Agenda Information Sheet
DEPARTMENT: Water Production
CM/ ACM: Mario Canizares ACM
Date: October 9, 2017
SUBJECT
Title
Receive a presentation of the "Electromagnetic Inspection and Visual Assessment Report" for the Lake Lewisville Water Treatment Plant 30 inch untreated water transmission pipeline inspection and condition assessment
Body
BACKGROUND
Pure Technologies U.S. Inc., was selected to assess the condition of the 30" untreated water transmission pipeline using the multi-sensor inspection vehicle with electromagnetics (EM) and high definition digital pan-tilt-zoom camera (CCTV) system marketed under the trade name PureRobotics. The tool used CCTV in addition to the electromagnetic sensors, Laser profiling, Lidar with 3D reporting capabilities for assessing the structural integrity of the pipeline. Pure Technologies started the inspection of the 8.62 mile long pipeline on February 21st, 2017 and completed the work on March 2nd, 2017 except a section of the pipe due to some equipment malfunction. They re-mobilized and completed the inspection of that section of the pipe on May 23rd, 2017.
The Lake Lewisville Water Treatment Plant, (LLWTP) currently represents approximately 60% of the City's water supply system. The LLWTP is located on Spencer Road and is supplied with untreated water from a pumping station located on the Hickory Creek arm of Lake Lewisville. The untreated water transmission pipeline system was built in phases with a 27 inch Bar Wrapped Pipe (BWP) pipeline constructed within a 30 foot wide water pipeline and electric power line easement in 1956-57 and a 30 inch (BWP) pipeline constructed with a Union Pacific Railroad right of way in 1975.
The 30 inch water line was installed in native soil instead of specified bedding material and revealed deteriorated condition in some pipe sections during the I-35E widening project in April, 2015. Due to the installation concern, deteriorated pipe sections and the competing use of the Rail/T...
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