Agenda - 10-14-1993 - D 1 - Laserfiche WebLink

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Phil's Creek and all other tributaries to University Lake are classified as WS-II and are also subject to special nutrient limitations due to a NSW (Nutrient Sensitive Waters) designation. The WS-II classification, as described in Table 3.5, is assigned where a WS-I is not feasible due to the level of existing development. "General" discharge permits and permitted stormwater discharges are allowed. Martin Marietta currently has a National Pollutant Discharge Elimination System (NPDES) General Permit for the American Stone Quarry. National Pollutant Discharge Elimination System (NPDES) General Permit No. NCO2000 has been issued for the American Stone Company Quarry site. The effective date on this permit is September 1, 1992 and allows Martin Marietta Aggregates to continue operation of a treatment system for mine dewatering with discharge of treated wastewater and stormwater from the American Stone Quarry site to receiving waters designated as Phil's Creek. A copy of this permit along with effluent limitations, monitoring requirements, and other conditions can be found in Appendix C of this document. As a condition of the NPDES Permit, Martin Marietta Aggregates shall develop and implement Best Management Practices (BMP's) to ensure that contaminants do not enter surface waters via raw materials, intermediate products, finished products, by-products or waste products located on the site. Implementation of the Erosion and Sedimentation Control Plan and management practices set forth in the mining permit approved by the Division of Land Resources is also considered a requirement of the NPDES permit. Additional requirements of the NPDES permit include that equipment used for the mining activities be operated and maintained such that the pollution (potential or actual) of the surface or ground waters of the State be prevented. The NPDES permit also prohibits the discharge of fuels, lubricants, coolants, hydraulic fluids and other petroleum products to the ground or into surface waters, Within the first 12 months of NPDES permit coverage, all above ground bulk storage of petroleum products and storage of Section 313 Water Priority Chemicals shall have secondary containment devices to prevent leaks and spills from contaminating stormwater runoff. The NPDES General Permit also sets guidelines regarding the minimum monitoring of stormwater discharges, sampling, reporting requirements and records for inspection. These guidelines are described in detail in the National Pollutant Discharge Elimination System (NPDES) General Permit Part 1, Section B included in Appendix C. 3-14 •