A huge sinkhole has opened up right next to a West Virginia police department, disrupting traffic and requiring several schools to move their classes online.When the sinkhole first opened up in June, it was just 6 feet wide and about 30 feet deep, according to a news release from the West Virginia Department of Transportation.A construction contract for the structure will be open to bids soon and the project will likely cost the state around $5 million total, according to a Facebook post from West Virginia state Sen. Stephen Baldwin.Sinkholes typically form due to acidic rainwater that dissolves limestone or other soluble rock beneath the soil, according to previous CNN reporting.The eastern region of West Virginia, including Summers County, is made up of karst terrain, which is characterized by limestone or other soluble rocks and is prone to sinkholes, says the West Virginia Geological and Economic Survey."