I live in Denver Colorado. Is there a problem putting an infiltrator type or standard leachbed in four feet deep or deeper. I have a lot of clay in the first three feet. My perk tests were just under 60.
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Scurvydog,
Welcome to BT. The last 2 houses I owned had septic systems. One had the infiltrator system, it was no more then 1ft. below the surface. This system cost a large amount. I think the infiltrator panels were $60, each & we used 55 of them.
A soils engineer would be the best person to answer your question. Tri county Health Dept will make you have your system stamped by an engineer before you can get your septic permit.
Edited 9/26/2003 6:31:23 PM ET by G80104
In Denver, you could have a problem if it is LESS than 4 feet. Consider frost depth and, ideally, leave the leach field area unplowed and allow it go back to bushes/groundcover. You will have less fozen ground that way. My leach field is at 11 feet and in partial forest cover so I'm pretty dang safe. But 11 feet under a plowed road is marginal up here.
Often the building or health department will have handouts on requirements, guidelines and typical installations.