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Recommendations of the On -Site Wastewater Treatment Systems Nitrogen Reduction Technology Expert Review Panel February 2014 Table 3-4. Loading Rates for Container Tests............................................................................................ 59 Table 3-5. TN Reduction for Column Studies............................................................................................ 60 Table 3-6. TN Reduction by Effluent Type................................................................................................ 60 Table 3-7. Site and System Characteristics................................................................................................. 61 Table 3-8. Nitrogen Species Concentrations versus Horizontal Distance from Mound ............................. 69 Table 3-9. TN Removal for Soil -Based Treatment Systems....................................................................... 70 Table D-1. Analysis of Soil Texture by County....................................................................................... 110 Figures Figure 2-1. Summary of Baseline Recommendations................................................................................. 20 Figure 2-3. Schematic of System with BMPs............................................................................................. 21 Figure 2-4. Drawing of System with Ex Situ BMP..................................................................................... 22 Figure 2-5. Edge-of-Drainfield Schematic Illustration............................................................................... 22 Figure 3-1. Typical Continuous Flow, Suspended Growth Aerobic Treatment Unit ................................. 32 Figure 3-2. Fixed -Film System using Peat Moss as a Treatment Medium ................................................. 33 Figure 3-3. Intermittent Sand Filter Cross-Section..................................................................................... 36 Figure 3-4. Vegetated Submerged Bed Schematic..................................................................................... 40 Figure 3-5. Recirculating Media Filter Schematic...................................................................................... 45 Figure 3-6. Example Two -Compartment Tank Conversion Profile............................................................ 49 Figure 3-7. Example Three -Compartment Tank Conversion Profile.......................................................... 50 Figure 3-8. Example Plastic Tank Conversion Profile................................................................................ 51 Figure 3-9. Plastic Tank Cutaway Photographs.......................................................................................... 51 Figure 3-10. Elevated Sand Mound Diagram............................................................................................. 66 Appendices Appendix A List of Resources for Making Informed On -Site Wastewater Technology Decisions Appendix B Summary of Interviews with OWTS Expert Panel Members Appendix C Septic Tank Pumpout BMP Justification Calculations Appendix D Evaluation of Nitrogen Removal and Evapotranspiration Associated with Vegetative Cover Present on On -Site Sewage System Dispersal Areas Appendix E Summary of SORA/NEHA Conference Discussion on Interstate Cooperation on Nutrient Reduction Technology, July 2013 Appendix F Assessing the Practicality of Generating and Assigning a Single Soil Texture for Each County in the Chesapeake Bay Watershed OTMA -MC INC. 5