I am sure this could be better but this is working for me. I only have a couple roles setup so an if condition like this isn't much trouble.

foreach(var person in people){
    var roles = person.Value<IEnumerable<string>>("memberRoles");

    foreach(var role in roles){
        if(role == "Site Selection"){
            <h2>@person.Name</h2>
        }
    }

}

There is probably a more elegant way to to this, but I am at least getting the results I want:

var team = Umbraco.Content(Guid.Parse("123456789"))
.ChildrenOfType("teamMember")
.Where(x => x.IsVisible());
@foreach(var item in team) {
    foreach(var g in item.Value<IEnumerable<string>>("group")) {
        if( g == "foo" ) {
            <p>@item.Value("yourField")</p>
        }
    }            
}

If anyone has an improved response, I'd like to see it.

Try:

if(Model.Value<IEnumerable<string>>("type").Any(x => x == "foo")){
    //My conditional logic if value is "foo"
}

is working on a reply...