BpnJ,

Specifically for the Buried Copper Wire {Flexible} Ground Rod
without a Hard Rod Set-Up in the Sprinkler System Trenches :
With Trenches 12" to 18" Deep a light coating (a very thin 1/4"
layer that is 4"to 6" wide) of the Mixture of 1/2 "Bentonite"
(Clay Kitty litter); 1/3 Epson Salt; and 1/6 Copper Sulfate
would be adequate. { Enhance the Soil Conductivity -not-
Over-Kill the Lawn } Most of the time 'things-in-the-soil'
leach out and down and not up.

READ - Great Ground with Kitten Litter [ Bentonite ]
- by Guy Atkins on HCDX - August 10, 2000
http://www.hard-core-dx.com/nordicdx...bentonite.html
Bentonite is great for getting an excellent conductive ground.

"GROUND ROD SOIL MIXTURE"
My General Recommendation for Ground Rod Soil is to take
the Original Soil from the Ground Rod Hole or Trench and
create a "50 / 50 Mixture" of original Soil (50%) and the
other (50%) made up of these parts of 1/2 "Bentonite" (clay
kitty litter); 1/3 Epson Salt; and 1/6 Copper Sulfate works
well 'in-the-ground' around ground rod. Then Repeatly Water
this down and 'tamp-it-down' lightly over the next few days.

NOTE - This 'assumes' that you first use a Post Hole Digger
to dig a 6"-8" Hole Two to Four Feet Deep and then pound
the Ground Rod into the Hole. Once the Ground Rod is fully
driven Seven to Eight Feet Deep. Then Fill the Upper Post
Hole Section with this Ground Rod Soil Mixture.


hope this clarifies a few things - iane ~ RHF