Studies
Every limits evaluation this program has run — the study of record, the one in flight, and the scenarios that stress it.
Design flow
5.0MGD
4.0 domestic · 1.0 industrial
Pollutants under study
17
criteria library v6 · 2026-01-15
Limits bound by biosolids
7
40 CFR 503 land-application ceiling
Over-allocated
2
cadmium · mercury
Your permit was reissued 2026‑03‑01.
A written technical evaluation of the need to revise local limits is due within 180 days
(40 CFR 122.44(j)(2)(ii)). The 2026 permit cycle study covers it —
it needs reviewer sign-off.
| Study | Status | Pollutants | Binding leaders | Criteria | Last activity | |
|---|---|---|---|---|---|---|
|
2026 permit cycle update
Annual average flow · full pollutant set
|
In review | 17 | CdHgAs | v6 | 2d ago | Open |
|
Low-flow scenario — August
3.2 MGD critical month · same limits at worst case
|
Draft | 17 | CuZn | v6 | 5d ago | Open |
|
Aluminum addendum
Single-pollutant response to updated aquatic life criterion
|
Submitted | 1 | Al | v5 | 2025-11-02 | View |
|
2021 local limits update
Study of record — codified in the sewer use ordinance
|
Approved | 14 | CdCu | v3 | 2023-04-11 | View |
The approved 2021 study relied on criteria v3.
Three criteria have changed since — the 2026 study quantifies the effect.
Needs attention
Cadmium and mercury are over-allocated.
Committed industrial loading exceeds the maximum allowable industrial loading at
current permitted flows. Review allocation →
Silver has 3 of 12 samples above the detection limit.
Below the 8-sample minimum for a defensible removal efficiency — the study is using a
reference removal rate instead. Review sample data →
Thallium has no influent data.
Its limit derives from the human health criterion with a reference removal rate, and is
flagged as provisional in the submittal.
Activity
RVTA
R. Vasquez set copper removal to observed (0.85)
2 days ago
R. Vasquez raised the safety reserve to 10%
2 days ago
System pinned criteria library v6 to this study
4 days ago
T. Ableman uploaded 2025-Q4 influent metals.csv
6 days ago
R. Vasquez created study 2026 permit cycle update
11 days ago