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HomeMy WebLinkAboutNCS000315 04-2009 Final PermitWA Ak•. 11C DENR North Carolina Department of Environment and Natural RPSOurces Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Governor Director April 3, 2009 Ms. Linda Denison Ashland Inc. PO Box 2219 Columbus, Ohio 43216 Subject: Final NPDES Stormwater Permit Permit No. NCS000315 AsIdand Distribution Mecklenburg County Dear Ms. Denison: Dee Freeman Secretary In response to your renewal application for continued coverage under NPDES stormwater permit NCS000315, the Division of Water Quality is forwarding herewith the subject state - NPDES 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). This final permit includes no major changes from the draft permit sent to you on February 6, 2009. Your comments have been considered, and where appropriate, minor modifications to the permit have been made. Analytical monitoring is still required in this permit at allstormwater discharge outfalls. During the renewal process, it was noted that facility activities include blending and repackaging along with distribution of many types of organic solvents. Based on this description and the historical onsite chemical releases at your site, the Division considers this facility to be engaged in industrial activity associated with Standard Industrial Classification 28 which is captured by the NPDES program regulated by 40 CFR 122.26. Failure to complete the monitoring as required is a violation of the permit and any permit noncompliance constitutes a violation of the Clean Water Act. Reference Part III, Section A, Item 2 "Duty to Comply", Item 9 "Penalties for Tampering" and Item 10 'Penalties for Falsification of Reports" of your permit for further information. Please note that your facility drains to an area where there are threatened and endangered species. The Carolina Heelsplitter, (Lasrnigona decorata) is an endangered species that has been identified near your facility. Failure to abide by your storm -water permit may constitute violation of the Threatened and Endangered Species Act. If any parts, measurement frequencies or sampling requirements contained in this permit 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 Wetlands and Stormwater Branch 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 1e7One 1 1 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 lv 01'thCarolina Phone: 919-807-63001 FAX: 919-807-6494 \ Customer Service: 1-877-623-6748 ��yrfy`�9 Internet: www.ncwaterquality.org at d y An Eaual O000rtunity \ Affirmative Action Emolover Ms. Linda Denison Ashland Inc. Permit No. NCS000315 Page 2 Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final and binding. Please take notice this permit is not transferable. Part III, B.2, addresses the requirements to be followed in case of change in ownership or control of this discharge. 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, Coastal Area Management Act or any other Federal or Local governmental permit that may be required. If you have any questions or comments concerning this permit, contact Cory Larsen at (919) 807-6365 or cory.larsenCncmail.net cc: Mooresville Regional Office, Dee Browder Mecklenburg County DEP EPA Region IV, Mike Mitchell Stormwater Permitting Unit Central Files Attachments 2 Sincer*JGINAI_ SIGNED BY KEN PICKLE for Coleen H. Sullins, Director NCS000315 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALI'T'Y PERMIT TO DISCHARGE STORMWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with.the provisions 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, as amended, Ashland Inc. is hereby authorized to discharge stormwater from a facility located at Ashland Distribution Co. 3930 Glenwood Dr. Charlotte, NC Mecklenburg County to receiving waters designated as the City of Charlotte Municipal Separate Storm Sewer System (MS4) and Stewart's Creek, a class C stream in the Catawba River Basin, in accordance with the discharge limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, IV, V and VI hereof. This permit shall become effective May 1, 2009. This permit and the authorization to discharge shall expire at midnight on April 30, 2014. Signed this day April 3, 2009. ORIGINAL SIGNED 8Y KEN PICKLE: for Coleen H. Sullins Director Division of Water Quality By the Authority of the Environmental Management Commission Permit No. NCS000315 3. Signatory Requirements 4. Individual Permit Modification, Revocation and Reissuance, or Termination 5. Permit Actions Section C: Operation and Maintenance of Pollution Controls 1. Proper Operation and Maintenance 2. Need to Halt or Reduce Not a Defense 3. Bypassing of Stormwater Control Facilities Section D: Monitoring and Records 1. Representative Sampling 2. Recording Results 3. Flow Measurements 4. Test Procedures 5. Representative Outfall 6. Records Retention 7. Inspection and Entry Section E: Reporting Requirements 1. Discharge Monitoring Reports .2. Submitting Reports 3. Availability of Reports . 