ARCHIVED REPORTS_XR0004048 - Laserfiche WebLink

Home Browse Search

' reohgicaI Techtda fxc. Page 3 Sinclair Trucking Feasibility Study Addendum Project No. 1030.3 April 26, 2004 ' Pump and treat remediation involves the pumping of contaminated groundwater from the subsurface and then treating the water with some type of technology. This site does not have MTBE or any of the other oxygenated fuel compounds so there is a wider selection of ' treatment possibilities available for this site. A variety of technologies have a proven track record of being effective at removing gasoline range petroleum hydrocarbons from water. ' Groundwater that has been treated can usually be easily discharged to the local wastewater treatment plant under permit. This site, however, does not have a nearby wastewater treatment system and therefore a pump and treat system is not feasible for the site with out a Waste Discharge Requirement or an NPDES permit. These two permits are not easy to ' obtain when the discharge is to adjoining property, not on the subject property. In addition, the site would have to be capped by asphalt to provide a vapor barrier to reduce ' short-circuiting of the vapor extraction to atmosphere. This would add considerable cost to the project and is looked on as cost usually not reimbursable by the Cleanup Fund. 2.2 lit Situ Remediation In situ remedial systems are processes that treat the groundwater in place rather then removing it to the surface and treating it above ground. The process can be slow. Tight soil ' conditions, underground utilities and structures over the plume contribute to making in situ remediation an unlikely candidate for this site. V1_ 2.2.1 In Situ Remediation Methods , 'V ` Advanced Oxidation Processes AOPs ems` Advanced oxidation processes (AOPs) are processes that create and use a highly reactive radical that effectively oxidize .MTBE and other organic compounds by chemical reaction. The most prominently used radical is the hydroxyl radical, designated as OH . The OH ion will capture a hydrogen atom from a molecule of contaminant, which then causes the contaminant molecule to become unstable and breakdown further. The end products of this ' breakdown process are reported to be bicarbonate, water and small amounts of mineral acid from any halogen, nitrogen or sulfur present in the groundwater. The AOPs have been very successful at treating gasoline compounds and the gasoline ' oxygenated fuel compounds. AOPs are promising because they quickly destroy the contaminant rather then augmenting the relatively slow biological processes at the site. Typically, AOPs use one or more of the following to create the hydroxyl radical: ' a Hydrogen peroxide a Ozone ' a Oxygen a Fenton's Reagent Oxygen Releasing Compounds ORCs ' Oxygen Release Compound (ORC) has been shown to aid in the -natural attenuation -V—_ degradation of petroleum hydrocarbons in the soil and groundwater. ORCs could be used at this site relatively quickly and the installation process would be relatively inexpensive ' compared to the AOPs.