PERMFILE128172

• Permit No: C1981029
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 2.03.10 IDENTIFICATION OF OTHER LICENSES & PERMITS
• Media Type: D
• Archive: No

COLOR-'ADO DE?ART`•~~.EiIT OF Hr~LT:{
• Water Quality Control Di•rision
4210 East 11th Avenue
Denver, Colorado 80220
Page 3 of 4
Permit Va. COG-850012
TV. FACILITY IYFORMATICN: (continued)
capable of containing and creacirg tie peak f'_ow from the '_0-;~esr, 24-hour
precipitation even[. The upper sedimeacacion pond concrois tie runoff
from approx'_mately 50 acres iR tie extreme seuthwest corer of tie
reclaimed mine area. The total ca~aci:'r or .ond volume of tie uDDer oond
is 1.7 acre feet or 5=3,946 gallons, whici is greater clan tae design 10-
year, 24-hour storm event volume of 0.35 acre fee c. The lower pond is
located to the southwest of the upper sedimentation pond. The lower pond
was designed to concroi sur?ace runo=' from a 38.4 acre drainage area and
in addition, the diverted runoff from the ~JO small watersheds. The coral
pond tenacity is 1.2 acre-:eec or '91,020 ¢a1'_ons, which is greater than
the design 10-year, 2~-!:our storm event volume of i.'_2 acrz-feet. The
discharge poiac, Oucfali 002 is a^- cutlet pipe. The Dord :^.as an ooen
channel emergency spil_wa?, wica a two-toot fr=_eboard and is capable of
passing flow from a 100-;year. 24-hour precipitation e•renc. The discharge
goes co Grassy Creek and Lh2R co cz Yamna River.
• Outfall 003 is the discharge poi::[ for tie storm runoff concroi pond known
as the Explosive Storage Area Storage ?ond. The pond is located in the :IE
1,'4, SE 1/4 aP Section 23. Tie pond concrois a runoff area or L
reclaimed acres, which once conta_aed tae explosive storage bench. The
total pond volume is 0.27 acre-feet or 37,890 gallons, which is greaczr
than the design 10-year, 24-dour precipitaticn ever-c volume of 0.23 acra-
feec. The pond discharges to an unnamed tributary of tae '.Tampa River.
Since the facili~r is curreacl•r _nacci-re, an_v discharges °rom tae faciL:-r
should consist of surface runoff c^.1 /. If discharge of mite rater, prep
plan[ water, sanicar-r water or oc`ar non-surface ruROif r=_lated :racer
becomes necassar;r. tie ?ermiccee ~.:___ nave co recuesc c=:ac an lac vidual
:IPDES permit be drsfced prior t., c ie occurs=_nce of such discharge, co
replace this general permit.
V. ANT=DEGRADAT_TON:
Thesz are hoc reviewab!a 'Jo t2 r5 rSU3RC co Section J._.3(3)(a) of the
3asic Standards and :"-ecaodoio¢_asJf.r Sur=ace i.at__ (: C.:R :002-2), based
on a finding of no increased water cualicv lmD aC 7.
VI. DiSG~S;:Of7:

ADD11Cab12 eL_fluenC LimitatiO RS and mO P.l COCing r20Ulr_m2RCS _e4drdiRE
post-mining outfai'_s (001, 002, act 0031, are addressed in ?artTI 3.1(b)
and I.3.:(b) respect:-Ter oc tae ==_neril ?ermi[.