Project Summary - Page 8

Client: Environmental Consulting Firm
Type of Facility: Truck Stop
Location: Sweetwater, Tennessee

A groundwater pump and treat system operated at a site for over three years and pumped over 1,200,000 gallons of groundwater. Approximately 6 and 23 equivalent gallons of benzene and TPH-GRO, respectively, were removed by pump and treat during this three year period. A sheen of separate phase product existed on the top of the water table, which existed at 5 to 7 feet below ground surface. A single 8 hour EFR® event was conducted at the site at a cost of $2,863, during which a calculated 33 equivalent gallons of gasoline (233 pounds of vapor phase petroleum hydrocarbons) were removed. The client reported that a >90% reduction in dissolved phase TPH-GRO (i.e. from 25-30 ppm to 2 ppm) and dissolved phase benzene (i.e. from 2,000-3,000 ppb to ~200 ppb) was achieved.

Client: Environmental Consulting Firm
Type of Facility: Service Station Site
Location: Little Rock, Arkansas

A single eight hour EFR® event was conducted at a petroleum UST site that had historically contained about 2 inches of free phase product. The product was removed after the single event, at a cost of less than $3,500, and the site is expected to be "closed out" after going to a site specific (dissolved phase) standard. (efwill)

Client: Environmental Consulting Firm
Type of Facility: Army National Guard Facility
Location: Greeneville, Tennessee

An armory had a monitor well, screened to the underlying shale bedrock, with over 1.5 feet of free phase diesel. Diesel was no longer present in the monitor well following four 8-hour EFR® extraction events, conducted at a cost of $12,690 (theta).

Client: Environmental Consulting Firm
Type of Facility: Trucking Facility
Location: Nashville, Tennessee

A small amount (0.04 feet) of separate phase diesel was present in a single monitor well under shallow water table conditions (i.e. 5 feet below surface). The product was removed following a single 8 hour EFR® event, conducted at an approximate cost of $2,936. (petrolight - us trucking)

Client: Independent Oil Company
Type of Facility: Service Station
Location: Richmond, Indiana

Seven EFR® events were performed at a site containing as much as 0.75 feet of free product in two wells, after which free product was removed from the site. The cost of the cleanup was $23,905.

Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Nashville, Tennessee

Two 8-hour EFR® events successfully removed 0.25 feet of product. A third extraction event was conducted to reduce the dissolved phase concentrations, which was successful and the site currently is in "monitoring only" phase. Total cost for EFR® was $10,115. (s28)

Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Memphis, Tennessee

Eleven 8-hour EFR® events were conducted at an active gasoline station during a three year period. Separate phase gasoline initially existed in six monitor wells at a thickness of as much as 2.5 feet. Free product was removed from the monitor wells at this site following nine EFR® events. A total of $23,911 was expended for the nine EFR® events. (T2279)

Client: Environmental Consulting Firm
Type of Facility: Electrical Contractor
Location: Memphis, Tennessee

Groundwater existed at a depth of 75 feet below surface at a site where 0.34 feet of free product existed. Two 8 hour events were conducted (at an approximate cost of $4,800) after which the free product was successfully removed. The site went to a site specific standard and is currently in the "monitoring only" phase prior to site closure. (ensafe-summer)

Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Memphis, Tennessee

EcoVac Services conducted two EFR® events at an active retail gasoline dispensing facility during a three month period. Free floating product existed in six monitor wells (ranging from a sheen to >1 feet). A sheen (i.e. <0.01 feet) existed in only two monitor wells following these two EFR® events.

Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Chattanooga, Tennessee

The EFR® process was suggested by state regulators to be implemented at an active service station. A maximum of 0.20 feet of free product existed in six monitor wells at this site. EFR® was performed four times (8 hour events) at a cost of $12,532 and free product was thereafter absent in the monitor wells. (aquaterra dupree)

Client: Environmental Consulting Firm
Type of Facility: Building Supply
Location: Memphis, Tennessee

Five EFR® events were conducted during a two year time period, which successfully removed minor amounts of gasoline/diesel free product from three monitor wells. Dissolved phase TPH was also reduced from 350 ppm to 57 ppm in the primary extraction well. A site specific (dissolved phase) standard is being sought by the client to transition the site into "monitoring only" status. (hess-owen)

Client: Environmental Consulting Firm
Type of Facility: Service Station
Location: Jackson, Tennessee

0.25 feet of gasoline was present in a single monitor well. The product was removed after a single EFR® event. Over 120 equivalent gallons of gasoline were removed and vacuum influence in excess of 10 inches of water and groundwater drawdown of 0.35 feet were recorded over 80 feet away from the extraction. Total cleanup cost was $2,921. (bull4)