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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Wnrer Qunliry Control Divi.riorr Rationale - Pnge 2, Permit No. CO-0036595 C. CMLRB Permit No.: C-SI-014 III.~CEIVINC STREAM A. Identification, Classification and Standards Identification: Discharges to nn unnamed tributary to Newlin Creek and to Magpie Creek, Segment 14 r jthe Upper Arkansas River Sub-bnsirr of the Arknruns River Bnsirr. 2. Classification: This stream segment is clrusifred for the following uses: Use Protected; Recrentiorr, Clrrs.c 2; Aquatic Life, Clncs 2 (cold); Agriculture. 3. Numeric Standards: The standards which have been assigned in accordance with the above clrrssificntiorr.r can br found irr the Clrusificatiorrs and Numeric Standards for the Arkansas River Basin 3.2.0 (5 CCR 1002-5), ar amended Otrober 11, 1995. !t should be noted that this facility does nor discharge pollutants x~hich are lirrrired by water quality standards with the erceptiorr of pH, for which the standard is 6.5 ro 9.0 s. u. The .cegrnerrt has rro metals standards or standards for other parameters applicable ro this site. B. Receiving Water Dula 1. Ouatrtirv. Acute nrrd Chronic Low Flows.• The flows which will 6e used to calculate acute and chronic e.Qluerrr limitations are the orre day in three year low flow (IE3J nrrd the 30 day in three year low flow (30E3) respenively. Those flows have been determined for the urrrramed tributary to Newlin Creek and for Magpie Geek by rlie Water Quality Control Division, acrd are as follows (all flows in cubic feet per second): Table Ill-2 --Acute and Chronic Low Flows • Acute Chronic Annual 0 0 IV. FACILITY DESCRIPTION A. /rtduslry Description Tvne of Irrdu.strv: The facility is a small underground cool mine located south of Florence, CO. The mined coal is processed irr nrr ors-site prepnrntion plant prior ro shipment. Current production is 320,000 tons per year. Mruimurn prorluctiorr is 500,000 torts per year. 2. Sources to the Trenmrenr Plant: Surface runoff flows to ponds I, 4, 5 and 3 (ou falls 001, 002, 004 nm/ 005, respectively). /n addition, wnrer used in the prepnrntion plant may spill over inro ditches lending to pond 5 and combine with surface rmroff. Well wnrer is stored in pond 3 until needed as make-up water for the prep plant. 3. Chemicals U.red: The permirree did not specify arty chemicals for use irr waters that may be discharged. Orr this basis, rro chemirnls are approved under this permit. Prior to uce of any applicable chemical, the perninee must submit rt request for approval which includes the most current Material Sajery Dntn Sheet (MSDSJ with anrrntic tozicirv information for that chemical. Until approved, use of any chemical in waters that nmy he discharged is rr violation of this permit.