Laserfiche WebLink
. • Ex Situ Bioremediation The impacted soil is placed in a treatment cell <br /> Nutnent and moisture additions are typically added to the soil, and the soil is <br /> mixed to provide a continual oxygen supply <br /> Soil Vapor Extraction <br /> Soil vapor extraction (SVE) induces vapor flow through the vadose zone and volatilizes <br /> sorbed petroleum hydrocarbons The petroleum hydrocarbon vapors are extracted and <br /> treated This approach is well suited to coarse-grained, gasoline-impacted soil The site <br /> conditions in the vadose zone consist of silts and clays impacted by diesel <br /> Passive Bioventing <br /> Passive bioventing utilizes the pressure gradient between the atmosphere and vadose <br /> zone soil to introduce oxygen into the subsurface to stimulate biodegradation of <br /> petroleum-impacted soil The use of oxygen sensors allows monitoring of oxygen <br /> transmission and utilization for assessment of biodegradation processes Installation of a <br /> one-way valve at the wellhead restricts inflow when a positive gradient is present This <br /> approach has been used to remediate soil impacted by gasoline, diesel fuel,}et fuel, and <br /> crude oil This method represents a low-cost alternative to vadose zone remediation <br /> . Groundwater Extraction and Treatment <br /> Groundwater is extracted from a series of extraction wells located within the dissolved <br /> petroleum hydrocarbon plume, and the extracted water is pumped through a series of <br /> carbon vessels to remove the dissolved contaminant Treated water may be either <br /> reinfected or discharged to the sanitary sewer system, under the provisions of applicable <br /> permits <br /> High Temperature Thermal Desorption <br /> This alternative would be a modified approach to air sparging (AS)/SVE In this case, <br /> injection of heated air (6007 to 1,0007) volatilizes the contaminant in soil or <br /> groundwater Groundwater remediation by this method is in the pilot-scale stage Vapor <br /> extraction of the heated, contaminant-bearing airstream and treatment of the airstream <br /> are then conducted <br /> SALIN IPJ212794127941000 ICS-981cbell 8 Fmcon <br /> E-2 Rev 0,815198 <br />