You may also want to incorporate a vapor barrier between the brick and rigid foam. 

In addition, the ground is exposed with no vapor barriers over the dirt.

Some investors with rental will put in a plastic vapor barrier underneath the carpet between the padding to keep from seeping into the floors.

The foundations didn't have any dampproofing to stop any moisture vapors from entering. 

New vapor barrier in crawl space.

From environmental standpoint, u may want to collect groundwater samples along boundary of the property with the gas statiob to see if it has impacted groundwater as well as soil gas samples to see if there is potential for vapor intrusion.if groundwater not used, then principal environmental risk would be vapor intrusion which can be effectively managed with radon system and vapor barrier.Note that if the gas station is downgradient from your property (gwvflows towards gas station), vapor intrusion can still be a problem since vapors can migrate thru sewers, utilities and any conduits.

@Grant Schroeder You could also ask him to use a vaporizer if he insists on doing it, it is much more discreet and leaves little if any odor.

We take care of our animals on a high level though.On the sub floors if you have no vapor barrier under the carpet then likely it is seeping into sub floor.

Monthly Expenses = $2800 Per Month: Current Management Team = $1000.00Insurance = $224.00Real Estate Taxes = $92.00Fiber Optic High Speed Internet = $89.00Cable TV = $52.00Trash Dumpster = $55.00Sewer / Water = $186.00Natural Gas (average) = $142.00Electric = $327.00Housekeeping = $270.00Ongoing supplies = $230.00Maintenance = $133.00Total Renovation The renovation started in 2011 and was completed 2016 with entire complex being gutted to the studs, then completely rebuilt fully furnished inside and out to new standards, as follows: 26 gauge top of the line triple epoxy coated metal roof26 gauge top of the line triple epoxy coated awning and patio coverSingle hung gas filled energy efficient EZ clean vinyl tip-out windows4 new natural gas water heatersAll new plumbing throughout entire complex/buildingOnly #1 Grade Premium lumber was used throughout entire renovationQuality Price Pfister plumbing fixtures and lifetime parts180 feet of new 4 inch sewer line from the building to the street tapNew premium exterior fiberglass dimensional Colonial style entry door with new door jams, aluminum thresholds, all new lock sets and peep holesCustom picture framed windows with decorative edging and exterior door trim to matchCommercial toilets: all new PEX plumbing, shut off valves, bullets, supply lines, hose bibs, angle stopsNew attic and wall insulation with vapor barrierUpgraded electrical, HE lighting, new fixtures, switches, outlets, breakers, energy efficient lighting, vapor lights, rope lighting and HE flood lightsCustom artistic signage (3) built by Management TeamNew drywall, texture and highest quality Valspar paint throughoutAll exterior wood was hand primed and hand paintedNew vinyl fencing for corner lotPremium Quality pillow top mattressesNew hand textured walls (office), ceiling and covered entryNew concrete sidewalks, kitchens, baths, showers stalls, toilets, vanities, cabinents, counter tops, sinks, refrigerators, microwaves, deep freezers, dryers, A/C units, flat screen TVsAll work has been documents and permitted

Monthly Expenses = $2800 Per Month: Current Management Team = $1000.00Insurance = $224.00Real Estate Taxes = $92.00Fiber Optic High Speed Internet = $89.00Cable TV = $52.00Trash Dumpster = $55.00Sewer / Water = $186.00Natural Gas (average) = $142.00Electric = $327.00Housekeeping = $270.00Ongoing supplies = $230.00Maintenance = $133.00Total RenovationThe renovation started in 2011 and was completed 2016 with entire complex being gutted to the studs, then completely rebuilt fully furnished inside and out to new standards, as follows: 26 gauge top of the line triple epoxy coated metal roof26 gauge top of the line triple epoxy coated awning and patio coverSingle hung gas filled energy efficient EZ clean vinyl tip-out windows4 new natural gas water heatersAll new plumbing throughout entire complex/buildingOnly #1 Grade Premium lumber was used throughout entire renovationQuality Price Pfister plumbing fixtures and lifetime parts180 feet of new 4 inch sewer line from the building to the street tapNew premium exterior fiberglass dimensional Colonial style entry door with new door jams, aluminum thresholds, all new lock sets and peep holesCustom picture framed windows with decorative edging and exterior door trim to matchCommercial toilets: all new PEX plumbing, shut off valves, bullets, supply lines, hose bibs, angle stopsNew attic and wall insulation with vapor barrierUpgraded electrical, HE lighting, new fixtures, switches, outlets, breakers, energy efficient lighting, vapor lights, rope lighting and HE flood lightsCustom artistic signage (3) built by Management TeamNew drywall, texture and highest quality Valspar paint throughoutAll exterior wood was hand primed and hand paintedNew vinyl fencing for corner lotPremium Quality pillow top mattressesNew hand textured walls (office), ceiling and covered entryNew concrete sidewalks, kitchens, baths, showers stalls, toilets, vanities, cabinents, counter tops, sinks, refrigerators, microwaves, deep freezers, dryers, A/C units, flat screen TVsAll work has been documents and permitted