Black Mesa Inbound  LbNA # 58884

Placed DateJul 25 2011
LocationSan Ysidro, NM
Found By Children of the Forest
Last Found Apr 25 2014
Hike Distance?

In the game Half-Life, the fictional Black Mesa research facility in New Mexico is the setting for most of the action.
As far as I know, there is no real place called Black Mesa in New Mexico, though Los Alamos is built on a volcanic mesa of basalt.
I decided to plant this at White Mesa, which in turn takes its name from the white gypsum that resembles snow from a distance.

For this box, you should follow Wronghat's El Conquistador driving directions to the Perea Nature Trail.

Then solve the following code, the key to which is the list of Half Life chapters (omit Hazard Course as a chapter:

3.1 1.11 1.16 5.2 8.4
14.1 8.1 5.5
6.1 2.3 15.1