Elanah needs to roll Wits + either Larceny or Investigation (whichever is higher). If she has Auspex active, she takes no penalty. If Auspex is not active, she has a -3 penalty.
Ishani finds a storm drain with a grate, but the heavy grate is quite tightly attached to the concrete of the curb. As far as Ishani can tell, there is no surveillance on the grate, but it's going to take awhile and some good effort to get it open. She's also noticed a couple manholes, but knows it will take some effort to open those as well (though probably less than tearing out the grate).