Smart CSO Control Plans
Many of New Jersey’s oldest cities still rely on combined sewer systems — systems in which stormwater runoff from city streets feeds into sewer lines and is treated, along with sewage, by treatment plants. Some of these systems are more than 100 years old.
During heavy rainfalls the volume of stormwater in the older, combined systems can overwhelm the capacity of the treatment plant. When that happens, combined sewage can overflow into area waterways, or back up into streets, public spaces such as parks, and sometimes even residential basements. This makes the sewage treatment plant operator vulnerable to lawsuits under the federal Clean Water Act.
Jersey Water Works’ initial efforts involve working with communities and utilities that have combined sewer systems, to help them identify and implement the appropriate combination of strategies to reduce sewer overflows.
An index of resources categorized by their pertinence to the Long-Term Control Plan process and intended for permit holders can be found here: JerseyWaterWorks.org/CSOLTCPresources
Hidden Capacity: How Proper Maintenance and Cleaning of Sewer Systems Can Have Huge Benefits!
Issued by the JWW Combined Sewer Overflow Committee, the purpose of this paper, Hidden Capacity: How Proper Maintenance and Cleaning of Sewer Systems Can Have Huge Benefits, is to highlight the importance of sewer cleaning and inspection as critical elements of a proper and effective sewer system operation and maintenance program. Additional basic, cost-effective “gray” type controls, which have the potential to reduce combined sewer overflows (CSOs), sewer backups, and flooding significantly, are also presented. The cleaning and proper maintenance of sewer collection systems is relevant to both combined sewer systems (i.e., systems that convey sanitary/industrial flows as well as stormwater) and separate sanitary systems (systems that carry only sanitary/industrial flows). This paper also provides regulatory recommendations to help ensure that municipalities/utilities are implementing these basic, cost-effective control measures and are operating and maintaining their collection systems properly.
Balancing Green and Gray Solutions to CSO Management
The purpose of this report, Balancing Green and Gray Solutions to CSO Management, is to provide guidance to CSO permit holders and their Supplemental CSO Community Teams, to help guide the development of LTCPs for determining an optimal green/gray balance. Although the target audience is permittees and their communities, other readers should benefit from the summary of current CSO programs. It is recognized that there are varying paths towards inclusion of GI into LTCPs. Developing a methodology to measure and communicate the balance of green and gray infrastructure is an important component of CSO LTCPs. It is also desirable to promote the use of best practices like the USEPA’s community alternatives analysis roadmap with all CSO permittees. This report is not, however, intended to provide detailed technical guidance to permittees.
CCMUA: Incorporating Community Interests into Effective Infrastructure Decision-Making
This case study, Camden County Municipal Utilities Authority: A Wet Weather Case Study of Incorporating Community Interests into Infrastructure Decision-Making, describes the ways in which the Camden County Municipal Utility Authority (CCMUA), together with the U.S. EPA Office of Wastewater Management and representatives from the community-based Camden SMART Initiative, used an augmented infrastructure alternatives analysis approach to help CCMUA identify an optimal and cost-effective mix of green and gray infrastructure to support its Combined Sewer Long-Term Control Plan. The approach described in this case example is transferable to other communities facing a myriad of infrastructure challenges.
The method used by CCMUA is designed to engage community stakeholders in the infrastructure alternatives analysis process at a very early stage. The approach described in this case example will help CCMUA communicate with their board members and other decision makers to ensure these individuals have a clear understanding of the choices before them as they make the critical financial and policy decisions necessary to ensure the utility’s infrastructure is sustainable over time.
Evaluating Green Infrastructure: A Combined Sewer Overflow Control Alternative for Long Term Control Plans
The intent of this document, Evaluating Green Infrastructure: A Combined Sewer Overflow Control Alternative for Long Term Control Plans, is to provide guidance to Combined Sewer Overflow (CSO) permittees within the State of New Jersey to evaluate green infrastructure (GI) as part of their Long Term Control Plans (LTCPs).
LTCP implementation will be a long and expensive process. Many of the alternatives that will ultimately be implemented to address CSOs will be built on publicly owned land, the cost of which will be borne primarily by the rate payer. GI, however, can and should be implemented both on publicly and privately owned land, allowing the cost of GI to be shared by both the rate payers and private developers.
This guidance is not intended to be the sole resource for evaluating this alternative. This guidance provides case studies, links, and resources to assist
a CSO permittee with including GI as part of its CSO Long Term Control Plan.
Impact of Proper Maintenance of Combined Sewer Overflow System on Flooding in the City of Camden
This fact sheet was prepared by the Jersey Water Works Best Practices Committee. It summarizes a case study performed by CDM Smith, an engineering firm, and commissioned by the Camden County Municipal Utilities Authority. The Impact of Proper Maintenance of Combined Sewer Overflow System on Flooding in the City of Camden was predicted by modeling Camden’s combined sewer system (CSS) and measuring the changes in the volume of stormwater conveyed to water pollution control facilities (WPCFs), combined-sewer overflows (CSOs), and flooding in the City of Camden as a result of cleaning pipelines and removing build-ups of silt and debris.