The firewall that monitors traffic from the DMZ to the LAN is the second, or internal (dual-firewall)
In this kind of traffic, the second, or internal, firewall is known to be the one that gives room for traffic to move from the DMZ to the internal network.
Note that the dual-firewall approach is seen as a very secure way due to the fact that two devices have to be compromised before any kind of attacker can be able to gain access into the internal LAN.
When a DMZ is set up using dual firewalls, the web server is placed inside the DMZ and the private network is often placed behind the DMZ.
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