4. Non-Stormwater Discharges 5. Planned Changes 6. Anticipated Noncompliance 7. Bypass 8. Twenty-four Hour Reporting 9. Other Noncompliance 10. Other Information PART IV LIMITATIONS REOPENER PART V ADMINISTERING AND COMPLIANCE MONITORING FEE REQUIREMENTS PART VI DEFINITIONS ii SIJ+ CT1ON C: LOCATION MAP Permit No. NCS000315 ►�11 NOP Scale 120,000 Ashland Ashland Distribution Co. Latitude: 350 15' 2.08" N Longitude: 800 53' 11,18" W County: Mecklenburg Receivi ng Stream: Stewarts Creek Stream Class: C Sub -basin: 03-08-04 (Catawba River Basin) Part I Page 2 of 2 Facility Location Permit No. NCS000315 (e) Certification that the storinwater outfalls have been evaluated for the presence of - non-stormwater discharges. The certification statement will be signed in accordance with the requirements found in Part III, Standard Conditions, Section B, Paragraph 5. The permittee shall re -certify annually that the stormwater outfalls have been evaluated for the presence of non-stormwater discharges. 2. Stormwater Management Plan. The stormwater management plan shall contain a narrative description of the materials management practices employed which control or minimize the exposure of significant materials to stormwater, including structural and nonstructural measures. The stormwater management plan, at a minimum, shall incorporate the following: (a) Feasibility Study. A review of the technical and economic feasibility of changing the methods of operations and/or storage practices to eliminate or reduce exposure of materials and processes to stormwater. Wherever practical, the permittee shall prevent exposure of all storage areas, material handling operations, and manufacturing or fueling operations.. In areas where elimination of exposure is not practical, the stormwater management plan shall document the feasibility of diverting the stormwater runoff away from areas of potential contamination. (b) Secondary Containment Requirements and Records. Secondary containment is required for: bulk storage of liquid materials; storage in any amount of Section 313 of Title III of the Superfund Amendments and Reauthorization Act (SARA) water priority chemicals; and storage in any amount of hazardous substances, in order to prevent leaks and spills from contaminating stormwater. runoff. A table or summary of all such tanks and stored materials and their associated secondary. containment areas shall be maintained. If the secondary containment devices are connected directly to stormwater conveyance systems, the connection shall be controlled by manually activated valves or other similar devices (which shall be secured closed with a locking mechanism), and any stormwater that accumulates in the containment area shall be at a minimum visually observed for color, foam, outfall staining, visible sheens and dry weather flow, prior to release of the accumulated stormwater. Accumulated stormwater shall be released if found to be uncontaminated by the material stored within the containment area. Records documenting the individual making the observation, the description of the accumulated stormwater, and the date and time of the release shall be kept for a period of five years. (c) BMP Summary. A listing of site structural and non-structural Best Management Practices (BMP) shall be provided. The installation and implementation of BMPs shall be based on the assessment of the potential for sources to contribute significant quantities of pollutants to stormwater discharges and data collected through monitoring of stormwater discharges. The BMP Summary shall include a written record of the specific rationale for installation and implementation of the selected site BMPs. The BMP Summary shall be reviewed and updated annually. Part II Page 2 of 10 Permit No. NCS000315 effectiveness of the BMPs listed in the BMP Summary of the Stormwater Management Plan. The Director may notify the permittee when the Plan does not meet one or more of the minimum requirements of the permit. Within 30 days of such notice, the permittee shall submit a time schedule to the Director for modifying the Plan to meet -minimum requirements. The permittee shall provide certification in writing (in accordance with Part III, Standard Conditions, Section B, Paragraph 5) to the Director that the changes have been made. 8. Facility Inspections. Inspections of the facility and all stormwater systems shall occur as part of the Preventative Maintenance and Good Housekeeping Program at a minimum on a semi-annual schedule, once during the first half of the year (January to June), and once during the second half (July to December), with at least 60 days separating inspection dates (unless performed more frequently than semi-annually). These facility inspections are different from, and in addition to, the stormwater discharge characteristic monitoring required in Part II B and C of this permit. 9. Implementation. The permittee shall implement the Plan. Implementation of the Plan shall include documentation of all monitoring, measurements, inspections, maintenance activities, and training provided to employees, including the log of the sampling data and of actions taken to implement BMPs associated with the industrial activities, including vehicle maintenance activities. Such documentation shall be kept on-site for a period of five years and made available to the Director or the Director's authorized representative immediately upon request. Part II Page 4 of 10 Permit No. NCS000315 The permittee shall complete the minimum ten analytical samplings in accordance with the schedule specified below in Table 2. A minimum of 60 days must separate Period 1 and Period 2 sample dates unless monthly monitoring has been instituted under a Tier Two response. i axle L. lvlonitoring Schedule Year 1 —Period 1 1 May 1, 2009 October 31, 2009 Year 1 — Period 2 2 November 30, 2009 April 30, 2009 Year 2 — Period 1 3 May 1, 2010 October 31, 2010 Year 2 — Period 2 4 November 30, 2010 April 30, 2010 Year 3 — Period 1 5 May 1, 2011 October 31, 2011 Year 3 — Period 2 6 November 30, 2011. April 30, 2011 Year 4 — Period 1 7 May 1, 2012 October 31, 2012 Year 4 — Period 2 8 November 30, 2012 April 30, 2012 Year 5 — Period 1 9 May 1, 2013 October 31, 2013 Year 5 — Period 2 10 November 30, 2013 April 30, 2014 1 Maintain semi-annual monitoring during permit renewal process. The applicant must continue semi-annual monitoring until the renewed permit is issued. 