Installing systems on Soils with high ground water
Working on an interesting system this week.We did a site evaluation for subdivision on this property several years ago. This summer, the client asked us to design a system for a three bedroom modular unit they were going to move onto the property. Our notes indicated that there was redoximorphic features between five and eight feet in the area where we had previously done the test pits so we know we would have a choice of a raise sand mound or advanced treatment to media based laterals.
The client chose to install the modular about 1500 feet south of our original pits so we knew we would have to confirm the new site as being similair to the area of our original pits.
When we dropped by to check on the progress of the modular install we noticed that there was large depressions in some areas around the home from the transport dollies. This lead us to believe there was near surface ground water, which left the ground too soft to support the move.
We over-excavated the hole by about a foot and installed drainage rock in the over excavation. We than embedded drainage tile in the drainage rock and covered the stone with filter fabric. The drainage tile was than extended 150 feet to the East until it daylighted.
This gave us a permanent drain under the Norweco Singulair Advance Treatment Unit so no matter how wet the future is, out ATU should aways sit on a firm foundation.
• just because one area of the property has good soils for septic, don't assume it will be the same over the whole area. In this case, we had several different situations within 100 feet of each other. If we had not done our due diligence when the client relocated the home, we would have had a compromised system.
In this case, we could have simply have given up and said the client would have to install a holding tank and been done with it but that would not have been fair to the client.
The clients rely on our expertise and they deserve our best effort. I understand that not everyone will have the experience that we have obtained by working the industry for over forty years so if you are just getting started in the industry and you run into difficult situations, don't be afraid to reach out to some of your colleagues that have been around for a while. In southern Alberta, we are blessed with a number of professionals that are happy to lend an ear and give some advice.