Wednesday 1:10 Griff Wyatt, PE Barge Waggoner Sumner & Cannon
North Potato Creek In-Pit Water Treatment Plant at the Copper Basin Mining Site
Griff Wyatt, P.E.
To protect the Ocoee River from acidity and metals loadings from historical copper mining activities, OXY USA is conducting removal actions to alleviate contaminant discharges from North Potato Creek (NPC). One such action is construction of an innovative in-pit lime treatment facility at the South Mine Pit (SMP) designed to treat variable NPC flows ranging from dry weather flows of 9 cfs to a 10-yr, 24-hr storm of 972 cfs for 15% of the cost of a conventional lime treatment plant. The treatment facility utilizes high dissolved solids water from the lower portion of the stratified SMP as seed water to enhance flocculation of iron precipitates and the large surface area of the SMP as a settling basin. The in-pit lime treatment facility operates in the following manner. A portion of the flow is pumped from NPC to a rapid mix tank (RMT) where lime slurry, air, and high dissolved solids water from the pit are added. The RMT discharge flows back into NPC where it mixes with the remainder of the NPC water and ultimately discharges into the 20 acre SMP. The SMP provides an effective settling basin for the precipitated solids from the NPC flow. The in-pit plant operations began in January 2005 and early results show that reductions in dissolved metals loading of 650 lbs per day to the Ocoee River are being achieved.
BiographyGriff Wyatt is a Senior Environmental Engineer and Project Manager with Barge, Waggoner, Sumner, and Cannon in Nashville, Tennessee. He earned his Bachelor's Degree in Civil Engineering and Master's Degree in Environmental Engineering from Vanderbilt University. He is a registered engineer in Tennessee, Florida, and Indiana. He has worked in environmental consulting for 26 years and has been working on the environmental restoration program at the Copper Basin Mining District site for the last four years.