A New Language for Permitting Negotiations Defines Feasible Alternatives
This paper presents a perspective on current regulatory limitations for sanitary sewer systems. It also presents new permitting language that describes collection system performance which could help utility owners clarify compliance interpretations and open a dialogue with regulators. A common, but important, permitting negotiations point is how to better define key permit language expectations such as how feasible alternatives are linked to system performance.
System owners know that overflows from the collection system may occur even if the system is well designed and maintained. Those overflows from well designed and maintained systems are often associated with events outside the planning, design and operational performance parameters of the system and well accepted engineering practice and standards. Collection system capacity and management, operations and maintenance (CMOM) approaches have not been refined and developed and approved as policy or guidance and are not coordinated or linked with the technology- and water quality standards of the CWA.
Generally accepted engineering and economic practices identify the best technology, along with specific design options and management practices. The risk analysis provides information on the consequences of various alternatives, allowing a POTW to determine if there are “feasible alternatives,” that is, if additional investment and /or improved O&M will reduce sewerage-related risks to public health and the environment. This paper describes how both operators and regulators can use similar permitting terms to evaluate whether system failures were avoidable and if further facilities and controls are required to manage wet weather flows.
The paper also discusses how the management of the conveyance system must consider the difference between system deficiencies that they can correct and system failures due to extreme weather or other conditions that may result in overflows that cannot be prevented by any reasonable plan or design. Both preventable deficiencies and failures from extreme conditions interfere with how a system is intended to function. However, they are fundamentally different. The paper presents the basis for these differences and how this sets the stage for new permitting language.
System deficiencies must be corrected. System failures should be viewed as performance exceptions and may or may not be corrected based on their mode of failure and feasibility of corrective actions. Both system deficiencies and system failures pose potential risks, but they pose different planning and management challenges to determine acceptable levels of risk since treatment and conveyance systems cannot be managed or operated risk-free any more than any other built system.
Examples are presented in the paper of how system failures represent the practical limitations of wastewater treatment and collection systems to operate in extreme wet weather or other conditions that exceed generally accepted engineering design and construction practices.
Keywords: CMOM; Feasible alternative; affirmative defense; diminishing return; discharge permits; exceptions; permit application; permit negotiations; prohibit; risk; system deficiency; system failure; violation
Document Type: Research Article
Publication date: 2010-01-01
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