Water Quality Awareness 101 25 | P a g e 15.1.2 Solutions Within each node of the HAZOP and within the final review, consider the following: Pest control: will there be a requirement, and is the design suitable to block out pests? Wildlife attraction: is the design a natural attraction for wildlife and will wildlife interaction lead to increased maintenance activities or risks to drinking water quality? Maintenance requirements: are the materials of construction suitable - will they need on-going maintenance and are they compatible with the asset/process and all of its by- products and inputs? Environment: will the surrounding environmental features impact on the design and cause maintenance and/or drinking water quality issues now, or in the future? Operational maintenance and servicing: does the design minimise the need for human intervention for ongoing maintenance/servicing into the future? Future growth and development: does the design take into account the future growth and development of the surrounding areas, and stakeholder requirements? 16. STORAGE TANKS Storage tanks come in many shapes, sizes, designs and uses. Each structure must be suitable for the safe storage of drinking water and the way people may interact with the storage, for operational, maintenance and indirect activities. 16.1.1 Issues  Fitting external cabinets and fixtures that compromise security and allow unauthorised access to occur  Damaged roof sheeting and vent mesh from the installation of cabling or piping  Gaps in roofs and platforms that could allow debris/vermin to enter tanks  Railings and aerials that attract birds to roost close to the tank hatch opening areas or above open sections of a water treatment facility  Roof and entry hatches or other openings that are not secured, raised or sealed against drainage and debris entry  Recesses that collect debris and are difficult to clean  Gutters that collect debris that could block and cause run off into water storages  Poor design of in-tank pipework, such as inlets, that allow sediment to be disturbed within the tank, or that allow short-circuiting to occur, which compromises disinfection levels (chlorine contact time)