corps of Engineers (ACOE) as required.

NPDES General Permit for Construction Activities including Notice of Intent and Notice of Termination forms.

FDEP Public Drinking Water Facility Construction Permit for the WTP. SJ County Development Review process. FDEP permit for the sanitary lift station. FDEP Dewatering Permit FDOT / SJ County road access

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SECTION III – Implementation

Project Schedule

The projected schedule, including the major project activities and implementation sequence, is presented in Table No. 1. The project schedule will be routinely updated as the project implemented.

Project Management & Delivery The various stages of the project including responsibility for administration and implementation are presented in Table 2.

Table No.2 – Project Management & Delivery

Stage Administered by: Performed by: Submittal

To Capital Budget Project Definition W/WWSP W/WWSP PD 10% Schematic Design JEA WP E&C Eng. Consulting Team 30% Conceptual Design JEA WP E&C Eng. Consultant Team Checkpoint, Trend(if needed) 90% Detail Design JEA WP E&C Eng. Consultant Team 100% Final Design JEA WP E&C Eng. Consultant Team Checkpoint, Trend(if needed) Bid JEA WP E&C JEA Procurement Checkpoint, Trend(if needed) Construction JEA WP E&C Contractor Startup JEA WP E&C JEA Operations

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Table No. 1 - Implementation Schedule

FY 2018 FY 2019 FY 2020 FY 2021 FY 2022

List of Activities Total Days

Jun

-18

Jul-1

8

Au

g-18

Sep-1

8

Oct-1

8

No

v-18

Dec-1

8

Jan-1

9

Feb-1

9

Mar-1

9

Ap

r-19

May-1

9

Jun

-19

Jul-1

9

Au

g-19

Sep-1

9

Oct-1

9

No

v-19

Dec-1

9

Jan-2

0

Feb-2

0

Mar-2

0

Ap

r-20

May-2

0

Jun

-20

Jul-2

0

Au

g-20

Sep-2

0

Oct-2

0

No

v-20

Dec-2

0

Jan-2

1

Feb-2

1

Mar-2

1

Ap

r-21

May-2

1

Jun

-21

Jul-2

1

Au

g-21

Sep-2

1

Oct-2

1

Oct-2

1

No

v-21

Dec-2

1

Jan-2

2

PD Finalization 60 Prel GW Characterization 60

RFP for Engr Services 180

Design Well(s) 150

Design WTP 300

Well(s) Bid & Award 150

Well # 1 Const/Test 150



WTP Bid & Award 150 WTP Construction 480

WTP Startup 30 Substantial Complete

1

Project Close-out 120

rivertown water treatment plant project

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