Laserfiche WebLink
' Off-Site Soil Treatment <br /> I Off-site soil treatment would require excavation of impacted soils and ample space for transport <br /> trucks to maneuver around the facility As discussed under the Excavation Option above, further <br /> excavation of the site is not feasible due to the depth of the impacted soils and the lack of space <br />' on-site for utilizing heavy equipment during excavation and loading of transport trucks <br /> Landfilling <br /> Landfilling would require excavation of impacted soils and ample space for transport trucks to <br /> maneuver around the facility As discussed under the Excavation Option above, further <br /> excavation of the site is not feasible due to the depth of the impacted soils and the lack of space <br /> for utilizing heavy equipment during excavation and loading of transport trucks <br /> ISoil Venting <br /> Soil venting is used to remediate unsaturated zone soil A vacuum is applied to the soil to induce <br />' the controlled flow of air and remove volatile compounds from the soil Treatment of the off-gas <br /> is usually required <br />' Soil vapor extraction would be a viable technology for treatment of vadose zone soils at the site <br /> However,use of this technology alone would not meet the requirements for this site which <br /> Iinclude soil and groundwater remediation <br /> Groundwater Extraction and Treatment <br /> Groundwater extraction and treatment is an established technology that is widely used for <br /> containment and remediation of impacted groundwater Groundwater is withdrawn from one or <br /> I more locations using wells or trenches at rates that depress the water table forming a cone of <br /> depression in the potentiometric surface Wells are spaced such that the cone of depression of <br /> each well overlaps those from adjacent wells The combined effect of the groundwater <br /> extraction system is to intercept and capture all impacted groundwater Constituents are drawn <br /> to the wells and recovered for treatment Treatment systems can consist of air strippers, <br /> activated carbon, ultra violet oxidation, or reverse osmosis The treated water must be re- <br /> injected or permitted for disposal in a publicly-owned treatment works (POTW) system <br /> Groundwater extraction and treatment alone is generally not effective in attaining the State <br /> health based clean up levels In general, dissolved-phase concentrations at most sites treated <br /> solely by pump and treat technology tend to reach asymptotic levels above the health based clean <br /> up levels Continued use of this technology past this point may not be economically feasible <br /> The Site and adjacent facilities use septic systems for wastewater treatment and no POTW <br /> systems are located in the immediate area of the Site Disposal of the treated water would <br /> probably require an NPDES permit, if allowed, for discharge to the local diverting canal In <br /> addition, use of this technology alone would not meet the requirements for this site which <br /> includes soil and groundwater remediation <br /> gf.GUL,g j, <br /> 0 <br /> LICKS~ <br />