Rivanna Water and Sewer Authority (VA) Upgrading System

Hazen and Sawyer to Perform Stage 2 Disinfection and Disinfection Byproducts Optimization Study

Ragged Mountain Reservoir, part of the RWSA system

(CHARLOTTESVILLE, VA – April 17, 2010) – Rivanna Water and Sewer Authority (RWSA) has selected Hazen and Sawyer to review, analyze and recommend improvements to the Urban, Crozet, and Scottsville Water Treatment Plants and associated distribution systems to fully comply with the requirements of the Stage 2 Disinfectants and Disinfection Byproducts Rule.

The work will include a review and analysis of the plants and distribution systems, preparation of a report detailing compliance recommendations, and work with the Regional Water Work Group on the recommendations and implementation plan.

The existing plants processes will be reviewed for optimization opportunities, and new technologies evaluated for plants where they may be needed for Rule compliance. New technology costs such as GAC contactors and MIEX ion exchange will be evaluated based on both economic and non-economic factors such as constructability, ease of implementation, regulatory acceptance, and corrosion impacts.

Work will also include a water distribution analysis to identify areas with long detention times and develop strategies for reducing water age through operations and distribution system modifications. Hazen and Sawyer will also conduct a review of the distribution system layout, operations, water quality (chlorine residuals, DBPs, etc), prior tracer studies, and other previous evaluations conducted by RWSA.

Three Regional Water Work Group meetings will be held to discuss options for treatment upgrades and distribution system modifications as well as the costs, timing, and scheduling of plant upgrades for each water plant.

The Rivanna Water and Sewer Authority is an independent public agency providing impoundment, treatment, storage and transmission of potable water and transport and treatment of wastewater for the citizens of Charlottesville and Albemarle County, Virginia.

Since our founding in 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater and stormwater collection, treatment, and reuse.

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