Your Private Septic System and the Soil Type on your Propertu Part One, there sure has been a great deal of study on just how will the soil of a property handles the waste and pathogens in the septic effuent. The EPA has been defining the Septic Wastewater Infiltration System or drainfield, by the limiting conditions of the site in a much more thorough mannet than just a simple perocoltion test, just how rapidly the soil of the property absorbs the water.
There sure does need to be adequarte depth to what is called the, limiting condition. Now this refers to either an impermeable layer that blocks the water flows to the soil beneath, or groundwater. The shallower the limiting condition, the more difficult its going to be to achieve the proper degree of treatment.

Tour Private Septic System and the Soil Type on your Property Part One, with the appropriate septic system, as little as 12 to 18 inches of separation is sufficient. But the distance is dependent is not only on the septic system feeding the drainfield, but also on the volume of liquid. For any Home Buyer or Home Owner that wants to able to converse knowledgealbly with a health official or an engineer, the following chart, shows four different categories of permeable soil depth, and the septic system types that are suggested for each.
Type one soil, on the left, is sure the worst condition shown on the diagram, is the shallowest to the limiting condition. But type four is the best, the deepest to the limiting condition.

I sure do hope you have enjoyed following this series about Your Private Septic System and the Soil Type on your Properrty!
I'll be bring more new and exciting blog series posts your way!
Links to the other three posts:
Part Two
Part Three
Part Four
You also may enjoy reading this post: A bit of Septic System History
Post 577, 3 September 2009
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Dale you are right on with this one. The type soil and depth are all very important factor when installing a septic system. It all comes down to these factors and what the design engineer comes up with for the most suitable system. I know David just had to attend a class the other day, I think it may have had to do with renewing his license, not for sure. He also has to attend continuing education classes just as we inspectors have to do. There are certainly many strigent guidelines folks have to abide by and that is a very good thing. Sure don't want any contamination problems.