Cobb County Water System – Pinetree-KSU Outfall Sewer Upgrade

The Cobb County Water System has selected ESI to provide the design and engineering of approximately 6,000 feet of a sanitary outfall sewer. This outfall sewer will replace an existing line that is aged and undersized. Included in the scope of services is field survey and data collection, route selection, preparation of preliminary and detailed designs, easement plat preparations, investigation of wetlands and environmental and cultural resources, preparation of permit applications, preparation of bid documents, and bid assistance. Work on this project is expected to begin in 2016.

Water Loss Control

With respect to water loss control and improving water supply efficiency, ESI, in association with Smart Water Analytics (SWA) has just been selected by GEFA to develop pilot pressure management evaluations and District Metering Areas (DMAs) for four water systems in Georgia. SWA is the lead firm of the GEFA project team which also includes international expert Julian Thornton, who was the Chairman of the sub-committee involved in preparation of the AWWA M36 Manual for Water Audits and Loss Control Programs. This experience will be helpful in assisting our clients to comply with the rules for public water systems to improve water supply efficiency.

Bahamas Water and Sewerage Corporation

ESI, in association with Smart Water Analytics (SWA), developed hydraulic models in WaterCAD® for 14 different water supply projects. The models were set up for 2035 water demands and prepared to run on Extended Period Simulations (EPS) for a minimum of 48 hours. The models were used to set the baseline conditions for new projects in the planning stage. The modelling runs included:

Energy Efficiency Assessment ‐ Using the hydraulic model, evaluated existing pumping alternatives to select the most efficient pumping system available to obtain the best‐fit balance of optimum hydraulic and energy efficiency.

Evaluation of Disinfection Systems – Analyzed disinfection efficiency by simulating water age and residual chlorine concentration for each project.

Analysis of Reliability and Redundancy of the Water Distribution System ‐ Used the hydraulic and water quality model to evaluate several scenarios regarding the vulnerability of the water system to:

• Extreme peak demands for the service areas

• Breakage of critical water mains

• Loss of power supply for pumps included in the project

• Mechanical pump failures at pumping stations

• Failure of disinfection system at the treatment plants

• Providing water storage and fuel storage for backup power for emergency situations

• Placing the facilities at locations to reduce potential climate change impacts

Demand Services

In addition to project specific contracts with various municipalities, ESI has also been selected to provide on-call engineering services by Cobb County-Marietta Water Authority, Rockdale County Water Resources, the Jackson County Water and Sewerage Authority, and Cherokee County Water and Sewerage Authority.

West Side Loop 48-Inch Water Main Replacement

The Cobb County-Marietta Water Authority has selected ESI to provide preliminary engineering, design, construction administration and construction observation services for replacement of 23,000 linear feet of 48-inch water main in west Cobb County, Georgia. This interesting project includes installation of the water main along busy roads with significant commercial presence.

City of Griffin, GA – Still Branch WTP Conversion to DAF

Raw water for the 8-MGD Still Branch Water Treatment Plant comes from a pumped storage reservoir that has a very small drainage basin. This combination results in raw water with a very low turbidity of less than 1 NTU, which makes conventional treatment challenging due to the difficulty of making a settleable floc that also provides for long filter runs. The floc that is formed in flocculation and sedimentation tends to shear easily and results in short filter runs of the downstream multi-media filters.
ESI worked with the City of Griffin to evaluate the plant in preparation for an expansion needed to meet future demands. The recommendation that resulted from the evaluation was to convert the sedimentation step prior to filtration to Dissolved Air Flotation (DAF). The DAF process requires the formation of only a small pin floc that will float instead of the denser floc required in sedimentation. The conversion to DAF designed by ESI will result in significant savings to the City of Griffin immediately after construction is completed in 2014 and in all future expansions to the facility, which was designed originally to be expanded from the initial capacity of 8 MGD to an ultimate capacity of 48 MGD.

Henry County Water Authority – Water and Sewer Master Plan Update

ESI is updating the 30-year master plans for the Henry County Water Authority’s water and sewer systems. These important updates to the plans will be used by the Authority in preparation of 5-year Capital Improvement Plans through the Year 2045. The updated plans will also be submitted to the Metropolitan North Georgia Water Planning District for the District’s 2016 updates to the Long-Term Wastewater Management Plan and the Water Supply and Water Conservation Management Plan.

Gwinnett County Department of Water Resources – Wastewater Pump Station Condition Assessments

In an effort to better plan the needed improvements within the wastewater pump station system, the Gwinnett County Department of Water Resources (GCDWR) planned a project to conduct condition assessments of the existing pump stations. The project began in 2011 with ESI helping to define the scope of work for the project, plan the assessment procedures, preparing an assessment checklist for each type of pump station, assisting with development of a priority ranking system, and conducting assessments on an initial group of pump stations. After the initial group of stations, the project expanded to cover over two hundred (200) pump stations.
The assessments involved performing site visits to each pump station to evaluate the physical condition of the site assets. This included the driveway, access gates, parking areas, site pad, surrounding perimeter property, fencing, wet wells, valve vaults, storage tanks, pumps, piping and valves, site lighting, generators, electrical panels, and other miscellaneous assets which are present at the pump stations. Additionally, pump drawdown tests were conducted at each site to allow for comparison of the pump operation with the data in the County’s database and pump curves on file. ESI also provided estimates of the remaining useful life of the key assets based on the findings of the site assessments. ESI is now assisting Gwinnett County in implementing the repairs to the pump stations as recommended in the condition assessment reports.

Cobb County Water System – South Cobb Water Reclamation Facility Chemical Systems Upgrade

The Cobb County Water System hired Engineering Strategies, Inc. to provide a design to replace the entire ferrous chloride feed system, to replace existing metering pumps for several chemicals with peristaltic pumps and to evaluate the conversion of the existing hypochlorite system for effluent disinfection from bulk chemical use to an on-site hypochlorite generation system. The ESI team conducted workshops and prepared a Design Development Report that served as the basis of design. The team also prepared construction drawings and technical specifications for the improvements that will be constructed beginning in 2014

Cobb County-Marietta Water Authority and City of Canton, GA – Hickory Log Creek Reservoir and Pump Station SCADA

The Hickory Log Creek Dam, Reservoir and Pump Station were constructed between 2005 and 2008. The dam is 180 feet high that was built using roller-compacted-concrete. Between 2010 and 2014, ESI assisted the project owners in designing and implementing a Supervisory Control and Data Acquisition (SCADA) that allows automated control and remote monitoring of multiple components associated with the dam, reservoir and pump station. The project included addition of electric actuators for sluice gates and valves, temperature and water quality sensors, and a flow meter to measure drainage from the interior dam gallery.

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