ML21076A476

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Cimarron Environmental Response Trust Facility Decommissioning Plan, Revision 2, Appendix B, SWP3 and General Permit, Part 1
ML21076A476
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Site: 07000925
Issue date: 02/26/2021
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Environmental Properties Management, Enercon Services, Burns & McDonnell Engineering Co, Veolia Nuclear Solutions Federal Services
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Office of Nuclear Material Safety and Safeguards, Cimarron Environmental Response Trust, NRC Region 4
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BURNS ~ M£DONNELL.

Stormwater Pollution Prevention Plan Cimarron Environmental Response Trust Groundwater Remediation Project Project No. 96785 November 2017

Stormwater Pollution Prevention Plan prepared for Cimarron Environmental Response Trust Groundwater Remediation Project Logan County, Oklahoma Project No. 96785 November 2017 prepared by Burns & McDonnell Engineering Company, Inc.

Dallas, Texas COPYRIGHT© 2017 BURNS & McDONNELL ENGINEERING COMPANY, INC.

OWNER'S CERTIFICATION CERT Groundwater Remediation Project "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 gathered and evaluated 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 submittingfalse information, including the possibility of fine and imprisonment for knowing violations. "

Bill Halliburton Administrator Authorized Official Title 11/9/2017 Signature Date Not individually but solely in his representative capacity as Administrator of the Cimarron Environmental Response Trust

CONTRACTOR CERTIFICATION Burns & MC Donne 11 ~~~:;~nM~~v:i~;t;,~~i"~~;;~;,;us' Site inLogan County,Oklahoma ttlaf!Of& 'iiiiirau ll &t'IJFI 981. OaSl(Qf(QQ JOUi S: I 136 7 am ofOperator) (Project ame)

Contractor , builders regular suppliers or others contractors) involved in construction activity who are not the operator develop r, or general contractor and have not been issued the tormwater Construction General Permit (Permit) authorization to discharge, execute thi Contractor Certification which places the respon ibility of complying with and abiding by the intent and purpo e of the permit with the contractor for any and all work performed under the authority and direction of the contractor. Furthermore, the contractor assumes responsibility to avoid or eliminate any actual or potential adver e effects upon the environm nt according to the Stormwater Pollution Prevention Plan (SWP3), during all phase of building construction, or delivery activity on any and all construction sites under the control and responsibility of the contractor as de cribed in the WP3.

l . Contractor company name: ~UX.

2. Contractoraddres: ~o &ox. S'o, ~~-~

(For additional addr~. atta b list to this fonn)

4. Contractor mu t be thoroughly familiar with the original otice of Intent 01) filed by _ _ __ _

" t'\C)1.i-.,.....,.._,l:i'l'1., with the Oklahoma Department of Environmental Quality.

Contractor must al o be thoroughly familiar with~and adhere to the WP3 and the Be t Management Practices (BMP ) on file at the foJlowing location- ~ , "'?<o*

  • The Contractor is certifying below that they assume all phy ical responsibility for any and all construction activitie performed by the Contractor or under the direction and control of the Contractor, to avoid or eliminate any actual or p tential adverse effects upon the environment pertaining to the propertie listed in Item 3 abo .

Certificatio I certify that I understand the terms and conditions of the Oklahoma Pollutant Discharge Elimination y tern Act (OPDES) General Permit that authorizes stormwater discharges associated with construction activity from the construction ite identified as part of thi certification. I have read and understand th Operator' 01 and Part 1.2 for co erag under the Genera) Permit for rmwater discharges from construction activiti including those requirements published in the modified OPD General Permit1 OKR.10 of ptember 13, 2017, and the WP3 and BMP described pertaining to the project locations in Item 3 above. I agree that as a contractor, builder, regular upplier or a upport service company, I am responsible for installing and/or maintaining the appropriate pollution prevention measures that I am respon ible for according to the agreement I have with the pennittee.

I understand that continued co erage under thi permit i contingent upon maintaining Part 1.2 of the pennit.

ignature: l,?

Title:

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Print

//www.deq.state.ok.us/wqdnew/stormwat constructionllOl 7 inaJ%20CGP%202017 .pdf

Stormwater Pollution Prevention Plan Table of Contents TABLE OF CONTENTS Page No.

1.0 INTRODUCTION

............................................................................................... 1-1

1. 1 Project Owner and Operator ................................................................................ 1-2 1.2 Stormwater Team ................................................................................................. 1-2 1.3 Standard Permit Conditions ................................................................................. 1-3 1.3.1 Duty to Comply with Permit Conditions .............................................. 1-3 1.3.2 Notice of Intent ..................................................................................... 1-3 1.3 .3 Site Notice Posting Requirements ........................................................ 1-4 1.3.4 SWP3 Modification .............................................................................. 1-4 1.3.5 Notice of Termination ........................................................................... 1-4 1.3.6 Retention of Records ............................................................................. 1-5 1.4 SWP3 Certification .............................................................................................. 1-5 2.0 CONSTRUCTION ACTIVITIES AND SITE DESCRIPTION .............................. 2-1 2.1 Nature of Construction Activity ........................................................................... 2-1 2.2 Planned Sequence of Major Construction Activities ........................................... 2-1 2.3 Site Maps ............................................................................................................. 2-2 2.4 Soils ...................................................................................................................... 2-2 2.5 Estimate of Runoff Coefficient ............................................................................ 2-3 2.6 Potential Pollutants .............................................................................................. 2-4 2.7 Threatened and Endangered Species ................................................................... 2-5 2.8 Cultural Resources ............................................................................................... 2-6 2.9 Water Quality and Impaired Waters .................................................................... 2-6 2.10 Floodplain Development Impacts ........................................................................ 2-7 3.0 CONTROLS - STRUCTURAL PRACTICES ..................................................... 3-1 3.1 Temporary Erosion and Sediment Control Practices ........................................... 3-1 3.1.1 Street Sweeping .................................................................................... 3-1 3.1.2 SiltFence .............................................................................................. 3-1 3.1.3 Dewatering ............................................................................................ 3-2 3.1.4 Soil Stockpiles ...................................................................................... 3-2 3.1.5 Material Storage and Equipment Staging Area .................................... 3-2 3.2 Permanent Stormwater Control Practices ............................................................ 3-2 4.0 CONTROLS - STABILIZATION PRACTICES .................................................. 4-1 4.1 Stabilization ......................................................................................................... 4-1 4.2 Temporary Stabilization....................................................................................... 4-1 4.3 Final Stabilization ................................................................................................ 4-1 4.4 Permanent Vegetative Cover ............................................................................... 4-2 5.0 OTHER CONTROLS ......................................................................................... 5-1 5.1 Natural Vegetated Buffer ..................................................................................... 5-1 CERT TOC-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Table of Contents 5.2 Dust Control ......................................................................................................... 5-1 5.3 Waste Materials ................................................................................................... 5-1 5.4 Sanitary Waste ..................................................................................................... 5-1 5.5 Hazardous Waste ................................................................................................. 5-2 6.0 MAINTENANCE AND INSPECTION ................................................................ 6-1 6.1 Inspection Procedures .......................................................................................... 6-1 6.1.1 Areas Requiring Inspection ................................................................... 6-1 6.1.2 Inspection Requirements ....................................................................... 6-1 6.1.3 Inspection Report .................................................................................. 6-2 6.2 SWP3 Staff Training ............................................................................................ 6-3 6.3 Corrective Action ................................................................................................. 6-3 6.4 Distribution List ................................................................................................... 6-4 7 .0 SPILL PREVENTION AND CONTROL. ............................................................ 7-1 7.1 Materials Management Practices ......................................................................... 7-1 7.1.1 Non-Petroleum Products ....................................................................... 7-2 7.1.2 Petroleum Products ............................................................................... 7-2 7.2 Spill Response ...................................................................................................... 7-2 APPENDIX A- GENERAL PERMIT APPENDIX B- NOTICE OF INTENT AND AUTHORIZATION APPENDIX C- CONSTRUCTION SITE NOTICE APPENDIX D- NOTICE OF TERMINATION APPENDIX E- FIGURES AND RUNOFF COEFFICIENT CALCULATION APPENDIX F- AGENCY CORRESPONDENCE APPENDIX G- EROSION AND SEDIMENT CONTROL PLAN APPENDIX H- BEST MANAGEMENT PRACTICE DETAILS APPENDIX I- INSPECTION AND MAINTENANCE REPORT FORMS APPENDIX J - SPILL REPORT FORM CERT TOC-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Table of Contents LIST OF TABLES Page No.

