A secondary or supporting stroke center may not meet all of the requirements of. a Primary Stroke Center (PSC) to deliver acute stroke treatment capability 24/7. but must meet all of the following requirements and submit a plan that.
The most common causes of subsidence are as follows: 1. Settlement of old mine workings, often at great depth, resulting in damage to structures on the surface. These may often be a long way from the cause of the damage. Access shafts are notoriously difficult to identify as mine operators rarely kept good records of these points. 2. Damage to subsoils caused by water flowing through them. This may be from naturally occurring ground water or leaking drains and water mains.
Sub-surface mines are dangerous for miners as tunnels can collapse and built-up gas can explode. They also create subsidence, meaning that the ground level lowers when the coal is removed. Surface mining, or strip-mining, causes erosion and water pollution and decreases biodiversity by reducing plant and animal habitats.