Cops searching for a teen who vanished 10 years ago are excavating a nearby house after a radar detected “anomalies” underground, authorities said this week. The major dig at a house in South Elgin, Illinois, started early Thursday — exactly 10 years and a day after Kianna Galvin, then 17, was last seen, having told her sister she was heading to a park on Mother’s Day. “The excavation is being conducted after investigators scanned the property with ground-penetrating radar,” the Kane County State’s Attorney’s Office announced of the property just a few blocks from where Galvin lived. Kianna Galvin vanished when she was 17 in May 2016 and hasn’t been seen since. Family Handout “The GPR scan revealed anomalies beneath the surface that detectives determined warranted further investigation,” the statement said, without elaborating on exactly what was seen. Tents were erected at the back of the home and cops were seen walking out with evidence, WLS reported.…