# Year Zero Wastewater Solvent Screening

**Status:** 2027 planning allowance

## Purpose

Year Zero should identify possible solvent or other volatile-organic-compound
discharges before the City invests in permanent sewer sensors. Wastewater staff
could review known high-risk areas, screen accessible manholes from the surface,
and collect targeted upstream and downstream samples where screening or operating
history suggests a concern.

This is a wastewater-rate-funded planning item. It does not change the draft
property-tax levy.

## Working cost

| Item | Planning range | Working basis |
| --- | ---: | --- |
| Targeted laboratory VOC testing | `$720-$4,000` | 12-20 samples at the federal planning range of `$60-$200` per VOC sample |
| Sample containers, courier and documentation | `$500-$1,000` | Allowance pending a laboratory quote |
| Short-term PID rental, calibration or technical support | `$1,000-$2,000` | Quote required; purchase is deferred |
| **Total planning range** | **`$3,000-$6,000`** | Rounded Year Zero allowance |

Use **`$5,000`** as the working budget line. Existing wastewater staff can
perform the mapping, route review and surface observations within current
capacity, subject to the City's health-and-safety procedures.

A photoionization detector can indicate elevated VOC vapour and help locate a
source, but it does not identify a specific solvent or replace laboratory
analysis. Low-cost consumer TVOC sensors are suitable for informal indication
only; they should not be used as a safety instrument or as evidence of a legal
discharge.

## Suggested sequence

1. Map industrial, commercial and historical high-risk areas against the sewer
   network and existing complaints or inspection records.
2. Use a calibrated instrument from the surface at selected access points. No
   worker should enter a manhole for this screening without the City's confined
   space assessment, plan, permits, atmospheric testing and rescue controls.
3. Collect targeted upstream and downstream samples where a signal appears.
4. Use laboratory results and successive manhole comparisons to narrow the
   source, then contact the responsible business or regulator as appropriate.

The results should record locations, dates, instrument calibration, weather and
flow conditions, screening readings, laboratory results, follow-up actions and
whether the suspected source was confirmed. A later permanent sensor proposal
should depend on repeated evidence of a recurring problem and a published cost
and service case.

## Sources and limitations

- [Federal laboratory cost guide](https://gost.pwgsc-tpsgc.gc.ca/fld_cst.aspx?lang=eng):
  published planning range of `$60-$200` per VOC sample.
- [Ontario wastewater sampling protocol](https://www.ontario.ca/page/updated-protocol-sampling-and-analysis-industrialmunicipal-wastewater):
  sampling, analysis and quality-assurance guidance.
- [Ontario confined-space regulation](https://www.ontario.ca/laws/regulation/050632):
  requirements for atmospheric hazards and calibrated instruments where workers
  enter confined spaces.
- [Wastewater Infrastructure and Ratepayer Protection](https://helpos.ca/mayor/wastewater):
  platform context for user-fee-funded wastewater services and contamination
  tracing.

The range is a planning estimate rather than a laboratory or equipment quote.
The City should obtain a local laboratory quote and confirm whether existing
staff have suitable training and equipment before approval.