Water Quality Awareness 101 6 | P a g e  Sealants used in the construction, repair or maintenance of drinking water systems, that are not AS4020 approved  Materials used in construction of drinking water supply systems that are not compliant with the requirements of AS4020  The incorrect chemical, or the incorrect concentration of a chemical, is used in the treatment of drinking water  Chemical lines failing or blocking, leading to either the under-dosing or overdosing of treatment chemicals 6.1.2 Solutions  Protect buffer zones around reservoirs and feeder streams, in order to minimise the chances of chemical runoff and subsequent contamination of raw water sources  Ensure refuelling is conducted in a bunded or non-spill area around water infrastructure and waterways  Ensure plant and wheel washing activities are carried out in a designated area of hard standing, at least ten (10) metres from any watercourse or surface water drain  Ensure that all lubricants and sealants used for fittings that could potentially come in contact with treated drinking water are compliant with the requirements of AS4020  Take care working around chemical dosing or feed lines so you do not kink, restrict solution, or cause any blockage or interruption to the dosing system or feedlines  Audit chemical suppliers - where possible only use suppliers that have quality control and assurance systems in place, which specify and verify the specifications for chemicals in the contract  Ensure that chemical signage, labelling and on-site management practices are robust, so it is not possible to deliver the wrong type, grade of chemical or cross contaminate chemicals during delivery or dosing  Fit locks on chemical fill points so delivery drivers cannot fill tanks unattended  Conduct laboratory tests on chemicals when they are delivered to determine correct strength i.e. sodium hypochlorite concentration percentage  Ensure that chemical delivery procedures are adequate to prevent any accidental release or poor clean up practices onsite  Ensure that all onsite stored chemicals are adequately bunded and that there is no leakage possible to the environment  Install anti-syphon valves in pipework between chemical storage containers and pumps  Fit lockable valves and trigger guns on pipework from storage containers