Read the pattern
List affected and unaffected openings, order of use, water levels, sounds, odors, prior chemicals or clearing, known cleanouts, pipe material, and any street or neighboring pattern.
Decision terrace 23
Move from evidence to a bounded authorization
Hold the safety line
Stop adding water when it rises elsewhere. Do not mix drain products, open an unknown pressurized cap, or work around wastewater without suitable isolation, protective equipment, and cleanup.
Place the Seattle boundary
SPU distinguishes the privately maintained side sewer from the public sewer main. A provider still needs property records and field evidence before assigning the restriction to either segment.
Write the visit
Name the target branch, access point, cable or jetting method, reachable distance, surface protection, stopping condition, camera trigger, fixture reinstatement, and response if safe access fails.
Keep the closing evidence
Send controlled flow through the original route, watch connected openings, inspect access seals, and keep any camera file or debris description. Restored flow does not establish the long-term cause by itself.
Current public source