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Working To Restore Nature <br /> 8 Regulatory and community acceptance <br /> ' $ AIternative 1 - Passive Remediation <br /> O Criterion 1 <br /> ' The passive remediation alternative has no immediate health based risks. The <br /> impacted media exists at depths greater than 35 feet so the possibility for exposure <br /> ' to humans by volatilization, dust or dermal contact with impacted soil is minimal, <br /> with little or no fire or explosion hazard This shallow aquifer is currently classified <br /> as a drinking water source but is not generally used as such. <br /> ' O Criterion 2 <br /> This alternative would reduce the existing levels and volume of impacted soil and <br /> ' groundwater over time by natural degradation, but the rate of reduction is not <br /> known The possibility of migration of petroleum hydrocarbons in soil caused by <br /> surface water flushing contaminants into the groundwater exists in the short term <br /> unless an asphalt cap is installed across the site surface <br /> o Criterion 3: <br /> ' This alternative would not immediately remediate soil or groundwater to levels <br /> acceptable to regulatory agencies. <br /> O Criterion 4: <br /> ' This alternative would entail minimal cost associated with periodic monitoring. <br /> Additional measures may be required if subsurface contaminants migrate offsite or <br /> if regulatory agencies find this alternative unacceptable <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 <br /> 150MSUU3OMXCAP-0794 DRF 18 <br /> 1 <br />