Scientific Investigations Report 2007–5237
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5237
Table 6. Summary of eight on-site wastewater management scenarios tested with the study-area model in the La Pine, Oregon, study area.
[TDC lots: assumes 1,500 lots eremoved from pool of candidate lots. Locations were randomly selected from 2,600 possible lots. Retrofitting: assumes all on-site systems serving homes built prior to 2000 are retrofitted with advanced systems with performance equal to systems installed in new homes. Retrofits are made at a rate of 94 per year until completed in 2057. Abbreviations: TDC, transferable development credit; lb/yr, pound per year; mg N/L, milligram nitrogen per liter]
| Scenario | Effluent recharge concentration (mg N/L) |
Percent reduction from standard systems |
TDC lots |
Retrofitting | Peak loading (lb/yr) |
Peak loading year |
Final loading (lb/yr) |
|---|---|---|---|---|---|---|---|
| 1 | 46 | 0 | No | No | 147,000 | 2019 | 147,000 |
| 2 | 46 | 0 | Yes | No | 125,000 | 2013 | 125,000 |
| 3 | 20 | 57 | No | Yes | 93,000 | 2019 | 65,300 |
| 4 | 20 | 57 | Yes | Yes | 88,100 | 2013 | 55,900 |
| 5 | 10 | 78 | No | Yes | 81,200 | 2000 | 34,200 |
| 6 | 10 | 78 | Yes | Yes | 81,200 | 2000 | 29,500 |
| 7 | 2 | 96 | No | Yes | 80,400 | 2000 | 9,200 |
| 8 | 2 | 96 | Yes | Yes | 80,400 | 2000 | 8,300 |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5237
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