Table 1-1: Stormwater Team ................................................................................................... 1-3 Table 2-1: Soils within the Project Site in Logan County, Oklahoma .................................... 2-2 Table 2-2: Potential Project-Related Pollutants ....................................................................... 2-4 Table 2-3: Federally Listed Species in Logan County, Oklahoma .......................................... 2-5 Table 6-1: Stormwater Inspector Identification List ................................................................ 6-1 Table 6-2: Distribution List ..................................................................................................... 6-4 CERT TOC-3 Burns & McDonnell

Stormwater Pollution Prevention Plan List of Abbreviations LIST OF ABBREVIATIONS Abbreviation Term/Phrase/Name ARC Aquatic Resources of Concern BMPs best management practices Bums & McDonnell Bums & McDonnell Engineering Company, Inc.

CFR Code of Federal Regulations CERT Cimarron Environmental Response Trust ECB erosion control blanket EPA U.S. Environmental Protection Agency ESC Plan Erosion and Sediment Control Plan NOI Notice of Intent NOT Notice of Termination NPDES National Pollutant Discharge Elimination System Oklahoma DEQ Oklahoma Department of Environmental Quality Permit Oklahoma DEQ General Permit OKR 10 Project Groundwater Remediation Project sos Safety Data Sheet SPCC Plan Spill Prevention, Control, and Countermeasure Plan SWP3 Stormwater Pollution Prevention Plan USFWS U.S. Fish and Wildlife Service CERT Burns & McDonnell

Stormwater Pollution Prevention Plan Introduction

1.0 INTRODUCTION

The U.S. Environmental Protection Agency (EPA) requires a National Pollutant Discharge Elimination System (NPDES) Permit for stormwater discharges from construction activities that disturb I or more acres of land or from smaller sites that are part of a larger, common plan of development or sale which will disturb a cumulative total of 1 or more acres. For the purpose of the NPDES program, construction activities are defined as clearing, grading, excavation, and other construction-related activities (e.g.,

stockpiling of fill material, placement of raw materials at the site).

In the State of Oklahoma, the NPDES program has been delegated to the Water Quality Division of the Oklahoma Department of Environmental Quality (Oklahoma DEQ). Construction projects that will disturb greater than I acre of land are issued a certificate of permit coverage under Oklahoma DEQ General Permit OK.RIO (Permit), which authorizes the discharge of stormwater associated with construction activities into State waters. Coverage under the Permit is obtained by developing a Stormwater Pollution Prevention Plan (SWP3) and submitting a Notice of Intent (NOi) to the Oklahoma DEQ. The SWP3 must be developed prior to NOi submittal.

Stormwater discharges from construction activities associated with the Groundwater Remediation Project (Project) for Cimarron Environmental Response Trust (CERT) are authorized under the Permit; copies of the Permit and NOi are provided in Appendix A and Appendix B, respectively. The Permit authorization will be included in Appendix B once received.

The SWP3 described herein establishes a plan to manage the quality of stormwater runoff from construction activities associated with the Project and was developed in accordance with the requirements and guidelines specified in the Permit. The SWP3 was also written with the assistance of and information from the EPA's 2007 Developing Your Stormwater Pollution Prevention Plan: A Guide for Construction Sites.

This SWP3 must be used by onsite construction personnel to reduce soil erosion and to minimize the potential for sediment and other on site pollutants to leave the Project site and enter waters of the State of Oklahoma. The SWP3 identifies a set of best management practices (BMPs) to be implemented on the Project site; however, BMPs may need to be moved, added, or redesigned to control erosion and sedimentation to the extent practicable. The SWP3 must be updated and revised when stormwater control measures are modified due to a change in design, construction method, operation, maintenance procedure, etc.

CERT 1-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Introduction 1.1 Project Owner and Operator The contact information for CERT, the Project owner, is provided below:

Cimarron Environmental Response Trust 9400 Ward Parkway Kansas City, MO 64114 Phone: (816)333-9400 Bums & McDonnell Engineering Company, Inc. (Bums & McDonnell), the operator, will have day-to-day operational control over the site and will be responsible for completing the Project. Onsite responsibilities include implementing the SWP3, directing the installation and maintenance of BMPs, inspecting the Project site, implementing and supervising housekeeping, documenting changes to the SWP3, keeping records of inspections and other activities, providing staff training, communicating changes in the SWP3 to onsite personnel, and peri~dic evaluation of the SWP3 provisions onsite. Below is the contact information for Bums & McDonnell:

Bums & McDonnell Engineering Company, Inc.

9400 Ward Parkway Kansas City, MO 64114 Phone: (816)333-9400 The operator's point of contact for the Project is Mr. John Hesemann, Project Manager, who can be contacted via email at jhesemann@bumsmcd.com or by telephone at (314) 682-1560.

The Project's point of contact for the Project is Mr. Jeff Lux, Project Manager with Environmental Properties Management, LLC, who can be contacted via email atjlux@envpm.com or by telephone at (405) 642-5152. Below is the contact information for Environmental Properties Management, LLC:

Environmental Properties Management, LLC 615 North Hudson, Suite 200 Oklahoma City, OK 73102 Phone: (405) 642-5152 1.2 Stormwater Team The parties responsible for implementing each pollution control measure in the SWP3, along with who is responsible during construction, who will be responsible once the Project is complete, and contact information is provided in Table 1-1. This table will be updated as additional personnel are identified, and a copy will be kept onsite.

CERT 1-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Introduction Table 1-1: Stormwater Team Name/Title Project Role Company Phone Number Bill Halliburton, Trustee Trustee Cimarron Environmental (816) 822-3545 Response Trust John Hesemann, Regional Project Manager Bums & McDonnell (314) 682-1560 Manager Engineering Company, Inc.

Jeff Lux, Project Manager Facility Contact Environmental Properties (405) 642-5152 Management, LLC Doug Cox, Site Contractor Site Remediation Services, Inc. (918) 688-9617 Superintendent Foreman Ken Gouvion, Staff SWP3 Author Bums & McDonnell (816) 605-7821 Environmental Scientist Engineering Company, Inc.

