[TowerTalk] Short Ground Rods??

[WarrenWolff@aol.com]

Greetings TTalkers,
 
I just heard from a friend who lives at Lake Havasu City
AZ  where I will be moving fairly soon.
 
We were having an exchange, and I mentioned the seven  (or
maybe more) 20 foot radials with 8 foot ground rods each  10
feet.  These are planned at the base of my 70 ft tower.  I  also
plan five similar radials at my SPG.
 
Well, my friend advises that none of his ground rods  went
deeper than 4 feet!  Rocks!!  I knew there were rocks,  but
not this bad.
 
I have been led to believe that all I need to do is saw them  off
at whatever depth they go and zap them with one shots.
 
Well, now, I am wondering if this means I should set  twice
as many ground rods at five foot intervals rather than10  ft?
 
Comments plus experience, please.
 
Regards,
Warren Wolff;
W5KKW; Extra Class;
ARRL Life  Member