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Enter soil resistivity (expressed in ohm-cm.) of the backfill material in which the anodes will be buried. If the backfill is different from native material, soil resistivity of the backfill should be used. Strive to bury galvanic anodes in soil with low soil resistivities. Magnesium anodes are generally used in soils with resistivities less than 10,000 ohm-cm. Soil resistivity should be taken from previously gathered reliable data or should be determined in the field using The Soil Box Procedure, The Single Rod Procedure, or The Wenner Four Pin Method. As a rule of thumb, fertile soils, clay, and sandy loam have soil resistivities in the 0 to 5000 ohm-cm range while sand, gravel, and rocky materials have soil resistivities in the 5000 to 10,000 ohm-cm range.
NOTES: 1. Generally, copper piping does not require cathodic protection. 2.�If another metallic material such as copper is used for service piping, the pipe should be electrically isolated from the tank at the fill connection. 3. All underground steel pipe should be externally coated with a corrosion resistant material. 4. The service line should be electrically isolated at the house with an insulated fitting or union.