2016-08-29_PERMIT FILE - C1981035A (3)

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COLORADO DEPARTMENT OF PUBLIC HLUTH AND ENI7RONMENT, Water QtoUW C xWW DWNat Ra*aak, Pagr.1. COG 500M Said ad Grnwl Gamml Pemt RATIONALE FIFTHRENEWAL CDPS GENERAL PERMIT NO. COG - 0500000- SAND AND GRAVEL PRODUCHON OPERATIONS (AND OTHER NONMETALLICAIINERALSEXCEPTFUEL) ANNUAL FEE $270, CATEGORY 07 SUBCATEGORY lA (EFFEC77VE JULY 1, 2007) L INTRODUCTION This is tlte, f fifth renewal of the general permit for sand and gravel (and other nonmetallic minerals) discharges (COQ - 0500000) to surface waters. This permit is for the regulation of stormwater runoff and process water discharges. Changes have been made to incorporate additional categories of miningfacilides under this general permit. IL GENERAL PERMIT SCOPE A. Applicability This general permit authorizes Stormwater and Process water discharges for the following types of facilities: Mining and quarrying of nonmetallic minerals, except fuels; Standard Industrial aass&adon (SIC) Code 14. Asphalt (SIC 2951) and concrete batch plants (SIC 3273) and recyecling activities located at sand and gravel operations (Batch plants can include the use of recycled asphalt or concrete) This general permit does not cover stormwater only discharges, which are covered under stormwater permit COR- 340000. Tunas of Non» eeoft Mlxerel A t for and Processing - This general permit (COG-0500000) authorizes the discharge of wastewater and stvrmwater from the following categories of nonmetallic mineral mining and processing, as defined in 40 CFA Part 436: Crushed Stone rt W-means process wastewater generated during the mining or quarrying and processing of crushed and broken stone and rip rap. This includes all types of rock and stone, rock and stone that is crashed or broken prior to the extraction of mineral, which is covered elsewhere The processing of calcite, however, in conjunction with the processing of emshed and broken limestone or dolomite is included Coffin Sand and Gravel (Su rt C) — means process wastewater generated during the mining and processing of sand and gravel for construction or fill uses. ft&zha Rock rt R )-means process wastewater generated by the mining or quarrying ofphosphate bearing rock, ore, or earth, for the phosphate content Industrial Sand [Subpart D)-means process wastewater generated during the mining andprocessing of sand and gravel far uses other Man construction and fdl. These uses include, but are not limited m, glassmraking, molding, abrasives, filtration, refractories, and refractory bonding. Graphite 6WWAV -means process wastewater generated during the mining and processing of naftoully occurring grwphite- Batch Plants (QK= or Hot Asphalt) -means process wastewater generated during the mixing process. This also includes the associated truck and drum wash area for concrete facilities, and the wet scrubber discharge from hot asphalt plants. All references to sand and gravel will include the other non - metallic minerals (except fuels), unless specyfcally exempted Thu general permit will cover both the process water discharges and stormwater discharges for sand and gravel operations including asphalt and concrete batch plants and recycling activities located at such facilities. Process water discharges are addressed under Part LB of the permit, stormwater discharges are addressed under Part 1. C of the permit Due to the potential toxicity and wide variety of pollutants, the minimal operations in Colorado, and some categories with provisions difficult to incorporate into a general permit, Mineral mining and processing point sowre category - 40 M 436 - subparts E (gypsum), F (asphaltic mineral), G (asbestos and wollastonite), J (barite), X (fluorspar), L (salines from brine lakes), M (borax), N (potash), O (sodium sulfate), S (Frasch Sulfer), V (benton tie), W (magnesite), X (diatomite), Y (jade), Z (novaculite), and AF (tripoli,). will not be covered under this general permit.