Sanitary Sewer Cleaning and Televising

Background

Annually, the South Granville Water and Sewer Authority (SGWASA) performs sanitary sewer system maintenance that includes jet-cleaning and televising of the gravity sanitary sewer lines.  The SGWASA sanitary sewer system is comprised of 110 miles of gravity sewer pipe, 2,570 manholes, and 51 pump stations. The majority of the collection system's smaller diameter gravity mains are constructed of Vitrified Clay Pipe (VCP), Ployvinyl Chloride (PVC), and Ductile Iron Pipe (DIP). Larger diameter gravity mains are predominately Reinforced Concrete Pipe (RCP) or Ductile Iron Pipe (DIP).  SGWASA’s goal is to jet-clean and televise at least 10% of the total length of gravity sewer pipe annually.   

The sanitary sewer maintenance is accomplished with in-house staff as well as through contracted staff. Traditionally, SGWASA spends approximately $66,000 annually on contracted sanitary sewer jet-cleaning and televising.   

Why Jet-Clean and Inspect Sanitary Sewers?

Routine sanitary sewer cleaning is a vital component of maintaining the existing sewer system to its maximum effectiveness and capacity. According to the USEPA, “As sewer system networks age, the risk of deterioration, blockages, and collapses becomes a major concern. As a result, municipalities worldwide are taking proactive measures to improve performance levels of their sewer systems. Cleaning and inspecting sewer lines are essential to maintaining a properly functioning system; these activities further a community’s reinvestment into its wastewater infrastructure.”

The sanitary sewer cleaning and televising program helps SGWASA to evaluate pipes so that any necessary maintenance, repair or replacement can be scheduled to minimize unexpected problems and emergency repairs.

Jet-Clean & Televising Process

Sanitary Sewers are cleaned using high velocity jet equipment placed directly into the sewer through an upstream manhole. The extreme pressure of the water removes the dirt, sand, rocks and minor roots and pushes the debris to the downstream manhole.

Televising (TV) inspection is done with a camera that is placed directly into the sewer through a manhole. The camera can examine and televise the entire length of sewer between manholes.  The cleaning and television program allow SGWASA to evaluate the sewer condition and identify deteriorated segments of the sewer main that need repair or replacement.

Schedule

Sewer cleaning and TV inspection projects occur year-round.  The operation time of the projects varies from project to project; however, typical hours are from 8:00 AM to  4:00 PM weekdays.  

FY20-21 SGWASA Scheduled Sewer Cleaning and Televising – July/August 2020   (Click to view map of lines that are being cleaned and televised.)

SR&R Environmental is under contract to perform sanitary sewer jet-cleaning and televising for SGWASA.  SR&R is working under the direction of the SGWASA Utilities team to perform this work.  

Starting 7/13/20, SR&R will be performing work for the next 30+ days in the following areas:  

City of Creedmoor:

  • Crescent Dr.
  • South Elm St. (W. Church St. area south)
  • South Main St. (near Dogwood Dr.)
  • Dogwood Dr. Area

Town of Butner:

  • 6th St. (between West C. St. and West D. St., including sewer line easement to main line)
  • 7th St. (between West C. St. and West D. St., including sewer line easement to main line)
  • 8th St. (between West B. St. and West D. St.)
  • 21st St. (between East C St. and East D. St.)
  • 22nd St. (between East C St. and East D. St.)
  • 22nd St. (between East F St. and East E. St.)
  • 25th St. (between East F St. and East E. St.)
  • 26th St. (between East F St. and East E. St.)
  • 27th St. (between East F St. and East E. St.)
  • 33rd St. (between East E. St. and East D. St.)
  • East C St. (near 21st)
  • East E St. (32nd St. to 29th St.)
  • Sewer line in easement (between 21st St. and 22nd St.)
  • Sewer line in easement ( between 22nd St. and East F St.)