PERMFILE61538

• Permit No: C1980005A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: NPDES PERMIT
• Section_Exhibit Name: TAB 7 APPENDIX 7-5
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENT' OF PUBLIC HEALTH AND ENVIRONMENT', Water Quality Comrol Division
Rationale -Page 13, Permit No. CO-0000221

S) General Information: The permittee should read the WE7'resting secrions under Pans /.A.4. and I.A.S. of
the permit carefully. The permit outlines the test requirements and the required follow-up actions the
perminee must take to resolve a toxicity incident. The permitter should read, along with the documems
listed in Parts I.A.4.a, and I.A.S.a. ojthe permit, the Colorado Water Oualirv Comrol Division
Biomanitorine Guidance Documem. dated July 1, 1993. This documem outlines the criteria used by the
Division in such areas as granting relief from WET testing, modifying test methods and changing test
species. The perrnittee should be aware that some of the conditions outlined above may be subject to
cJtange if the farility experiences a change in discharge, as outlined in Part II.A.2. of the permit. Such
changes shall 6e reported to the Division immediately.
6) Eremprion for Surface Runoff Only - Outfal1009.• The discharges from outfall 009 contain surface runoff
solely and do not comain toxic pollutams in toxic amoums. On this basis, WET testing is not a requirement
for this outfall. However, the Division reserves the right to reopen the permit to include WET testing,
should jaciliry conditions change or ij new information becomes available.
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4. Srormwarer Evaluation: Stormwater from active or inactive coo! mining operations that has beers conramirtared by
contact with any overburden, raw material, imermediate products, finished produces, byproducts or waste products
located on the sire of such operations is required to be covered by a Colorado Discharge Permit System (CDPS)
permit in order to be discharged to Waxers aj the Stare. This coverage may be obtained under either a CDPS
Industrial Wastewater Discharge Permit or a CDPS Srormwater Discharge Permit. Seneca Coal Company submitted
an application for a general permit jot Metal Mining for the Seneca Mine Complex on February 23, 1996. This
facility's certification under the general permit became effective on March 22, 1996. The Seneca Mine Complex
certification number is COR-040169.
Since the requirements for stormwattr permits have just recently become effective, the Division's policy is to cover
as many facilities as possible chat are included in the regulations, with general permits. For facilities that also have
individual CDPS permits for discharge of process water, airy applicable srormwaler provisions would then be
included in individual CDPS permits at the time of individual permit renewal or application. The individual permit
for discharge of process water for the Seneca Mine Complex, CDPS permit (No. CO-0000221), will contain
s[ormwater provisions. When this permit becomes effettive, certification COR-040169 will be inactivated. Under
the terms of the combined individual permit (CO-0000221), Seneca Coal Company will be authorized to discharge
stormwater associated with industrial activity imo waters of the State of Colorado.
The rernu and conditions of this permit, as related to stormwater discharges, include.•
a. Seerexation of Srormwater Discharges: Al! discharges covered by the stormwater portion of this permit shall be
composed emirely of stormwater (except as discussed at Part I.D.2.6.9 of the permit). Stormwater which mites
x~ith process water is subject to process water comrols. Discharges Jrom sources other than stosmwater must be
addressed by the process water controls in this CDPS permit,
b. Stormwater Manaeemenr Plans (SWMPs1: The purpose oja SWMP is to identify possible pollutant sources r.har
may contaminate stormx~aler and to set out best management practices that, when implemented, will reduce or
eliminate arsy possible water quality impacts.
A SWMP must be maintained for the Seneca Mine Complex in accordance with good engineering practices. The
plan idemifres potential sources of pollution which may reasonably be expected to affect the quality of
srormwater discharges associated with industrial activity. In addition, the plan describes and ensures the
imp[ememation of practices which are to be used to reduce the pollutants in storrnwater discharges associated
x~ith industrial activity at the jaciliry, and assures compliance with the terms and conditions of this permit.
Seneca Coa! Company must implemem the provisions of the SWMP as a condition of this permit. Convents and
requirements of the SWMP are discussed in the permit ar Part I.D.2.b

c. Compliance Dates: Seneca Coal Company was to have prepared the Seneca Mine Complex SWMP at the time of
application . The plan was to have been implemened by upon issuance of the certification. The SWMP shall be
updated as appropriate.
Certifrcatiort that a ~SWMP was prepared for the Seneca Mine Complex was received by the Division on February
23, 1996.