Resolution No. 4793 - Laserfiche WebLink

Home Browse Search

MWMC FACILITIES PLAN For the alternative scenario4, the endpoint concentration was reached at a distance of less than 0.1 mile. The radius does cross the fenceline of the facility on the east side, but no dwellings exist in this area. The only offsite consequences under th/s scenario are a bike path, and a recreational vehicle dump site on the north side. Both chlorine and sulRu' dioxide were analyzed under the alternative release scenario and similar endpoints were determined. Prevention Program The EPA prevention program is a substantial element of the l~2vIP rule. This program focuses on employees at the facility and includes a list of ten components of compliance. These components can be satisfied by complying with similar requirements of the Occupational Safety and Health Association (OSHA) Process Safety Management (PSM) program. The WPCF met the final OSHA PSM compliance deadline of May 1997. Risk Management P~an The risk management component of the RMP consists of completing general paperwork and submitting it to responsible agencies and to the public. The risk management section completed for the WPCF includes the following sections: Description of major hazards, such as equipment failure, human error, and nabaral phenomena, that could lead to a significant accidental release Description of the consequences of failing to control for major hazards Summary of all actions taken or planned to address these hazards, including starting states · Methods for prevention or mitigation of significant accidental releases Public Health Risk from Chlorine and Suffur Dioxide Chlorine and sulfur dioxide are extremely hazardous substances. Increasing concerns about security and the potential severity of life safety consequences of an uncontrolled major release resulted in a review of alternative disinfection technologies. The M~IC is interested in replacing gaseous chemical disinfection with a safer alternative disinfection technology such as hypochlorite and bisulfite solutions. Until then, the risks associated with the use of chlorine and sulfur dioxide will continue to be managed through controls such as regular maintenance, engineering features to contain and treat contaminated air, training and work rules at the facility, and operational safety procedures. Air Toxics and Regulatory Assessment Based on regulatory review, there are no significant, outstanding air quality compliance issues for the WPCF. The facility is in compliance with all federal regulations and with 4 The alternative release scenario allows the use of active mitigation such as the scrubber system. The scrubber system was assumed to be 99 percent efficient and the endpoint concentration was reached at a distance of ~ess than 0.1 mi~es, he scenario itself was based on a break in a one-inch pipeline used to transport liquid chlorine or suffur dioxide from the cylinder to the evaporator. A pipeline break was chosen for the analysis not because it represents the most likely scenario, but it does represent a more conservative estimate. The release rate from the broken pipeline in pounds per minute was determined using tables furnished in the guidance documents from EPA for wastewater treatment facilities. 2-14 ~MC_z0_REV23 DOC