We have achieved Radon mitigation, according to the EPA guidelines. Last night the first readings showed up (it takes the Radon detector about 2 days to come up with a fresh reading, then it starts a rolling average). It was 2.0. I then plugged a rather substantial hole around one of the pipes coming up thru the slab, and this morning the measurement had dropped to 1.7. Since our target was 4 or less, we have done it! However, the hole-plugging job I did was a temporary fix (I jammed plastic food wrap between the pipe & concrete). I think I can improve things a bit more by using something a little more permanent, like mortar. Thing is, mortar can crack, so I may have to come in later and caulk it. We shall see....
We may try using some "smoke in a can" to find more leaks, now that we have a decent pressure differential under the slab (or maybe light a few incense sticks), but now I feel more comfortable working in the basement. We will start doing things like putting in storage shelves, work benches and experimenting with concrete stains.
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