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ASPECT CONSULTING <br />iv FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 <br />8.6.6 Contingent Actions for Warehouse Subarea ..................................... 141 <br />8.6.7 Contingent Action for PUD Electrical Substation ............................... 143 <br />8.6.8 Estimated Cost for Cleanup Alternative and Contingent Actions ....... 144 <br />8.7 Analysis of the Cleanup Alternative ........................................................ 144 <br />8.7.1 MTCA Requirements for Cleanup Actions ........................................ 144 <br />8.8 Preferred Cleanup Alternative ................................................................ 150 <br />8 References ............................................................................................... 152 <br />9 Limitations ................................................................................................ 162 <br /> <br />List of Tables <br />2-1 Vertical Gradient Calculations for Log Pond Area <br />2-2 Fill Unit Hydraulic Conductivity Estimates from Tidal Study Data <br />2-3 Hydraulic Conductivity Estimates from Slug Tests in Log Pond Area <br />2-4 Estimates of Groundwater Velocity and Flux from Upland Area to East <br />Waterway <br /> <br />5-1 Groundwater Preliminary Cleanup Levels for Industrial Use Area <br />5-2 Groundwater Preliminary Cleanup Levels for Warehouse Subarea if <br />Redeveloped for Commercial Use <br />5-3 Soil Preliminary Cleanup Levels for Industrial Use Area <br />5-4 Soil Preliminary Cleanup Levels for Warehouse Subarea <br />5-5 Site-Specific Soil Organic Carbon Data <br />5-6 Air Preliminary Cleanup Levels and Screening Levels <br /> <br />6-1 Statistical Summary of Soil Quality Data Representing Current Site <br />Conditions <br />6-2 Statistical Summary of Groundwater Quality Data Representing Current <br />Site Conditions <br />6-3 Statistical Summary of Soil Data for Warehouse Subarea <br />6-4 Statistical Summary of Groundwater Data for Warehouse Subarea <br />6-5 Comparing Average Site Groundwater pH for Wet and Dry Seasons, <br />2016, 2017, and 2020 <br />6-6 Notes and Definitions for Section 6 Data Tables