This assignment is part of the DLC assignment Bring Down the Sky, and while it’s listed as a standalone assignment, you can’t really complete Bring Down the Sky without completing this. As you leave the first fusion torch facility, Simon will warn you about some “blasting caps”, which surround an upcoming facility. These blasting caps will prevent you from approaching with Mako, forcing you to disembark and advance on foot.
This second fusion torch facility can be found northeast of the first one, just east-of-center on the map. To get there, you can just follow the lowlands north and east from the first facility. When you see a line of beacons on the ground, you’ll know you’re in the right area - if the exhaust from the torch itself isn’t obvious enough.
Just like last time, several shielded Heavy Turrets surround the facility, but the beacons should give you pause. These indicate the presence of blasting caps, and you should keep the Mako a respectful distance away from them, lest you fancy an impromptu trip back into orbit. Avoid the beacons and gun down the turrets, then abandon the Mako and advance on the facility on foot. The beacons themselves aren’t the danger, of course, the blasting caps beyond them are, and you’ll recognize them by the rotating devices in the ground. Keep your distance and mind the “Proximity Detection” meter on the bottom right of the screen… and no, you can’t detonate them with gunfire.
Bypass the blasting caps and you’ll reach the facility, only to be greeted by some Batarian Troopers and Rocket Soldier near the entrance. Gun down the batarians and using the Blasting Cap Controls near the facility entrance to disarm the blasting caps. This will end the assignment.