HYDRO22809

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Name: RATINALE FOR PUBLIC NOTICE
• Permit Index Doc Type: CORRESPONDENCE
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Wnrer Qunliry Corm'ol Divisiar
Rnriunnle, Anrenrbneut Nn. 4 - Pnge 2 Permit No. CO-0032/75
Ill. RECEIV/NC STREAM:
Ourfnll 017, n new dischnrge of surjnce runoff mrd poteruinl mine water, is being ridded to the permit. L discharges ro
Onk Gulch, ns shown in nme»ded Figure 4 of the permit. The gulch is rributarv ro the Ynnrpn River nrrr! i.c n•irlrirr
segment 3a of the Lower Yampa River. 77ris segment is c/nssified.• Use Protected; Aquatic Lije, Closs 2 (worm);
Recreation, Class 2; Agriculture. Refer to previous permit renewal rationale for additional it fornmrion regarding the
receiving venters.
Arrrideerndnrion: Becnuse this segment is use prorened, m+ muidegrndntion review is nor required pursumu rn 3.1.8(3)
of 77re Bacic Stmrdnrds mrd Merhodo[oriec (or Surface Wnrer.
11r. PURPOSE OF AMENDMENT:
Irr n letter doted January 12, 1995, the per~rriltee requested the addition of orre new ou fall, 017, jot the dischnrge of
sruface runoff and possible mine Wnrer from n new mining nren. 71re added ourfnll is noted ns .such in the rnhle above.
1n nddiriorr, the permirree has recoruoured surjnce areas nurl begwr revegernrion in nrear served by aurfnll.c 003, 006 nnrl
014, n.r n•e[l ns mo.rr of the nren sewed by owfnll 005. 71rey requested conversion of limitminrr.c for these uurfirllc ru
parr-mitring limitnrian.c.
l'. CHANCES TO EFFLUENT LIMITAT/ONS AND MONITORING REQU/REMENTS:
Becnuse ojthis request, ourfnll 017 is being added to Ports LA.I.cJ nrrd LB.LbJ ojrhe pernrir, which m'e the effluent
limimrions and monitoring requirements for combined surjnce runoff and mine venter. Also, requirements jnr mnjnlLs
003, 006 mrd 014 hove been changed from attire mining to postaninbrg, resuhing in crenriorr ojnen• po.n-nrrnin,q
sections jar e~lueru limitations and monitoring requirements.
Bemuse portions of areas served by ourfnll 005 ore nor reclaimed, federal effluent guidelines require rhnr it remnirr
co rererl by the eci.rting ejJ'luenr [imitations jnr active areas. A spoils spring surfaces rrs n small ro(unre seep helmv dre
Cnvnte Dam, but nhore the effluent flume, Thus becoming n port ojrhe dischnrge nt ourfnll 005. Dw'ing the ln.n permit
rrnewnl, the Division evnlunrerl this seep and determined that it was rmt expected ro present n poreminl fro- inrpnn ors the
recei ring srrners, nrrd an exemption fi'orr+ mofrirortag vent grinned for this seep flow. !f darn from the spoilt spring
berunre available in the future, we veil! review them ro derernrine if the quality appears affected by pact or present mining
nttivities. /fit is determined rhnr ndditiorrnl action is necessnrv because ojthis source, the permit mm~ be reopened nr n
later dote. Orherwi.re, the exemption will remain in effect.
Vl. PERAIIT PAGES AMENDED AS A RESULT OF THIS AMENDM1IENT.•
A..' n re.cu6 ojthis nnrendmeur, pages In, /h, Ic, /d, /e, If Ig, lh, li, /j nnrl to of the perrnir ern heing nrnenrled, and
page ldi is heing ndrlerl.
Jon C. Kuhic
March 28, 1995
V/l. PUBLIC NOTICE COMMENTS: