Distribution System Evaluation Pipe Network Evaluation

The City’s distribution network condition ranges from Very Good to Poor depending on the structural integrity of the pipelines within the network, the ability of the pipelines to deliver the necessary flow meeting minimum pressure requirements, and the ability of the system to deliver water without impacting water quality (e.g., dead ends in the system which create brown water, etc). The condition of the network is a function of a variety of factors including pipe age, pipe material, soil conditions, past maintenance, initial construction, activities in the vicinity of the pipeline, the amount of growth which has occurred since the pipeline was designed and constructed, and the design of the system itself.

The City evaluates the condition of its water distribution system using a variety of techniques and information. Assessments employ field investigation, hydraulic modeling of the distribution system, leak detection and void studies and the evaluation of complaints as well as historical operating data.

Based on the projected growth for the metropolitan Atlanta region and the age of the City’s distribution system, rehabilitation and replacement of the older portions of the system is needed. Accordingly, the City has developed a program to rehabilitate older pipes where projects are sequenced to address highest priority needs and to coordinate the replacement of water and sewer pipes in areas where extensive work is occurring. For example, water lines have been replaced in selected sewer basins in conjunction with the completion of sewer separation work.

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Water System Facilities

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Adamsville Repump Station (zone transfer) 45.0 N/A Operating Steel Above Ground Tank N/A 5.0 Operating Concrete Above Ground Tank N/A 5.0 Operating Northside Repump Station (zone transfer) 40.0 N/A Operating Steel Above Ground Tank N/A 4.0 Operating Concrete Below Ground Storage

Tank N/A 6.0 Operating

Hemphill 1175 Pressure Zone

Casey's Hill ³ Complex Surge Tank N/A 0.8 Operating Dupree Booster Station (repump, zone

transfer) 9.0 N/A Standby

Steel Above Ground Tank N/A 3.0 Standby

Hartsfield Repump Station (booster) 20.0 N/A Operating

Concrete Below Ground N/A 5.0 Operating

Concrete Below Ground N/A 5.0 Operating

Peachtree-Dunwoody Booster Station (in-line, transfer) 1.7 N/A Out-of-service

Stonewall Steel Elevated Tank N/A 1.5 Operating

Welcome All Road Booster Station (in-line) 5.0 N/A Operating North Area 1225 Pressure Zone

Jett Ferry I & II Steel Elevated Tank N/A 0.5 Operating

Steel Elevated Tank N/A 0.5 Operating

Pitts Road Steel Elevated Tank N/A 1.0 Operating

Roswell Road Booster Station (in-line) 4.0 N/A Standby Sandy Springs Steel Elevated Tank N/A 0.5 Operating

Total Capacities 124.7 37.0

1 Storage tanks feed the distribution system by gravity and thus do not have rated pump capacities.

2 Similarly, pump stations do not have potable water storage capacities.

3 Casey’s Hill is a raw water tank used for surge protection. It is not included in the Potable Storage Capacity total.

The FY 2009 to 2014 Capital Improvement Program contains projects to evaluate raw water mains, valves and hydrants along with the refurbishment or replacement of distribution system pipelines, valves and hydrants. Refurbishment and replacement of water mains address reliability, pressure and capacity concerns.

Major Pump Station Evaluations

The physical conditions of the booster pump stations and tanks throughout the distribution system are Good, with the exception of the Sandy Springs Tank and the Dupree Tank, which are considered poor.

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The Northside and Adamsville Tank and Repump Stations are vital to operation of the distribution system as these stations provide a significant portion of system pumping capacity and there is no secondary source of pressure supply (pump or elevated storage) past these two pump stations. The City has completed the Northside and Adamsville Pump Station – Instrumentation & Controls (I&C) and Electrical Renovations CIP project. This project upgraded the electrical systems, instrumentation and controls, and surge control systems.

The new programmable logic controls (PLCs) have radio telemetry which relays signals back to the new load control center located at the Hemphill water pumping station. In addition, the Department has recently installed standby generators. These upgrades address the reliability issues associated with these pump stations that are identified in the 2003 Administrative Consent Order. As a result of these projects, the Northside Pump Station is in Good condition with the exception that re-roofing of the facility is required. The Adamsville Pump Station is considered to be in Good condition. The addition of a 15 mgd pump, along with the completion of new distribution mains, are required to improve service reliability to South Fulton. Improvements to the roof of the Adamsville Pump Station are also required to maintain its current condition rating.

The Hartsfield Pump Station supplies the additional pressure required to serve the Hartsfield-Jackson Airport, the South Fulton area and certain wholesale customers. This pump station is in Good condition, however, a fourth pump is to be installed to ensure reliability, in particular during peak summer months. Failure of one of the pumps at this pumping station could create pressure problems in the Hartsfield-Jackson Airport area. Ensuring adequate pressure is particularly important for providing fire protection to the airport and Clayton County.

The City is planning to acquire property, design, and construct a re-pump station to be located in the 1175 pressure zone, near the intersection of Koweta Road and Campbellton-Fairburn Road. The Koweta Road Pump Station will have a pumping capacity of approximately 22 mgd and two 5-mgd ground storage tanks. Construction of the Koweta Road Pump Station is required to increase system pressure in South Fulton and will address reliability concerns identified in the 2003 Administrative Consent Order.

Water tank painting and structural repair is required for the Jett Ferry, Casey Hill, Dupree, Sandy Springs and Pitts Road Tanks. These tanks are considered to be in Fair condition, except for the Sandy Springs and Dupree Tanks, which are considered to be in Poor condition. The Sandy Springs tank shows significant corrosion, coating failure on the interior and potential structural integrity issues. The Sandy Springs tank may require structural repairs as well as routine painting and cleaning. Tanks currently considered to be in Fair condition are in need of routine exterior painting, interior cleaning and recoating. If these projects are not completed, there is a potential for more tanks to degrade from their current condition assessment into the Poor category.

The condition of all of the other pump stations and storage tanks in the water distribution system is considered Good.

4.6 Other Regulatory Issues

As noted earlier, the City entered into two Administrative Consent Orders related to the water treatment and distribution system: the 1997 Administrative Consent Order and the 2003 Administrative Consent Order. Most of the work required to achieve compliance with the

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Administrative Consent Orders is complete. The City has six projects remaining to be completed to fulfill the Administrative Consent Order requirements including:

WBS. No. Project Title

98.03.010 Hartsville Pump Station – 4^th Pump 98.03.011 Fairburn Road Transmission Main

98.03.13 Koweta Road Pump Station & Water Main 98.08.29 Hemphill Reservoir #1 Embankment Repair 98.08.30 River Intake Erosion Control Improvements

98.04.01 Northside Pump Station to Sandy Springs Pressure Zone Interconnection These projects are included in the FY 2009-18 Capital Improvement Program. In general, the Administrative Consent Orders for the water system define performance requirements rather than specific projects that must be completed by a defined date. The City has the flexibility to determine which CIP projects are best able to maximize compliance. The City continues to monitor completion of these projects to ensure compliance with the Administrative Consent Orders.

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