Last week, the 13- and 14-year-old girls spent a day planting a garden on a deck that overlooks the Merrimack River. Within 48 hours, they found their hard work had been hijacked - someone had ripped the flowers out of the boxes. No sign of them was left. Not cool. What is cool is Mayor James Fiorentini, who was "appalled" by the thoughtless act of vandalism and pledged to pay for new flowers. Now, despite their disappointment, the Scouts plan to return to the scene of the crime and plant another array of flowers. Fiorentini said his campaign committee will buy the replacement flowers and he intends to join Troop 61286 in planting them at the same place.