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 5.1.1 Runoff Processes .......................................................................... 5-2
5.1.2 Influence of CDF Design and Operation on Runoff ..................... 5-3
5.1.3 Regulatory Considerations............................................................ 5-3
5.1.4 Mixing Zones................................................................................ 5-3
5.1.5 Data Requirements ....................................................................... 5-4
5.1.6 CDF Design for Runoff Control ................................................... 5-4
5.1.7 Overview of Evaluations for Runoff Discharges .......................... 5-5
5.2 Tier I - Initial Evaluation of Runoff ....................................................... 5-5
5.3 Tier II Water Quality Screen for Runoff ............................................. 5-7
5.3.1 Tier II - Runoff Water Quality Screen - Equilibrium
Partitioning...................................................................................... 5-7
5.3.2 Tier II - Runoff Water Quality Decision ....................................... 5-8
5.4 Tier III Runoff Water Quality and Toxicity Evaluations ..................... 5-9
5.4.1 Tier III - Runoff Simulation Approaches ...................................... 5-9
5.4.2 Tier III - Simplified Laboratory Runoff Procedure (SLRP) .......... 5-9
5.4.3 Tier III - Rainfall Simulator/Lysimeter System (RSLS).............. 5-10
5.4.4 RUNQUAL Computer Assisted Analysis of Runoff Quality ..... 5-11
5.4.5 Tier III - Runoff Water Quality Decision.................................... 5-12
5.4.6 Tier III - Runoff Toxicity Evaluation.......................................... 5-12
5.4.7 LAT-R Computer Assisted Runoff Toxicity Evaluation............. 5-13
5.4.8 Tier III - Runoff Toxicity Decision ............................................. 5-13
5.5 Tier IV Runoff Risk Assessment....................................................... 5-14
5.5.1 Tier IV Runoff Evaluation .......................................................... 5-14
5.5.2 Tier IV Runoff Decision ............................................................. 5-14
5.6 Runoff Management Actions ............................................................... 5-14
5.7 References and Bibliography ............................................................... 5-15
6--Leachate to Groundwater .............................................................................. 6-1
6.1 General Considerations .......................................................................... 6-1
6.1.1 Leachate and Contaminant Transport Considerations................... 6-2
6.1.2 Water Quality Standards for Leachate .......................................... 6-4
6.1.3 Consideration of Attenuation ........................................................ 6-5
6.1.4 Data Requirements ....................................................................... 6-5
6.1.5 Disposal Area Design ................................................................... 6-6
6.1.6 Summary of Tiered Evaluations for Leachate............................... 6-6
6.2 Tier I Leachate Evaluation ..................................................................... 6-8
6.3 Tier II Leachate Quality Evaluations...................................................... 6-8
6.3.1 Tier II - Leachate Quality Screen .................................................. 6-8
6.3.2 Tier II - Leachate Decision ........................................................... 6-9
6.4 Tier III - Leachate Quality Evaluations .................................................. 6-9
6.4.1 Tier III - Sequential Batch Leachate Test (SBLT) ...................... 6-11
6.4.2 Tier III - Pancake Column Leachate Testing (PCLT) ................. 6-12
6.4.3 Tier III - SBLT or PCLT Adsorption or Challenge Testing........ 6-12
6.4.4 Tier III - Groundwater Modeling ................................................ 6-13
6.4.5 Tier III Leachate Quality Decision.............................................. 6-15
6.5 Tier IV - Leachate Risk Assessment .................................................... 6-16
6.5.1 Evaluation ................................................................................... 6-16
6.5.2 Tier IV Leachate Decision .......................................................... 6-16
6.6 Leachate Management Actions ............................................................ 6-16
6.7 References and Bibliography ............................................................... 6-17
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