HYDRO31030 - Laserfiche WebLink

Home Browse Search

., COLORADO DEPPRT;SENT OF HEALTH Water Quality Control Division 4210 East 11th A•aenue Denver, Colorado B0220 Page 3 of 4 Permit No. COG-850023 B. Receiving Water Daca 1. Scream Low Flow Not Aoolicabie; effluent '_imitacions are not flow based. IV. FACILE"! INFORM-3TION: The Grassy Gan Coal nine is an inactive and reclaimed sur=ace coal mine. A1'_ discharge points 3C this faci:ity are associated with surface water discharges from the reclaimed areas. No active mining has occurred at this site since 1985, and Rockcasc'_e has removed all mir-e _`acilities from the area, including fuel storage areas. The Rockcascle Company has comeia___ significant raclamac'_on at the mine site. Specifically, the permictee has cemnleted all backfil'_ing and grading activities at tae sits. Additional l_ a~rface areas have been recontoured, and most of the areas have been previously revegetaced. Since the facility is cnrrent'_y inactive, any discharges from the facilit_~ should consist of surface runoff only. If discharge of mine Wacar, prep plant scar, sanitary avatar or other non-surface runoff re'_ated water becomes necessarf, the Permictee will have to request that an individual NPDES permit be drafted prior to tae occurrence of such discharge, to replace this general permit. V. ANTIDECR.4DATION: These are rot reviewable waters pursuar.c co Section 3.':.B(3)(a) of the Basic Standards and KethodoLogies for Surface 'dater (5 CCR 1002-2), based on a finding of no incr=_ased water .uali__ impact. VI. DISCJSSION: Applicable effluent limitations r=_garding acti.e mining oucfalls and post- mining oucfalis, are addressed _-. ?art =.3.1(a) and (b) _=_spect:~ely of the general permit. Applicably effluent monitoring raauiremencs regarding active wining cucfails and ?ost-minine oucfaiis, are addressed in Part I.3.3%a) and (b), __snecc~:ei cf the ~ererai ce:"mit. Cut=ails 'JO1, 002, 003, 004 and 005 are subject to the effluent Limitations and monitoring requirements for post-mining ou~fal'_s ?rovicyd in Part ~.3.1(b) and Part 1.3.3(b) of the general oer~ic. As these outfalls discharge to c^e "~amoa ?.i•~er, a t-ibutar•: of tae Colorado River, focal dissol•:ed ;o:ids monitoring OL ta2 discharge shall be performe:i. T.oca1 ?hosphorus monitoring shai: roc be ?erformed. See ?age _ of the general ?ermit =or mot' '_niormat'_on.