Water Quality Awareness 101 6 | P a g e ï‚· Sealants used in the construction, repair or maintenance of drinking water systems, that are not AS4020 approved ï‚· Materials used in construction of drinking water supply systems that are not compliant with the requirements of AS4020 ï‚· The incorrect chemical, or the incorrect concentration of a chemical, is used in the treatment of drinking water ï‚· Chemical lines failing or blocking, leading to either the under-dosing or overdosing of treatment chemicals 6.1.2 Solutions ï‚· Protect buffer zones around reservoirs and feeder streams, in order to minimise the chances of chemical runoff and subsequent contamination of raw water sources ï‚· Ensure refuelling is conducted in a bunded or non-spill area around water infrastructure and waterways ï‚· 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 ï‚· 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 ï‚· 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 ï‚· 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 ï‚· 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 ï‚· Fit locks on chemical fill points so delivery drivers cannot fill tanks unattended ï‚· Conduct laboratory tests on chemicals when they are delivered to determine correct strength i.e. sodium hypochlorite concentration percentage ï‚· Ensure that chemical delivery procedures are adequate to prevent any accidental release or poor clean up practices onsite ï‚· Ensure that all onsite stored chemicals are adequately bunded and that there is no leakage possible to the environment ï‚· Install anti-syphon valves in pipework between chemical storage containers and pumps ï‚· Fit lockable valves and trigger guns on pipework from storage containers