GMC Water Treatment Brochure

Advanced Water Treatment

A CLEAR CHOICE Water is one of the most critical resources in the world. The ever-changing environmental water quality impacts, regulations and increasing demand continue to make water exploration, development and treatment more challenging. GMC recognizes the need to develop feasible and costeffective solutions to complex water problems to support growth and enhance the quality of life in the communities we serve. Our team of highly-qualified hydrogeologists, technical experts and environmental, civil and process engineers offers a full range of services to provide utilities and municipalities a single source for all of their water planning, conveyance, transmission and treatment needs.

SERVICES Grant & Funding Assistance Capital Improvement Planning Conceptual & Feasibility Studies Pilot Studies Rate Study Evaluation Water Quality Analysis Regulatory Evaluations Environmental Agency Responses Water & Wastewater Permitting Treatment Process & Facility Design Energy Management Assessment SCADA & Instrumentation Evaluation Environmental Engineering Hydrogeological Studies Cost Estimating Construction Engineering & Inspection Risk Management Assistance Water Protection Planning General Engineering Services Treatment Evaluation & Troubleshooting Operator Training

Gadsden Water Treatment Plant GADSDEN, ALABAMA

The 24 MGD Gadsden Water Treatment Plant was renovated and the MIEX process added to improve removal of organics, the precursor to disinfection by products, and to improve the mixing, flocculation and sedimentation processes at the facility. The MIEX facility is currently aiding the utility in providing water to its constituents with some of the lowest DBP concentrations in the state for a surface water facility, thus decreasing the ingestion of carcinogenic compounds. The MIEX process uses a magnetized anion exchange resin specifically designed for use as a fluidized bed process for the removal of dissolved organic carbon and other anionic contaminants in drinking water.

• Included variable speed mixing and flocculation for the south side treatment train • MRI hoseless sludge collection systems used for sludge removal • Enhanced structural elements of the concrete basins to increase longevity of the structures • Reduced DBP levels to the distribution system and wholesale customers • Reduced coagulant usage

Startex-Jackson-Wellford-Duncan Membrane Plant Expansion LYMAN, SOUTH CAROLINA

To accommodate industrial growth in the area, GMC assisted the Startex-Jackson-Wellford-Duncan (SJWD) Water District in obtaining an EDA grant to fund approximately half of the capital improvement project to expand its existing 4 MGD membrane treatment facility to 8 MGD. The project included horizontal shaft flocculators, plate settlers and sludge collection to pretreat raw water prior to the membranes. The membranes were fed with a vertical turbine pump and prescreened with a feed strainer. The membrane racks consisted of 76 microfiltration units per unit at 538 sf per module.

• Other process improvements consisted of installation of two sodium hypochlorite bulk storage tanks and accessibility to accommodate installation • Included fluoride chemical feed improvements to improve operations of dosing • Outfitted unfinished mezzanine in the existing membrane building with a full water quality and bacteriological laboratory for daily operations, as well as a control room, shower/locker facility, break room and an additional office, totaling approximately 2,100 sf

Anderson Regional Joint Water System Advanced Oxidation Process ANDERSON, SOUTH CAROLINA

Anderson Regional Joint Water System (ARJWS) experienced taste and odor issues associated with algal blooms and deleterious compounds such as MIB and geosmin, in addition to issues with iron and manganese. GMC devised a solution using a threephased approach to meet the needs of the 48 MGD water treatment plant, which serves 14 member agencies. Phases included 1) researching taste, odor and color, iron and manganese and emerging contaminants; evaluating current treatment process and developing a matrix for current issues versus treatment technologies; 2) analyzing identified technologies; and 3) providing treatment recommendations, along with expenditures, life-cycle cost analysis and a path forward. As a result of the study, the advanced oxidation process (AOP) utilizing ozone and hydrogen peroxide was selected. GMC teamed with Brasfield & Gorrie as the Construction Manager at Risk to deliver these process improvements to the water treatment facility. Design was completed in January 2017, with construction beginning in February. The project is slated for completion in early 2018.

• Installation of two 1,000 lb/day ozone generators with a hydrogen peroxide dosing system for AOP and quenching • Construction of concrete ozone contactor with a contact time of 10.7 minutes at 48 MGD • Injection system selected to introduce ozonated water into the raw water achieving 90% or greater mass transfer efficiency (MTE)

Coosa Valley Water Supply District Water Treatment Plant ST. CLAIR COUNTY, ALABAMA

GMC initiated the planning and development of a 3/6 MGD water treatment plant on the Coosa River. Four entities form this water supply district, including the City of Pell City, Odenville Water Board, St. Clair County Commission and the City of Springville.

