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' Feasibility Study Report <br /> 1140 W Hammer Lane, Stockton, CA <br /> have an effect similar to lime, but with a lower alkalinity The introduction of ORC is typically <br /> raccomplished by installing ORC socks in specific groundwater monitoring wells or but infecting ORC <br /> in slurry form directly into borings advanced through the contamination zone Groundwater would be <br />' monitored on a regular basis via the existing site wells to verify plume stability/reduction and monitor <br />' natural attenuation <br /> 6.4 Alternative 4—Natural Attenuation <br /> This alternative would involve no active remediation Naturally occurring rrucrobes wluch degrade <br />' petroleum hydrocarbon constituents over time would be utilized to graduaIIy reduce residual <br /> hydrocarbons in soil and groundwater Groundwater would be monitored on a regular basis via the <br />' existing site wells to verify plume stability and monitor natural attenuation Minimal capital outlay <br /> would be required for this option to be put into action <br /> 7.0 REMEDIATION ALTERNATIVES EVALUATION <br /> Each of the alternatives presented above were evaluated according, to the following criteria <br /> Threshold Criteria <br /> 1 Overall protection of human health and the environment <br /> 2 Compliance with ARARs <br /> Balancing Criteria <br /> 3 Long-term effectiveness and permanence <br />' 4 Reduction of toxicity, mobility, or volume through treatment <br /> 5 Short-term effectiveness <br /> 6 Implementability <br /> 7 Cost <br /> Modifying Criteria <br /> 8 State acceptance <br /> 9 Community acceptance <br /> 7.1 Alternative I - Groundwater Extraction and Treatment <br /> Criterion 1 Overall protection of human health and the environment <br /> This alternative has minimal health-based risks Petroleum hydrocarbons are removed from extracted <br /> groundwater prior to discharge minimizing the risk of exposure to humans The potential fire or <br /> G IDataNGROUNDMI(NOWLFS HA1M\kEMRTSlreaaihihtyRLport da. <br /> ll <br />