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A S S O C I A T E S I N C <br /> This alternative would reduce the existing levels and volume of impacted groundwater over <br /> time by natural degradation, but the rate of reduction is not known. The possibility of <br /> migration of petroleum hydrocarbons in groundwater caused by nearby dewatering wells exists <br /> until construction activities have been completed. Following completion of construction <br /> activities, sewer or storm drains lines installed in the immediate vicinity of impacted water <br /> could potentially act as conduits. <br /> ' 0 Criterion 3: <br /> This alternative would not immediately remediate groundwater or any impacted soil to levels <br /> ' acceptable to regulatory agencies. Natural degradation of petroleum hydrocarbons would be <br /> expected to occur over time but it may take several years to reach acceptable levels. <br /> ' 0 Criterion 4: <br /> Additional capital investment for this alternative is related to the costs associated with the <br /> ' permitting, installation, monitoring and destruction of monitoring wells and report preparation <br /> costs. The cost of this alternative is estimated to be between$25,000 and $65,000. <br /> !� 0 Criterion 5: <br /> This alternative is not effective in minimizing the health-based risks in the short term. The <br /> ' possibility of exposure to humans by contamination releases through inhalation, ingestion or <br /> dermal exposure to impacted soil or groundwater is considerable during construction activities <br /> but minimal during well installation, monitoring and destruction activities. <br /> 0 Criterion 6: <br /> The long term effectiveness of this alternative is poor to fair. This alternative would reduce the <br /> toxicity and volume of the contaminants in the groundwater and soil by natural biodegradation, <br /> but the rate of reduction is not known. There is a possibility for health-based risks in the long <br /> term. Exposure of humans or the environment to impacted soil or groundwater can occur if <br /> additional excavation activities occur in the vicinity of the site or if the sewer and storm drain <br /> ' act as conduits and convey impacted groundwater off site. <br /> 0 Criterion 7: <br /> ' The passive remediation approach is the easy to implement. Well permits would be obtained <br /> from the appropriate agencies and the wells would be installed and monitored on a quarterly <br /> basis. Data would be evaluated on an on-going basis until concentrations warrant a request for <br /> closure. <br /> ' w:1822541sun"tdoc 8 <br />