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EFR Project Summaries
Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Atlanta, Georgia
EcoVac Services was contacted by a state trust fund contractor to initiate EFR® on an emergency response basis. High levels of gasoline vapors were detected in a sanitary sewer line near downtown Atlanta and approximately two city blocks were partially evacuated (including a nursing home) as a precautionary measure. EFR® was implemented at seven monitor wells, which resulted in the gasoline vapors being completely removed from the sanitary sewer within hours. Consequently, the 24-hour police and fire department surveillance was discontinued. Approximately 2,700 equivalent gallons of gasoline were recovered during the initial 47 hours of EFR® at a cost of approximately $17,173. A calculated total of 8,997 equivalent gallons of gasoline was removed from the site.
Client: Major Oil Company
Type of Facility: Refinery
Location: Puerto Rico
EcoVac Services was retained to conduct a feasibility study to assess the efficacy of free product removal by EFR®. This site is under U.S. EPA administrative order. Pilot testing was conducted at various locations throughout the refinery. The site did not appear to be an ideal candidate for EFR® due to a shallow water table and the lack of impervious surface cover. Offgas concentration >100,000 ppmv were prevalent during most of the pilot test period and >9,200 pounds of VOCs were removed over a 54-hour pilot testing period. On the basis of the feasibility study results, the client purchased a vacuum truck and an internal combustion engine (to treat offgas vapors) to implement EFR® as a corrective action measure at this site. Initial results indicate that product is being removed at a cost of approximately $0.96/gallon. EFR® has removed over 404,600 equivalent gallons of SPH.
Client: National Environmental Consulting Firm
Type of Facility: Service Station (Major Oil Company)
Location: Stone Mountain, Georgia
EcoVac Services was contacted regarding a significant subsurface release of gasoline. EcoVac Services arrived at the site within three hours and initially performed EFR® for a 30-hour period. Greater than 2,200 equivalent gallons of gasoline were recovered during this 30-hour period. EcoVac Services mobilized to the site four additional times during the following week and recovered an additional 3,900 equivalent gallons of gasoline.
Client: Environmental Consulting Firm
Type of Facility: Service Station Sites
Location: Marietta, Holly Springs and Conyers, Georgia
Eight 8-hour EFR® events were conducted at three active gas stations during a six week period. SPH, ranging in thickness from 0.17 to 3.31 feet was present in five monitor wells at the three sites. SPH was no longer present at any of the three sites following these EFR® events. The total cost of EFR® at the three sites was $24,323.
Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Knoxville, Tennessee
EcoVac Services was contacted to address an “emergency response” action, which was prompted by the threat of a third party lawsuit. EcoVac personnel mobilized to the site the same evening and conducted EFR® at three existing wells for a period of ten hours. Sampling was conducted 30 days later and dissolved-phase concentrations were reduced as much as 99%. Consequently, “monitoring only” status was requested since dissolved-phase concentrations were well below the site specific standard established for the site. Total cost for EFR® (inclusive of disposal) was only $3,916.
Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Memphis, Tennessee
Two EFR® events were performed at a site where an active groundwater “pump and treat” system had been operating for a period of years. Not only were the two events successful in removing SPH (as much as 0.08 feet), EFR® also significantly reduced benzene concentrations to <70 ppb and TPH-GRO concentrations from >100,000 ppb prior to EFR® to “closure monitoring” levels of <1,000 ppb. The client did not think that these closure limits were achievable at this site with any technology, given the challenging hydrogeologic conditions at the site. The client has since requested “monitoring only” and discontinued operation of the remediation system. Total cost for EFR® was only $5,074.
Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Jackson, Tennessee
EcoVac Services teamed with a small environmental consulting firm to reduce dissolved-phase petroleum hydrocarbon concentrations at a former auto repair shop/service station from greater than 20 ppm to below “monitoring only” criteria (i.e. <1 ppm). Two EFR® events were combined with oxygen release compounds (ORC) to achieve “monitoring only” criteria. The cost to implement EFR® was $7,208.
Client: Major Oil Company
Type of Facility: Service Station
Location: Memphis, Tennessee
Over 10 feet of SPH was discovered in a downgradient monitor well located at an active service station site. SPH was absent after four EFR® events were performed within 45 days at an approximate cost of $10,000.
Client: Environmental Consulting Firm
Type of Facility: Apartment Complex
Location: Washington, D.C.
A single EFR® event was conducted at a former fuel oil UST site where SPH was unsuccessfully removed by prior remedial efforts. The site was widely known within the environmental community as a result of the prior remedial failure. The site posed particular logistical challenges, such as performing EFR® on multiple levels of a parking garage. Offgas vapor treatment was implemented and SPH was removed from all four monitor wells following a single nine-hour EFR® event.
Client: Major Oil Company
Type of Facility: Former Service Station
Location: Fort Valley, Georgia
EcoVac Services was retained to conduct two EFR® events at a former UST site where a small amount of SPH existed. After two EFR® events not only was the SPH removed, but the dissolved phase concentrations were significantly reduced, to the extent that site closure was requested by the client. A total of approximately $5,000 was expended for EFR®.