Johnny Gillman, Site Safety SWP3 Maintenance Remediation Services, Inc. (620) 252-9918 Johnny Gillman, Site Safety SWP3 Trainer Remediation Services, Inc. (620) 252-9918 Jody Weikart, Staff Geologist S WP3 Inspector Bums & McDonnell (513) 490-5331 Engineering Company, Inc.

Doug Cox, Site BMP Installation Remediation Services, Inc. (918) 688-9617 Superintendent and Maintenance Foreman 1.3 Standard Permit Conditions This section discusses State and Federal penalties for noncompliance with the Permit, as well as standard Permit conditions. The staff responsible for implementation of the SWP3 must be familiar with the requirements of the SWP3 and the Permit.

1.3.1 Duty to Comply with Permit Conditions The Oklahoma DEQ and EPA have substantial penalties for noncompliance with the Permit. Bums &

McDonnell has a duty to comply with Permit conditions. Failure to comply with Permit conditions is a violation of the Permit and statutes under which it was issued and is grounds for enforcement action including terminating Permit coverage, modification of Permit coverage, or denial of the Permit renewal application, as well as potential criminal, civil, and administrative penalties.

1.3.2 Notice of Intent The Oklahoma DEQ requires all projects that disturb more than 1 acre to submit a NOi and develop a SWP3. A copy of this SWP3 will be kept for public inspection in the site manager's truck.

CERT 1-3 Burns & McDonnell

Stormwater Pollution Prevention Plan Introduction If a modification to the NOi is necessary, due to changes to the Project (e.g., the extent of disturbance has increased), an amended NOi must be submitted to the Oklahoma DEQ. However, an amended NOi should not be submitted if the extant of the disturbance has decreased. The amendment must include the Project's assigned Permit number and the requested change. The SWP3 must be updated to reflect the modifications.

1.3.3 Site Notice Posting Requirements A copy of the NOi and a Construction Site Notice (Appendix C) must be posted at the entrance to the Project site so it is visible from a public road. At a minimum, the Construction Site Notice must include the Project description, the NPDES Permit tracking number, and a contact name and phone number for obtaining additional Project information.

1.3.4 SWP3 Modification The SWP3 must be modified, including site map(s), within 7 calendar days for any of the following conditions:

  • A new operator becomes active on Project site
  • Construction plans, erosion or sediment control BMPs, or other construction activities have changed and are no longer accurately reflected in the SWP3
  • Operational control of a portion of the Project site has change
  • Site inspections or investigations by Oklahoma DEQ have determined that modifications are necessary
  • Oklahoma DEQ determines it necessary to installed and/or implement additional controls to meet the requirements of the Permit (e.g., an approved Total Maximum Daily Load report applies to the site)
  • A revision to local, State, or Federal regulations affect the erosion and sediment control BMPs implemented onsite SWP3 modifications shall also include the date and the name of the person authorizing the modification.

If there are multiple operators (or subcontractors) impacted by the modifications, the permittee must immediately notify them of the modifications.

1.3.5 Notice of Termination Permit coverage is terminated by submitting a Notice of Termination (NOT) to the Oklahoma DEQ within 30 days of final stabilization and completion of the Project. Authorization to discharge will be CERT 1-4 Burns & McDonnell

Stormwater Pollution Prevention Plan Introduction terminated when DEQ issues a termination letter to the permittee indicating that all termination requirements have been met and their completed NOT has been processed. A copy of the NOT form is included in Appendix D.

1.3.6 Retention of Records A copy of the SWP3 must be maintained onsite (e.g., construction office, site manager's truck) from the date of Project initiation to the date of Project completion. Records must be maintained for dates when clearing occurs, construction activities temporarily or permanently cease, stabilization measures are initiated, and final stabilization is achieved. Bums & McDonnell must retain copies of the SWP3, reports required by the Permit, and records of data used to complete the NOi for a period of at least 3 years from the date that the Project site is finally stabilized and the NOT submittal date. The time period may be extended at the request of the Director of the Oklahoma DEQ at any time.

1.4 SWP3 Certification CERT must certify the SWP3 by signing the Owner's Certification form (located at the front of this document). This form must also be attached to any Project-related document identified by Part 6.7 of the Permit. By signing the Contractor Certification form (also located near the front of this document, copy as needed), contractors and subcontractors signify that they have read, understand, and will adhere to the SWP3 before conducting construction work that involves soil disturbance. The signed certification confirms that CERT has notified the contractor or subcontractor that a SWP3 has been prepared for the Project and that it will perform the necessary actions identified to comply with the SWP3 and the Permit.

CERT 1-5 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description 2.0 CONSTRUCTION ACTIVITIES AND SITE DESCRIPTION The following sections include a description of the construction activities that will take place for the Project as well as information regarding the natural resources in and adjacent to the Project site.

2.1 Nature of Construction Activity The Project will construct four injection trenches and one extraction trench in Logan County, Oklahoma (35°53'00.84"N, 97°34'34.03"W) to test the groundwater injection and extraction efficiency as part of final design for a groundwater remediation project. The goal of the groundwater remediation project is to reduce the concentration of contaminates (e.g., uranium, nitrates, and fluorides) in the groundwater to levels that will allow unrestricted release of the site and license termination from the U.S. Nuclear Regulatory Commission and the Oklahoma DEQ. Major soil-disturbing activities associated with the Project include trenching, excavation, backfilling, and vehicular traffic. The Project site is approximately 665 acres, of which an estimated 1 acre will be disturbed. Construction is scheduled to begin on September 18, 2017, with an estimated completion date of January 15, 2018. This SWP3 has been developed to address all construction activities associated with the Project.

2.2 Planned Sequence of Major Construction Activities The following is a chronological list of the planned sequence of activities and implementation of temporary BMPs for Project construction:

1. Install erosion and sediment control BMPs, including silt fence, prior to any earth-disturbing activities (September 2017).
2. Strip and stockpile topsoil (September 2017).
3. Excavate the test trenches to the specified depth and dimensions (September to November 2017).
4. Clean and scour the sidewalls of the trenches (October to November 2017).
5. Install groundwater injection/extraction well piping and risers (October to November 2017).
6. Backfill trenches with aggregate to prescribed depth and cover with geotextile (October to November 2017).
7. Backfill trench to existing grade with trenching spoils (October to November 2017).
8. Re-establish topsoil and vegetative soil cover (November to December 2017).
9. Upon achievement of final stabilization, remove temporary erosion and sediment control BMPs.
10. Submit the NOT to Oklahoma DEQ.

CERT 2-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description 2.3 Site Maps The General Vicinity Map, Detailed Water Resources Map, and Soils Map are provided in Appendix E.

2.4 Soils According to the U.S. Department of Agriculture, Natural Resources Conservation Service, Web Soil Survey of Logan County, Oklahoma, 23 soil types are found on the Project site. These soil types are detailed in Table 2-1 and depicted on the Soils Map. The erosion factor K, with possible values ranging from 0.02 to 0.69, signifies how susceptible a soil is to sheet and rill erosion by water. The larger the K value, the more susceptible the soil is to erosion. The upper horizons of the soil within the Project site have a low to moderately high susceptibility to erosion by water, with erosion K factors between 0.05 and 0.49.

