The Arlington-Pascal Stormwater Improvement Project in Saint Paul, Minnesota became operational in 2007 as the first installation of stormwater infiltration practices beneath city streets in Saint Paul. The system consists of 30 sumped catch basins and 16 sumped manholes upstream of eight underground infiltration trenches, designed to remove pollutants from stormwater runoff entering a local shallow lake. Pre-construction modeling estimated hydro-vac jetting of perforated pipes should occur every 12 years to ensure functionality over the project's 35-year lifespan. Monitoring resumed in 2023 and 2024, adding manual visual inspections and GoPro video collection of all eight trenches. Results showed infiltration rates were not statistically significantly different from 2011 to 2013 measurements when correcting for total rainfall, suggesting debris accumulated faster than predicted and more frequent early cleaning may have improved long-term performance. A pipe cleanout was conducted in 2025. The presentation will include preliminary analysis of 2026 monitoring data assessing cleanout effectiveness.