An ultramarathoner is on the brink of an epic running feat in Essex County. Chris Jaworski of Bloomfield said he has run every street in all but one of Essex County’s 22 municipalities and is currently making his way through Irvington, where he grew up and attended high school. That’s 5,723 streets and 1,626 miles in the first 21 municipalities, concluding with 256 streets and 65 miles in Irvington, according to his records. Jaworski, 66, is planning to conclude his county-wide run July 7 on 21st Street in Irvington, near his childhood home. His effort dates to 2013 but really ramped up during…