How can the Goulais'…

How can the Goulais' Assimilative Capacity Be Modeled Without Accounting for the Permit to Take Up to 11 Million Litres/per day?
How can we model the river’s ability to handle wastewater — while not fully accounting for up to 11 million litres of water being withdrawn every day under a water-taking permit? 🤔
That’s a key question members of the public are rising about the Goulais River ACS being used to justify the WWTP.
This post specifically focuses on how the calculations were done — and most importantly what appears to be unaccounted for.
🌊🌊🌊 THE ACS RELIES ON BACK-CALCULATIONS FROM ONE UPSTREAM LOCATION
The ACS uses water‑quality data from an upstream monitoring point to:
👉🏾 set “background” conditions
👉🏾 determine whether the river meets provincial guidelines
👉🏾 calculate how much pollution the river can “assimilate”
👉🏾 justify the proposed effluent limits
These are back‑calculations — meaning the entire model depends on the accuracy and representativeness of that upstream dataset.
🚩🚩 The upstream location does not seem to reflect real‑world flow conditions because the resort itself is permitted to remove large volumes of water from the same river 🚩🚩🚩 And those withdrawals don't appear to be included in the ACS calculations.
💦💦💦 THE RESORTS PERMIT TO TAKE WATER
Searchmont Resort actively holds a Permit to Take Water (PTTW) posted on the Environmental Registry of Ontario.
🔎 Check it out for yourself under ERO Posting: 019‑6965 — Searchmont Resort Permit to Take Water
This permit allows the resort to withdraw the following from the Goulais River:
💥 131,000 litres/day for potable water
💥 11,498,000 litres/day for snowmaking
💥 up to 80 days per year
These withdrawals:
❌ reduce river flow
❌ reduce dilution capacity
❌ occur during winter low‑flow periods
❌ coincide with the most sensitive conditions for ammonia and dissolved oxygen
❌ change the timing and temperature of return flows
Yet the ACS assumes:
👉🏾 fixed flow
👉🏾 instantaneous mixing
👉🏾 no water withdrawals
👉🏾 no snowmaking impacts
🚩 🚩 This suggests the ACS may be modeling conditions that do not fully reflect actual operating conditions.
🚨🚨🚨 WHY DOES THIS MATTER?
If the upstream data is used to calculate assimilative capacity, but the river flow is being reduced by permitted withdrawals, then:
🧐 the dilution used in the ACS is overestimated
🧐 the river’s ability to handle additional discharge is inflated
🧐 the effluent limits being proposed are based on unrealistic assumptions
🧐 the ACS may not fully align with the intent of Ontario’s water-quality policies
🧐 the public and MECP may be relying on a model that does not fully reflect real-world conditions
🚩🚩 This is a major gap — and may affect the validity of the entire assessment.
🌏🌎🌍 WHY THIS MATTERS FOR THE GOULAIS RIVER AND LAKE SUPERIOR
The Goulais River flows directly into Lake Superior. If the ACS overestimates the river’s capacity to dilute wastewater, the impacts don’t just affect Searchmont and Goulais — they move downstream right into Lake Superior.
♻️ Ontario’s Great Lakes Strategy emphasizes the need to reduce nutrient loading and protect cold‑water systems like the Goulais. Which means the quality of the ACS is paramount....