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HomeMy WebLinkAboutNCG020793_COMPLETE FILE - HISTORICAL_201511180 STORMWATER DIVISION CODING SHEET NCG PERMITS PERMIT NO. C)�ro DOC TYPE HISTORICAL FILE ❑ MONITORING REPORTS DOE DATE ❑ ao I 5 I YYYYMMDD r North Carolina Department of Environmental Quality Pat McCrory Governor Andrew Bradley Unimin Coporation 258 Elm Street New Canaan, CT 06840 Dear Mr. Bradley: Donald R. van der Vaart Secretary November 16, 2015 RECE Eb NOV 18 2015 CENTRAL FILES DWR SECTION Subject: General Permit No. NCG020000 Unimin Corporation Quartz Operation COC NCG020793 Mitchell County In accordance with your request for a discharge permit received on May 30, 20.14, we are forwarding herewith the subject certificate of coverage to discharge under the subject state — NPDES general permit. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the US Environmental Protection Agency dated October 15, 2007 (or as subsequently amended). Please take notice that this certificate of coverage is not transferable except after notice to the Division of Energy, Mineral, and Land Resources. The Division may require modification or revocation and reissuance of the certificate of coverage (COC). Coverage under this General Permit for this particular facility is granted with the condition that the permittee performs additional sampling requirements as outlined in the amended conditions to the COC. These special provisions were prompted by results of sampling at this facility during the week of June 8, 2015, as requested by EPA Region 4 staff who performed a Compliance Sampling Inspection (CSI) at the end of March 2015. Sample concentrations raised concerns about metals levels in the discharges. The DEQ concluded that more data was needed to evaluate these discharges and potential water quality impacts. The additional provisions for this COC include: 1) In addition to the parameters in NCG020000, sample each stormwater discharge outfall (SDO) quarterly for five metals, fluoride, chloride, and total hardness listed in Table 1 as amended on page 2 of the COC. Benchmark values apply for many of these added parameters, and the permittee must follow tiered responses as outlined in the permit. 2) In addition to the parameters in NCG020000, sample each wastewater discharge quarterly for five metals, fluoride, chloride, and total hardness listed in Table 7 as amended on page 3 of the COC. Division of Energy, Mineral, and Land Resources Energy Section - Geological Survey Section • Land Quality Section 512 North Salisbury Street, Raleigh, North Carolina 27604 - Internet: http:llportal.ncdenr.org/web/Ir/ Mailing Address: 1612 Mail Service Center, Raleigh, North Carolina 27699-1612 - 919-707-92001 FAX: 919-715-8801 An Equal Opportunity I Affirmative Action Employer — 50% Recycled 1 10% Post Consumer Paper NCG020793 Renewal COC November 16, 2015 Page 2 These additional parameters include metals and other constituents which may be present or will help us interpret the measurements (such as estimating the amounts of metals that are in dissolved form). The Division will consider the data upon submittal to determine the most appropriate permitting actions. It is possible that this facility will be directed to apply to the Division of Water Resources (DWR) for an individual NPDES discharge permit (or modification of its existing wastewater individual permit) prior to the expiration of this General Permit in 2020. This permit does'r* t affect the legal requirements to obtain other permits which may be required by the Division of Energy, Mineral, and Land Resources, or permits required by the Division of Water Resources (DWR), Coastal Area•Management Act, or any other federal or local governmental permit that may be required. If the conditions as stipulated in the COC are unacceptable to you, you may apply sooner for an individual NPDES discharge permit. If you have any questions concerning this permit, please contact Bradley Bennett at telephone number (919) 807-6378, or Bethany Georgoulias at telephone number (919) 807-6372. Sincerely, -1�w ram` for Tracy E. Davis, P.E., CPM cc: Toby Vinson, DEMLR Land Quality Section Tom Belnick, DWR Water Quality Permitting Section Stan Aiken, DEMLR Asheville Regional Office RE Linda Wiggs, DWR Asheville Regional Office Kip Tyler, EPA Region IV NPDES Permitting and Enforcement Branch Stormwater Permitting Program Files DWR Central Files STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES GENERAL PERMIT NO. NCG020000 CERTIFICATE OF COVERAGE No. NCG020793 STORMWATER AND WASTEWATER DISCHARGES NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, and the North Carolina Administrative Code in NCAC 15A 02H .0114(b)(1), as amended, Unimin Corporation is hereby authorized to discharge stormwater and wastewater from a facility located at Unimin Corporation Quartz Operation 7638 NC Hwy 226 S Spruce Pine Mitchell County to receiving waters designated as Bear Creek, Little Bear Creek, and the North Toe River, a class C;Tr water in the French Broad River Basinjn accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts 1, II, 111, and IV of General Permit No. NCG020000 as attached, and as amended in pages 2-3 of this Certificate of Coverage. Amended conditions 1. This Certificate of Coverage (pp. 1-4) is an enforceable part of the permit. 