An ‘alpha client’ contacted ReRem Equipment looking for options to address the LNAPL and VI issues in a VOC release he was managing. A 1000-gallon release of gasoline was impacting soil, groundwater and several adjacent structures. Drilling and investigation were on-going.
ReRem immediately deployed two (2) trailer-mounted SVE units to reduce the VI impacts on the structures, we also provided a pneumatic pumping system to depress the groundwater in the vicinity of the release. As the plume was delineated we moved one SVE trailer to the depression well to start VEGE recovery. During this three-week period VOC removal rates dropped by 70% and 400 gallons of LNAPL were recovered, product thickness was reduced to a ’sheen’.
Six weeks into this ER a HVE trailer was delivered and connected to the recovery well, the pneumatic pumping system and SVE trailers were removed. As dissolved-phase constituents attenuated the need for dual-phase recovery was deemed unproductive, so the HVE trailer was removed and a small SVE skid was used to assure the VI issues were resolved.
Though rapid response and flexible treatment the consultant was able to eliminate the VI vectors, recover the NAPL, reduce the concentration of the dissolved-phase plume and de-escalate to a small SVE system. This approach reduced the clean-up timeline, reduced the clients’ total costs, while satisfying the regulators and owners of the adjacent properties. Well done!