Grounding calculations

[kookypedia]

Guys,
I have two soundings from field (perpendicular to each other) and each of them gives one soil model for designing grounding grid.
I designed my grid based on first Grid and made sure it works for the second soil model too. Do you think this is a good approach or I should combine the data from two soundings?

 

[HamburgerHelper]

I don't know what a sounding is but am I guessing you mean wenner measurement and they are 90 degrees to each other. I would just design the grounding grid conservatively.

 

[7anoter4]

If "sounding" means an investigation of mechanical properties of the ground subsurface [static or dynamic test] See-for instance:

http://web.mst.edu/~rogersda/umrcourses/ge441/CPT-Soundings.pdf

this test is not connected to grounding grid directly.
For grounding resistance test see[for instance]:
Earthing Techniques

http://www.lightningman.com.au/Earthing.pdf

 

[jghrist]

I think your approach is good. You can't always tell which reading is the most conservative, but I'd try the one with the higher resistivity in upper layers as the one on which to base the initial design.