Vents from out of ground below basement slab?

[montana]

Inspected a 1999 house, 1-story over a finished walk-out basement (on a moderate slope), no significant elevation behind the house. Found three PVC pipes sticking up out of the ground at an angle, all close together on the downhill side of the house. These would appear to be pointing down below the basement slab; no ideal how deep they go. The soil in this area is generally stable. Radon is high in about 20% of the homes in the region, but this would obviously not be a standard radon mitigation method (and why 3 pipes?). Anyone want to venture a guess?

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[hausdok]

Cleanouts for the footing drain system, perhaps?

OT - OF!!!

M.

[ozofprev]

Drainage vents