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EzhibitG GCC will apply for a General Permit for discharges associated with heavy industrial activity (COR- • 020000) at ]east 30 days prior to the first stormwater discharge associated with heavy industrial activity. GCC currently has a stormwater permit for discharges associated with sand and gravel operations (COG- 500377 -renewed in Mazch 2002). In order to cover stormwater discharges associated with industrial activity at the Portland cement manufacturing plant, the heavy industrial stormwater permit will replace the sand and gravel permit as the active stormwater permit at the site. The heavy industrial permit requires that a SWMP be completed prior to submission of the application and that the SWMP be implemented and updated as needed. This permit requires that a grab sample be taken annually. The sample will be analyzed for pH, total suspended solids (TSS), oil and grease, chemical oxygen demand (COD) and, potentially, blasting residuals. The results will be presented in an annual report. WATER QUANTITY The facility requires approximately 379 acre-feet per year; two-thirds for the plant and offices and one- third for dust control in the surface mine. Rio Grande, through the State Land Board, has obtained three well permits from the State Engineers Office for withdrawing nontributary groundwater. The three well permits allow withdrawal of groundwater totaling 228.3 acre feet per year. Rio Grande is negotiating a lease with the Pueblo Board of Water Works which contemplates Rio Grande leasing 250 acre feet per year of water for the facility. The Pueblo Board of Water Works approved the lease of water to GCC Rio Grande, Inc., by Board Motion on June 20, 2000 (Attached as Appendix I). Further, Rio Grande is studying the availability of groundwater in the project area, facility design in order to transport water, and ways in which discharges from the project can be minimized in order to avoid impacts to the surface water systems in the area. Rio Grande's water supply system will meet its needs for mining, production and minimizing dust emissions while protecting these water resources. • "WATERS OF THE U. S."/WETLANDS Rio Grande submitted a request to the Army Corps of Engineers for a jurisdictional determination concerning certain lands on the Pueblo property under the federal Clean Water Act (CWA). The determination request sought confirmation of Rio Grande's detailed technical assessment that the Rio Grande project did not affect any potential wetlands within the proposed project azea- which consisted of abridge crossing corridor over the St. Charles River located in Township 22 South, Range 64 W, Section 18, and Township 22 South, Range 65 W, Sections 1, 12, and 13. Rio Grande received confirmation from the Army Corps of Engineers on December 6, 2001, that the project area does not contain any wetlands areas subject to regulation by the Army Corps of Engineers under the CWA. Thus, no wetlands mitigation programs or permits need to be sought in order for the project to proceed. Engineering options aze under development for a bridge over the St. Charles River. If an engineering option selected further involves the Army Corps of Engineer's CWA jurisdiction, Rio Grande will seek the necessary approvals. If an engineering option exists that does not involve the Army Corps of Engineers, Rio Grande will also seek the Corps' review and concurrence. SURFACE WATER MANAGEMENT PLAN The SWMP is detailed in Appendix F. Surface water will be managed prior to mining, during mining, and after reclamation using several methods and temporazy or permanent facilities. Exhibit D-2 provides an overview of the proposed storm water management facilities, showing how runoff water will be managed to protect against pollution of surface and groundwater sources. The Exhibit shows the locations of in-pit sedimenUdetention ponds, clear-water diversions for the mine and plant site, arroyo protection • measures, reconstructed arroyos, culverts for the access road and railroad spur, sediment and detention 1180.Mine Permi[ Exhibits (Ju1.05.02)FINAL.doc G_3 July 8, 2002