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COLORADO DEPARTMENT OF PUBL/C HEALTH AND ENVIRONMENT, Water Qualiry Comrol Division <br />Rarionale -Page 3, Permit No. CO-0027146 <br />Segment 2 Only <br />Metals Teri ar Ana[vtical Method <br />Iron (Fe) Chronic 2000 ug/Q Total Recoverable <br />B. Receiving Water Data <br />ali :Qualiry data for the Colorado River are available from sampling records of CDPHE station 000048, located <br />near Cameo, upstream of the Powderhorn Coal Co. discharge. A summary of the quality data far IS data poims <br />collected February 1986 and June 1988, is shown in Table I!I-1. <br />Table I//-I -Quality of Receivine Water <br />,. . <br />M :... <br />;. <br />Parameter ..:.:.:::... Mean ..: :. ' .:::.:: ax/Min :: <br />Total Recoverable Iron, ug/Q <br />1600 <br />0/9200 <br />2. Quantity. Acute and Chronic Low Flows: The flows which will be used to calculate acute and chronic effluent <br />[imitations are the one day in three year !ow flow (IE3) and the 30 day in three year low flow (30E3) respecrively. <br />Those flows have been determined for the Colorado River and Coal Creek by the Water Qualiry Control Division, and <br />are as follows (al! flows in cubic jeer per second): <br />Table I//-2 -Acute and Chronic Law Flows for the Colorado River <br />:.. <br />".Acute Chiontt <br />Annual 178 <br />412 <br />Table //I-3 -Acute and Chronic Low Flows jot Coal Creek <br />Acute. hronie ..:. . <br />C <br />Annual 0 0 <br />ry FACILLTY DESCRIPT/ON <br />A. Industry Description <br />1. j}!pe of Industry: Pawderhorn Coa! Company operates two underground coal mines -the Roadside South and North <br />Portals. Current production is 350,000 clean tons per year. Projected maximum production is 2.4 million clean tons <br />per year. There is a heavy media preparation plant at the site, as well as a coal loadout. The federal guidelines <br />which apply to this facility are found under 40 CFR 434, rifled Coal Mininy~'1Ruent Guidelines. <br />2. Soarces to the Treatmem Plant: The facility generates surface runoff and mine drainage. These waters are routed to <br />the various sedimemation ponds jot treatmem and discharge. Table I/-1 on page 2 specifies which sources are treated <br />in specific pond systems. <br />3. Chemicals Used: The permiaee indicated that three chemicals are used to treat waters oral may be in the efflaeu <br />discharges. These chemicals are summarized in the table below. The table shows whether the Division finds the <br />chemicals acceptable for discharge at concerurations appropriate for the purposes intended. <br />~:. <br />