ARCHIVED REPORTS XR0008636 - Laserfiche WebLink

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i1 0 SOIL REMEDIATION ' 1 1 No Action This alternative to soil cleanup involves one of the following 1 ) the completion of a ' health risk assessment indicating hydrocarbons in soil do not pose a threat to public health and/or groundwater A formal "Health Risk Assessment," prepared by a team of certified industrial hygienists, hydrogeologists, and engineers, discusses site- specific hydrogeologic, contaminant, and site features relating to existing and future biological receptors and groundwater, 2) a negotiated plan to monitor soil and/or groundwater quality without an active remediation system, and 3) completion of a subsurface investigation that indicates hydrocarbons in soil are below required action levels All "no action" options require horizontal and vertical definition of hydrocarbons in soil and groundwater When the parameters have been defined, and no significant threat ' to the public health has been demonstrated, "no action" at a site may be considered a viable alternative 1 2 Soil Excavation (Ex-Situ Treatment) Excavation of soil involves not only the physical removal, but physical and chemical characterization, disposal, and/or treatment either on or off site In general, excavation is performed to accomplish at least one of two objectives The first objective is to remove hydrocarbons from the subsurface This is feasible when hydrocarbon-bearing soil has been determined to be shallow enough for conventional excavation, site restrictions allow for the excavation, and the vertical and horizontal extent of hydrocarbons has been defined The second objective for soil excavation ' is to remove the source of potential impact to groundwater thereby either reducing or eliminating future monitoring and/or remediation requirements Before excavation is selected as an alternative, treatment and disposal options for the removed material ' should be determined The following are some of the treatment/disposal options available ' 1 2.1 Landfilling/Off-Site Treatment and Disposal ' Generally, the easiest soil disposal option is a local landfill However, most landfills will not accept contaminated soil, or even soil from a site suspected of contamination (e g a service station) Others may accept soil containing relatively low hydrocarbon ' concentrations (e g TPH, as gasoline up to 100 ppm) These are sometimes known as Class III landfills Typical landfill costs are approximately $20 to $25 per ton, not ' including loading, hauling, profiling, and analytical fees