I'm not sure the 10:00L to 10:00L is in line with the FAA rules. I believe that the FAA says if you get a 1 in 7 at your domicile, it must be in line with the duty day; ie. 1:30L to 1:30L. (words to that effect). I'd check the FAA regs and give the union a call (of course they won't get back to you until you make a second call/e-mail and then a week or so later for the response)