Originally Posted by ninjadriver

Slough,

I think you are confusing two different things here. A 2nd ALT is required in two scenarios.

1) Marginal wx at the destination AND first alternate (marginal defined by company opspecs) (Both Airports considered)

2) EX 3585 used due to wx below minimums in conditional language at the destination AND/OR first alternate. (One or Both Airports considered)