Table 2-1: Soils within the Project Site in Logan County, Oklahoma Map Erosion Hydro logic Soil Type Symbol Soil Description K Factor Soil Group3 Coyle-Ashport-Ironmound CAID Shallow to very deep and well 0.43 C complex, 1 to 8 percent drained with moderate to high slopes permeability Coyle-Ironmound complex, CoIC2 Shallow to moderately deep and 0.32 C 3 to 5 percent slopes, well drained with moderately high eroded to high permeability Darsil-Rock outcrop DiRG Shallow and excessively drained 0.28 D complex, 15 to 45 percent with rock outcrops slopes Easpur loam, 0 to 1 percent EasA Very deep and well drained with 0.28 B slopes, occasionally moderate permeability flooded Gaddy loamy fine sand, 0 GadA Very deep and somewhat 0.17 A to 1 percent slopes, excessively drained with occasionally flooded moderately rapid to very rapid permeability Gaddy-Grace more GaGA Very deep and somewhat poorly 0.20 A complex, 0 to 1 percent to excessively drained with slopes, frequently flooded moderately rapid to very rapid permeability Goodnight loamy fine GohE Very deep and excessively 0.17 A sand, 5 to 15 percent slopes drained with rapid permeability Goodnight fine sand, 1 to GooE Very deep and excessively 0.05 A 15 percent slopes drained with rapid permeability Grainola silty clay loam, 3 GraC Moderately deep and well drained 0.43 D to 5 percent slopes with slow permeability CERT 2-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description Map Erosion Hydrologic Soil Type Symbol Soil Description K Factor Soil Groupa Ironmound-eoyle complex, IreE Shallow to moderately deep and 0.37 D 5 to 15 percent slopes well drained with moderately high to high permeability Ironmound loam, 3 to 5 Iroe2 Shallow and well drained with 0.32 D percent slopes, eroded high permeability Lebron clay, 0 to I percent LerA Very deep and very poorly 0.24 D slopes, occasionally drained with very slow flooded permeability Mulhall loam, 3 to 5 Mule Very deep and well drained 0.24 B percent slopes Pits PIT NA NA D Renfrow silt loam, 3 to 5 Rene Very deep and well drained with 0.49 D percent slopes very slow permeability Renthin silt loam, I to 3 RinB Deep and well drained with very 0.43 D percent slopes slow permeability Renthin silty clay loam, 3 Rnne2 Deep and well drained with very 0.37 D to 5 percent slopes, eroded slow permeability Urban land URB NA NA D Yahola loam, 0 to I percent YaaA Very deep and well drained with 0.32 A slopes, occasionally moderately rapid permeability flooded Yahola fine sandy loam, 0 YahA Very deep and well drained with 0.20 A to I percent slopes, moderately rapid permeability occasionally flooded Zaneis loam, I to 3 percent ZanB Deep and well drained with 0.37 B slopes moderate permeability Zaneis loam, 3 to 5 percent Zane Deep and well drained with 0.37 B slopes moderate permeability Zaneis loam, 3 to 5 percent Zane2 Deep and well drained with 0.37 B slopes, eroded moderate permeability Source: U.S. Department of Agriculture, Natural Resources Conservation Service Web Soil Survey. Accessed January 17, 2017, at http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx.

(a) Hydrologic soil group indicates the infiltration rate of the soil: Group A at> 0.30 inch/hour, Group Bat 0.15-0.30 inch/hour, Group C at 0.05-0.15 inch/hour, and Group D at 0.00-0.05 inch/hour.

2.5 Estimate of Runoff Coefficient The runoff coefficient "e" is the ratio of the volume of stormwater runoff from a site compared to the total volume of precipitation that falls on the site. Major variables affecting "e" are rainfall intensity and duration. For a given terrain, the ratio of runoff to rainfall is expected to increase as storm intensity or duration increase. An estimate of "e" is needed for runoff conditions on the Project site before construction activities commence and after the area is stabilized. Based on site evaluations and available CERT 2-3 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description soils data, the pre-construction "C" value for the Project site is 0.22. Because no additional impervious surfaces are being added to the site, the post-construction "C" value is anticipated to be 0.22. The "C" value was determined using the 1992 Rational Method from Design and Construction of Urban Storm Water Management Systems, published by the American Society of Civil Engineers (Appendix E).

2.6 Potential Pollutants The primary pollutant sources on the Project site will be disturbed soils and subsequent stormwater runoff caused by grading and site excavation operations, vehicle tracking, and soil stockpiling. BMPs must be used on the Project site to control erosion and minimize sedimentation of disturbed soils. Other potential pollutants that may be present onsite are included in Table 2-2.

Table 2-2: Potential Project-Related Pollutants Material/Chemical Physical Description Stormwater Pollutants Location Clear green/yellow Ethylene glycol, propylene Leaks or broken Antifreeze/coolant liquid glycol, heavy metals hoses from (copper, lead, zinc) equipment Clear, blue-green to Petroleum distillate, oil & Staging area Diesel fuel yellow liquid grease, naphthalene, and xylenes Liquid or solid grains Nitrogen and phosphorous Newly seeded Fertilizer areas Colorless, pale brown, Benzene, ethyl benzene, Staging area Gasoline or pink petroleum toluene, xylene, and methyl hydrocarbon tertiary butyl ether Brown oily petroleum Mineral oil Leaks or broken Hydraulic oil/fluids hydrocarbon hoses from equipment Various colored liquid Bacteria, parasites, and Portable, on Sanitary toilets viruses Project site Non-storm water discharges from active construction sites are authorized if the discharge complies with Part 1.2.1.C of the Permit. During Project construction, the following discharges may occur:

  • Water used to wash vehicles where detergents are not used
  • Water used to control dust in accordance with Part 3.3.1.F of OKRI0
  • Uncontaminated ground water or spring water
  • Flows from emergency firefighting activities, if measures are taken by permittee or site/facility, as soon as practicable, to reduce any such pollutant releases, minimizing impacts on water quality and ensuring public health and safety CERT 2-4 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description

  • Uncontaminated flows from excavation dewatering activities, if operational and structural controls are used to reduce pollutant releases in order to avoid or minimize the impacts on water quality in accordance with Part 3 .3. l.M of OKR 1O; these structural controls must be included in the SWP3 .
  • Uncontaminated air conditioning or compressor condensate
  • Landscape irrigation
  • Potable water, including uncontaminated waterline flushing The following discharges will not be associated with the Project.
  • Fire hydrant flushings
  • Foundation or footing drains where flows are not contaminated with process materials such as solvents.
  • Routine external building wash down that does not use detergents and/or the external surfaces do not contain leachable hazardous substances (e.g., paint or caulk containing polychlorinated biphenyls ).
  • Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred

( unless all spilled material has been removed) and where detergents are not used.

2. 7 Threatened and Endangered Species According to the Oklahoma Department of Wildlife Conservation, no State-listed threatened or endangered species are known to occur in Logan County, Oklahoma. According to the U.S. Fish and Wildlife Service (USFWS) Information for Planning and Conservation, two federally listed endangered species and three threatened species are listed as potentially occurring in Logan County, Oklahoma. These species and their respective status are listed in Table 2-3.

Table 2-3: Federally Listed Species in Logan County, Oklahoma Common Name Scientific Name Federal Status Arkansas River shiner Notropis girardi Threatened Least tern Sterna antillarum Endangered Piping plover Charadrius melodus Threatened Red knot Calidris canutus rufa Threatened Whooping crane Grus americana Endangered Source: U.S. Fish and Wildlife Service, Information for Planning and Conservation.

Accessed January 18, 2017, at https://ecos.fws.gov/ipac/.

