What were the two scavenge maps removed from left4dead 2?

Solution 1:

I've done a bit of digging and reviewing cut content from Left 4 Dead 2. I looked at other sources, but this is the most comprehensive: L4D2 Wikia: Cut Content.

I don't believe any Scavenge maps were cut before the release of the game.

You may be thinking of the The Coaster in Dark Carnival which was planned on being made a Survival map. From the wikia:

Originally, The Coaster was supposed to be a survival level, but it was cut it in the final version because players would be able to stand on the wood that holds the track up, with the Infected unable to reach or attack them. The survival level can be accessed by the use of glitches or by using a mod from L4Dmaps.com. Though the exploits have been fixed, the level still hasn't been returned.

From what I can research this is the only major cut map. All other maps received light-to-moderate transformations but no other level content was actually removed.