Consider the following statement regarding permeability of soils: 
1) Permeability of coarse grained soil is inversely proportional to the specific surface area at a given porosity. 
2) Direct measurement of permeability of a soil specimen at any stage of loading in oedometer test can be made only by fixed ring type oedometer. 
3) Permeability increases with decrease in temperature of water moving through the aquifier.
Which of the above statements are correct