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Clean Water Act discharge permit · NPDES COG500480

GORDON ASPHALT, Denver, CO: NPDES COG500480 discharge permit, effluent exceedances, inspections, penalties

GORDON ASPHALT, held by Martin Marietta Materials Inc, holds NPDES permit COG500480, which discharges to Clear Creek. EPA’s file records it issued July 1, 2008 and expiring June 30, 2013. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedGORDON ASPHALT
Permittee as filedMartin Marietta Materials Inc
NPDES IDCOG500480
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedJuly 1, 2008
Expiration dateJune 30, 2013
AddressDenver, CO 80221
Receiving waterCLEAR CREEK
Receiving water impaired303(D) Listed
SubwatershedOutlet Clear Creek (HUC 101900040404)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Solids, total suspended20455September 30, 2021176% over the limit
Manganese, dissolved [as Mn]18534September 30, 2023363% over the limit
pH20464December 31, 2021
Iron, total [as Fe]18373June 30, 201478% over the limit
Flow, in conduit or thru treatment plant20400
Ethylbenzene0300
Xylene [mix of m+o+p]0300
Iron, total recoverable0220
Oil and grease10200
Oil and grease visual10200
Manganese, potentially dissolvd060

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

DateWhat EPA recordedAgency
May 12, 2023WW Storm Water Non-Construction - Failure to develop any or adequate SWPPP/SWMPST6
May 12, 2023WW Storm Water Non-Construction - Failure to Implement SWPPP/SWMPST6
May 12, 2023WW Storm Water Non-Construction - Failure to properly install/implement BMPsST6

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, COG500480.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID COG500480 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.