Radon Mitigation Before & After Photos

In this before and after we took an old aeration system, and replaced it with a Granulated Activated Carbon System (GAC).

CT Radon and Well Water Solutions was called out to a home in Norwalk CT to investigate a house that was built entirely on a dirt crawl space. Elevated radon levels of 10+ pCi/l were recorded in multiple living areas over the crawl space.

We went out to the home and found that the house was built entirely over exposed dirt crawl spaces.

CT Radon and Well Water Solutions was hired to mitigate the property. We installed a cross-laminated poly vapor barrier over the entire dirt floor footprint. We then installed suction pipes through the barrier and routed them to the home's exterior where we connected an in-line fan to the pipe network to create suction under the barrier and expel the soil gas outdoors above the roofline. Post-mitigation testing revealed results of < 1.0 pCi/l in all living areas.

Active Soil Depressurization (ASD) system installed to reduce elevated radon in air concentrations as low as possible. This home had a heavy bed of gravel and sub slab pipe which required the use of 4" PVC and a high volume radon mitigation fan. Because of the porous gravel bed under the slab, one suction point was all that was needed to successfully establish a negative sub slab pressure field.

This home had an old aeration system that was problematic. The system had reached a service life where multiple things were going wrong and repairs were going to be costly. The owner inquired about GAC (granular activated carbon) as an alternative. The non-mechanical, no operational noise aspect of GAC was appealing to them. We explained that while aeration was the "best available technology" (BAT) for waterborne radon removal, GAC can be an option depending on radon concentrations. After several confirmatory tests, we determined that GAC would be an applicable technology for this particular home.

We removed the old aeration system and installed the GAC tank with pre and post sediment filters (a feature many of our competitors don't do), along with an up flow acid neutralizer. The customer is thrilled with the results and has great quality water.

ASD Suction Point With Manometer Vacuum Gauge