Just as construction on Highway 50 winds down for the season, the Tahoe Rim Trail Association also prepares to put the finishing touches on its own road project of sorts. It's taken more than 10 years and thousands of volunteer hours, but the Daggett Summit Trail System project near Kingsbury Grade is almost complete. Volunteers will come out for the final work day of the season this Saturday, and project leader Clay Grubb expects the whole system of trails to be finished by next July. That system includes about 15 miles of new trail that replaces a four-mile stretch of …