Project Name: East Area Water Quality Control Facility Improvements

Regulator and Custer Avenue WQCF. Flows from these facilities are then transported through the Intrenchment Creek Storage Tunnel for treatment at East Area WQCF. The capacity of the East Area WQCF is 20 mgd but can treat flows up to 34 mgd. The East Area WQCF needs upgrades and repairs to restore efficiency and reliability; in particular, the solid thickening and dewatering and vortex grit removal units require rehabilitation. In addition, the facility has significant corrosion and the filter building and residual handing units need replacement.

The scope of this project includes:
• Rehabilitating the sludge thickening and dewatering facilities
• Repairing the tunnel pump station outfall
• Repairing the East Area WQCF sedimentation basin
• Providing electrical improvements
• Replacing six sedimentation basin submersible sludge pumps
• Upgrading chemical system equipment
• Rehabilitating the East Area WQCF solids processing pump station
• Providing an update to the Foxboro control system software

Justification:
• Improves system reliability helps the City meet new permit requirements
• Provides safer working conditions for operating personnel
• Reduces imminent, short term, and long term compliance risks

Project Type: Water Quality Control Facilities
Project Budget: $8,050,200
Council District(s): 1, 12
NPU(s):
Project Status: Active / Design
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Project Name: West Area Water Quality Control Facility Improvements

The West Area Water Quality Control Facility (WQCF) treats excess combined sewer overflows (CSO) from Clear Creek, Tanyard Creek and North Avenue Combined Sewer Control Facilities (CSCF). Flows from these CSCFs are transported to R.M. Clayton Water Reclamation Center during dry weather conditions, and most storm events for treatment. The capacity of the West Area WQCF is 85 mgd. The treatment consists of fine screening through rotary drum screens, grit removal in four vortex separators with grit classifiers, high rate compressed media filtration, disinfection with sodium hypochlorite, and dechlorination with sodium bisulfite. The West Area WQCF is relatively new, and in fair condition, and these upgrades will ensure filters operate efficiently.

The scope of this project includes:
• Upgrading equipment in the sludge thickening and dewatering facilities
• Modifying filter compression plate to prevent loss of media from the filter cells
• Improving Pakscan Control system used to control filter actuators
• Making improvements to the sedimentation basin
• Repairing, replacing and improving various electrical equipment, performing arc flash study
• Repairing or replacing chemical system equipment
• Installing powered permanent samplers for upstream and downstream sample points
• Installing Foxboro software updates

Justification:
• Improves overall plant reliability and efficiency
• Replaces old and obsolete equipment
• Facilitates compliance with permit effluent discharge limits

Project Type: Water Quality Control Facilities
Project Budget: $25,382,507
Council District(s): 3, 6, 8, 9
NPU(s):
Project Status: Active / Design
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Project Name: Intrenchment Creek WRC Decommissioning/South River WRC Primary Clarifiers Replacement

Originally constructed in 1910 and upgraded in 1936, the Intrenchment Creek Water Reclamation Center (WRC) provides wastewater treatment for the northern half of the South River sewer service area, which encompasses portions of Atlanta and a small portion of DeKalb County. Because Intrenchment Creek WRC is no longer capable of meeting modern effluent limits, treated wastewater will be conveyed to the South River WRC for further treatment before being discharged to the Chattahoochee River under a National Pollutant Discharge Elimination System (NPDES) permit.

The scope of the South River WRC project includes:
• Providing primary clarifiers, head house and odor control ductwork
• Replacing chemical feed building and prefabricated warehouse building for new clarifiers
• Providing new poly aluminum chloride (PAC) chemical feed facility
• Rehabilitating the force main from Intrenchment Creek WRC to South River WRC headworks

The scope of the Intrenchment Creek WRC includes:
• Providing new grit traps for the Intrenchment Creek Sewer and the Sugar Creek Sewer
• Providing new effluent and influent pump stations and influent primary storage tank
• Providing odor control facility for bar screens and new primary storage tank
• Repairing Intrenchment Creek WRC force main
• Decommissioning primary and secondary treatment facilities

Justification:
• Allows wastewater to be sent directly to South River WRC for secondary treatment
• Leverages existing wastewater treatment assets while maintaining permit compliance
• Enhances system operational efficiency and reliability
• Reduces corrective and emergency maintenance

Project Type: Water Reclamation Centers and Facilities
Project Budget: $56,069,193
Council District(s): 1, 2, 3, 4, 5

NPU(s): E, J, K, L, M, N, O, S, T, V, W, Y, Z
Project Status: Active / Design
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Project Name: Levee Improvement and Anaerobic Digesters Improvement and Rehabilitation Project

The proposed Digesters Improvements and Rehabilitation project includes implementing needed improvements at the R.M. Clayton WRC (RMC WRC) to replace aging equipment and upgrade the anaerobic digestion process for improved performance, permit compliance, reliability, and safety. The RMC WRC sustained over $60 million damages from the September 2009 flood event that topped the current levees. The levees need to be raised in order to protect the facility from a similar event. The work needed is as follows:

• All four digesters to be cleaned out, inspected and repaired where necessary
• The existing floating digester covers will be replaced with fixed covers based on condition and need
• The existing gas mixing systems will be replaced with more effective pump mixing systems for better process control and efficiency
• Replace both boilers with new boiler equipment
• Replace heat exchangers with new equipment and controls (to be located in the existing headhouses)
• Provide a Boiler Building to house the new larger boiler system and avoid National Fire Protection Association (NFPA) building classification restrictions in the headhouses
• New prefabricated electrical buildings will be added to house the new electrical equipment and gear to avoid issues with NFPA building classification restrictions in the headhouses
• The levees need to be raised three feet

The digester improvements are proposed to be completed in two separate phases of construction. Phase 1 includes cleaning and rehabilitating Digesters 200 and 250, as well as replacing the digester cover on Digester 200. The cover on Digester 250, which was replaced in 2008, would be inspected to make sure it is functioning properly and, if so, would continue to be used. Phase 1 also includes modifying the operating protocol to combine pump station (PS) and waste activated sludge (WAS), installing new pump mixing, and constructing a new electrical building.

Justification

• Infrastructure Rehabilitation
• Improved operational efficiency
• Reduced energy requirements
• Resource recovery

Project Type: Water Reclamation Centers and Facilities
Project Budget: $50M
Council District(s): 2, 3, 4, 5, 6, 7, 8, 9
NPU(s): A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, S, T, V, W
Project Status: Active / Design
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