Case Study of a site using Subsurface Metabolism Enhancement (SME, patent # 6,464,005)

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1 Case Study of a site using Subsurface Metabolism Enhancement (SME, patent # 6,464,005) Nowers Chevron, Facility ID# , Release Site ELIL; 105 South Main Street, Richfield, UT; Owner is John Nowers. A release was discovered from a faulty tank that had a misplaced strike plate, allowing the gauge stick to penetrate the bottom of the tank and release over 1,000 gallons of fuel into the soil and groundwater. Two earlier releases had been reported from this site by a previous owner. Corrective action with a pilot form of SME was approved by the Utah Division of Environmental Response and Remediation (DERR) and commenced May 8, Benzene in the groundwater on the neighboring property was of particular concern, since it was a motel, making this a particularly sensitive neighbor. Using only SME, over 8,300 pounds of total hydrocarbons were removed from the soil and groundwater. Benzene was removed from the groundwater in all down gradient locations by December 2002, about seven months after system start up. In specific, benzene in well MW4 dropped from 3.8 to <0.001 mg/l; in well MW5, Benzene dropped from 3 to <0.001 mg/l; in well MW9, Benzene dropped from 1.1 to <0.001 mg/l. Following the SME corrective action and a significant time to evaluate for contamination rebound, three wells were installed to verify the remaining concentration of hydrocarbons in the soil and groundwater. Of the eight groundwater confirmatory sample parameters in the three wells, the only analyte detected was gasoline range organics, measured at mg/l GRO in MW11 and 0.14 mg/l GRO in MW13. These values are significantly below the most stringent clean up target, which was set at 0.5 mg/l. For the three soil confirmatory samples, concentrations of contaminants were not detectable except in one boring, far below the clean up target of 30 mg/kg (MW11 with GRO at mg/kg). Drought was a particular difficulty on this site. The site could have closed much sooner, but the dropping groundwater elevations made some of the critical monitor wells obsolete. Replacement of the wells was not approved by DERR until late The No Further Action letter was issued March 1, Ellis Environmental, a division of The Vision Group, Inc.

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6 Nowers Chevron, Richfield, UT Fate of Soil Benzene Using SME 100 Log of Concentration, mg/kg < < < Pre treatment quality Post treatment quality Quantitative Chemical Comparison MW3 MW4 MW5 Ellis Environmental, a division of The Vision Group, Inc.

7 Nowers Chevron, Richfield, UT Fate of GW Benzene Using SME 10 Corrective Action Start up 5/8/2002 Log of Concentration, mg/l /12/02 06/19/02 09/13/02 12/04/02 Sample Dates MW4 MW5 MW9 Ellis Environmental, a division of The Vision Group, Inc.

8 Nowers Chevron, Richfield, UT HC Removal Using SME (pat.) 10 Hydrocarbon Removed, lbs. Thousands /29/02 09/13/02 06/20/03 03/25/04 06/19/02 12/04/02 09/11/03 08/17/04 07/16/02 03/10/03 12/18/03 Sample Date Cumulative Emissions HC Cumulative Metabolized HC

9 ~~ JON M. HUNTSMAN, JR. Governor ~II'" State of Utah,. GARY HERBERT Lieutenant Gllvernllr Department of Environmental Quality Dianne R. Nielson, Ph.D. Executive Director DIVISION OF ENVIRONMENTAL RESPONSE AND REMEDIATION Bmd T Johnson Director March I, 2005 ERRL-O John Nowers Nowers Chevron 105 South Main Street Richfield, Utah Re: No Further Action, Leaking Underground Storage Tank Release Nowers Chevron, located at 105 South Main Street, Richfield, Utah Facility Identification No , Release Site ELIL Dear Mr. Nowers The file for this release has been reviewed by the Division of Environmental Response and Remediation (DERR) project manager who has recommended that no further corrective action be taken at this time. This no further action applies only to the specific Release ELIL. This recommendation is based on the information contained in the file for this release. That information was supplied by you, your consultant or another representative. The information submitted indicates that any detectable petroleum contamination from this release is not a threat to human health or the environment according to Utah Admin. Code rule R In the future, if other evidence indicates a spread of contamination from this release which may cause a threat, further corrective action may be required. If you have any questions regarding this matter, please contact Robin Davis, the DERR project manager, at (801) BTJ/RVD/stt ~ Sincerely, ~\ Brad T Johnson, Executive Secretary (UST) Utah Solid and Hazardous Waste Control Board cc Robert Resendes, M.B.A., M.T., Director, Central Utah Public Health Department Roger Foisy, District Engineer, Utah Department of Environmental Quality Mark Ellis, Ellis Environmental Services, Inc. 168 North 1950 West. PO Box Salt Lake City, UT phone (801) fax (801) T.D.D. (80.1)