Poor workmanship. These guys come and jack hammer a hole in your basement cement slab. They cut corners and leave the access box exposed to bare soil with a flimsy plastic box lid. This causes radon gas to leak into your home as well as ground water issues if you have a high water table. Things they don’t explain to you before doing the work. They are suppose to seal the access box. If you had a BWV installed by these clowns get a radon test for your families safety.