yeah, it's 116 -- if you have an old Yankee reel tank that goes that wide (I have one!) you can do it that way, otherwise it's tray -- get it wet so it's easier to handle and then hold it so the reverse curl makes it hold a giant U shape and rock it back and forth in a tray or open tank for both dev and fix.

lacking any hard data, if it's b/w (safe assumption) try d-76, 1:1 for 10 minutes and pray.