cathodic protection with asphalt base type

[natthaphon11]

according to DEP 30.10.73.33 at
7.1.3 General installation requirements paragraph 2 they inform that "This specification shall not apply to tank configurations where the tank foundation
consists of concrete ........ . In these cases, cathodic protection
shall not be employed, but instead will utilize an above grade asphalt or bitumen/sand
pad in contact with the tank bottom to mitigate corrosion."

I can't understand what do they intend to tell me ...
what's a meaning between "asphalt base don't need to protect by cathodic protection" or "asphalt base can't be protected by cathodic protection"

So, asphalt base can use instead of using CP with oil sand base right ??

 

[IFRs]

It is futile to put cathodic anodes inside a concrete slab that the tank rests on. They are suggesting that between the concrete slab and the tank bottom you put a layer of sand or asphalt to help reduce corrosion. This is not to say that sand or asphalt provide cathodic protection, or that a tank bottom placed directly on concrete will corrode quickly.