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PRO6LEm ASSESSMENT REPoFrr 44800 West Frontage Road Manteca California 5.1 6 Incineration Incineration of hydrocarbon-bearing soil at the site would require excavation of soil, permitting, and either contracting for a temporary soil incineration unit on site or hauling the soil to an off-site incinerator facility Typically, these units consist of a combustion chamber and a vapor-treatment system Soil is introduced into the chamber and heated sufficiently to volatilize and destroy the hydrocarbons present Fumes generated by the process may be collected and treated by various means Typically, on-site units treat approximately 500 cubic yards of sod per day to "non-detectable" levels If the soil is I treated on site it may be feasible to reclaim the material as backfill for the excavation(s) Currently, there are a limited number of units permitted in the western United States that incinerate soil 5.1.7 Physical Containment The physical containment of contaminants in soil is accomplished either by the injection of stabilizing agents into the soil matrix or by excavating soil and adding a stabilizing, vitrifying, or encapsulating agent The success of physical containment methods mainly depends on soil matrix grain size Soil with a coarse-grained matrix has a relatively high permeability and low attraction between sod particles, thus enhancing the ability of stabilizing agents to completely penetrate the soil Soil with a fine-grained matrix has a relatively low permeability and higher attraction between soil particles, thus inhibiting the introduction of stabilizing agents and reducing the effectiveness of the stabilizing process The presence of groundwater in close proximity to a containment area complicates placement of stabilizing agents and the ability of the agents to set up at or below the soil/water interface Because physical containment does not remove or degrade waste material, long-term monitoring may be required This alternative is feasible for a wide range of organic and inorganic compounds 5.2 Groundwater The following sections discuss groundwater remediation alternatives The technical approach to groundwater remediation generally falls into two broad categories, ex-situ and in-situ alternatives An option that is also considered is no action and/or monitoring only Ex-situ groundwater remediation alternatives involve the design, installation, operation, and maintenance of a suitable groundwater extraction and water treatment system In-situ options include passive approaches to groundwater remediation or injection of various media into the subsurface (soil and/or groundwater) to enhance biodegradation 90-097A PAR �7