Septic tank
While a properly maintained and located septic tank does not pose any more environmental problems than centralized municipal sewage treatment, certain problems can arise with septic tanks in unsuitable locations. Since septic systems require large drainfields, they are not suitable for densely built areas.
South Hook LNG terminal
The terminal is built to store and re-gasify liquefied natural gas imported from the Qatargas 2 LNG plant in Qatar. in the five storage tanks located onsite. The large tanks are each 94 metres in diameter and 31 metres high, rising another 12 metres to the top. This makes a tank's volume roughly equivalent to that of Albert Hall.
The regasified natural gas is to be fed through the South Wales Gas Pipeline to the national gas network at Tirley, Gloucestershire.