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R10/71-51-1C <br /> be safety hazards for system operator and facility personnel and negative impact on the <br /> environment for all three options Failure of Options 7A and 7D could negatively impact <br /> the soil and groundwater Failure of Option 7B could negatively impact the air <br /> Environmental Impact - Failure of any of the three options could negatively impact the <br /> environment as discussed above All three options are expected to positively impact the <br /> groundwater quality at the site However, conducting extraction without careful control <br /> of the other surrounding sources of groundwater contamination (e g , Stockton Yard on <br /> the opposite side of B street) could draw into the site the contamination plume from those <br /> external sources and prolong the treatment time No significant negative effects of any <br /> of the three options are expected on the following land use, biology, or archeological and <br /> 1 historic sites <br /> 7 6 Selected,Remedial Action Option <br /> Based on the detailed study above, it appears that the best remedial action to implement <br /> is a combination of the following two options <br /> o In Situ Containment (Option 2) to address primarily the soil contamination <br /> issue and reduce contaminant infiltration into the groundwater And <br /> o Pump and Treat with Air Stripping to remove/reduce groundwater <br /> 1 contamination <br /> 1 <br /> 1 <br /> 45 <br /> 1 <br />