For each Interceptor Segment, PPSI removed an average of 30” of debris using proprietary hydro jetting technology. Post-cleaning sonar inspections showed each segment to be a minimum of 98% clean by volume, with most segments approaching 100% clean by volume. Debris removed from the Interceptor and Siphon tubes included sand, grit, gravel, heavy rags, trash, logs, lumber, masonry and other bulk items. To restore capacity to the Siphon tubes, PPSI employed specialized dewatering techniques and confined space entry to remove bulk items as large as telephone poles. Work on the Siphons required careful coordination between outside engineering staff, subcontractors, the City of Baltimore and the State of Maryland (which runs the adjacent correctional facility.) Additional Project challenges included schedule concerns and restrictive work hours.