Final answer:
False. Standing water should not be left inside an excavated area due to risks of diseases, structural instability, and hindrance to planned activities.
Step-by-step explanation:
False. Standing water should not be left inside an excavated area because it poses several risks. Firstly, stagnant water can become a breeding ground for mosquitoes and other pests, increasing the risk of diseases such as malaria. Secondly, water could weaken the structural integrity of the excavation site, leading to potential collapse or erosion. Lastly, standing water may hinder construction or any other activities planned for the excavation site.