The new emergency room at Henry Mayo Newhall Hospital in Valencia is on track to open around Thanksgiving, hospital officials said. The $14.1 million facility upgrade adds 18 beds, nurses’ station, medication room and paramedic base station to the facility. The expansion totals 9,000 square feet. An additional $6.8 million will be spent improving the existing emergency room, constructed in 1975 and expanded a decade later.