CARROLLTON WATER WORKS - Executive Summary |
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The Federal Resister/Vol 61, No. 120/Thursday, June 20,1996 amended 40 CFR Part 68 to include the U.S. Environmental Protection Agency's (USEPA) Risk Management Program. This program requires facilities that have a regulated substance above the listed threshold quantities to develop a formal Risk Management Program (RMProgram) and to register and submit a Risk Management Plan (RMPlan). The City of Carrollton is subject to this regulations as the owner and operator of the Carrollton Water Treatment Plant located at 1007 North Park Street, Carrollton, (Carroll Country), Georgia. This facility is a stationary source of chlorine ( a regulated substance) in excess of 2,500 pounds. A RMProgram has been developed to meet the intent of the regulations for this facility using Program 2. Information from the Federal Register, AWWA's Compliance Guidance and Model Risk Management Program for Water Treatment Plants, and EPS's Risk Management Program Guidance For Wastewater Treatment Plants (40 CFR Part 68) were used as resources for the development of this program. The Carrollton Water Treatment Plant uses chlorine in its potable water treatment process to disinfect surface water obtained from raw water reservoirs. The chlorination process includes the storage of up to eight (8) 1-ton cylinders of liquid/gaseous chlorine. The process is located within a closed building utilizing a vacuum feed system, instrumentation, process specific piping and connection materials. A hazard assessment was conducted at the facility to determine the past history of accidents or re- leases of chlorine. Plant records and interviews with current plant personnel indicated there have been no releases of chlorine in the past five years that resulted in injury, death or property damage. In compliance with the regulations, a worst-case release scenario was modeled using the EPA RMPComp dispersion model to determine the potentail impact of such a release. The worst-case scenario assumes that a one 1-ton container releases 2,000 pounds of gaseous chlorine over a 10-minute period. The model predicted that areas within a 1.3 mile radius of the plant could be ad- versely affected by such a release. This area includes public receptors such as private residences, schools, churches and places of business. An alternative-case scenario was also modeled using RMPComp to model the effects of a more probable release. This scenario involved a valve failure resulting in the release of 200 pounds of chlorine in a time frame of 10 minutes with the distance to end point being 0.3 miles. |