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Scientific Investigations Report 2007–5237

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5237

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Table 7. Summary of model simulation results for eight on-site wastewater management scenarios tested with the study-area model in the La Pine, Oregon, study area.

[Acres are based on simulated nitrate concentrations in the uppermost active (saturated) model cells. Equilibrium acreages are based on simulated nitrate concentrations at end of simulation (2139). Peak acreages are based on simulated nitrate concentrations in the year when the highest concentrations occur for each scenario. Abbreviations: TDC, transferable development credit; mg N/L, milligram nitrogen per liter; lb/yr, pound per year; mg/L, milligram per liter; Symbol: –, no data]

Scenario Effluent recharge
concentration
(mg N/L)
TDC Equilibrium   Peak
Equilibrium nitrate loading(lb/yr) Reduction in loading from scenario 1 (percent) Acres greater than 10 mg/L at equilibrium Reduction from scenario 1(percent) Acres greater than 10 mg/L at peak Reduction from scenario 1(percent) Peak concentration year
1 46 No 147,000 9,398 9,398 2139
2 46 Yes 125,000 15 7,317 22 7,317 22 2139
3 20 No 65,300 56 1,909 80 1,944 79 2053
4 20 Yes 55,900 62 1,433 85 1,456 85 2049
5 10 No 34,200 77 700 93 1,233 87 2038
6 10 Yes 29,500 80 619 93 1,153 88 2035
7 2 No 9,200 94 115 99 975 90 2027
8 2 Yes 8,300 94 109 99 975 90 2027

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