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HYDRO26170
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Entry Properties
Last modified
8/24/2016 8:45:41 PM
Creation date
11/20/2007 6:21:58 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981013
IBM Index Class Name
Hydrology
Doc Date
7/28/2002
Doc Name
NPDES Certification
From
CDOH WQCD
To
Basin Resources
Permit Index Doc Type
NPDES
Media Type
D
Archive
No
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RATIONALE <br />THIRD RENEWAL <br />CDPS GENERAL PERM/T <br />FOR COAL MIN/NG FACILITIES (SURFACE R UNOFF ONLY) <br />CDPS NO. COG-850000 <br />'~anges to this general permit upors the third renewal are relatively minor in nature. <br />1. The discharge language from past revisions did not consider discharges to land. In this renewal, land application language is included <br />2. AntidePradation--The Division reviewed this renewal permit for compliance with antidegradation regulations. No limitations have changed. <br />thus there is no increase in loading from those facilities with continuing coverage under the general permit, and any new source, or <br />discharger covered under this permit would not be expected to approach the remaining assimilative capacity. Additionally, discharges <br />authorized under this permit are not expected to occur during low flow conditions, they typically occur when stream flows are high due to <br />storm events. It is the Division's determination that antidegradation does not apply to this permit. <br />3. Western Alkaline Mining & Coal Remining operations are excluded om coverage under this general permit. These two new subcategories <br />were recently published in the Federal Register on January 23, 2002. Due to ihespecial requirements that both operations require, it would <br />be more appropriate to be covered under an individual permit. The subcategoryfor Coal Remining applies topre-existing discharges that are <br />located within, or that are hydrologically connected to, pollution abatement areas ofa coal remining operation. The Western Alkaline Coal <br />Miningsubcategoryestoblishes effluent limitations and performancestandards for alkaline mine drainagefrom reclamation areas, brushing <br />andgrubbingareas,topsoi/stockpiling areas, and regraded areas at westerncoalminingoperations. Westerncoalminingisdefinedasa <br />surface or underground coal mining operation located in the 100th meridian west longitude, in an acid or semi-arid environment with an <br />average annual precipitation of 26.0 inches or less. If in the future, the Division deems it necessary to add provisions to cover these two <br />subcategories, this general permit will be reopened to add conditions and monitoring requirements that address the new subcategories. <br />See previous permit rationale for changes that occurred since the original general permit was conceived. <br />Christopher L. Gates <br />February 19, 2002 <br />COMMENTS MADE D URING PUBLIC NOTICE <br />The Environmental Protection Agency made the following comments, with the Division's response, if arty, in bold. <br />rationale needs to explain how new discharges and/or new sources will be covered under the permit and how the addition of those new <br />sources/discharges will satisfy the State's Antidegradation Policy. Ifnew sources are to be covered, the effluent limits table must contain New <br />Source Performarsce Standards (NSPS) limiu for total Iron. <br />The Division included additionallanguage in the rationale to address new or increased discharges, stating that there is no increased loadfram <br />existing discharges and any new source or discharger would not be expected to approach the remaining assimilative capacity. The new or <br />increased discharges will have to comply with the NSPS limit for iron. <br />Federal effluent guidelines for total manganese limits have been omined from the renewal permit. Please review 40 CFR Part 434 Coal Mining <br />and irssert manganese limits where applicable. <br />Federal effluentguidelinesfor total manganese limits havebeen added to cover acid orferruginous mine drainage and coal phtntpreparation <br />activities that would normally be covered under this general permit <br />Lastly, the stormre(ateddischargelimitationsandrequirementsvaryfromthestormdischargerequirementsfoundunder40CFR,¢434.63. Please <br />review the requirements under 40 CFR Part 434 and revise appropriately. <br />Changes were made to be consistent with 40 CFR § 434.63 for storm related activities. <br />During the comment review, it was made known by the EPA that two new subcategories were recently published in tke Federal Register on <br />January 23, 2002. These two subcategories are for coal remining operations and western alkaline mining. These subcategories shall be <br />mentioned here, but will be excluded from coverage from this genera! permit due to the special requirements that would be better covered <br />under an individual permit The subcategory for Coal Remining applies to pre-exisnieg discharges that are located within, or that are <br />hydrologically connected to, pollution abatement areas of a coal remining operation. The Western Alkaline Coa[ Mining subcategory <br />establishes effluent [imitations and performance standardsfor alkaline mine drainage from reclamation areas, brushing and grubbing areas, <br />topsoil stockpiling areas, and regraded areas at western coal mining operations. Western coal mining is defined as a surface or underground <br />coal mining operation located in the I00`"meridian west longitude, in an arid or semi-arid environment with an average annual precipitation <br />r `'ti.0 inches or less. If in thejuture, the Division deems it necessary to add provisions to cover these two subcategories, this genera[ permit <br />be reopened to add conditions and monitoring requirements that address the new subcategories. <br />Christopher L. Gates <br />June 5, 2002 <br />
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