2 If no discharge occurs during the sampling period, the permittee must submit a monitoring report indicating "No Flow" within 30 days of the end of the six-month sampling period. The permittee shall report the analytical results from the first sample with valid results within the monitoring period. The permittee shall compare monitoring results to the benchmark values in Table 3. The benchmark values in Table 3 are not permit limits but should be used as guidelines for the permittee's Stormwater Pollution Prevention Plan (SPPP). Exceedences of benchmark values require the permittee to increase monitoring, increase management actions, increase record keeping, and/or install stormwater Best Management Practices (BMPs) in a tiered program. See below the descriptions of Tier One and Tier Two, Part II Page 6 of 10 Permit No. NCS000315 If: During the term of this permit, the first valid sampling results are above the benchmark values, or outside of the benchmark range, for any specific parameter at a specific discharge outfall two times in a row (consecutive); Then: The permittee shall: 1. Repeat all the required actions outlined above in Tier One. 2. Immediately institute monthly monitoring for all parameters at every outfall where a sampling result exceeded the benchmark value for two consecutive samples. Monthly (analytical and qualitative) monitoring shall continue until three consecutive sample results are below the benchmark values, or within the benchmark range, for all parameters at that outfall. 3. If no discharge occurs during the sampling period, the permittee is required to submit a monthly monitoring report indicating "No Flow." 4. Maintain a record of the Tier Two response in the Stormwater Pollution Prevention Plan. During the term of this permit, if the valid sampling results required for the permit monitoring periods exceed the benchmark value; or are outside the benchmark range, for any specific parameter at any specific outfall on more than four occasions, the permittee shall notify the DWQ Regional Office Supervisor in writing within 30 days of receipt of the fourth analytical results. DWQ may, but is not limited to: • require that the permittee increase or decrease the monitoring frequency for the remainder of the permit; • require the permittee to install structural stormwater controls; • require the permittee to implement other stormwater control measures; or • require that the permittee implement site modifications to qualify for the No Exposure Exclusion. This site discharges indirectly to impaired waters experiencing problems with Turbidity, Lead and Fecal Coliform. If a Total Maximum Daily Load (TMDL) is approved for this segment of Stewart's Creek, the permittee maybe required to monitor for the pollutant(s) of concern in the future and submit results to the Division of Water Quality. The Division will consider the monitoring results in determining whether additional BMPs are needed to control the pollutant(s) of concern to the maximum extent practicable. Part II Page 8 of 10 Permit No. NCS000315 SECTION D: ON-SITE VEHICLE MAINTENANCE MONITORING REQUIREMENTS Facilities which have any vehicle maintenance activity occurring on-site which uses more than 55 gallons of new motor oil per month when averaged over the calendar year shall perform analytical monitoring as specified below in Table 5. This monitoring shall be performed at all stormwater discharge outfalls which discharge stormwater runoff from vehicle maintenance areas, and in accordance with the schedule presented in Table. 2 (Section B). All analytical monitoring shall be performed during a representative storm event. Table 5. Analytical Monitoring Requirements for On -Site Vehicle Maintenance Discharge Characteristics "j UmtsMeasurement Fre uenc' 1 Sample ,�= T `e? Sample Location3.. pH standard semi-annual Grab SDO Oil and Grease mg/l semi-annual Grab SDO Total Suspended Solids mg/1 semi-annual Grab SDO Total Rainfall4 inches semi-annual Rain gauge - New Motor Oil Usage U....4«..4.. gallons/month semi-annual Estimate - 1 v Measurement Frequency:' Twice per year during a representative storm event, for each year until either another permit is issued for this facility or until this permit is revoked or rescinded. If at the end of this permitting cycle the permittee has submitted the appropriate paperwork for a renewal permit before the submittal deadline, the permittee will be considered for a renewal application. The applicant must continue semi-annual monitoring until the renewed permit is issued. See Table 2 for schedule of monitoring periods through the end of this permitting cycle. 2 If the stormwater runoff is controlled by a stormwater detention pond a grab sample of the discharge from the pond shall be collected within the first 30 minutes of discharge from the pond. 3 Sample Location: Samples shall be collected at each stormwater discharge outfall (SDO) that discharges stormwater runoff from area(s) where vehicle maintenance activities occur. 4 For each sampled representative storm event the total precipitation must be recorded. An on-site or local rain gauge reading must be recorded. Monitoring results shall be compared to the benchmark values in Table 6. The benchmark values in Table 6 are not permit limits but should be used as guidelines for the permittee's Stormwater Pollution Prevention Plan (SPPP). Exceedences of benchmark values require the permittee to increase monitoring, increase management actions, increase record keeping, and/or install stormwater Best Management Practices (BMPs), as provided in Part II Section B. avae U. nencnmarx values for vehicle Maintenance Analytical Mon! DischargeCharacferistics Units Beiichuiark pH standard 6 - 9 Oil and Grease mg/L 30 Total Suspended Solids -7— mg/L 100 Part II Page 10 of 10 toring Permit No. NCS000315 $10,000 per day for each day during which the violation continues, with the maximum amount of any Class II penalty not to exceed $125,000. 3. Duty to Mitigate The permittee shall take all reasonable steps to minimize or prevent any discharge in violation of this individual permit which has a reasonable likelihood of adversely affecting human health or the environment. 4. Civil and Criminal Liability Except as provided in Part III, Section C of this permit regarding bypassing of stormwater control facilities, nothing in this individual permit shall be construed to relieve the permittee from any responsibilities, liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3,143-215.6A, 143-215.613, 143- 215.6C or Section 309 of the Federal Act, 33 USC 1319. Furthermore, the permittee is responsible for consequential damages, such as fish kills, even though the responsibility for effective compliance may be temporarily suspended. 5. Oil and Hazardous Substance Liability Nothing in this individual permit shall be construed to preclude the institution of any legal action or relieve - the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to under NCGS 143-215.75 et seq. or Section 311 of the Federal Act, 33 USC 1321. 6. Property Rights The issuance of this individual permit does not convey any property rights in either real or personal property, or any exclusive privileges, nor does it authorize any injury to private property or any invasion of personal rights, nor any infringement of Federal, State or local laws or regulations. Severability The provisions of this individual permit are severable, and if any provision of this individual permit, or the application of any provision of this individual permit to any circumstances, is held invalid, the application of such provision to other circumstances, and the remainder of this individual permit, shall not be affected thereby. Dutv to Provide Information The permittee shall furnish to the Director, within a reasonable time, any information which the Director may request to determine whether cause exists for modifying, revoking and reissuing, or terminating the permit issued pursuant to this individual permit or to determine compliance with this individual permit. The permittee shall also furnish to the Director upon request, .copies of records required to be kept by this individual permit. Penalties for Tamnerin The Clean Water Act provides that any person who falsifies, tampers with, or knowingly renders inaccurate, any monitoring device or method required to be maintained under this individual permit shall, upon conviction, be punished by a fine of not more than $10,000 per violation, or by imprisonment for not more than two years per violation, or by both. If a conviction of a person is for a violation committed after a first conviction of such person under this paragraph, punishment is a fine of not more that $20,000 per day of violation, or by imprisonment of not more than 4 years, or both. Part III Page 2 of 8 Permit No. NCS000315 responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position.); and (3) The written authorization is submitted to the Director. C. Any person signing a document under paragraphs a. or b. of this section shall make the following certification: "I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations." 4. Individual Permit Modification, Revocation and Reissuance or Termination The issuance of this individual permit does not prohibit the Director from reopening and modifying the individual permit, revoking and reissuing the individual permit, or terminating the individual permit as allowed by the laws, rules, and regulations contained in Title 40, Code of Federal Regulations, Parts 122 and 123; Title 15A of the North Carolina Administrative Code, Subchapter 2II .0100; and North Carolina General Statute 143-215.1 et al. Permit Actions The permit may be modified, revoked and reissued, or terminated for cause. The notification of planned changes or anticipated noncompliance does not stay any individual permit condition. SECTION C: OPERATION AND MAINTENANCE OF POLLUTION CONTROLS Proper Operation and Maintenance The permittee shall at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances) which are installed or used by the.permittee to achieve compliance with the conditions of this individual permit. Proper operation and maintenance also includes adequate laboratory controls and appropriate quality assurance procedures. This provision requires the operation of back-up or auxiliary facilities or similar systems which are installed by a permittee only when the operation is necessary to achieve compliance with the conditions of this individual permit. 