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<br />COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Qunliry Cor+rrol Division <br />Rmionn[e - Pnge 3, Permit No. CO-0038776 <br />B. Receiving Water Data <br />unli ~: Quality darn jot the North Fork ojrhe Gunnison Rirer ore unavailable ns there ore no sane or federal <br />monitoring stations ire the vicirriry that collect such dntn. Quality darn are nor nvnilnble jot Sylvestr~r- Gulch or <br />Mirrrresotn Creek due to their irrtermirrenr nature. <br />2. Quanrirv. Acute and Chronic Low Flows: The flows which will be used to calculate acute nerd chronic effluerrl <br />limitations are the one day in three year low flow (IE3J acrd the 30 day in three year low flow (30E 3J respectively. <br />Those flows have been determined for Minnesota Creek and the North Fark ojrhe Gur+nisor+ River trv the Wnrer <br />Quality Control Division, and are ar follows (nlI flows in cubic jeer per second): <br />Table 1/I-3 -- Acute and Chronic Low Flows for North Fork <br />oJthe Gunnison River <br />Acute Chronic <br />Annual 2.4 <br />41 <br />Table ///-4 -- Acute and Chronic Low Flows for Minnesota <br />Creek and Sylvester Culeh <br />Acute Chronic <br />Annual 0 0 <br />/V. FACILITY DESCRIPTION <br />A. /ndustry Description <br />1. Tvne of Irrdusrrv: The jnciliry is an undergrourul root mining operation producing bituminous cool. The nrarimum <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 11l-1 shows the active outjallr, their purposes nerd other relevnru it forrr+nrion <br />about the treatmer+t sources. There are no new sources although some rerouting ojflows has occurred. 7hi.c i.r <br />discussed in the rrezr senion. <br />3. Chemicals Used.• Table IV-1 lists the chemicals used at the plaar thnr may be in the discharge. All chemicals <br />.shown have been previously submitted for approval. The table is a summary ojrhe Division's corrclusiorr.c. <br />Table /V-1 -- Chemical Additives <br />Chemical Name 1°urpose Acceptable/Unacceptable/Discussion <br />Nalco 7883 Enact 1~locculnrion Acceptable <br />Nnfco 7888 ('lnrificatiorr Acceptable <br />Nnlca 8852 l~loccufatiori Uracceptable-High Aguntic Toxiciry* <br />United 657 Zvme-Flow Grease Predigesrer Acceptable <br />VWR Gunr-Gum 1Tlocculation Acceptable <br />Aluminum Sulfate (nlumJ 1'locculnrion Acreprnble*"' <br />• The Di+isian has conerm that /his chrmira( ran cause mriciry to aquatic lift, even al recommended dosages. tf the pernriuer s'erks m use <br />ir, thry wi(( need to submit frcrther donrmemm~on that demonstrates that rate wmrld not threaten aquatic (ife and that adequntr conrrnls <br />Mould be applied. <br />•• Iris chemical it acceptable at normnf dosage meet. Rowrver, aluminum can be quite tonic to aquatic life ar high conaerurannnc Cnre <br />slrarrld be taken to avoid rpilLs or ov.srdoses. <br />