2006-08-02_PERMIT FILE - M2005080

• Permit No: M2005080
• IBM Index Class Name: Permit File
• Doc Date: 8/2/2006
• Doc Name: Notice of Rebuttal Exhibits
• From: Attorneys for Applicant
• To: DMG
• Media Type: D
• Archive: No

COLORADO DEPART,HFJ/! OF PUB[JC l1EAL77t OIAlEA7; Wmer Qualtry CanrMDivfslan .
Ra7onale -Page 1. Penntr No. COGSQ'Cg7
RATTONALE
SAND AND GRAVEL PRODUCTTON OPERATTONS
(AND OTHER NONMETALLICAIINERALSEXCEPTFUELJ
GENERAL PERMIT IN COLORADO
COLORADO DISCHARGE PERMIT NUMBER COG-500000
FOURTHRENER'AL
CONTEMS PACE
!. UPDATE I
il. SlORAfli'ATERPROGRAM I
IfI. COVERAGE UNDER ni6'PERMrf 1
ry CERTIFICATION 3
Y. 7ERMSAND CONDJnOl/SOFPERSOT 2
YI. REPORT/NGREQUlRf.MENIS ~
sa PuaLtcrtoncecNANCFS ~
UPDATE
This is for the renewal ojthegeneral sand and gravel permitfirst issued on October 18,1981, with reissuances onJune I D,1987, August
3J, 1991, and August 3/, 1997. The General Permit system for regulatingsand and grave! production operations has worked well for
the State of Colorado.
The following minor changes have been made to the permit and Rationale during renewaL•
A. Small MunicipalitvExematian: TheRationalediscussiononthestormwaterpermittingExemptronsjorSmallMunicipalities
(Secnbn IIl.B) has been changed m include the March /0, 1003 deadline for permit coverage for municipally owned
industries. This did not involve any changes m the permit.
B. Reaaalicatian: Authorization to discharge under thisgeneralpermitwillexpbeonSeptember30,1007.Farcertifications
covering smrmwater discharges only ~.e, the permitiee's individual certification does not indicate that Part I.B of the
permitmustbefollowed), thedeadlineforreapplicationforcontimtedcoverageunderthegeneralpermirhasbeenchanged
to Winery-days prior to permit expiration, or June 30,1007. The due date for permittees certified to discharge stormwater
an process water will remain as J80 days before permit expiration, or March 31, 2007.
C. Aparagraphwasincludedintheintroductorypageexplainingtherightofanypartytoanadjudicatoryhearingcontesting
the renewal ofthis general permit, as per the Colorado Dtschoree Permit Svstem Regulations. Regulation No. 61, (S CCR
1002-61). Hole that this does not providefor an adjudicatory hearingjar a cert~catton issued under this general permit.
D. ImaactedStreamSe rents: Forthisgeneralpermit,anyexistingornewoperationthatdischargestoasegmentthati.rusted
on the Division's 3030 list ojimpacted stream segments may require an individual permit The 303(dj segments are
segments m which water qualityslandards jar one o~ morepollutanls are exceeded.
For most, ifnot all, of the operations that discharge under this permit, there are no monitoring dam m verify the expectation
that These discharges will not impact a listed segment Therefore, jar those facilities that discharge process water m
segmenu on the 303(d) list, thepermittees will be required to perform a one-time analysis upon commencement ofdischarge
for the listed parameters ofconcern to confrrm that stream standards for ikeseparameters are not exceeded in the discharge
concenbations.
Where the receiving water is fncluded on the state's 303(d) list total maximum daily loads (Tb1DLs) are being developed in
accordance with the Division's schedule for TMDL completion. Once a TMDL has been established, if it is necessary to
incorporate limitationsfor ajacilirycertifted under thirgeneralpermit which are bused upon the outcomes of~he TMDL ar
theresu/uofrkeone-time analysis, an indi»dualpermitmaybewrittontoregulatedischatgesfromthisfaciliry. Thejaciliry
would continue m be covered under thrs general permit certifrcation until the individual permit is. issued.
D STORMWATER PROGRAM
As required under the Clean WaterAct amendments of 1987, the Environmental Protection Agency (EPA) has established a framework
forregulatrhgmuntcipalandindustrtalstormwaterdischarges. TliisfiameworldrundeitheNatiana1Po11utantDrschargeElimination
System (NPDES)program. The regulations (40 CFR JT2.26) requirespec~c types ofindustrialfacilities which dischargesrormwater
associated with industrial activity (mdustria! srormwater), to obmin coverage for this discharge under an NPDES permit. Facilities
which discharge industrial stormwater either directly to surface waters or indirectly, through municipal separatestorm sewers, must be
covered by a permit.