ARCHIVED REPORTS_XR0005028 - Laserfiche WebLink

Home Browse Search

r1 I ' 17 February 2004 • AGE-NC Project No 96-0254 Page 9 of 10 6 2 1 Feasibility Testing ' An ozone spargingpilot test has not been performed at the site Data from soil samples collected at P P P the site indicate that silty sands are present in the water bearing zone impacted with MTBE The site stratigraphy has silty sands that typically possess hydraulic conductivity values that are favorable for air sparging and ozone injection via air-sparging Due to the readily higher vapor pressure of MTBE, ' low Henry's Law Constant and MTBE's higher aqueous solubility or the tendency to remain dissolved,the m-si�u,treatment should bean effective remedial alternative In other words,treatment should be conduct0in the ground water media(saturated soil/water) 6 2 2 Duration ' Sufficient data is not available to accurately predict the duration necessary to mitigate a site using in-situ oxidation via ozone sparging as the remedial alternative Mitigation duration is site specific, ' therefore a pilot study could be performed at the site before predictions can be made The reduction efficiency should be based on in-situ dissolved oxygen measurement,redox potential measurements (ORP)and ground water sampling with a MTBE-concentration trend analysis over the entire sparging ' • time frame ' 6 2 3 Cost Costs for installation of an ozone system typically ranges from $15,000 to $45,000, including the 1 installation of sparging wells and underground piping Based on an operational period of 12 to 24 months, costs for the entire project would likely be between $45,000 and $100,000 ' 7.0. RECOMMENDATIONS FOR REMEDIATION OF HYDROCARBON- IMPACTED GROUND WATER AGE believes that an in-situ oxidation remediation would be more effective in both cost and performance over a "pump and treat" method AGE recommends a six month ozone sparging operation at the site as depicted in Figure 6, to determine the effectiveness of In-situ oxidation via ozone sparging as the remedial alternative and if demonstrated as suitable,modify the scope of work ' to perform continual remediation utilizing the in-situ remedial method ' Advanced GeoEnvironmental,Enc.