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i <br /> A S s O C 1 A T E S ! N C <br /> ' 4 Criterion 7: <br /> This alternative would be easy to implement since impacted soil has been excavated. The <br /> excavation is currently open so groundwater is accessible for extraction and quickly recharges <br /> ' into the pit. <br /> ' 4 Criterion 8: <br /> Since construction activities are already occurring in the vicinity of the site, the additional <br /> impact on the community would be very minor and not disruptive to the businesses located on <br /> ' the site and nearby. Regulatory agencies would be more likely to approve this alternative <br /> because of the short term effectiveness of the project. <br /> ' 9.0 PROPOSED ALTERNATIVE FOR REMEDIATION <br /> ' Based on the soil and groundwater data compiled and included in this summary report, ATC <br /> recommends implementing the second alternative, groundwater extraction and soil excavation. <br /> Upon regulatory concurrence, ATC would like to immediately implement this alternative in <br /> accordance with the workplan addendum. <br /> ' Construction of the extension of D'Arcy Parkway has been suspended since March 20, 1998. In <br /> an effort to avoid further delays, ATC recommends continuing construction with continuous field <br /> monitoring of soil and groundwater conditions. Impacted groundwater that is encountered will be <br /> ' extracted from the open excavation and pumped to a temporary storage tank on site until it can be <br /> manifested and transported off site to an approved recycling facility. Resumption of construction <br /> ' by DSS Construction will begin as soon as possible. Construction activities in areas where <br /> exposure to impacted soil and/or groundwater is possible will be conducted by appropriately <br /> trained personnel. <br /> 1 i <br /> 10.0 WORKPLAN ADDENDUM <br /> ' The following is an addendum to ATC's March 30, 1998 Workplan for Site Investig alias and <br /> Remediation for additional impacted soil and/or groundwater that is encountered during <br /> ' construction activities. The proposed scope of work, in brief, includes field monitoring during <br /> construction activities, excavating impacted soil and stockpiling soil on site, extracting impacted <br /> groundwater into a temporary storage tank, disposing of impacted soil and/or groundwater off <br /> site, collecting confirmation samples, and providing a letter report containing a summary and <br /> results. <br /> w:182254�suamrpt,doc 10 <br />