But what about cassidy, sulik and the EC squadren to name a few?

Cassidy and Sulik: Can't say, no documentation exists. To be honest, I'll probably leave their fates open, since I don't want to pigeonhole two of the most favorite NPC allies from Fallout 2. I kind of hope that Cassidy eventually got his heart meds, though. At last word, Sulik returned to the primitive tribe for a few moons (months) after breaking paths with the Chosen One, then headed east in search of his sister. Cassidy went on to search for Texas, breaking south through NCR and past Dayglow.

24. I found in master.dat picture, COLUSA, it was one more special encounter like EPA, Primitive Tribe and Abbe wchich BIS didn't have time to add it to the game?

Colusa was the old name for "Navarro," so it wasn't another location, just a pre-existing location that got a name and location change. According to one of the lead designers, Matt Norton:

"I remember that once we put all of the locations on the world map that we moved some of them around a bit to create a more even spacing of adventure locations. I don't remember if we moved the enclave's mainland base for this reason, but it's possible."

That's what I recall, too, and considering how much dead space there was along the middle of the coast without the Primitive Tribe, that seems to support it. The real Colusa is much farther east and a little south of Navarro.

1f. Bible is updated again and its been a while since I've sent those qustions.... (answer, please) O, and one new question Is EPA and the other locations that weren't added to FO2 in master.dat or somewhere are finshed (Because you can replace one of the existing towns with ex. EPA, but I don't haven't got time to check this) ?

No - they were never finished. I posted the original design for EPA, below (much, much farther below), if you want to see it. There's not one for the Abbey or the Primitive Village that I can find.

First of all, the Sierra Army Depot was intended to be a bonus location for the game, just a place to adventure that wasn't tied to the main plot (kind of like the EPA, Abbey, and the Primitive Village were supposed to be), except it made it in (as did Modoc, New Reno, and to an extent, the Military Base, which, while it helps support the plot, isn't critical path).

Everybody's
mentioning the EPA, the Abbey and the Primitive Tribe(Village). Is there any possibility of these additional locations ever being released or a crack to unpack them? The data of this locations is included into the Master.dat, if I'm not mistaken. So there must be a way to reveal them and make them playable, right? I guess you know how it is valuable for the fans.

There wasn't ever anything designed for these locations except for the 5-6 pages of the EPA summary which I've included below - the locations don't actually exist in a data file anywhere in a playable state or even a "50% finished" state. It's doubtful we'll ever make them or release them to the public.
Here's a common question I get; it's from Evan Lally.