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COLARADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page 3, Permit No. CO-0000221 <br />B. Receiving Water Data <br />1. uali Quality data jot Grassy Creek, Dry Creek and Sage Creek and tributaries are unnecessary. The permitree <br />monitored Fish Creek. The mean of three samples calleded over the period from January, 1992 through September, <br />1996 jot total recoverable iron is 6.77 mg/P. This value will be used in section V1.A.2. {See Table VI-6). <br />2. Quarairv. Acute and Chronic Low Flows: The flows which will be toted to calculate ague and chronic effluem <br />limitations are the one-day-in-three-year taw flow (1 E3) and the 30day-in-three-year low flow (30E3) respectively. <br />Those flaws have been determined for Grassy Creek, Dry Creek, Sage Creek and Fish Creek by the Water Qualit}• <br />Comrol Division, and are as follows (all flows in cubic feet per second): <br />Table III-I -Acute and Chronic Low Flows for Grassy G}eek, <br />Dry Creek and Sage Creek and their tributaries <br />Acute _' Chronic <br />Annual 0 0 <br />Table /II-2 -Chronic Low Flows for Fish Creck <br />Annual .Jan Feb :- Mar Apr May ,Jun . Jul Aug Sep .Oct Nov Dec <br />0.4 2.4 2.4 3.4 5.5 7.0 1.8 0.6 0.4 0.4 1.3 1.3 2.3 <br />!V. FACILITY DESCRIPTION <br />• A. Industry Description <br />1. Tvoe o(fndustrv: Seneca Coat Company operates three surface coal mines -the Seneca !I Mine, the Seneca /I West <br />Mine and the Yoast Mine, together as what they refer to as a "Logical Mining Unit". Some areas of the mines hair <br />beers reclaimed, however, no sedimentation pond systems serve entirely reclaimed areas. Additional information can <br />be found in the previous rationale dated May 15, 1992, and subsequent amendment numbers I and 2, dated <br />December 27, 1993, and April 11, 1996, respectively. <br />2. Sources to the Treatment Plant: The facility generates surface runoff, spoils spring water, pit pumpage (typically <br />precipitation that has entered the actively mined pit areas) and vehicle (coal haul truck) wash water. These waters <br />are routed to the various sedimentation ponds for treatmem and discharge. Table 71-I on page 2 specifies which <br />sources are treated in specific pond systems. <br />3. Chemicals Used: The permirtee did not specify any chemicals for use in waters that may be discharged. On this <br />basis, no chemicals are approved under this permit. Prior to use of any applicable chemical, the permittee must <br />submit a request for approval which includes the most current Material Sajeh• Data Sheet (MSDS) for that chemical. <br />Until approved, use of any chemical in waters that ma}' be discharged could result in discharge ojpollutants nor <br />authorized under the permit. Also see Pan !/.A.2. of the permit. <br />B. Wastewater Treatmen[ Description <br />The treatment s}~stem is unchanged from that described in the previous permit and subsequenl amendment numbers 1 and <br />2. Please refer to these documents for further information. <br />Pursuant to the authority ojAnicle 9, Title 25, Re~tations (or the Cenification of Water Treatment Plant and <br />Wastewater Treatment Plant Operators, this facility may require a cenified industrial operator. The permitree should <br />comact the Colorado Plant Opertuors Cenification Board at (303) 692-3SS0 for further information. <br />C <br />