CERT 2-5 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description Critical habitat for the Arkansas River shiner is located adjacent to the Project site. However, it has been determined that Project activities are "not likely to adversely affect" the listed species or critical habitat.

The USFWS concurrence letter is provided in Appendix F.

2.8 Cultural Resources According to the National Register of Historic Places and the Oklahoma State Historic Preservation Office, no historic properties are located on or near the Project site. Additionally, no architectural properties are listed on or nominated for inclusion in the National Register of Historic Places. While cultural resources are not anticipated in the area of disturbance, workers must stop work immediately and notify Burns & McDonnell and the construction office upon discovery of items with potential historical significance, including but not limited to: arrowheads, bones, old bottles or building materials, building foundations, and suspected gravesites. If human remains are unearthed during excavation work, then the area must be secured, and the local law enforcement agency must be contacted immediately.

2.9 Water Quality and Impaired Waters According to the U.S. Geological Survey topographic map of the Project site, the first receiving waters are the Cimarron River (OK620910010010_10) and its unnamed tributaries, as depicted on the Detailed Water Resources Map provided in Appendix E. This segment of the Cimarron River is not listed as impaired on the 2014 Oklahoma Section 303(d) List of Impaired Waters. The Project will maintain a natural vegetated buffer (refer to Section 4.1) along all streams and will use BMPs (Chapter 3.0 and Chapter 4.0) as depicted on the Erosion and Sediment Control Plan (ESC Plan) in Appendix G to retain sediment onsite during construction. Project activities are not anticipated to adversely impact the receiving waters.

The Oklahoma DEQ has identified certain waterbodies and watersheds as Outstanding Resource Waters or Aquatic Resources of Concern (ARC) based on water quality or species habitat. In order to minimize sediment impacts, additional controls are required on projects that discharge to these sensitive waterbodies. No Outstanding Resource Waters are located on or adjacent to the Project site; however the Cimarron River has been designated as an ARC. According to Addendum A of the Permit, a 2-mile corridor (1 mile from each bank) must be established along the Cimarron River and is depicted on the General Vicinity Map, Detailed Water Resources Map, and ESC Plan. The additional requirements outlined in Part 3.3.2.A.2, Part 3.5.2, and Part 10.2 of the Permit (refer to Chapter 5.0 and Chapter 6.0) will be adhered to in the ARC corridor due to this designation.

CERT 2-6 Burns & McDonnell

Stormwater Pollution Prevention Plan Construction Activities and Site Description 2.10 Floodplain Development Impacts The Project is partially located within the 100-year floodplain in Logan County according to the Federal Emergency Management Agency. The Project will use appropriate construction means and methods within the 100-year floodplain. No structures will be constructed with the floodplain, and the Project site will be restored to the original contours. A floodplain permit application has been submitted to Logan County and is provided in Appendix F. The approved permit authorization is included in Appendix F, once received.

CERT 2-7 Burns & McDonnell

Stormwater Pollution Prevention Plan Controls - Structural Practices 3.0 CONTROLS - STRUCTURAL PRACTICES The following sections detail the structural erosion and sediment control BMPs and practices that must be implemented prior to the start of major earth-disturbing activities on the Project site.

3.1 Temporary Erosion and Sediment Control Practices Erosion and sediment control BMPs must be in place prior to soil-disturbing activities and must be maintained throughout construction. To limit the potential of sediment leaving the Project site, erosion and sediment control BMPs may be required in other locations of the Project site as work progresses.

These BMPs must be evaluated by the contractor/owner's representative in the field; if measures are changed, then the SWP3 must be modified in accordance with Chapter 6.0 of this document. The minimum temporary erosion and sediment control BMPs that will be used for the Project are discussed in the following subsections.

3.1.1 Street Sweeping Construction equipment and vehicles will use an existing aggregate access road to gain access to the site.

Soil and sediment tracked off the Project site and onto the surface of a public roadway, paved area, or sidewalk must be removed by sweeping and/or shoveling the roadway, paved area, or sidewalk surfaces, or by using other similarly effective means of sediment removal. Tracked-out soil and sediment must not be hosed or swept into any stormwater conveyance ( unless it is connected to a sediment basin, sediment trap, or similarly effective control), storm drain inlet, or surface water. Tracked-out soil and sediment must be removed by the end of the same work day in which the track-out occurs or by the end of the next work day if track-out occurs on a non-work day.

3.1.2 Silt Fence Silt fence will be used to intercept and retain sediment carried by sheet flow from disturbed areas and to limit sediment-laden runoff from leaving the Project site during construction. Silt fence should be placed perpendicular to the direction of water flow and as close to the topographic contours as possible, with the ends extending upslope. Silt fence should also be placed downslope of disturbed areas where sheet or rill erosion would occur and around soil stockpiles. Silt fence must be inspected and maintained on a regular basis, and sediment buildup must be removed when sediment reaches 50 percent of the height of the barrier. Silt fence may be installed with an additional wire backing to provide extra strength in locations that may receive higher stormwater runoff volumes. Locations requiring silt fence are indicated on the ESC Plan in Appendix G, and installation details for silt fence can be found in Appendix H.

CERT 3-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Controls - Structural Practices 3.1.3 Dewatering If dewatering becomes necessary, then the contractor will submit to Bums & McDonnel a dewatering plan, including appropriate BMPs, prior to any dewatering activities. Dewatering must be completed in such a way as to limit turbidity, including the use of filter bags or other appropriate measures. Dewatering waters will not be discharged to any wetlands, within natural vegetative buffers, or in a way that could cause erosion or scouring. Intakes shall draw from the top of the water column to the extent practicable to limit sediment and suspended solids from being pumped. Dewatering will not be allowed without Bums

& McDonnell's approval. The ESC Plan (Appendix G) indicates the location specified for dewatering activity discharges, and filter bag details are provided in Appendix H.

3.1.4 Soil Stockpiles Soil stockpiles must be located outside of any natural buffers and the I 00-year floodplain, and they must be protected with silt fence. All inactive soil stockpiles, that will not be used for 14 or more days, shall be covered or temporarily stabilized to avoid direct contact with precipitation, limit sediment discharge, and control the generation of dust (OKR IO Parts 3 .3. l.E and 3 .3 .2). Topsoil will be stockpiled separate from subsoil to preserve the seed bank and aid in restoration. Any excess subsoil, displaced by the aggregate fill, will be tested for contamination. Subsoil that is found to be contaminated will be disposed of in a manner consistent with State and Federal regulations. Subsoil that is not contaminated will be spread in a thin layer, outside of any natural buffers and the I 00-year floodplain, and stabilized onsite. Soil stockpile locations are indicated on the ESC Plan in Appendix G.

3.1.5 Material Storage and Equipment Staging Area There will be no dedicated onsite material storage areas or equipment and construction staging areas on this Project. Construction equipment will be staged overnight at the trench location, within the silt fence perimeter. For the trenches that are located within the 100-year floodplain, the equipment will be staged overnight at the soil stockpile location, within the silt fence perimeter.

3.2 Permanent Stormwater Control Practices Permanent stormwater control BMPs are those that will be left in place after construction is finished and the site is stabilized to manage stormwater flow and quality. These BMPs must be in place prior to completion of the Project and before submitting the NOT. No permanent stormwater control BMPs are anticipated for this Project. If it is determined by the contractor/owner's representative in the field that permanent stormwater control BMPs need to be installed, then the SWP3 must be modified in accordance with Chapter 6.0 of this document.