2. In accordance with 15A NCAC 02H .0114(b)(1), the monitoring program in Part IV Section A, Table 1 Analytical Monitoring Requirements for Stormwater from Mining Activities, and Section D, Table 7 Monitoring Requirements for Wastewater Discharges of this permit are amended as follows: Table 1. Analytical Monitoring Requirements for Stormwater Discharges from Mining Activities Discharge Characteristics Units Measurement Fre uenc 1 Sample TypeZ Sample Location3 Benchmark, Settleable Solids MI/1 Quarterly Grab SDO 0.1 ml l Total Suspended Solids mg/1 Quarterly Grab SDO 50 mg/1 Turbidi 4 NTU Quarterl Grab SDO, U & D4 10 NTU Aluminum, Total Recoverable5 mg/1 guarterly Grab SDO 0.75 mg/1 Copper, Total Recoverable5 mg/1 I QuarterlyGrab SDO 0.010 m 1 Lead, Total Recoverable5 mg/1 guarterly Grab SDO 0.075 mg/1 Nickel, Total Recoverable5 mg/1 Quarterly Grab SDO 0.335 mg/1 Zinc, Total Recoverable5 mg/1 guarterl Grab SDO 0.126 mg/1 Total Chlorides m 1 guarterly Grab SDO 860 m Total Fluorides mg/1 I QuarterlyGrab SDO 6 m Total Harness as CaCO3 5 I mg/1 Quarterly I Grab I SDO N/A Total Rainfall6 inches Quarterl -- -- N/A Footnotes: 1. Measurement Frequency: Quarterly (unless other provisions of this permit require monthly sampling) during a measureable storm event, until either another permit is issued for this facility or until this permit is revoked or rescinded. If the facility is monitoring monthly because of Tier Two or Three response actions under the previous General Permit, the facility shall continue a monthly monitoring and reporting schedule in Tier Two or Tier Three status until relieved by the provisions of this permit or the Division. 2. Grab samples shall be collected within the first 30 minutes of discharge. Where physical separation between outfalls prevents collecting all samples within the first 30 minutes, the permittee shall begin sampling within the first 30 minutes, and shall continue until completed. 3. Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) unless representative outfall status (ROS) has been granted. A copy of the Division's letter granting ROS shall be kept on site with the SPPP. 4. Turbidity must be monitored at the stormwater discharge outfall (SDO). In addition to the SDO, the permittee may elect to also monitor turbidity in the receiving water, directly upstream (U) and downstream (D) of the stormwater discharge outfall or group of outfalls to demonstrate the discharge has not caused a water quality standard violation of turbidity. If SDO turbidity level exceeds the benchmark, and the permittee cannot demonstrate the discharge has not caused a violation of the instream water quality standard, the Division may require the permittee to monitor turbidity up - and downstream as part of a Tier 2 or 3 response. S. Benchmark values apply for these parameters and prompt Tier responses as outlined in the General Permit. Benchmark values for metals are based on one half the Final Acute Value (1/2 FAV), a threshold used to protect against acute impacts to aquatic life. 6. For each sampled measureable storm event the total precipitation must be recorded. An on -site rain gauge or local rain gauge reading must be recorded. 2 f COC No. NCG020793 effective November 16, 2015 Table 7 Monitoring Require ents for Wastewater Discharges in Section D -1., 2., 3., & 4. Discharge Characteristics Units Measurement Fre uenc l Sample Type Sample Location3 Receiving Waters H2 Standard Quarterlyl Grab E All Total Suspended Solids2.4 mg/I Quarterly] Grab E All Turbidit 2, 3 NTU guarterlyl Grab E, U & D3 All Settleable Solids2, 5 ml/1 Quarterly] Grab E HQW, ORW, SA, SB, PNA, Tr Aluminum, Total Recoverable6 Mg1l Quarterl l Grab E All Copper, Total Recoverable6 m 1 guarterlyl Grab E All Lead, Total Recoverable6 mg/1 Quarterlyl Grab E All Nickel, Total Recoverable6 Mg/1 Quarterl l Grab E All Zinc, Total Recoverable6 m I Quarterl l Grab E All Total Chloride6 m I quarter] l Grab E All Total Fluoride6 mg/1 Quarterl l Grab E All Total Harness as CaCO3 6 rngJ1 Quarterlyl Grab E All Daily Flow Rate? cfs Quarterlyl - E All Footnotes: 1. The monitoring frequency is quarterly. 2. Except for mine dewatering of clay pits, a grab sample is not required for these parameters from a basin/pond designed to contain or treat mine dewatering wastewater that only discharges in response to rainfall in excess of the 10-yr, 24-hr storm. 3. Sample Location: E - Effluent, U - Upstream, D - Downstream. Turbidity must be monitored at the effluent (E). if effluent levels exceed the Water Quality Standard of the receiving water, the permittee must begin sampling turbidity directly upstream (U) and downstream (D) of the effluent outfall or group of outfalls, in addition to the effluent, upon the next monitoring period. The permittee may contact the DEMLR Regional Office for assistance in determining the best instream sample points. The RO may also advise the permittee to relocate self -established instream sample points if appropriate. 4. All facilities that are mining Industrial Sand are required to monitor TSS and are subject to the TSS limits in Table 8. All other types of mines covered by this permit are also required to monitor TSS, but are not necessarily subject to the TSS limits in Table 8, unless discharge is to HQW, ORW, or PNA waters. 5. Only facilities discharging to waters classified as HQW, ORW, SA, SB, Tr, or PNA are required to monitor for settleable solids. 6. No effluent limitation applies to these parameters. 7. Daily flow rate shall be recorded by a continuous flow measurement instrument. Alternatively, pump curves and pump logs may be used as a means to calculate the daily flow rate. 3 I COC No. NCG020793 effective November 16, 2015 This Certificate of Coverage shall become effective November 16, 2015. This Certificate of Coverage shall remain in effect for the duration of the General Permit. Signed this day, November 16, 2015. for Tracy E. Davis, P.E., Director Division of Energy, Mineral, and Land Resources By the Authority of the Environmental Management Commission 4 ! COC No. NCG020793 I effective November 16, 2015