Georgia Power’s Plant Hammond is an 800-MW, coal-fired power generation facility with four units. The facility withdraws approximately 655 million gallons of water per day from the Coosa River on a once-through basis to condense steam used to drive the generator turbines. Georgia Power retained Geosyntec to assist them in complying with the requirements for cooling water intake structures (CWISs) under Clean Water Act Section 316(b) in a manner that had least impact to plant operations. Section 316(b) requires that the location, design, construction, and capacity of CWISs reflect the best technology available for minimizing adverse environmental impacts. Geosyntec was asked to prepare supporting documentation and conduct site-specific studies characterizing existing impingement mortality, with the ultimate objective of completing a successful 316(b) comprehensive demonstration study for this facility.
Geosyntec’s Scope of Services
Geosyntec prepared the Proposal for Information Collection (PIC) and associated Sampling Plan for conducting the Impingement Mortality Characterization Study (IMCS). Our biologists prepared the PIC maximizing the use of existing fish community data and knowledge of site-specific conditions and plant operations to justify study requirements, thereby limiting the scope of new impingement mortality field studies to bi-weekly for one year.
Geosyntec conducted field studies to delineate the CWIS hydraulic zone of influence by applying state-of-the-art acoustic Doppler current profiling techniques to measure and map water velocities and vectors in the vicinity of the Plant Hammond CWIS.
Geosyntec biologists also worked closely with Plant Hammond personnel to design a collection device that diverts the screen-wash from traveling screens to a shoreline structure that provides safe access and working conditions under all flow conditions.
Geosyntec’s in-depth knowledge of the Phase II 316(b) rule and actual Phase II experience at other power plants was instrumental in getting Georgia Power’s compliance program underway in an efficient and timely manner. We were able to successfully complete the required field studies characterizing fish and shellfish impingement for the plant’s CWIS, and we completed and submitted the final IMCS to Georgia Power for subsequent submittal to the Georgia Environmental Protection Division. The study will support Georgia Power’s achievement of 316(b) compliance objectives for Plant Hammond.