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' Feasibility Study Report <br /> 1140 W Hammer Gane,SfocAton, CA <br />' monitonng and maintenance <br />' Criterion 2 Compliance with ARARs <br /> This treatment alternative is commonly employed at sites with coarse-grained soils and, therefore, <br />' would generally meet ARARs <br /> Criterion 3 Long-term effectiveness <br /> The long term effectiveness of this alternative groundwater extraction is dependent upon the degree <br />' of removal of residual contamination Based upon the presence of soil and groundwater <br /> contamination within relatively fine-grained soils at the site, it is doubtful that all residual <br />' contamination could be removed through groundwater extraction Any residual contamination <br /> remaining after the system can no longer effectively remove contaminants would be reduced <br /> through natural bioremediation <br />� . Criterion 4Re_duction of toxicity, mobility, or volume through treatment <br /> Groundwater extraction generally will reduce the level of toxicity, mobility and volume of <br /> contaminants in the soil by slowing or stopping the migration of groundwater in the contaminated <br /> zone Based upon the presence of soil and groundwater contamination within relatively fine- <br /> grained soils at the site, it is doubtful that contaminants would be reduced to levels acceptable to <br /> regulatory agencies solely through this alternative Any residual contamination remaining after the <br />' system can no longer effectively remove contaminants would be reduced through natural <br /> bioremediation <br /> Criterion 5 Short-term effectiveness <br />' This alternative should result in demonstrably lower dissolved contaminant concentrations and act to <br /> retard plume migration fairly soon after the system is operating <br /> Criterion 6 Implementability <br /> This alternative has some minor problems with implementation due to the time involved in <br /> obtaining permits From the APCD, as well as City and County agencies Permitting could take as <br /> much as 1$4 days dependent upon response from the appropriate agencies <br /> G IUumIGROUNDZL\KNO\VM%HAM\RLPoitTSIrcnvihilityRcpoit dog <br /> I14 <br />