Abstract: The present invention is a method of controlling this gas migration through the subsurface strata about the landfill. The method comprises the step of installing an extraction well having a zone of influence in proximity to the perimeter of the landfill. Then, there is the step of horizontally fracturing hydraulically the subsurface strata outside the perimeter of the landfill but in proximity to the perimeter of the landfill such that the resulting horizontal fractures in the subsurface strata fluidically communicate with the landfill and the zone of influence of the extraction well. The present invention also pertains to a system for controlling gas migration in subsurface strata about a landfill. The system is comprised of an extraction well which is disposed in the landfill in proximity to the landfill's perimeter. The extraction well has a zone of influence which extends beyond the perimeter of the landfill.