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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division
<br />Rationale - Page 2. Permit No. COG-500000
<br />Hi.
<br />Thefederal effluent guidelines thatgovern discharges from sand and gravel miningfacilities (40 CFR 436) control most surface runoff
<br />from mining facilities. However, there are some sources of stormwater from these sites which are not addressed, such as roads and
<br />railroad lines, pond outslopes, inactive loadouts, sites used for storage and maintenance of material handling equipment, etc.
<br />For sand and gravel operations, other mining and quarrying of nonmetallic minerals except fuels, and for asphalt and concrete batch
<br />plants located at such facilities, this general permit will cover both the process water discharges and stormwater discharges. Process
<br />water discharges are addressed under Part LB of the permit; stormwater discharges are addressed under Part 1. C of the permit.
<br />This will eliminate the need for coverage under more than one permit for most such facilities- However, as discussed in Section V.A.2.a
<br />of the Rationale, some facilities may wish to apply for an individual permit instead, in order to take advantage of some federal effluent
<br />guidelines not included here. Additionally, as discussed in Section III.B of the Rationale, the Water Quality Control Division of the
<br />Colorado Department of Public Health and Environment (the "Division') retains the authority to require anyfacility to be covered under
<br />an individual permit.
<br />COVERAGE UNDER THIS PERMIT
<br />A. Industrial Cateeories
<br />The types offacilities covered by this permit include all mining and quarrying of nonmetallic minerals, except fuels. This is the
<br />description of Standard Industrial Classification (SIC) Code 14. Also, stormwaterfrom asphalt and concrete batch plants located
<br />at sand and gravel operations is included here, due to their similarity to the covered mines in pollution potential, and their
<br />function as an adjunct to the mine operations- (The definition of asphalt and concrete batch plants can include the use of
<br />recycled asphalt or concrete) The categories include:
<br />SIC Code Industry Tvne
<br />141 Dimension stone
<br />142 Crushed and broken stone
<br />144 Sand and gravel
<br />145 Clay, ceramic, and refractory minerals
<br />147 Chemical and fertilizer mineral mining
<br />2951 Asphalt batch plants
<br />B. Exemptions for Small Municipalities
<br />SIC Code Industry Type
<br />148 Nonmetallic minerals services, except fuels
<br />(overburden removal, strip mining etc)
<br />149 Miscellaneous nonmetallic minerals, except
<br />fuels (asbestos, gems, fell dirt pits,
<br />graphite, gypsum, peat, pumice, talc, etc)
<br />3273 Concrete batch plants
<br />The Intermodal Surface Transportation Efficiency Act of 1991 Section 1068(c) added an exemption to the stormwater regulations
<br />for municipalities with less than 100, 000 population. The term "municipality" includes cities, towns, counties, special districts or
<br />any entity created by or pursuant to State law.
<br />Stormwater discharges associated with industrial activity (except for airports, steam electric power plants, or uncontrolled
<br />sanitary landfills), that are owned or operated by a small municipality are not required to applyfor or obtain a stormwaterpermit
<br />until March 10, 2003. This exemption is only for discharges of stormwater. (Note: This exemption does not apply to other,
<br />privately owned industries within the same small municipality.)
<br />IV.
<br />CERTIFICATION
<br />A. Permit C2 cations
<br />This permit is made up of several parts, some of which do not apply to all permittees (i.e., while most facilities will require
<br />coverage under the stormwater section LC, many will not require coverage under the process water section LB). Therefore, the
<br />individual certification prepared for each applicant will indicate whether that applicant mustfollow Part LB of the permit. In all
<br />cases (except as noted in Section III. C, above), Part I C must be followed. (In the absence of such indication from the Division,
<br />the permittee will be responsible for determining and then complying with the applicable sections in Part 1.) In addition, all
<br />pgrmittees will be required to comply with Part I, subparts A. D, E and F, and all of Part 11 of the permit.
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