Southeast Collector Trunk Sewer Route Selection: The Regional Municipalities of York and Durham, Ontario, Canada
Bibliographic record
Abstract
The York-Durham Sewage System (YDSS) is a large regional sewer system carrying approximately 80 percent of the wastewater flows from York Region as well as the communities of Ajax and Pickering in Durham Region. The Southeast Collector (SeC) trunk sewer is the primary outlet sewer to Duffin Creek Water Pollution Control Plant and as such is a critical component of the YDSS. The system will convey the wastewater flows from 1.5 million people by design year 2036. York and Durham Regions completed an Individual Environmental Assessment (IEA) in support of a major trunk sewer capacity upgrade of the SeC trunk sewer. The IEA was the first of its kind required by Ontario's Ministry of the Environment (MOE) for a major wastewater project. The IEA addressed key environmental and public concerns including groundwater impacts from construction/tunneling and public and agency opposition related to pipe construction. To address these concerns, baseline conditions were established and a three-stage methodology was implemented to identify and subsequently evaluate the alternative trunk sewer routes and alternative design methods (e.g., earth pressure balance tunnel technology versus open cut, use of sealed shaft construction, provision of dedicated haul roads and spoil sites, etc.). The IEA recommended the construction of a 15 kilometre, 3000-millimetre diameter sewer by tunnelling (using earth pressure balancing machine (EPBM) and sealed shaft construction). The project involves significant tunneling (five to 40+ metres below grade) under sensitive watercourses (cold water fishery) and associated tributaries and the protection of major groundwater aquifers serving local wells. The IEA document was approved by the MOE in August 2010 and the new sewer is currently under construction. This paper will focus on the political/regulation challenges the team faced and how approvals for this project were obtained. Specifically, a well-documented process was implemented to develop the alternative sewer routes, screen and select a shortlist of alternative routes and finally, select the preferred route. This process contributed to the various political and regulatory agencies approving this significant project.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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 teacher head, 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".