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COLORADO DEPARTMENT OF I~IC HEALTH AND ENVIRONMENT, Ware~aliry Courrul Divisiurr <br />Amendment No. 1 -Rationale. Page 2. Perini[ Na. CO-0038024 <br />UT means ururamed tributary to <br />• Four sources.' mine water, W7P re~eet water, WWTF efJfuenr arui shop/con~ryor washdo»n <br />///. PURPOSE OF AMENDMENT <br />In a letter dated March 3l, 1995, the perntittee requested addition oja new dischnrge point, #029, from n nex• ur+dergrum+d <br />mining area. The discharge will consist of mine water pumped from an underground sump designated as SOH#6. Wnrer x•i!! <br />be pumped to the surface where it will be treated in a sedimentation porn! with a torn! volume of 0.093 MG (0.068 MG water <br />volume and 0.025 MG sediment storage volume). The mazimunt daily flow is 200 gpm (0.29 MGD). Discharge goes ru an <br />unnamed tributary of Red Wash. <br />N. RECENING STREAM <br />A. Identification, Classification and Standards <br />Identification: Outfall 029 discharges ro an unnamed tributary to Red Wnsh, tributnrv to the White River, within <br />Segment I3a of the White River Sub-basin of the Lower Colorado River Basin. The White River is wuhin segurent <br />12 of the White River Sub-basin of the Lower Colorado River Basin. <br />2. Classiflcatiart: Segment ]3a is classified for the following uses: Use Protected; Recremion, Class 2; Aquatic Life, <br />Class 2 (Warm); Agriculture. Segment 12 is class fled for the following uses: Recrenrion, Class 1; Ayunric Life, <br />Class /(Warm J; Water Supply; Agriculture. <br />3. Numeric Star+dnrds: The complete list of srar+dards which have been assigner! in accordance xdth the ubuve <br />classification con be jourul in 3.7.0, Classifications oral Numeric Sturtdards jar the Lower Culurado River Basin (5 <br />CCR 1002-8). The following numeric star+dards which have been assigned in accordance with the uhuve <br />classificntiorrs will be used to develop e,/fluenr lirnitntioru. <br />Phvsical mui Bioloeical <br />pH= 6.5-9.Os. u. <br />It is not necessary to consider impacts on the White River from this dischnrge due ro the approzirrrare tx•u rrrile <br />distmtce. Additionally, there is a large dilution available at the confluence with the White River. Only mine water <br />is continuous; the dilution ratio between: the total mine water flow from uutfnRs 004, 024, 026 and 029 and rhr <br />White River !ow flow is at least 236:1, based on recent dischnrge mm~iroring reports. Aral, this juctur is vein <br />coruervative because all mine water outfalls do not normally discharge ur the sun+e nine. <br />B. Receiving Water Data <br />uali Quality data for the tributary artd Red Wash are unavailable. <br />2. Quantity. Acute oral Chronic Low Flows.• The flows which will be used m calculnre ncute anal chronic efJluenr <br />limitations are the one day in three year low flow (l E3) and the 30 day in three year low flox• (30E3J respectiveh~. <br />Those flans hove been determined for Red Warh and tributaries, and are as follows (nll flows in cubic feet per <br />secorrdJ.• <br />Table IV-I --Acute and Chroaic Low Flows !or Red Wash and tribataries <br />Acute Chronic <br />Annual 0 0 <br />