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Mountlake Terrace details data-driven sewer inspections, says targeted jetting saved time and water
Summary
Public works staff described a multi-year sewer inspection program using a Sewer Line Rapid Assessment Tool (SLRAT) to prioritize cleaning and repairs. Staff said targeted inspection and cleaning focused on problem areas reduced estimated cleaning costs and cut estimated lost water by millions of gallons compared with citywide blind jetting.
Mountlake Terrace public works officials on April 24 outlined results from a multi-year, data-driven inspection campaign for the city’s wastewater pipes and described next steps for repairs and targeted maintenance.
The city has used a Sewer Line Rapid Assessment Tool (SLRAT) to score pipe segments from 0 (worst) to 10 (best) and to prioritize cleaning and further inspection. Public Works Director Gary Shymek and maintenance staff presented an overview of about 3,249 SLRAT inspections covering roughly 144 miles of sewer and reported that 94% of measurements returned fair-to-good scores (7–10) while 6% were poor or blocked.
The SL R AT results show 761,460 linear feet inspected; staff identified roughly 91,513 feet (about 12% of the system) requiring cleaning based on scores of 4 and below. Staff…
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