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Home My WebLink AboutNC0000175_Approval - Correction_20081016�0F WATF90 �0 �? r o � October 16, 2008 Mr. Andrew Bradley Unimin Corporation P.O. Box 588 Spruce Pine, NC 28777 Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Coleen H. Sullins, Director Division of Water Quality Subject: Permit Correction of Unimin Corp. WWTP NPDES Permit NC0000175 Mitchell County Dear Mr. Bradley: Division personnel have reviewed and corrected parts of your existing NPDES Permit to address ongoing reporting difficulties. The permit corrections will allow Mine Dewatering values to be entered into the Divisions database (BIMS) to reflect ongoing compliance at your facility. These permit corrections are as follows: ➢ Part 2 of your "Supplement to permit cover sheet" will read as follows, Discharge process wastewater from mineral extraction of ore through outfall 001, mine dewatering and/or overflow from facilities that recycle process wastewater through outfall 002, and stormwater through outfalls HAW01, HAW03, and SC5 through SC8 at the locations specified on the attached map into the North Toe River, which is classified C Trout waters, in the French Broad River Basin." ➢ Table 3; "Effluent Limitations and Monitoring requirements for Mine Dewatering wastewater", will read as follows, During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge mine dewatering and/or overflow from facilities that recycle process wastewater from outfall 002. Such discharges shall be limited and monitored by the Permittee as specified below ": ➢ Table 3 Footnotes #1, #2 and #5 have been deleted or incorporated into Table 3. We are forwarding you the new Supplemental to Permit Cover page and the new Table 3, "Effluent Limitations and Monitoring requirements for Mine Dewatering wastewater". You should replace your existing Supplemental to Permit Cover page and your existing Table 3, Effluent Limitations and Monitoring requirements for Mine Dewatering wastewater pages from your current permit with these two pages. This permit correction is issued pursuant to the requirements of North Carolina General Statute 143 -215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended). If any parts, measurement frequencies or sampling requirements contained in this permit correction are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699 - 6714). Unless such demand is made, this decision shall be final and binding. Please note that this permit is not transferable except after notice to the Division. The Division may require modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to obtain other permits which may be required by the Division of Water Quality or permits required by the Division of Land Resources, the Coastal Area Management Act or any other Federal or Local governmental permit that may be required. If you have any questions concerning this permit, please contact Bob Guerra at telephone number (919) 807 -6387. S' reI , C en H. lins NC0000175 Modified pages tx: Asheville Regional Office /Surface Water Protection Mr. Jeffery Ferguson / Unimin Corporation PO Box 588, Spruce Pine, NC 28777 Aquatic Toxicology NPDES File /NC0000175 Central File Maitlng Address Plane (919) 807 -6300 Location 1617 Mail Service Center Fax (919) 807 -6492 512 N. Salisbury St Caro ina Raleigh, NC 27699 -1617 Rakigh, NC 27664 Ru!'a Iy Internet: www.acwateramlkv.org Customer Service 1- 877 -623 -6748 An Equal Opportunity/AKrmalve kbon Employer - 50% Recycledll0% Post Consumer Paper . ,.. , Permit NC0000175 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as of this issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. Unimin Corporation is hereby authorized to: 1. Continue operation of a wastewater treatment plant for process wastewater from mineral extraction consisting of: • Dewatering cyclones; • Screw classifier; • Vacuum filters; • Alum, lime and polymer addition; • Jadar solids removal system; • Stabilization ponds; • pH addition; • Emergency pond; • Mix/reactor tanks; • Thickener; • Multimedia filter • Filter press, and • Flow measurement The facility is located at the Quartz Feldspar Operation, off NC Highway 226, Spruce Pine, Mitchell County, and; 2. Discharge process wastewater from mineral extraction of ore through outfall 001, mine dewatering and/or overflow from facilities that recycle process wastewater through outfall 002, and stormwater through outfalls HAW01, HAW03, and SC5 through SC8 at the locations specified on the attached map into the North Toe River, which is classified C Trout waters, in the French Broad River Basin. Permit NC0000175 PART I. SECTION D EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FOR MINE DEWATERING WASTEWATER AND PROCESS WASTEWATER 1. Mine Dewatering Wastewater (including Borrow Pits) During the period beginning on the effective date of the permit and lasting until expiration, the permittee is authorized to discharge mine dewatering wastewater controlled in accordance with the conditions of this permit. Mine dewatering activities that have the potential to drain wetlands must have secured and implemented an Operation and Monitoring Plan approved by the Division. Operation and Monitoring Plans shall include, but are not limited to: • Groundwater monitoring strategies to demonstrate the effect of pumping and, as necessary, establish the pumping regime necessary to reduce impacts. • Detailed plans to maintain the surrounding hydrology and the respective monitoring to demonstrate compliance. Alternative site specific pumping and monitoring regimes may be approved by the Division on a case -by -case basis. The discharge of Mine dewatering wastewater that is directly pumped from the pit through an erosion and sedimentation control structure prior to discharging to surface waters is not required to receive an authorization to construct. Mine dewatering wastewater discharges which requires additional treatment other than erosion and sedimentation control structures are subject to the authorization to construct requirement. Analytical monitoring of mine dewatering wastewater shall be performed as specified below in Table 3. An exceedence of any of these limitations is a violation of the permit conditions and may be subject to enforcement action. Table 3. Effluent Limitations and Monitoring Requirements for Mine Dewatering Wastewater: Outfall 002 During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge mine dewatering and/or overflow from facilities that recycle process wastewater from outfall 002. Such discharges shall be limited and monitored by the Permittee as specified below: Footnotes: 1. Total flow shall be continuous flow measurement. Alternatively, pump curves and pump logs may be used as a means to calculate flow volume. 2. Total Suspended Solids limits for Industrial Sand Mining. Effluent Limitations Monitoring Requirements Parameter Monthly Maximum Measurementl Sample Sample Average (Daily Frequency Z l Location Total Flow' Effluent Settleable Solids 0.1 rnVL 0.2 mVL Monthly Grab Effluent Turbidity 10 NTU Monthly Grab Effluent Total Suspended Solids2 25.0 mg/L 45.0 mg/L Monthly Grab Effluent pH > 6.0 and < 9.0 standard units Monthly Grab Effluent Footnotes: 1. Total flow shall be continuous flow measurement. Alternatively, pump curves and pump logs may be used as a means to calculate flow volume. 2. Total Suspended Solids limits for Industrial Sand Mining. 211 P, Admik mm'- Kruger 14W v� w 7V Ae�� 4 r - OVV 4. h /ow 06 Fill � J 740, Niw Zdos 1�iiw�C, /�oo7 J Al I — I -- — — I I i I i