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The County Sanitation District No. 1 (CSD-1) of Sacramento County, California is completing a two-year project on the impact of grease accumulation in selected areas of their collection system. Current grease handling policies of CSD-1 and local food producing facility wastewater flows result in heavy localized grease accumulation in the collection system that account for approximately seven percent of the annual grease related sewage overflows, and 36 percent of the flooded structure mitigation costs related to the overflows.

This project is being completed to meet two critical objectives for CSD-1: 1) The cost to clean grease related sewage overflows in businesses and residences are increasing and CSD-1 is looking to optimize maintenance practices within available operating budgets. 2) CSD-1 is taking a proactive stance to be able to meet the new regulatory requirements related to the US EPA Sanitary Sewer Overflow (SSO) policy with the accompanying Capacity Management Operation and Maintenance (CMOM) guidelines. Meeting these objectives required establishing six goals that allowed the project team to define the field investigations, comparable industry practices, and the analysis and recommendations for the project. The goals of the project are to develop alternatives that mitigate grease impact, reduce operating costs, reduce blockages and overflows in the collection system, improve customer service, and work within the framework of the SSO and CMOM requirements.

This paper presents a summary of the key findings and recommendations that resulted from the project along with the recommendations to implement an active grease source control program. The project consists of collecting information on four existing isolated areas of the CSD-1 collection system that are chronic maintenance problems due to grease build-up. A survey of 21 agencies nationwide with grease handling programs was conducted, to establish a range of options for CSD-1 to consider for dealing with grease within their collection system. The results of the survey were used in conjunction with the findings from the TV inspection to develop alternatives for grease control within the CSD-1 collection system.

Document Type: Research Article


Publication date: 2001-01-01

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