Gresham Smith is proud to announce that two engineers from the firm’s Water + Environment market will present at the 2022 Georgia Association of Water Professionals Annual Conference. The conference will take place July 17 – 20 at the Savannah Convention Center in Savannah, Georgia.
See below for summaries of the presentations.
Chattanooga South Chick EQ Station Design Challenges and Innovations
Presented by Senior Engineer Rebecca Lindsay, P.E.
The South Chickamagua Equalization Station is one of several off-line wet weather equalization facilities being delivered under the City of Chattanooga’s “Clear Chattanooga” consent decree sewer program. The project team was challenged by site constraints, which ultimately provided an opportunity for innovation. This presentation will share how the project team overcame a remediated site that was located within the floodplain and contained a City greenway to deliver an equalization station that will provide temporary bypass bumping, enabling the City to complete much-needed upgrades in the future.
A Claim of TTHM Reduction, but Were They Just Blowing Air?
Presented by Gresham Smith Senior Engineer Rebecca Lindsay, P.E., and City of Palmetto Water/Wastewater Superintendent Matt Ivester
With EPA’s Stage 2 Disinfectants and Disinfectants Byproducts (DBP) rule and its associated Initial Distribution System Evaluation (IDSE), it is imperative to maintain Total Trihalomethanes (TTHM) below the Maximum Contaminant Level (MCL) of 80 ppb for compliance. While the City of Palmetto comfortably complies with the DBP rule, in the summer of 2021 they embarked on a project that would increase its water age. Because TTHMs increase with water age, the City was concerned with future compliance and called on Gresham Smith to assess their water supply and reduce TTHM levels in their storage tanks. This presentation will highlight how the project team ultimately achieved an 89% Chloroform reduction in one tank and a 68% reduction in another, despite a number of challenges.
Managing 2,378 Pipe Segments in South Fulton County
Presented by Gresham Smith Engineer-in-Training Diana Chumak and Senior Engineer Rebecca Lindsay, P.E., and Fulton County Deputy Director Terry Peters, P.E.
Fulton County, Georgia owns and operates a sanitary sewer network that serves south Fulton County including the cities of Chattahoochee Hills, College Park, East Point, Fairburn, Palmetto, South Fulton, Union City, and portions of Atlanta and Tyrone. To help the County meet the growing needs of all the south Fulton cities through a planning horizon of 2050, the County commissioned Gresham Smith to prepare a hydraulic model update, Capacity Evaluation and Capital Improvements Program. The firm’s evaluation ultimately identified 122,500 linear feet of new gravity sewer and 34,600 linear feet of replacement sewer, along with eight new pump stations, and 92,700 linear feet of new force main. This presentation will cover the technical approach and challenges overcome in updating Fulton County’s south wastewater collection system hydraulic model and share how to approach similar modeling update and master planning processes.
