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40 40 ATTACHMENT B SCOPE OF WORK Task 700 - RiSK MANAGEMENT/ACCIDENTAL REi..EASE PREVENTION PIAN HAZARD ANALYSISIASSESSMENT Legislation signed as part of the Clean Air Act Amendments (November 15, 1990) included provisions for regulations to be issued by the Environmental Protection Agency (EPA) that would provide significant protection in the event of an accidental release of a hazardous substance. In separate regulations promulgated on January 31, 1994, and on June 20, 1996, EPA created the Accidental Release Prevention (ARP) program. These regulations require that all facilities affected by the ARP program prepare and submit a risk management plan (RMP) no later than June 21, 1999, which documents the hazard assessment, prevention program, and emergency response program necessary to protect public health and the environment in the event of a catastrophic release of some 140 regulated substances. Consistent with these requirements, the County has formed a team composed of utility, risk management and emergency services staff to develop a strategic approach to comply with and to implement the ARP program at its water and wastewater treatment facilities. This work authorization provides for performanee of hazard analysis/assessment and offsite consequence analysis by CDM personnel For inclusion in the County's Risk Management/Accidental Release Prevention Plan. CDM will perform the following tasks at the South County WTP, North County WTP, South County WWTP and Central Region WWTP: Task 1 - Review and 'Validate Process Safety Information CDM will review the safety information for the regulated process (chemical data, technology of the process, and process equipment). Specifically, CDM will review information on the toxicity, reactivity, stability, and corrosivity of each chemical in the process with particular attention to the hazardous effects of inadvertent mixing that could occur. We will also review the information available on site regarding the technology of the process including process flow diagrams, operating procedures, process chemistry, safe upper and lower limit operating conditions (temperature, pressure, flows, and composition), and the consequences of deviations. Finally CDM will review process equipment information including process and instrumentation diagrams (P&[Ds), electrical classification, reliefand ventilation systems, safety interlocks, and material and energy balances. We will note significant discrepancies prior to completing tile Process Hazard Analysis. The purpose of this review is to verify that the quantity and quality of information available is adequate to allow the process hazard analysis team to work efficiently. Task 2 - Process Hazard Analysis (PHA) With the participation of three to six County employees, two CDM employees will conduct a process hazard analysis for the disinfection processes at the County's two water treatment plants and two wastewater treatment plants (South and Central). This review will involve an analysis of, factors that can lead to disruptions of the disinfection gas processes, the likely consequences of a release, and interventions that can reduce the probability or severity of a release. County personnel that will need to attend include process operators (one senior and one junior, if available), maintenance personnel, and at. least one technical or supervisory employee who has experience and knowledge specific to the disinfection process. While this process usually takes three three-hour meetings, we ask the County to make these persons available for four such meetings (morning and afternoon of two days) at each facility.