MONITORING WELL REHABILITATION AT THE DEPARTMENT OF ENERGY PADUCAH GASEOUS DIFFUSION PLANT PADUCAH, KENTUCKY

摘要

The purpose of the monitoring well (MW) maintenance implementation plan is to protect and maintain the integrity of the MW network at the Paducah Gaseous Diffusion Plant (PGDP) to obtain representative groundwater samples. Recent downhole investigations at PGDP [1,2,3] indicate that the most common maintenance problems of the MWs are biofouling and corrosion. The recent video camera inspections revealed evidence of active corrosion of the stainless steel casings and biofouling across the intake screens of 75 monitoring wells. This plan combines regular assessment of each well’s physical condition and performance along with Blended Chemical Heat Treatment (BCHT BCHTTM TM) to control biofouling and microbially induced corrosion within the well screen and casing. This MW maintenance implementation plan outlines MW evaluation methods including downhole equipment examination, video inspection, physicochemical, and historical data and information review. In addition, each phase of the BCHT ) BCHTTM TM MW rehabilitation method is described. A schedule to maintain the compliance, surveillance, and water level wells has been developed. Generally, the order of prioritization is compliance wells first, surveillance wells next, and water level wells last. This order was selected based on the fact that compliance wells are sampled for permit and regulatory requirements. The Waste Management Section summarizes the requirements (regulatory and PGDP specific) and estimated quantities of wastes associated with the implementation of the BCHT BCHTTM TM. This section addresses the management of wastes from the point of generation through characterization and disposal. Standard practices and procedures regarding the handling, transportation, and storage of wastes will comply with the Resource Conservation and Recovery Act and the Toxic Substances Control Act.