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COLORADO DEPARTMENT OF PUB,...: HEALTH AND ENVIRONMENT, Water Qur....y Control Division <br />Rationale -Page 3, Permit No. CO-0038776 <br />B. Receiving Water Data <br />ua[i Quality data far the North Fork of the Gunnison River are unavailable as there are no state or federal <br />monitoring stations in the vicinity that collect such data. Quality data are not available for Sylvester Gulch or <br />Mittnesora Creek due to their intermittent nature. <br />2. Quantity, Acute and Chronic Law Flows: The flows which will be used to caladare acute and chronic effluent <br />limitations are the one day in three year low flow (/E3) and the 30 day in three year low flow (30E3) respectively. <br />Those flows have been determined for Minnesota Creek and the North Fork of the Gunnison River 6y the Water <br />Quality Control Division, and are as follows (alI flows in cubic jeer per second): <br />Table I//-3 -Acute and Chroaic Low Flows for North Fork <br />of the Gunnison River <br />Acute Chronic ..::;: <br />Annual 28 41 <br />Table //I-4 -- Acute and Chronic Low Flows for Minnesota <br />Creek and Sylvester Gulch <br />Aetite Chronic:. .: <br />Annual 0 0 <br />/R FAC/L/TY DESCR/PT/ON <br />A. /ndustry Description <br />1. Tvne of /ndustry: The facility is an underground coal mining operation produci~rg bituminous coal. The maximum <br />production rate is projected at 7.0 million tons per year. In 1994, 4.2 million tons were produced. ' <br />2. Sources to the Treatment Plant: Table IH-1 shows the active outfalls, their purposes and other relevant information <br />about the treatment sources. There are no new sources although some rerouting of flows has occurred. This is <br />discussed in the next section. <br />3. Chemicals Used: Table IV-1 lists the chemicals used at the plant that may be in the discharge. All chemicals <br />shown have been previously submitted for approval. The table is a summary of the Division's conclusions. <br />Table IV-l -- Chemical Additives <br />Chemical Name Purpose Acceptable/Unacceptable/Discussion <br />Nalco 7883 Enact Flocculation Acceptable <br />Nalco 7888 Clarification Acceptable <br />United 657 Zyme-Flow Crease Prediges[er Accepmble <br />VWR Cuar-Gum Flocculation Acceptable <br />Aluminum Sulfate (ahem) Flocculation Acceptable* <br />• This chemical is acceptable ar norms! dosage roles. However, aluminum can be quite toxic to aquatic life a! high concerttratians. Care <br />should be taken to avoid spins or overdoses. <br />