Spring Gulch Coal Company

NPDES permit WY0030317 · Minor NON-POTW · expired 2024-09-30 · EPA's file as of 2026-09-26

Keep this permit as a site — opens New site at EPA's facility point (43.92671, -108.68376); you set the radius.

Check this month's numbers before you file

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

These are the last limits EPA's file holds for this permit, from an earlier version of it (version 0 in EPA's file): its current version carries none yet. Read your permit: a renewal can change them.

EPA's record, 2025-09-01 to 2026-08-31

EPA's file shows no filings for this permit in this window. That is a statement about the file, not about the facility.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among WY permits in EPA's filings — check your permit).

Outfall 004, form CM (Coal Mine): files for periods ending in Oct, Nov, Dec

How strict are these limits?

Each concentration limit against the same limit in comparable permits. Where it appears more than once, its strictest value.

Solids, total suspended, daily maximum 70 mg/L — stricter than 45% of 44 other minor industrial and other permits in Wyoming; 18% have the same limit
Solids, settleable, daily maximum .5 mL/L — stricter than 11% of 773 other minor industrial and other permits nationwide; 33% have the same limit
Solids, total suspended, monthly average 35 mg/L — stricter than 3% of 80 other minor industrial and other permits in Wyoming; 20% have the same limit
Iron, total [as Fe], monthly average 3.5 mg/L — stricter than 0% of 2304 other minor industrial and other permits nationwide; 2% have the same limit
Iron, total [as Fe], daily maximum 7 mg/L — stricter than 0% of 1416 other minor industrial and other permits nationwide; 5% have the same limit
pH, instantaneous minimum at least 6.5 SU — stricter than 0% of 302 other minor industrial and other permits in Wyoming; 99% have the same limit
pH, instantaneous maximum 9 SU — stricter than 0% of 303 other minor industrial and other permits in Wyoming; 99% have the same limit

2 other limits: fewer than 20 comparable permits.

Limits in force (12)

Outfall	Parameter	Statistic	Limit	Months
004	pH	instantaneous minimum	>= 6.5 SU	all year
004	pH	instantaneous maximum	<= 9 SU	all year
004	Solids, total suspended	monthly average	<= 35 mg/L	all year
004	Solids, total suspended	daily maximum	<= 70 mg/L	all year
004	Solids, settleable	daily maximum	<= .5 mL/L	all year
004	Iron, total [as Fe]	monthly average	<= 3.5 mg/L	all year
004	Iron, total [as Fe]	daily maximum	<= 7 mg/L	all year
004	Iron, dissolved [as Fe]	instantaneous maximum	<= 1000 ug/L	all year
004	Manganese, dissolved [as Mn]	instantaneous maximum	<= 1462 ug/L	all year
004	Duration	monthly total	report only	all year
004	Flow	monthly average	report only	all year
004	Flow	daily maximum	report only	all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states