Walker Ruby Mining Co Inc

NPDES permit CO0037206 · Minor NON-POTW · administratively continued, expires 2018-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2018-08-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

4values over a limit
0required values missing, on 0 form(s)
0of 19 forms filed late

Last period with anything received: 2026-07-31. Most often over: Flow, in conduit or thru treatment plant (4).

Reporting

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

Limits in force (53)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMX WK AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 20 mg/L all year
001Solids, total suspendedMX 7D AV <= 30 mg/L all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG report only all year
001Cadmium, total [as Cd]30DA AVG <= 50 ug/L all year
001Cadmium, total [as Cd]DAILY MX <= 100 ug/L all year
001Copper, total [as Cu]30DA AVG <= 150 ug/L all year
001Copper, total [as Cu]DAILY MX <= 300 ug/L all year
001Lead, total [as Pb]30DA AVG <= 300 ug/L all year
001Lead, total [as Pb]DAILY MX <= 600 ug/L all year
001Zinc, total [as Zn]30DA AVG <= 750 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 1500 ug/L all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
001Zinc, potentially dissolved30DA AVG <= 88 ug/L all year
001Zinc, potentially dissolvedDAILY MX <= 116 ug/L all year
001Copper, potentially dissolved30DA AVG <= 7.2 ug/L all year
001Copper, potentially dissolved30DA AVG <= 6.6 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 11 ug/L all year
001Copper, potentially dissolvedDAILY MX <= 9.6 ug/L all year
001Arsenic, potentially dissolvedDAILY MX report only all year
001Chromium, trivalent, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvd30DA AVG <= 1.9 ug/L all year
001Lead, potentially dissolvd30DA AVG <= 1.7 ug/L all year
001Lead, potentially dissolvdDAILY MX <= 48 ug/L all year
001Lead, potentially dissolvdDAILY MX <= 47 ug/L all year
001Manganese, potentially dissolvd30DA AVG report only all year
001Manganese, potentially dissolvdDAILY MX report only all year
001Nickel, potentially dissolvd30DA AVG report only all year
001Nickel, potentially dissolvdDAILY MX report only all year
001Selenium, potentially dissolvd30DA AVG <= 5.2 ug/L all year
001Selenium, potentially dissolvdDAILY MX <= 21 ug/L all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Chromium, trivalent total recoverable30DA AVG report only all year
001Chromium, trivalent total recoverableDAILY MX report only all year
001Flow, in conduit or thru treatment plant30DA AVG <= .054 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total [as Hg]30DA AVG <= 1 ug/L all year
001Mercury, total [as Hg]DAILY MX <= 2 ug/L all year
001Oil and grease visualINST MAX report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 25 tox chronic all year
001Static Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 25 tox chronic 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