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Stormwater Pollution Prevention Plan Controls - Stabilization Practices 4.0 CONTROLS - STABILIZATION PRACTICES The following sections detail the stabilization practices to be implemented during and after Project construction activities.

4.1 Stabilization Stabilization measures must be initiated immediately whenever earth-disturbing activities have permanently or temporarily ceased on any portion of the Project site and will not resume for a period exceeding 7 calendar days. Temporary and permanent stabilization activities must be completed as soon as practicable, but no later than 7 calendar days after the initiation of stabilization.

As soon as practicable, but no later than 7 calendar days after the initiation of soil stabilization measures, the contractor is required to have completed:

I. For vegetative stabilization, all activities necessary to initially seed or plant the area to be stabilized; and/or

2. For non-vegetative stabilization, the installation or application of all such non-vegetative measures.

4.2 Temporary Stabilization If earth-disturbing activities cease for a period exceeding 7 calendar days, on a portion of the project, and temporary stabilization becomes necessary. an annual grass (e.g., wheat, rye) will be planted in accordance with specifications outlined in Appendix H.

If seeding alone is not sufficient to control for erosion, then an erosion control blankets (ECB) may be used as a structural control. Staples, pins, or stakes must be used to limit movement or displacement of the ECB. ECBs should consist of natural fibers or be UV-degradable over time and should be used with caution in certain areas because the blanket netting may pose a threat to certain wildlife species if they become entangled in the netting matrix. Installation and maintenance details for ECBs are provided in Appendix H.

4.3 Final Stabilization The Project is considered finally stabilized when all soil-disturbing activities have been completed and a uniform (i.e., evenly distributed, without large bare areas of IO square feet or greater) perennial vegetative cover with a density of 70 percent of the native background vegetative cover for the area has been CERT 4-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Controls - Stabilization Practices established on all unpaved areas. For those areas not covered by permanent vegetation control measures, an equivalent permanent stabilization measure (e.g., riprap, gabions, or geotextiles) must be used.

4.4 Permanent Vegetative Cover Permanent sodding, or seeding and mulching, will occur on disturbed areas within the Project site where construction has terminated. The contractor must submit its seeding plan and mixture to Bums &

McDonnell for approval prior to restoration activities. Bums & McDonnell is specifying that the contractor apply the seed in accordance with Oklahoma Department of Transportation Commission specifications.

Areas of soil disturbance may need supplementation from fertilizer prior to establishing vegetative cover.

Soil tests may be necessary to determine the most appropriate fertilizer for each location. Fertilizer must be applied in amounts consistent with manufacturer's specifications, Any departures from the specifications must be documented. Fertilizer shall be applied at the appropriate time of the year and timed to coincide as closely as possible with the period of maximum vegetation uptake and growth.

Fertilizer shall not be applied before heavy rains, in stormwater conveyance channels, or on frozen ground. All local, State, and Federal requirements regarding fertilizer application shall be followed.

CERT 4-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Other Controls 5.0 OTHER CONTROLS The following sections detail other controls to be implemented during the Project construction activities to limit the potential for pollutants and sediment to reach waters of the State.

5.1 Natural Vegetated Buffer When land-disturbing activities will occur within an ARC corridor, a natural vegetated buffer of at least 100 feet is required along all perennial and intermittent streams; a 50-foot vegetated buffer is required along all ephemeral streams and drainages. No disturbance is expected to take place within the vegetated buffers established in the ARC corridor, and erosion and sediment control BMPs (Chapter 3 .0) will be implemented to limit sedimentation in the Cimarron River.

5.2 Dust Control Preventative measures will be taken during times of extreme drought or heavy winds when exposed soil is susceptible to wind erosion. In areas where bare soil is exposed, water or other approved and acceptable dust palliatives will be applied to the soil to limit wind erosion. Precautions should be taken not to over-water and erode soils. In addition, appropriate speed limits will be established within the Project site to limit the generation of dust. Spoil piles should be temporarily stabilized or covered to limit wind erosion.

5.3 Waste Materials Solid and liquid waste (including sediment, asphalt, concrete millings, floating debris, paper, plastic, fabric, and construction and demolition debris) must be disposed of in accordance with applicable disposal requirements and regulations. Solid or liquid wastes must not be disposed of onsite (e.g., buried or poured), but must be taken offsite for proper disposal. Waste container lids must be closed during precipitation events when not in use, when there is a significant chance of precipitation, and/or when the site is inactive or work is not in progress. If the waste container does not have a lid or could leak, other means to limit discharge of pollutants are required (e.g., cover with a tarp, place under a temporary roof, provide secondary containment). Waste containers must be inspected regularly, and waste stored onsite will be kept from contacting stormwater to the extent practicable.

5.4 Sanitary Waste Contractors and subcontractors must comply with local and State portable toilet regulations. Each contractor or subcontractor must provide sanitary facilities for its crews on the Project site for the duration of construction activities. These must not be placed in low-lying areas or near a waterbody and must be CERT 5-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Other Controls positioned so they are secure and cannot be tipped over. Sanitary facilities should be used by construction personnel and must be serviced regularly by a licensed contractor.

5.5 Hazardous Waste Hazardous or toxic waste must be separated from construction and domestic waste and must be stored in sealed containers constructed of suitable materials to prevent leakage or corrosion. These containers should be stored within appropriately sized secondary containment. Hazardous waste material must be disposed of in the manner specified by the manufacturer and by local, State, and Federal regulations.

Spills must be cleaned up immediately and in accordance with protocols outlined in Chapter 7.0. Site personnel must be made aware of these requirements.

CERT 5-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Maintenance and Inspection 6.0 MAINTENANCE AND INSPECTION Routine maintenance and inspection of BMPs is essential to minimizing erosion and sedimentation on the Project site and protecting the water quality of receiving streams.

6.1 Inspection Procedures A qualified person knowledgeable in the principles and practice of erosion and sediment control BMPs and pollution prevention, and who possesses the skills to assess construction site conditions that could impact water quality, is responsible for conducting regular inspections. Table 6-1 will identify personnel responsible for performing inspections prior to the start of construction, and a copy will be kept onsite.

The Project site must be inspected at a minimum, once every 7 calendar days, within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the end of a storm event 0.5-inch or greater, and within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of a discharge generated by snowmelt.

Table 6-1: Stormwater Inspector Identification List Personnel Title Contact Responsibility Jody Weikart Staff Geologist (513) 490-5331 Lead Inspector Eric Dulle Senior Environmental (314) 682-1657 Back-up Inspector Engineer 6.1.1 Areas Requiring Inspection The following areas must be routinely inspected:

  • Areas that have been cleared, graded, or excavated and have not yet achieved final stabilization
  • Stormwater controls, including pollution prevention measures
  • Material, waste, borrow, or equipment storage and maintenance areas
  • Areas where stormwater typically flows within the site, including drainages designed to divert, convey, and/or treat stormwater.
  • Points of discharge
  • Locations where stabilization measures have been implemented 6.1.2 Inspection Requirements During site inspections, the inspector must complete the following actions:

CERT 6-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Maintenance and Inspection

  • Check whether all erosion and sediment controls and pollution prevention controls are installed and operational, and determine if controls require replacement, repair, or maintenance.
  • Check for the presence of conditions that could lead to spills, leaks, or other accumulations of pollutants.
  • Identify locations where new or modified stormwater controls are necessary to meet the requirements of Parts 3 .3 and 3 .4 of the Permit.
  • Check discharge points and banks of any surface waters flowing within the Project boundaries or adjacent areas for signs of visible erosion and sedimentation that are attributable to site discharge; if discharge points are not accessible, check nearby downstream locations to the extent practicable.
  • Identify incidents of noncompliance.
  • If discharge is occurring at the time of an inspection:

o Identify all points of the property from which a discharge occurs.

o Observe and document the visual quality of the discharge (color, odor, oils, suspended solids, and other stormwater pollutants).

o Document whether stormwater controls are operating effectively and note controls that are not operating effectively.

