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Clean Water Act discharge permit · NPDES COG589073

ARAPAHOE PARK RACETRACK, Arapahoe County, CO: NPDES COG589073 discharge permit, effluent exceedances, inspections, penalties

ARAPAHOE PARK RACETRACK, held by Mile High Racing and Enter dba Arapahoe Park, holds NPDES permit COG589073, which discharges to Murphy Creek. EPA’s file records it issued September 11, 2008 and expiring October 31, 2010. 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 filedARAPAHOE PARK RACETRACK
Permittee as filedMile High Racing and Enter dba Arapahoe Park
NPDES IDCOG589073
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
IssuedSeptember 11, 2008
Expiration dateOctober 31, 2010
AddressArapahoe County, CO 80016
Receiving waterMurphy Creek
SubwatershedCoal Creek (HUC 101900030202)

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
Flow, in conduit or thru treatment plant42725September 30, 2024789% over the limit
E. coli21412August 31, 20191,805% over the limit
Nitrogen, ammonia total [as N]21210September 30, 2020412% over the limit
BOD, 5-day, percent removal176September 30, 2024567% over the limit
Chlorine, total residual264June 30, 201618,627% over the limit
pH233September 30, 2020
BOD, 5-day, 20 deg. C6122September 30, 2024516% over the limit
Plant capacity fact. percent of capacity070
Selenium, potentially dissolvd060
Solids, total suspended220
Oil and grease110
Solids, total dissolved400
Oil and grease visual100

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES COG589073.

Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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, COG589073.

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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 COG589073 there.

Nearby on the register

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