Water Quality Awareness 101 15 | P a g e  Use suitable bunding and containment to capture fuels/oils and chemicals during refuelling and servicing (e.g. use a drip tray)  Have suitable chemical recovery systems and equipment in place in the event of an emergency (e.g. spill kits)  When petrol, oil or chemical drums are not in use, ensure the lids are fastened when working on or around drinking water assets or storages (or remove from site if possible) 11. MAINTENANCE SERVICE PROVIDERS This section is relevant to the following activities:  Contractors or landscapers/gardeners engaged to maintain grounds or eradicate weeds in, on or around drinking water assets or water supply areas  Pest controllers engaged to work in, on or around drinking water assets or water supply areas  Persons with property adjoining water treatment or storage facilities, such as farmers, market gardeners etc. 11.1 WEEDS AND MAINTENANCE Controlling and removing noxious weeds and plants on or around drinking water assets is required under environmental regulations. It is also an important part of dam safety, as the root systems can undermine the structural integrity of a dam. Chemicals are often used to control outbreaks of weeds and these chemicals can be a source of contamination of drinking water. Once the product has passed the last barrier of the treatment process it is very difficult to rectify any chemical intrusion to the drinking water system, therefore creating a requirement for strict management procedures. 11.1.1 Issues  Weed spraying undertaken near or around a water course, raw water off- takes, water treatment plants, or drinking water storages where there is the possibility for run-off into a water supply  Wind-borne chemical residue