2023-01-04_PERMIT FILE - M2022013 (22)

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PART Page 5 of 67 Permit No.: COG500000 PART I A. COVERAGE UNDER THIS PERMIT — Process water and stormwater 1. Activities Covered This permit authorizes the discharge of process water and stormwater runoff to surface waters of the state,from active and inactive eligible facilities engaged in mining and processing of sand and gravel (and other nonmetallic minerals,except fuel). Such facilities are described by Standard Industrial Classification (SIC)Code Major Group 14, unless a specific SIC code is made ineligible under Part I.A.2. of this permit. Appendix A provides a description of SIC Code Major Group 14 facilities. This permit also authorizes the discharge of stormwater runoff to surface waters of the state from the following non-mining activities that are located at sand and gravel facilities:asphalt batch plants(SIC code 2951),concrete batch plants(SIC Code 3273),and asphalt and concrete recycling industrial activities. This permit contains both process water and stormwater provisions,as follows: • Applicable to ALL discharges: Parts LA, 1.8, I.D, LE, and LF, Part 11, Part 111,and all Appendices • Applicable to process water discharges,only: Part I.C.1 • Applicable to stormwater discharges,only: Part I.C.2 and Parts LG through Q a. Eligible Process water discharges: Process water discharges from facilities that produce the commodities listed below are specifically eligible for coverage under this permit. • Dimension stone (SIC code 1411) • Kaolin and Ball Clay(SIC code 1455) • Crushed stone (SIC code 1422, 1423, 1429) • Clay,Ceramic,and Refractory Minerals, Not Elsewhere • Construction sand and gravel (SIC code 1442) Classified (SIC code 1459) • Industrial sand (SIC code 1446) • Graphite(SIC code 1499) The following process water discharges are eligible for coverage under this permit, unless made ineligible under Part I.A.2,: i. mine dewatering,which includes: • any water, including groundwater,seepage, and stormwater(precipitation and surface runoff),that is impounded or that collects in the mine pit(surface or underground workings)and is pumped,drained,or otherwise removed from the mine through the efforts of the mine operator; • additionally,for construction sand and gravel facilities and industrial sand facilities only,wet pit overflow caused solely by direct rainfall and/or groundwater seepage. ii. process generated wastewater,which includes any wastewater used in slurry transport of mined materials,air emissions control,and processing exclusive to mining(40 CFR Part 436); iii. water used in sand and gravel processing(e.g.,sorting,screening,crushing,and classifying); iv. stormwater runoff that becomes comingled with the above listed wastewaters before the discharge point. b. Eligible Stormwater discharges: Stormwater discharges from all SIC Major Group 14 facilities,and from asphalt batch plants(SIC code 2951);concrete batch plants(SIC code 3273); and asphalt and concrete recycling activities conducted at such facilities, are eligible for coverage under this permit. Please see Appendix C- Definitions for how the terms'asphalt batch plant'and 'asphalt concrete'are used in this permit. Stormwater discharges from the following areas at all SIC code Major Group 14 facilities are eligible for coverage under this permit unless made ineligible under Part I.A.2: