How to set up line cast for two groundchecks?

I have two levels, high ground and low ground. I'm try to do linecast ground checks for both of these levels but I think I got the syntax wrong. I got this from a youtube vid and it works just fine for the low ground but I'm having trouble getting it to work for the High ground.

High Ground:

 void GroundCheck()
 {
     Debug.DrawLine (sightStart.position, sightEnd.position, Color.blue);
     grounded = Physics2D.Linecast (sightStart.position, sightEnd.position, 1 << LayerMask.NameToLayer("HighGround"));
 }

Low Ground:

 void GroundCheck()
 {
     Debug.DrawLine (sightStart.position, sightEnd.position, Color.red);
     grounded = Physics2D.Linecast (sightStart.position, sightEnd.position, 1 << LayerMask.NameToLayer("LowGround"));
 }