EOM performs Sewer System Evaluation Surveys (SSES) and Infiltration/Inflow (I/I) Analysis to systematically examine the structural state of sewer pipes and manholes. Inspection data provides clients with justification for hydraulic or mechanical cleanings, as well as possible rehabilitation of a particular section of the system to eliminate all positive signs of excessive I/I. Primary inspection and testing methods used include the following:
Focused services include:
A visual manhole inspection using surface access or physical entry; sometimes with the use of mirrors, gives an inexpensive indication of blockages, pipe size, materials, and condition. EOM’s trained technician’s code and condition-grade observed defects to NASSCO, MACP standards. The condition grades allow for consistent severity rating and serve as a benchmark for future assessments.
The primary internal inspection technique, CCTV uses a remotely operated television camera, laser, and sonar equipment to provide the exact location, features, and problems of pipe conditions such as line breaks, root intrusions, and blockages. CCTV is considered a best practice for I/I point source identification and structural condition assessment. EOM technicians map the complete interior 360-degree view of the pipeline, both above and below the waterline, and code defects in accordance with NASSCO, PACP standards.
In this most common routine source detection method of I/I identification, smoke is forced through main sewer lines and pipe laterals by a blower to expose defects in the system. Smoke travels through defects and can be observed rising to the ground surface, quickly identifying problems of cross-connection or illicit connections not known to exist. This is an ideal method when a rapid evaluation is necessary.
This rainfall-simulation technique is used after smoke testing to confirm suspected inflow connections. A non-toxic fluorescent dye is flooded into the pipe or test area to identify the location and magnitude of a defect, in order to confirm or eliminate its connection to the sanitary sewer.
This method integrates field data points with GIS platforms for a robust visual aid used to communicate the state of sewer system infrastructure. EOM field teams work together with in-house engineers to rate and map all sewer lines and manholes according to severity levels so that municipal officials can use real-time data to make informed decisions about where corrective actions should happen first.