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O Criterion 2 <br /> This alternative would reduce the existing levels and volume of impacted soil over time <br /> by natural degradation, but the rate of reduction is not known The possibility of <br /> migration of petroleum hydrocarbons in soil caused by surface water flushing <br /> ' contaminants into the groundwater exists in the short term <br /> O Criterion 3 <br /> ' This alternative would not immediately remediate soil to levels acceptable to regulatory <br /> agencies Natural degradation of residual hydrocarbons would occur over time <br /> ' o Criterion 4 <br /> ' Additional capital investment for this alternative is related to the costs associated with the <br /> permitting and destruction of existing wells at protect completion The cost of this <br /> alternative is estimated to be between $15,000 and $50,000 <br /> O Criterion 5 <br /> This alternative is effective in minimizing the health-based risks in the short term <br /> Exposure to humans by contamination releases to the air due to dust, or through ingestion <br /> or dermal exposure to impacted soil or groundwater is minimal during well destruction <br /> ' activities but is otherwise nonexistent <br /> ' O Criterion 6 <br /> The long term effectiveness of this alternative is poor This alternative would reduce the <br /> toxicity and volume of the contaminants in the soil by natural biodegradation, but the rate <br /> of reduction is not known There is a possibility for health-based risks in the long term <br /> Exposure of humans to impacted soil can occur if the site is ever excavated or existing <br /> structures are removed. The possibility of future groundwater impaction by residual <br /> ' gasoline hydrocarbons exists due to the high permeability of subsurface soil This could <br /> result in the degradation of a potential drinking water source <br /> 1500471REMRIS1CAP-0694 FNL 11 <br />