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COLORADO DEPARTMFM OF PUBLfC HEALTH AND ENV/RONMEM, Water Quality Comm! Division Rationale - Pagt 2. Permit No. COG-Sa0a00 The federal effluent guidelines that govern discharges from sand and gravel miningfacilities (40 CFR 436) control mostsurface rend„ from mining facilities. However, there are some sources of stormwater from these sites which are not addressed, such as roads and railroad lines, pond ouulopes, inactive loadouts, sites used for storage and maintenance of material handling equipment, etc. III. For sand and gravel operations, other mining and quarrying ojnonmetallic minerals except fuels, and for asphalt and concrete batch plane located at such facilities, this general permit will cover both the process water discharges and srormwater discharges. Process water discharges are addressed under Part I B of the permit; stormwater discharges are addressed under Part I C of the permit. This will eliminate the need for coverage under more than one permit for most such facilities. However, as discussed in Section Y.A.2. a of the Rationale, some facilities may wish to apply for an individual permit instead, in order to take advantage ofsomefederal effluent guidelines not included here. Additionally, as discussed in Section IIIB of the Rationale, the Water Quality Control Division of the Colorado Department of Public Health and Environment (the 'Division') retains the authority to require anyfaciliry to be covered under an individual permit. COVERAGE UNDER THIS PERMIT A. Industrial Categories The types offacilities covered by thispermit include all mining and quarrying of nonmetallic minerals, except fuels. This is the description of Standard Industrial Classification (SIC) Code 14. Ako, srormwaterfrom asphaltand concrete batch plarsts located at sand and gravel operations is included here, due to their similarity to the covered mines in pollution potential, and their function as an adjunct to the mine operations. (The defznidon of asphalt and concrete batch plants can include the use of i, recycled asphalt or concrete.) The categories include.• SIC Code Industry Type /41 Dimension stone 142 Crushed and broken stone 144 Sand and gravel 145 Clay, ceramic, and refractory minerals 147 Chemical and fertilizer mineral mining 2951 Asphalt batch plants B. Exemptions for Small Municipalities SIC Code IndusrrvType 148 Nonmetallic minerals services, except fuels (overburden removal, strip mining, etc.) 149 Miscellaneous nonmetallic minerals, except fuels (asbestos, gems, fill dirt pie, graphite, gypsum, peat, pumice, talc, etc.) 3273 Concrete batch plants The Intermodal Surface Transportation Efficiency Act of1991 Section 1068(c) added an exemption to thestorntwater regulation far municipalities with less than 100,000 population. The term "municipality" includes cities, towns, counties, special districts of any entity created by or pursuant to State law. Stormwater discharges associated with industrial activity (except for airports, steam electric power plants, or uncontrolled sanitary landfalls), that are owned or operated by a small munictpaliry are not required to applyfor or obtain a stormwater permit until March 10, 2003. This exemption is only for discharges ofstormwarer. (Note: This exemption does not apply to ocher, privately owned industries within the same small municipality.) IV. CERTIFICATION A. Permit Certifications This permit is made up of several parts, some of which do not apply to a1! permittees (i.e., while most facilities will requirr coverage under the stormwater section I C, many will not require coverage under the process water section I.B). Therefore, thr individual certification prepared for each applicant will indicate whether that applicant must follow Pan IB ofthe permit. In alt cases (except as noted in Section III. C, above), Part LC must be followed. (In the absersce ofsuch indication from the Division, the pennittee will be responsible for determining and then complying with the applicable sections in Part 1.) In addition, alt permittees will be required to comply with Pan I, subparts A, D, E and F, and a!1 of Part II of the permit.