The discharge & the receiving water
Dilution at the design low flows, and the burden the receiving water already carries.
A real impact study screens the project's discharge against the assimilative capacity of the receiving stream — how much pollutant that stream can take before it breaches a criterion — at the stream's cited design low flows. The design flow matches the criterion type: chronic aquatic-life dilution at the 7Q10, and acute dilution at the 1Q10, which is the sharper single-day design low flow. It also sets that discharge beside what the county's TRI reporters already release. These are screening bands. They are not a permit determination.
The dilution screen · baseline
| Discharge → receiving water | Design 7Q10 | Discharge | Chronic | Credited | Acute (1Q10) | Evidence |
|---|---|---|---|---|---|---|
| Bowling Green Water Pollution Control→ Poe Ditch (Bowling Green WPC outfall, RM 2.5) | 0 cfsOhio EPA NPDES fact sheet 2PD00009*TD (Bowling Green Water Pollution Control, 901 N. Dunbridge Rd, Wood County; application OH0024139), page 30 of 35, 'Table 12. Instream Conditions and Discharger Flow' — basis 'USGS Gage #04195500' (Portage River at Woodville) 1951-97, adjusted for drainage area, footnoted '*Flow data from Low-Flow Characteristics of Stream in Ohio through Water Year 1997 and adjusted for drainage area'. Discharge location Poe Ditch RM 2.5, HUC 04100010-03-01, Ohio EPA river code 16-108. A short distance downstream Poe Ditch enters the North Branch Portage River at RM 8.56 (river code 16-007), and it is the NORTH BRANCH's criteria that are applied to this discharge — quoted: 'Water quality criteria associated with these uses are applied to Bowling Green WPC to be protective of this higher quality stream.' Source: data/documents/oepa/bowling-green/2PD00009.fs.pdf; structured read data/extracted/oepa/bowling-green/2PD00009.fs.npdes.yaml. [verified] | 15 cfs | 0.02:1 · violation | — | 0.02:1 · violation | [verified] |
1 of 1 receiving reach fails a dilution band at design low flow. The effluent-credited ratio counts the permitted effluent already in the reach (WS-15); a cited 1Q10 of 0 cfs is a stream that runs dry at design low flow — no acute capacity at all.
What the county's TRI reporters already release
| Facility | City | RSEI score |
|---|---|---|
| JOHN A BIEWER CO OF TOLEDO | PERRYSBURG | 6,613,841.3 |
| FIRST SOLAR INC | PERRYSBURG | 553,447.7 |
| PILKINGTON N.A. INC | ROSSFORD | 335,555.7 |
| FIRST SOLAR INC | WALBRIDGE | 254,209.4 |
| CAST MASTERS | BOWLING GREEN | 253,362.5 |
Any new discharge lands on top of this baseline — the point of reading the two halves together. The full ranked inventory and its reading caveats are in the RSEI annex.
The record behind this chapter
What this chapter stands on: the records it reads, the inputs its modeled figures rest
on, and the reference data behind its baselines — the same pages the record screens
serve, not a second copy. A figure the record does not support stays [open] and links nothing.
- 2PD00009.fs.pdfOhio EPA
- Bowling Green Water Pollution Control (WPC)Permits
- Permits2 records
- RSEI toxic-release inventory (EPA)Reference dataset