I havenít run a dual-sanctioned event, but I was involved in developing the dual-sanction program and I have worked a lot of USMS and USA Swimming meets.
I donít see anything in the USA Swimming safe sport program that raises any concerns about adults and minors sharing a locker room. Does the LSC have any specific concerns about Masters, over and above concerns about other adults with access to lockers?
Personally, I see an adult presence in the locker rooms as a benefit to safe sport. It should reduce locker-room bullying and horseplay.
I suggest that any concerns be taken to Susan Woessner or Liz Hoendervoogt with USA-S. Both are extremely helpful and very willing to work with the clubs and LSCís to address all aspects of safe swimming.