The upper subsoil may or may not have mottles. Seasonal water table is between 12 to 24 inches. Poorly drained soils typically have a blackish surface layer that is underlain by a gray subsoil that is mottled. These soils have a water table at or near the surface for a significant portion of the year. soil feature unique to some coarse textured soils is a dark reddish or yellow layer often referred to as a rust line. This feature can form within the soil through two contrasting processes which may or may not be the result of a high water table.
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Oil Maintanence. Resolution: Below is a list of the different oil types for the different refrigerants in our units. Always check the compressor manufactureâs recommendations for oil on any other type of cooling unit. R12 Use Mineral Oil or Alkyl Benzene Oil. R22 Use Mineral Oil, POE oil is acceptable.