A 30-year-old Gardnerville man accused of abusing his two stepdaughters from October 2000 to March 2009 has pleaded not guilty to 12 counts of sexual assault on a child under 14 and lewdness with a child under 14.Jeffrey Volosin’s trial is set to start July 29 and last for eight days, excluding Tuesdays. He is accused of sexually assaulting or molesting the girls while he lived with them and their mother in a series of motels and apartments across Carson City.One of the victims said Volosin allegedly assaulted her from the time she was six years old until she was …