  • Inspect locations where vehicles enter or exit the Project site for evidence of offsite sediment tracking along public paved roadways.

In areas of the Project site where construction activities have permanently or temporarily ceased and will not resume for a period exceeding 7 calendar days, stabilization measures must be initiated immediately.

The inspection frequency may be reduced to once per month in areas where seeding has been completed, appropriate non-vegetative cover ( e.g., hydromulch, erosion control blankets) has been provided, or temporary, non-vegetative stabilization (e.g., riprap, geotextiles, gabions) has been installed. Inspections shall immediately increase to the standard frequency if construction activities resume.

6.1.3 Inspection Report A report summarizing each inspection must be prepared including:

  • Inspection date
  • Name and title of the person making the inspection
  • Summary of inspection findings
  • Rain gauge or weather station precipitation CERT 6-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Maintenance and Inspection

  • Description of site location if an inspection cannot be completed due to unsafe conditions
  • Failures of stormwater controls and documenting photographs Inspection reports and records must be maintained onsite until the Project is complete and stabilized.

Reports must be maintained for a minimum period of 3 years from the date the Project site is finally stabilized. A copy of the Inspection and Maintenance Report Form is provided in Appendix I.

Each inspection record must be signed in accordance with OKR 10 Part 6. 7.2 and must be filed and made available onsite.

6.2 SWP3 Staff Training SWP3 staff training will be conducted by Mr. Lux or his designee prior to the start of earth-disturbing activities. Personnel with the following responsibilities must be trained to understand the requirements of this SWP3:

  • Design, installation, and maintenance/repair of stormwater controls
  • Application and storage of chemicals
  • Taking corrective actions Personnel must also be trained to understand:
  • The location and the maintenance requirements for each stormwater control
  • The pollution prevention requirements outlined in this SWP3
  • How to conduct inspections, record applicable findings, and take necessary corrective actions 6.3 Corrective Action In all circumstances, reasonable methods must be implemented immediately to minimize or limit the discharge of pollutants until a permanent solution is installed and made operational. This includes repairing, modifying, or replacing any stormwater control used on the Project site and the cleanup and disposal of spills and releases. For any of the following conditions, a new or modified control must be installed no later than 7 calendar days from the discovery of any of the following:
  • A required stormwater control was never installed or was installed incorrectly.
  • A stormwater control is not effective enough for the discharge to meet applicable water quality standards.
  • A prohibited discharge (OKRI0 Parts 3.1 and 3.3.3.A) is occurring or has occurred.

CERT 6-3 Burns & McDonnell

Stormwater Pollution Prevention Plan Maintenance and Inspection If it is infeasible to complete the repair or installation within 7 calendar days, then documentation must be provided as to why it was infeasible during the 7-day timeframe.

For each corrective action taken, a corrective action report must be completed and filed within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

The corrective action report must include:

  • Condition
  • Nature of the condition
  • Date and time at which the condition was found Within 7 calendar days of discovering the occurrence, a secondary written record must be completed that includes:
  • Follow up actions
  • A summary of modifications that were taken or need to be taken
  • Notice of whether SWP3 modifications are necessary If inspection results indicate a need to modify the SWP3, the plan will be revised and implemented, as appropriate, within 7 calendar days following the inspection. Modifications must be noted on the Record of Revision form and the Corrective Action Log form located in Appendix I. The inspection reports must identify incidents of noncompliance with the Permit.

6.4 Distribution List When revisions to the SWP3 are made, they must be noted on the Record of Revisions form and distributed to the individuals listed in Table 6-2 so that all copies of the SWP3 are up-to-date. Table 6-2 will be completed as individuals are identified.

Table 6-2: Distribution List Name Company CERT 6-4 Burns & McDonnell

Stormwater Pollution Prevention Plan Spill Prevention and Control 7.0 SPILL PREVENTION AND CONTROL This chapter describes measures to prevent, control, and minimize impacts from a spill of a hazardous, toxic, or petroleum substance during construction of the Project. It also describes the transport, storage, and disposal procedures for the potentially hazardous materials to be used on the Project site and outlines the procedures to be followed in the event of a spill of a contaminating or toxic substance.

As per 40 Code of Federal Regulations (CFR) 112, a Spill Prevention, Control, and Countermeasure Plan (SPCC Plan) must be prepared if the Project site will have 1,320 gallons or more of petroleum storage capacity in 55-gallon-sized or larger containers. This includes temporary tanks or fueling trucks used to "store" petroleum onsite. The truck would be subject to the SPCC Plan rules when parked on the construction site and used for "storage."

If the cumulative petroleum quantity stored onsite by a contractor or subcontractor exceeds 1,320 gallons, then the contractor or subcontractor must maintain a certified SPCC Plan in accordance with 40 CFR 112.

7 .1 Materials Management Practices The proper use and storage of materials and equipment greatly reduce the potential for contaminating stormwater runoff. The following list of good housekeeping practices should be implemented during the Project:

  • Hazardous materials, chemicals, fuels, and oils should not be stored within 100 feet of a stream bank, wetland, water supply well, spring, or other waterbody.
  • Fueling of construction equipment should not be conducted within 100 feet of a stream bank, wetland, water supply well, spring, or other waterbody.
  • The minimum amount of hazardous or toxic materials should be stored onsite.
  • Onsite materials should be stored in a neat, orderly manner, in appropriate containers, and under a roof or other enclosure.
  • Products should be kept in original containers with the original manufacturer's label.
  • Substances should not be mixed with one another unless recommended by the manufacturer.
  • Whenever possible, a container's contents should be used completely prior to container disposal.
  • If surplus product must be disposed of, then the manufacturers' and local- and State-recommended methods for proper disposal should be followed.

CERT 7-1 Burns & McDonnell

Stormwater Pollution Prevention Plan Spill Prevention and Control 7.1.1 Non-Petroleum Products Due to the chemical makeup of specific products, certain handling and storage procedures are required to promote the safety of handlers and limit the possibility of pollution. Care should be taken to follow directions and warnings for products used on the Project site. Pertinent information can be found on the Safety Data Sheet (SOS) for each product. The SOS must be kept onsite.

7.1.2 Petroleum Products Onsite vehicles should be monitored for leaks and receive regular maintenance to reduce the chance of leakage. Inspections for leaks or spillage must occur during the inspection of BMPs. Petroleum products must be stored in tightly sealed, clearly labeled containers. If feasible, the containers should be stored in a covered truck or trailer that provides secondary containment.

Bulk storage tanks with a capacity of greater than 55 gallons must have secondary containment.

Containment can be provided by temporary earthen berms lined with plastic sheeting or other means approved by Burns & McDonnell. After each rainfall event, the site inspector must inspect the contents of the secondary containment area for excess water. If no sheen is visible, then the collected water can be pumped to the ground in a manner that does not cause scouring. If sheen is present, then the water must be treated prior to discharge or must be transported and disposed of offsite in accordance with local, State, and Federal requirements.