2. Need to Halt or Reduce Not a Defense It shall not be a defense for a permittee in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the condition of this individual permit. Bypassing of Stormwater Control Facilities Bypass is prohibited and the Director may take enforcement action against a permittee for bypass unless: a. Bypass was unavoidable to prevent loss of life, personal injury or severe property damage; and Part III Page 4 of 8 Permit No. NCS000315 To meet the intent of the monitoring required by this individual permit, all test procedures must produce minimum detection and reporting levels and all data generated must be reported down to the minimum - -detection or lower reporting level of the procedure. - - Representative Outfall If a facility has multiple discharge locations with substantially identical stormwater discharges that are required to be sampled, the permittee may petition the Director for representative outfall status. If it is established that the stormwater discharges are substantially identical and the permittee is granted representative outfall status, then sampling requirements may be performed at a reduced number of outfalls. 6. Records Retention Visual monitoring shall be documented and records maintained at the facility along with the Stormwater Pollution Prevention Plan. Copies of analytical monitoring results shall also be maintained on-site. The permittee shall retain records of all monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, and copies of all reports required by this individual permit for a period of at least 5 years from the date of the sample, measurement, report or application. This period may be extended by request of the Director at any time. Inspection and Entry The permittee shall allow the Diiector, of ail authori/-ed representative (including an authorized contractor acting as a representative of the Director), or in the case of a facility which discharges through a municipal separate storm sewer system, an authorized representative of a municipal operator or the separate storm sewer system receiving the discharge, upon the presentation of credentials and other documents as may be required by law, to; a. Enter upon the permittee's premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions of this individual permit; b. Have access to and copy, at reasonable times, any, records that must be kept under the conditions of this individual permit; C. Inspect at reasonable times any facilities, equipment (including monitoring and control equipment), practices, or operations regulated or required under this individual permit; and d. Sample or monitor at reasonable times, for the purposes of assuring individual permit compliance or as otherwise authorized by the Clean Water Act, any substances or parameters at any location. SECTION E: REPORTING REQUIREMENTS Discharge Monitoring Deports Samples analyzed in accordance with the terms of this permit shall be submitted to the Division on Discharge Monitoring Report (DMR) forms provided by the Director. Submittals shall be delivered to the Division no later than 30 days from the date the facility receives the sampling results from the laboratory. When no discharge has occurred from the facility during the report period, the permittee is required to submit a discharge monitoring report within 30 days of the end of the six-month sampling period, giving all required information and indicating "NO FLOW" as per NCAC T15A 02B .0506. Part III Page 6 of 8 Permit No. NCS000315 the time the permittee became aware of the circumstances. A written submission shall also be provided within 5 days of the time the permittee becomes aware of the circumstances. The written submission shall contain a description of the noncompliance, and its causes; the period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time compliance is expected to continue; and steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. The Director may waive the written report on a case-by-case basis if the oral report has been received within 24 hours. 9. Other Noncompliance The permittee shall report all instances of noncompliance not reported under 24 hour reporting at the time monitoring reports are submitted. 10. Other Information Where the permittee becomes aware that it failed to submit any relevant facts in an application for an individual permit or in any report to the Director, it shall promptly submit such facts or information. Part III Page 8 of 8 Permit No. NCS000315 6. Bulk Storage of Liquid Products Liquid raw materials, manufactured products, waste materials or by-products with a single above ground storage container having a capacity of greater than 660 gallons or with multiple above ground storage containers located in close proximity to each other having a total combined storage capacity of greater than 1,320 gallons. 