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MTB EIBTEX Case History <br /> ART In-well Air Stripping Technology <br /> Accelerated Remediation Technologies, LLC (ART) was secured by a major petroleum company to provide <br /> remediation technology at an MTBE site in southern California Contaminant concentrations had reached <br /> asymptotic levels and were significantly higher than defined action levels ART worked closely with the <br /> clients consultant, Orion Environmental, to assess the ART Technology's remediation potential and <br /> determine the proper, source area Installation location `The remediation accomplished by the ART <br /> Technology is expected to reduce site closure by years" <br /> Site Description: Former gas station — currently parking lot for high profile, Fortune 500 retail chain store <br /> Soil types consist of silty to clayey sand with sandy sift and sandy clay layers with average depth to <br /> groundwater at 25 feet below grade with an estimated aquifer permeability of 39 fuday <br /> Contaminant(s)of concern: MTBE, BTEX,TPH <br /> Site Remediation History: Dual phase SVE/pump and treat system Installed in 1998 to remediate soils and <br /> mitigate offsite plume migration However, the existing remediation system did not achieve reduction levels <br /> required for closure The ART Technology was installed as a retrofit in a single, 4-inch well utilizing existing <br /> SVE well, compressor, SVE and offgas treatment equipment to control costs Within a short period of time <br /> the ART Technology has achieved the following results <br /> ART Technology Remediation Results <br /> - Monitoring sampling 'rPHg Benzene Toluene benzene <br /> Xylenes MTBE <br /> Well Round (µg11) (µg11) (Ag/1) ii fi�ii) t1�9 } <br /> u"ywei <br /> $QAAweE Baseline 18,000 3,300 1,100 610 2,400 1,100 <br /> �urce <br /> Baseline 8,000 880 35 95 430 970 <br /> MW~l- 14 days 14,000 2,600 59 510 1,400 1,500 <br /> 25 downgmdient <br /> 33 days 1,800 440 29 51 47 460 <br /> 84 days 290 64 08 52 36 200 <br /> Summary: Within a short period of operation and despite frequent system disruptions "unrelated to <br /> the ART treatment" the ART Technology demonstration achieved dramatic contaminant reduction of <br /> all compounds Analytical results indicate significant vadose zone and groundwater cleanup is <br /> occurring. The average mass removal over the time period was approximately 12.5 Ibslday. In <br /> addition, the single, demonstration well is actively shrinking the plume. Additional wells are to be <br /> installed in the near future as a site-wide solution. <br /> The ART Technology combines in-situ air stripping, air sparging, soil vapor extraction, Dynamic Subsurface <br /> CirculationTm and enhanced bioremediation/oxidation in an innovative wellhead system The system is <br /> designed to remediate soils and groundwater, accommodate a 4-inch well and be very cost effective when <br /> compared with other, stand-alone technologies <br /> For more information about the ART Technology, contact ART <br /> Mark Davis (913)302.3399 or Marco Odah, Ph D , P.E. (913)438.4384 <br />