Attended a new build site in Northampton after a drainage run became blocked by what appeared to be resin, grout or similar construction material that had entered the system. The affected manhole and line were cleared, with the hardened material removed and collected as evidence. The system was then cleaned through to restore flow and prevent further backing up. Dealt with quickly and completed within the first hour, avoiding further disruption on site. Photos taken throughout to evidence the cause for the developer's records.