What is the recommended action at the furthest point downstream?

The recommended action at the furthest point downstream is to wash vehicles. This practice is important primarily to prevent contamination of water sources that can occur from washing vehicles upstream, where runoff can carry pollutants or contaminants directly into the water supply. By washing vehicles at the furthest point downstream, you help minimize the risk of introducing harmful substances into the water that could affect the health of personnel, wildlife, and the surrounding environment.

Setting up camp, establishing latrines, or burning waste are activities that could lead to the introduction of waste or other pollutants into the water supply if conducted near the water source. Therefore, placing these activities upstream would not be advisable due to the potential for contamination. The emphasis is on ensuring environmental safety and preserving water quality, making washing vehicles at the furthest point downstream the most appropriate choice.