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COLORADO DEPARTMENT OF PUb HEALTH AND ENVIRONMENT, Water Qc y Control Division Rutiunule - Puye 4, Permit No. CO-0042161 Z. Quantity. Acute and Chronic Low Fows: the flows which will be used to calculate acute and dtronic ejJluem limitations are the one day in three year low flow (1 E3J and the 30 day in three year low flow (30E3J respeesivrly. • Ihose flows have been determined jot Fish Creek by the Water Quality Control Division, and are as follows (all flows in cubic feu per secondJ: Table Ill-3 - Acute and Chronic Low Flows .. ... Acute ::...:.. :.:::... Chrontc:: Annual 0.7 1.4 ry FACILITY DESCRIPTION A. /nduslry Description Tbne of Industry: The facility is an underground coo! mine. There is also an inaetiWC tipple facility about eight miles from the mine. 2. Sources to the Treatment Plant: No changes hour occurred since the previous permit. J. ChemicaLr Used: Four chemicals, Nalco 7883 and 8873 and Environmental Chemistries EnG7um 9015 and EnChem 9307 arc used in the mine industrial treatmem rystem for settling and flocculation. One chemical, Emech Aqua Ward is used in the domestic trtatmem facility to provide drlorine for disinfettion. All of these ahanicalr have been reviewed previously by the Division and were found to be acceptable for use as recommended by the manufacturer. • B. Wastewater Treatment Description The wastewater treatmem system has not changed sinae the previous permit. Briefly, a single sedimentation pond treau underground mine drainage and surface runoff from the site. The permittee adds chemical Jlamlants and coagulants as necessary (su iV.A.3.aboveJ. The discharge from this pond is outfall 001, whidi goes ro Fish CreeE The mine sump is pumped ona every flute to sewn days, typicnUy, with one pump moving 500 to 550 gpm for 18 to 36 hours resulting in 30-day as+erage flows of 0.792 MGD. 7ht facility has the copabiliry to use two pumps in parallel resulting in a capacity of 1700 gpm (daily rnasimum flow = 1.58 MGDJ. !n 1992, the permittee construued a domestic wastewater treatment facility (WWIFJ to replatx a failing septic rystem. The new WW1F consisu of four lined anated lagoons with chlorine disinfection. Disdwrge from this facility goes to the edge of a previously bad~lled area where it mises with spoils spring water from the Emerald Springs spoils spring. The designated dscharge point far outfa11002 is defined as the effluent weir in the comrol building, prior ro emering the spoils spring. The combined spoils spring water is used within the mine for dust suppression. A portion ojthu water is then taken up in the producrd coal, the remainder drains to a sump that is pumped to the industrial pond and disdwrged through outjall 001. Pursuam to the authority of Article 9, Title 25, Regulations for the Certification of Water Treatment Plant and Wastewater Treatmem Pfam Operators, this facility requires a cert~ed operator. The permittee curremly has a Clans D Wastewater Operator. V. PERFORMANCE HISTORY A. Monitoring Data • /. Discharge Monitoring Reoorts: Tables V-1 and V-2 summarize the effluent data reported on the momhly Dtscharge Monitoring Reports (DMR'sJ for the Twenrymile Coa! Company facility from July l , 1993 through June 30, 1994.