Springdale Water Utilities WWTF Master Plan

Springdale Water Utilities (SWU) selected Garver to perform a master plan and capacity study of existing assets to identify and budget for capital improvements at the Wastewater Treatment Facility (WWTF). Garver began by compiling and reviewing SWU’s historical flow and data. We performed a plant assessment and site walk-through to look for critical condition items to develop recommendations for modifications, upgrades, and additions to the plant. We also met with staff to discuss operational areas of concern and determine maintenance projects that should be included in the CIP.

With staff insight, site assessments, and a comprehensive data review, we developed the plant water system hydraulic model and the plant process model for existing facilities. From the evaluation, we determined several limiting factors at the facility that prevented it from treating the maximum month capacity flow of 24 MGD. From the study results, Garver developed a detailed master plan to determine the improvement needed for the facility to handle current and future flows, alternatives to for each planning horizon, and an implementation plan.

We used the Water Research Foundation Sustainable Infrastructure Management Program Learning Environment (WERF SIMPLE Tool), designed for asset management, to provide rankings for each of the major assets and process trains, identifying the highest risk assets.

The recommended alternative generally included influent pumping, aeration basin, final clarifiers, RAS/WAS pumping, and tertiary filtration improvements. Compared to other alternatives, the recommendation provided the lowest initial capital investment, minimized operational and maintenance cost, and maximized the available capacity of existing treatment units.

We developed alternatives to handle peak flows for short-term and long-term planning horizons. We recommended a phased implementation of improvements split into two phases, one now and one by 2029, to correspond to projections and when the WWTF will exceed the permitted capacity.