Rock Run Water Treatment Facility - Executive Summary |
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The Rock Run Water Treatment Facility handles 6, 1-ton containers of liquid chlorine. As a result, accidental release prevention and emergency responsibilities have been instituted which include: operating and maintenance procedures, training and incident investigation programs for handling chlorine, notification of trained personnel, an on-site emergency response plan and procedures for notification of local emergency planning individuals in the event that local emergency response is needed. The Worst Case Release Scenario as described in this program is the release of the entire contents of a one-ton liquid chlorine container in ten minutes, or 200 lb/min. For the worst case release scenario, a wind speed of 1.5 meters/sec. and an atmospheric stability class F was used. Using approved EPA tables and default values, the distance to the toxic endpoint was determined to be 3.3 miles. The Alternative Release Scenario as described in this program was based on a two-phase release of chlorine from a container isolation valve stem failure. Using the EPA Guidance Document for Wastewater Treatment Facilities, the release rate was determined to be 0.29 lb/min. and the distance to the toxic endpoint was determined to be 0.01 miles. The chlorine accidental release prevention program in place at the facility provides written procedures that incorporated operational and maintenance data and training procedures for dependable use of relief valves, leak detection systems, and alarms. Mitigation systems in use include complete enclosure of the chlorine system. No accidents have occurred in the last five years. Procedures are in place to identify and record any future accidents or incidents. An on-site Emergency Response Program, including an evacuation plan, assembly areas, and other safety information has been developed. This program has been coordinated with the City of Coatesville's Emergency Response Program - SARA title II I off-site response plan. The off-site plan will supersede the on-site response program in the event that an accidental release extends beyond the facilities boundary. The City will update the program as required and will review the program every five (5) years or when applicable on-site conditions change. |