Water Quality Awareness 101 10 | P a g e 8.1.2 Solutions Keep sections of new pipe sealed at both ends until they are ready to be installed Protect the ends of the existing open water main pipes from ingress until the repair is completed Keep a positive flow of water out of the pipe (where possible) to prevent ingress Properly excavate around the pipe repair site to minimise the possible entry of soil/water into the opened pipe sections Maintain a de-watering system within excavations to minimise sediment contaminated water from entering into the pipe and consequently entering the water reticulation network Ensure sediment control plans are developed before undertaking excavation works near drinking water reservoirs or catchments Only use products for any installations or repairs in drinking water systems, that are compliant with the requirements of AS4020; this includes items such as lubrication, gaskets, spare parts etc. Ensure all tools, equipment and other items that may come into contact with drinking water are cleaned and disinfected properly Ensure proper disinfection by spraying all pipes and fittings with a concentrated sodium hypochlorite solution, especially if they have been used previously or have been kept in storage Proactively identify and assess possible sources of cross contamination during the planning of any repair - examples include failure of back flow devices, leaking valves etc. Implement disinfection and flushing procedures after all repairs Ensure that a disinfectant residual is present and adequate before returning any drinking water main back into service Mains flushing following a repair and a chlorine residual test being completed at nearest downstream hydrant to the repair