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' 6 Long term effectiveness <br /> 7 Implementability <br /> 8 Regulatory and Community acceptance <br /> 9 Impacts on water conservation <br /> Criterion Y: <br /> ' The excavation approaches provide similar human health and environmental concerns due to human <br /> exposure to diesel hydrocarbon compounds due to direct volatilization and contact with soils and dust <br /> Gwen the relatively low volatilization of diesel hydrocarbons significant health nsks are not considered <br /> significant Diesel impacted soil is estimated to be no greater than twenty feet below grade (47 feet <br /> above groundwater) and therefore the potential for impacting the shallow groundwater during the soil <br /> ' removal process is not significant <br /> r <br /> Criterion 2: <br /> Alternative 1 will result in reduction of toxicity, mobility, and volume of contaminants. Alternative <br /> 2 may reduce mobility but would not reduce toxicity or volume <br /> ' Criterion 3: <br /> Both approaches can be conducted within regulatory guidelines <br /> ' <br /> Criterion 4: <br /> The cost differences between the two excavation/treatment alternatives is dependent upon the <br /> concentrations of TPHD encountered in soils during the excavation It is recommended that excavated <br /> ' soils be assessed to determine the most cost effective form of treatment <br /> R-042992 TJ L 15 <br /> 1 <br />