7. Clean Water Act The Federal Water Pollution Control Act, also known as the Clean Water Act (CWA), as amended, 33 USC 1251, et. seq. 8. Division or DWO The Division of Water Quality, Department of Environment and Natural Resources. 9. Director The Director of the Division of Water Quality, the permit issuing authority. 10. EMC The North Carolina Environmental Management Commission. 11. Grab Sample An individual sample collected instantaneously. Grab samples that will be directly analyzed or qualitatively monitored must be taken within the first 30 minutes of discharge. 12. Hazardous Substance Any substance designated under 40 CFR Part 116 pursuant to Section 311 of the Clean Water Act. 13. Landfill A disposal facility or part of a disposal facility where waste is placed in or on land and which is not a land treatment facility, a surface impoundment, an injection well, a hazardous waste long-term storage facility or a surface storage facility. 14. Municipal Separate Storm Sewer System A stormwater collection system within an incorporated area of local self-government such as a city or town. 15. No Exposure A condition of no exposure means that all industrial materials and activities are protected by a storm resistant shelter or acceptable storage containers to prevent exposure to rain, snow, snowmelt, or runoff. Industrial materials or activities include, but are not limited to, material handling equipment or activities, industrial machinery, raw materials, intermediate products, by-products, final products, or waste products. DWQ may grant a No Exposure Exclusion from NPDES Stormwater Permitting requirements only if a facility complies with the terms and conditions described in 40 CFR § 122.26(g). 16. Overburden Any material of any nature, consolidated or unconsolidated, that overlies a mineral deposit, excluding topsoil or similar naturally -occurring surface materials that are not disturbed by mining operations. 17. Permittee The owner or operator issued a permit pursuant to this individual permit. 18. Point Source Discharge of Stormwater Any discernible, confined and discrete conveyance including, but not specifically limited to, any pipe, ditch, channel, tunnel, conduit, well, or discrete fissure from which stormwater is or may be discharged to waters of the state. Part VI Page 2 of 4 Pages Permit No. NCS000315 26. Significant Spills Includes, but is not limited to: releases of oil or hazardous substances in excess of reportable quantities under section 311 of the Clean Water Act (Ref: 40 CFR 110.10 and CFR 117.21) or section 102 of CERCLA (Ref: 40 CFR 302.4). 27. Stormwater Runoff The flow of water which results from precipitation and which occurs immediately following rainfall or as a result of snowmelt. 28. Stormwater Associated with Industrial Activi The discharge from any point source which is used for collecting and conveying stormwater and which is directly related to manufacturing, processing or raw material storage areas at an industrial site. Facilities considered to be engaged in "industrial activities" include those activities defined in 40 CFR 122.26(b)(14). The term does not include discharges from facilities or activities excluded from the NPDES program. 29. Stormwater Pollution Prevention Plan A comprehensive site-specific plan which details measures and practices to reduce stormwater pollution and is based on an"evaluation of the pollution potential of the site. 30. Ten Year Design Storm The maximum 24 hour precipitation event expected to be equaled or exceeded on the average once in ten years. Design storm information can be found in the State of North Carolina Erosion and Sediment Control Planning and Design Manual. 31. Total Flow The flow corresponding to the time period over which the entire storm event occurs. Total flow shall be either; (a) measured continuously, (b) calculated based on the amount of area draining to the outfall, the amount of built -upon (impervious) area, and the total amount of rainfall, or (c) estimated by the measurement of flow at 20 minute intervals during the rainfall event. 32. Total Maximum Daily Load (TMDL) A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. A TMDL is a detailed water quality assessment that provides the scientific foundation for an implementation plan. The implementation plan outlines the steps necessary to reduce pollutant loads in a certain body of water to restore and maintain water quality standards in all seasons. The Clean Water Act, Section 303, establishes the water quality standards and TMDL programs. 33. Toxic Pollutant Any pollutant listed as toxic under Section 307(a)(1) of the Clean Water Act. 34. Vehicle Maintenance Activity Vehicle rehabilitation, mechanical repairs, painting, fueling, lubrication, vehicle cleaning operations, or airport deicing operations. 35. Visible Sedimentation Solid particulate matter, both mineral and organic, that has been or is being transported by water, air, gravity, or ice from its site of origin which can be seen with the unaided eye. - 36. 25 -year, 24 hour storm event The maximum 24-hour precipitation event expected to be equaled or exceeded, on the average, once in 25 years. Part VI Page 4 of 4 Pages