• Obtained grant funding and reclassification of the river • Rated at 3 MGD at a filter rate of 2 gpm/sf of filter area and 6 MGD at 4 gpm/sf • Raw water intake with fixed screens on the Coosa River and the adjoining quarry • Included raw water pumping station and raw water main; chemical coagulation; bleach disinfection; flocculation and clarification process; mixed media granular activated carbon filters; finished water clearwell 750,000 gallons; high service pumps; sludge settling lagoons; and SCADA system

Orange Beach Water Treatment Plant ORANGE BEACH, ALABAMA

GMC worked with the Orange Beach Water Authority on the design, construction and numerous upgrades for the Orange Beach Water Treatment Plant. The plant treats well water from eight nearby well sites at a central water treatment facility.

• D esigned an on-site sodium hypochlorite generation system to replace the plant’s chlorine gas system and one-ton cylinders, reducing risk management requirements of the facility and threat of a chlorine gas leak • Design included a dilution panel for necessary disinfection redundancy • Aerators, flocculation and greensand media filters to treat high levels of iron and manganese and to produce quality effluent • Filters provide air and water scouring to improve filter run times and reduce backwash • Expanded plant capacity to 12 MGD in 2003, with additional improvements completed in 2011

South Dallas Water Treatment Plant SARDIS, ALABAMA

GMC completed a 1,500 gpm water treatment facility for the South Dallas Water Authority to provide aeration and pressure filtration. Because the facility was designed on a small parcel of land, a small footprint was required. Engineers designed the treatment above the clearwell to meet these needs.

• Green field design provides iron and manganese removal, as well as disinfection • Aeration located on building exterior and three pressure filters fully enclosed in an architectural CMU block • Three pressure vessels designed with filter flow rates of 6.4 gpm/sf and GreensandPlus filter media with specially graded Ferrofilt; 36-inch deep filter beds provide adequate depth for pressure filtration and removal of iron and manganese • Backwash water from facility is conveyed to an adjacent pond for sludge removal and decanting of settled water

Viola Road Water Treatment Plant GULF SHORES, ALABAMA

Because the well site was located within a residential area, GMC engineers worked with Gulf Shores Utilities to develop a plan and footprint that fit the 100 x 150-foot lot and blended with the aesthetic of the surrounding neighborhood. The collaborative effort produced a 4 MGD treatment facility with aeration, lime addition and disinfection processes that not only met the client’s needs, but was also well received by local residents.

• Utilized sound attenuation features to reduce noise • Constructed the 250,000-gallon clearwell for disinfection below grade with access hatches in the interior of the building to reduce the process footprint • Designed with a house facade to disguise the facility, with the aeration system in the rear of the property disguised using the structure’s architectural features • Other features included architectural shingles, brick columns, window fixtures and FRP products

Gautier Water Treatment Plant GAUTIER, MISSISSIPPI

The goal of the City of Gautier’s water filtration project was to remove the brownish tint in the water pulled from some of the City wells, with comparatively low capital costs and low operations and maintenance cost. Following a study, research, site visits and piloting, GMC’s team of professionals determined that pressure filtration followed by ion exchange offered similar clarity as reverse osmosis, with significantly reduced annual operations and maintenance costs. Gautier’s ion exchange filtration system is the first water filtration system in Mississippi to utilize the cutting-edge technology for a public water supply.

• Piloted granular activated carbon (GAC) and ion exchange • Designed and constructed a 1 MGD ion exchange facility • Pipe system tied the four wells with the most significant brownish tint to the filtration system to distribute the filtered water through the City’s water system

Cullman Water Treatment Plant CULLMAN, ALABAMA

GMC has provided engineering services on a variety of improvement projects for the Cullman Utilities Board including the addition of a reservoir and supplemental river supply pipeline, rehabilitation of the intake and installation of a powdered activated carbon (PAC) feed system. The most recent Capital Improvements Project for the 24 MGD Cullman Water Treatment Plant involves rehabilitating the aging equipment and infrastructure, as well as adding a new chemical building to improve operator safety. The project also included the following improvements: • Renovation of pipe galleries to include hard piped drain troughs reducing moisture • Replacing 100 valves, actuators and associated pneumatic system • Replacing flocculator equipment with stainless steel components • Constructing new chemical building to provide a common location for chemicals and reduce personnel contact • Replacing hazardous chlorine gas with bulk sodium hypochlorite system • Upgrading the SCADA and security systems

Laguardo Water Treatment Plant LEBANON, TENNESSEE

The Laguardo Utility District wanted to produce its own potable water for its customers rather than purchasing from neighboring districts. Because the system design was challenged during the permitting phase when the Corps of Engineers declined the permit application to withdraw water from the nearby Cumberland River (Old Hickory Reservoir), GMC modified the design to include an intake from groundwater sources.

• Treatment processes consisted of chemical addition with flash mixer, clarifier and 4 MGD membrane treatment system • Utilized closed loop backwash system to return water to the treatment plant • Included 19,957 sf treatment plant encompassing 1,286 sf of office; 1,837 sf mezzanine with lab space; and an additional 400 sf chemical feed building constructed off the south end

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