The range of 60-70 decibels sound pressure level is about as loud as normal conversation in 1 meter distance.
Flammable, Radioactive Sinkholes. Lesser known in the mainstream media, however, is frackingâs link to massive sinkholes appearing overnight and leaking radiation across the nation.
In some areas, sinkholes are used as storm. drains, and because they are a direct link with the underlying aqui-. fer systems it is important that their drainage areas be kept free of. contaminants. Conversely, when sinkholes become plugged, they. can cause flooding by capturing surface-water flow and can create.