Soil resistivity
Measured across the route and at depth, because resistivity drives both anode selection and how much current the system will need.
Establishing what is actually in the ground before anyone designs anything.

A design is only as good as the site data behind it. The initial survey establishes the conditions a cathodic protection system will have to work in: how corrosive the soil is, what else is buried nearby, and what the structure is already experiencing. Skipping this stage is the most common reason systems underperform.
Measured across the route and at depth, because resistivity drives both anode selection and how much current the system will need.
Coating quality, existing protection if any, and the electrical continuity of the structure itself.
Baseline readings taken before anything is installed, so the effect of the system can actually be demonstrated later.
Nearby pipelines, powerlines, rail and other buried metal that will interact with the system once it is energised.
Access, available power, land ownership and the things that turn a clean design into an unbuildable one.
Findings written up as the technical basis for design, with the assumptions stated rather than buried.
Location, structure type and any survey work already done is enough for us to say what the next step is.
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