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LFR Inc. <br /> the results are above the CHHSL, then the data will be evaluated using the Johnson and <br /> Ettinger human health assessment model. Site-specific soil property and groundwater <br /> concentration data will be included to assess whether the Hazardous Substance <br /> concentrations remaining in soil gas potentially pose a risk to either underlying <br /> groundwater or indoor air. Based on results from the Johnson and Ettinger model, a <br /> determination will be made to either terminate or continue SVETS operation. <br /> 3.2 Ozone Sparging <br /> The groundwater sparging system was installed to more rapidly remediate higher <br /> groundwater concentrations present in shallow groundwater within the Historical <br /> Source Area. Pre- and post-system shutdown data will be assessed to determine whether <br /> significant rebound occurred during the non-operational period. If all groundwater <br /> concentrations are below 100 pg/L and no significant rebound of Hazardous Substance <br /> concentrations in groundwater is apparent, a recommendation will be made to terminate <br /> operation of the sparge system. <br /> 4.0 REPORTING <br /> LFR will provide a final report documenting all data collection and methods. The <br /> report will include data summary tables and figures of both soil gas and groundwater. <br /> Based on the findings of the Phase II and Phase IV IRA evaluations, recommendations <br /> to terminate operations of either or both systems may be made. <br /> pimp 1 =-PhII IV_IRA-Aug09-06750.dm:deh page <br />