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Figure 10 <br /> EXAMPLES OF ENVIRONMENTAL FATE CHARACTERISTICS WHICH <br /> INFLUENCE THE SELECTION OF ATTENUATION FACTORS <br /> Effect on <br /> As the following characteristics increase... Atten. Factor ' <br /> t i <br /> For ion of Groundr -- <br /> • Depth to Highest Ground Water (including capillary fringe) ✓ <br /> • Net Recharge (i.e., [rainfall] — [evaporation]) ✓ <br /> • Characteristics of the Vadose Zone: <br /> Permeability and Porosity ✓ <br /> Clay Content ✓ <br /> Organic Matter Content (for organics) ✓ <br /> Ion Exchange Capacity and pH (for inorganics) ✓ <br /> • Pollutant Characteristics: <br /> Polarity ✓ <br /> Ionic Strength (more positive) ✓ <br /> Volatility (potential for vapor transport) ✓ <br /> Viscosity ✓ <br /> Degradability 1 Biologic Activity ✓ <br /> Octanol/Water Partition Coefficient (Kow) ✓ <br /> • Other Constituents that Could Increase Mobility ✓ <br /> • Topography (Steepness of Terrain) ✓ <br /> • Total Pollutant Load (Mass Loading) ✓ <br /> • Volumetric Ground Water Flow Rate ✓ <br /> • Uncertainty of the Data and Assumptions ✓ <br /> For the Protection of Surface Waters-- l <br /> • Distance from Drainage Courses ✓ <br /> • Topography (Steepness of Terrain) ✓ <br /> • Pollutant Characteristics: <br /> Volatility (loss to atmosphere) ✓ <br /> Reactivity 1 Degradability ✓ <br /> Polarity ✓ <br /> Octanol/Water Partition Coefficient (Ko,) ✓ _ <br /> • Other Constituents That Could Increase Mobility ✓ <br /> k • Initial Dilution Upon Reaching Surface Waters ✓ <br /> (minimum surface water flow vs. maximum pollutant flow) - <br /> • Interconnection of Ground and Surface Waters ✓ <br /> • Total Pollutant Load (Mass Loading) ✓ <br /> • Uncertainty of the Data and Assumptions ✓ <br /> Page 30 Designated Level Methodology <br />