Enhanced Bioremediation of Contaminated Groundwater - Balfour Road Site, Brentwood, CA; Fourth Plain Service Station Site, Vancouver, WA; Steve's Standard and Golden Belt 66 Site, Great Bend, KS

Site Name:

Balfour Road

Location:

- Brentwood, CA
- Vancouver, WA
- Great Bend, KS

Period of
Operation:

- Balfour Road: December 1995 to present (report covers the period through October 1997)
- Fourth Plain: July 1996 to present (report covers the period through October 1997)
- Steve's Standard: July 1996 to present (report covers the period through October 1997)

Cleanup
Type:

- Full-scale (Balfour Road and Fourth Plain)
- Demonstration (Steve's Standard)

Vendor:

Steve Koenigsberg, Craig Sandefur
Regenesis Bioremediation Products, Inc.
27130A Paseo Espada, Suite 1407
San Juan Capistrano, CA 92675
(714) 443-3136

Technology:
Enhanced Bioremediation of Groundwater using ORC®

- ORC® (oxygen release compound) is a proprietary formulation based on magnesium peroxide and is available from Regenesis
ORC® is applied to the groundwater using different methods and dosages (dosage based on several factors including the estimated mass of contaminant at the site and the specific properties of the aquifer)
- Details of the application method and dosage for each site are included in the report

Construction/Design:
Thomas Morin (Fourth Plain)
Environmental Partners Inc.
10940 NE 33rd Place, Suite 110
Bellevue, WA 98004
(206) 889-4747
Additional contacts in the report

Cleanup Authority:
State voluntary cleanup

State Contacts:
Joel Weiss
California Regional Water Quality Control Board
Central Valley Region
(916) 255-3077 (Balfour Road)

Carol Fleshes
Washington Department of Ecology
(206) 649-7000 (Fourth Plain)

Emily McGuire
Kansas Department of Health and Environment
(913) 296-7005 (Steve's Standard)

Contaminants:
Benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons (TPH)

Waste Source:
Various waste disposal practices, including leaks at service stations

Type/Quantity of Media Treated:
Groundwater - estimated 20,400 square feet for Fourth Plain; estimates were not provided for Balfour Road or Steve's Standard

Purpose/Significance of Application:
Evaluate the cost and performance of ORC® to remediate groundwater at three petroleum-contaminated sites

Regulatory Requirements/Cleanup Goals:
- Balfour Road - federal MCLs for groundwater.
- Fourth Plain - benzene - 0.005 mg/L, total BTEX - 0.095 mg/L and TPH -1.0 mg/L.
- Steve's Standard - no cleanup goals; demonstration project.

Results:
- Balfour Road and Fourth Plain sites - the cleanup goals had not been met at either the Balfour Road or Fourth Plain sites as of October 1997. The geometric mean concentration and mass of benzene, total BTEX, and TPH had been reduced by approximately 50 percent.
- Steve's Standard - over the first seven months of operation, the concentration and mass of benzene, total BTEX, and TPH had been reduced; however, over the next nine months, concentrations appeared to stabilize or rise slightly; a continuing source was identified at the site.

Cost Factors:
- Total cost -- $41,600 for Bafour Road; $37,300 for Fourth Plain; $96,000 for Steve's Standard.
- Treatment cost -- $33,500 for Bafour Road; $35,700 for Fourth Plain; $93,400 for Steve's Standard (two service stations located next to each other).

Description:
Contamination at each site resulted from leaks in underground petroleum storage tanks and supply pipelines at or near retail dispensing locations. Refined petroleum product was released to the subsurface soil and groundwater at each site for unknown periods of time, until being detected in the 1990's. The three sites were cleaned up under their respective state voluntary cleanup programs. Oversight was performed by the respective state agency without involvement of EPA. Enhanced bioremediation using ORC® was selected by the lead contractors for each of the sites because it was expected to reduce the mass of contaminants in the aquifer by more than 50 percent in only six months, thereby reducing risk to human health and the environment from exposure to contaminated groundwater, and because it required a smaller capital investment and lower operating expenses than alternative technologies such as pump and treat. Regenesis indicated that enhanced bioremediation using ORC® was not expected to treat the groundwater to the federal maximum contaminant levels (MCL), but that the treatment would reduce substantially the dissolved-phase mass of contaminants present in the aquifer, as well as reduce sources characterized as moderate smear zones.

Enhanced bioremediation was performed at the three sites, using application of ORC®. ORC® is a proprietary formulation based on magnesium peroxide and is available from Regenesis Bioremediation Products, Inc. According to Regenesis, the quantity of ORC® required for a site is based on several factors including the estimated mass of contaminant at the site (dissolved-phase concentration) and the specific properties of the aquifer such as porosity and thickness. Details on the specific applications of this technology at each of the three sites in included in the report. As of October 1997, the cleanup goals had not been met at either the Balfour Road or Fourth Plain sites; however the geometric mean concentration and mass of benzene, total BTEX, and TPH had been reduced by approximately 50 percent in the aquifers in only 6 months for roughly $50,000 per site. In addition, at the Steve's Standard site, the concentration and mass of benzene, total BTEX, and TPH had been reduced in portions of the aquifer. The report presents a detailed summary of the progress at each site and the plans for future activities at the sites.