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.
Several types of sub-surface mining, and specifically methods which intentionally cause the extracted void to collapse (such as pillar extraction, longwall mining and any metalliferous mining method which uses caving such as block caving or sub-level caving) will result in surface subsidence.