A small number of people will have a blood pressure at very high levels, above 240/120mmHg for example, and this can cause problems very quickly and it needs to be treated straight away. For a blood pressure chart of readings, click here.
Materials and installation for a stone retaining wall start around $25-$40 a square face foot and go up depending on materials, site conditions, and other factors. It costs $1,250-$2,000 or more for a wall 30 inches high and 20 feet long.
The total cost to have a concrete retaining wall installed will be a combination of material and labor prices. For a basic wall you can expect to pay between $30 and $40 per square foot. If you add a decorative finish, curves, steps, lighting or other upgrades, the cost will rise.