Legacy Pollutant Total Maximum Daily Loads:An Oxymoron?
Bibliographic record
Abstract
Legacy pollutants (such as pesticides, polychlorinated biphenyls (PCBs), and other chemicals banned from use years ago) represent a major challenge to the states' total maximum daily load (TMDL) programs. However, many legacy pollutant sites are regulated under one or more existing federal programs. Therefore, legacy pollutant TMDLs often represent a form of regulatory double jeopardy as successful execution of federal program regulated cleanup does not preclude responsible parties from the TMDL provisions of the Clean Water Act. In addition, certain legacy pollutants have shown to bioaccumulate, which allows TMDLs to require reduction of fish tissue burdens for the removal of fish consumption advisories. Often, water column concentrations derived from targeted fish tissue body burdens are far below the analytical detection limit, exceed background pollutant concentrations and are not supported by site-specific data. These issues require alternative approaches for establishing legacy pollutant TMDLs.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.005 |
| Scholarly communication | 0.004 | 0.006 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.009 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".