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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page 3, Permit Na. CO-0000221 <br /> <br />B. Receiving Water Data <br />uali Quality data jot Grassy Creek, Dry Creek and Sage Creek and tributaries are unnecessary. The perrtiittee <br />monitored Fish Creek. The mean of three samples colleaed over the period from January, 1992 through September, <br />1996 for total recoverable iron is 6.77 mg/f. This value will be used in section Vl.A.2. (See Table V!-6). <br />2. Quantity, Acute and Chronic Low Flows: The flows which will be used to calculate acute and chronic effluent <br />limitations are the one-day-in-three-year low flow (IE3) and the 30da}~-in-three-year low flow (30E3) respectively. <br />Those flows have been determined for Grassy Creek, Dry Creek, Sage Creek and Fish Creek 6y the Water Quality <br />Control Division, and are as follows (all flows in cubic feet per second): <br />Table ///-1 -Acute and Chronic Law Flows for Grassy Creek, <br />Dry Creek and Sage Creek and [heir tributaries <br />Acute Chronic <br />Annual <br />0 <br />Table /1I-2 -Chronic Low Flows for Fish Creek <br />Annual Jan Feb Mar Apr May Jun Jul Aug Sep .Oct Nov Dec <br />i <br />0.4 2.4 2.4 3.4 5.5 <br />I['. FACILITY DESCRIPT/ON <br />.4. /nduslry Descrption <br />7.0 J.8 0.6 0.4 0.4 I.3 1.3 2.3 <br />Tvoe of/ndustrv: Seneca Coal Company operates three surface coal mines -the Seneca I/ Mine, the Seneca 1l West <br />Mine and the Yoasr Mine, together as what they refer to as a "Logical Mining Unit". Some areas of the mines have <br />been reclaimed, however, no sedimentation pond systems serve entirely reclaimed areas. Additional information can <br />be found in the previous rationale dated May I5, 1992, and subsequent amendment numbers 1 and 2, dated <br />December 27, 1993, and April 11, 1996, respectively. <br />?. Sources to the Treatment Plam: The facilin generates surface runoff, spoils spring water, pit punipage (typically <br />precipiraiion 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 treatment and discharge. Ta61e II-1 on page 2 specifies which <br />sources are treated in specific pond systems. <br />3. Chemicals Used: The permittee did not specify an} chemicals for use in waters that mm• be discharged. On this <br />basis, no chemicals are approved under this permit. Prior to use ajany applicable chemical, the permirtee must <br />submit a request for approval which includes the most current Material Sajen• Dafa Sheer (MSDS) for rhar chemical. <br />Until approved, use of am' chemical in waters rhar may be discharged could result in discharge of pollutants nor <br />aurhort;ed under the permit. Also see Pan II.A.2. of the permit. <br />B. Wastewater Treatment Description <br />The treatment system is unchanged from that described in the previous permit and subsequent amendment numbers 1 and <br />2. Please refer ro these documents for funkier information. <br />• <br />Pursuant to the authorin' of Article 9, Title 25, Rexularians for the Cenifrcarion of Water Treatment Plant and <br />Wastewater Treatment Plant Ooerarors. this facility may require a cenifred industrial operator. The perntittee should <br />contact the Colorado Plant Operators Certification Board at (303) 692-3550 for further information. <br />