Bulk fuel or lubricating oil dispensers should not have a self-locking mechanism that allows for unsupervised fueling. Fueling operations should be observed to immediately detect and contain spills.

No waste oil or other petroleum-based products will be disposed of onsite (e.g., buried or poured), but must be taken offsite for proper disposal.

7 .2 Spill Response In addition to the material management practices discussed previously, the following spill control and cleanup practices must be used to limit stormwater pollution in the event of a spill.

  • Contractors and subcontractors must make onsite personnel aware of cleanup procedures and the location of spill equipment.
  • Spills must be contained and cleaned up immediately after discovery.
  • Manufacturer's methods for spill cleanup of a material must be followed, as described on the material ' s SOS.

CERT 7-2 Burns & McDonnell

Stormwater Pollution Prevention Plan Spill Prevention and Control

  • Materials and equipment needed for cleanup procedures must be kept readily available onsite, either at an equipment storage area or on contractors' or subcontractors' trucks; equipment to be kept onsite will include, but not be limited to, brooms, dust pans, shovels, granular absorbents, sand, sawdust, absorbent pads and booms, plastic and metal trash containers, gloves, and goggles.
  • Toxic, hazardous, or petroleum product spills, required by regulation to be reported, must be documented to the appropriate Federal, State, and local agencies.
  • Spills must be documented, and a record of spills must be kept with this SWP3.

The Federal reportable spill quantities for hazardous materials are listed in 40 CFR Part 302.4, List of Hazardous Substances and Reportable Quantities. A procedure for determining a reportable spill is included in Appendix J of this SWP3 , along with a copy of the Spill Report Form to be completed in the event of a reportable spill. The reportable spill quantities for hazardous materials in the State of Oklahoma follow the Federal reportable quantities listed in 40 CFR Part 302.4.

If a spill occurs onsite, then the contractor's or subcontractor's superintendent must initiate initial spill response, including measures to localize the spill impact via containment. The contractor's or subcontractor's superintendent must notify Mr. Lux (Table 1-1 ), within 15 minutes of discovering a spill.

Mr. Lux will coordinate spill response procedures to document the spill and provide the contractor guidance and support necessary to remediate the spill. Mr. Lux will then contact the following authorities, as necessary:

  • Federal o National Response Center: (800) 424-8802 or (202) 267-2675 o EPA (Region 6) 24-hour Emergency Response Center: (866) 3 72-7745
  • State o Oklahoma DEQ, Environmental Complaints Program: (800) 522-0206 Additionally, a written description of the release must be submitted to the permitting authorities within 7 calendar days of knowledge of the release. The written description must include:
  • Description of the release, including the date of the release, the type of material, and the estimated quantity of the spill.
  • Circumstances leading up to the release
  • Description of the steps taken to prevent and control future releases CERT 7-3 Burns & McDonnell

APPENDIX A - GENERAL PERMIT GENERAL PERMIT OKRl0 FOR STORMWATER DISCHARGES FROM CONSTRUCTION ACTIVITIES WITHIN THE STATE OF OKLAHOMA OKLAHOMA DEPARTMENT OF ENVIRONMENTAL QUALITY WATER QUALITY DIVISION October 18, 2017 OKLAHOMA' DEPARTMENT OF ENVIRONMENTAL QUALITY

Stormwater General Permit for Construction Activities within the State of Oklahoma Permit No. OKRl0 Authorization to Discharge Under the Oklahoma Pollutant Discharge Elimination System (OPDES) Act In compliance with the Clean Water Act, as amended, (33 U.S.C. §1251 et. seq.) and the provisions in 40 Code of Federal Regulations (CFR) § 122.26, adopted and incorporated by reference in Oklahoma Administrative Code (OAC) 252:606 3(b)(3)(L), and under the OPDES Act, 27A O.S. 2-6-201 et seq., as amended, except as provided in Part 1.2.2 of this permit, Operators of stormwater discharges from construction activities (as defined in Part 8 of this permit), located in an area specified in Part 1.1, are authorized to discharge in accordance with the conditions and requirements set forth herein. Only those Operators of stonnwater discharges from construction activities in the general pennit area who submit a Notice of Intent (NOI) and receive an authorization to discharge in accordance with Part 2 of this permit are authorized under this permit.

This pennit is a reissuance by the Oklahoma Department of Environmental Quality {DEQ) and shall become effective on October 18, 2017. This Permit replaces the Permit issued on September 11, 20 12. This permit and the authorizations issued under the permit shaH expire at midnight, October 17, 2022.

Signed and issued this l 8th day of September, 2017

~J~. ~

Ir 'water Quality Division

~

Water Quality Division ager

GENERAL PERMIT OKRlO FOR STORMWATER DISCHARGES FROM CONSTRUCTION ACTIVITIES WITHIN THE STATE OF OKLAHOMA Table of Contents Subject Page No.

Part 1 Coverage Under This Permit ...................................................................................................................... 1 1.1 Permitting Authority ............................................................................................................................................. 1 1.1.1 Area of Coverage where EPA/Other Agency is the Permitting Authority ................................................. 1 1.1.2 EPA & Oklahoma Department of Agriculture, Food & Forestry (ODAFF) are the Permitting Authorities 1 1.2 Authorized Discharges ......................................................................................................................................... 1 1.2.1 Authorized Discharges ............................................................................................................................... 1 1.2.2 Limitations on Coverage ................................................................... .............. ............................................ 2 1.3 Obtaining Authorization ....................................................................................................................................... 4 1.4 Terminating Coverage .......................................................................................................................................... 5 Part 2 NOi and NOT Requirements *...................................................................................................................... 5 2.1 NO[ Requirements ................................................................................................................................................ 5 2.1.1 Operators .................................................................................................................................................... 5 2.1.2 Operator changed ........................................................................................................................................ 5 2.1.3 Late NOis .................................................................................................................................................... 5 2.1.4 Operators of on-going construction projects .............................................................................................. 5 2.1.5 Operators without the permitting coverage under the CGP issued on September 13, 2012 ...................... 6 2.1.6 Contents ofNOl .......................................................................................................................................... 6 2.1. 7 Modification of an NOi .............................................................................................................................. 7 2.2 NOT Requirements .................................................. ............................................................................................. 7 2.2.1 Contents of NOT ........................................................................................................................................ 7 2.2.2 Elimination of Stormwater Discharged ........................................... ........................................................... 8 2.2.3 Notification of Change of Ownership (NCO) ............................................................................................ 8 2.3 Where to Submit ................................................................................................................................................... 8 2.4 SWP3 Submittal ................................................................................................................................................... 8 2.5 Electronic Reporting Deadline ............... .............................................................................................................. 8 Part 3 Special Conditions and Effluent Limitations ............................................................................................. 8 3 .1 Non-Stormwater Discharges ................................................................................................................................ 8 3 .2 Releases in Excess of Reportable Quantities ....................................................................................................... 9 3 .3 Non-Numeric Technology-Based Effluent Limitations ........................................................................................ 9 3.4 Numeric Technology-Based Effluent Limitation ............................................................................................... 16 3.5 Water Quality-Based Effluent Limitations ......................................................................................................... 17 3 .5. 1 Discharges to Waters Identified as Impaired Waters ............................................................................... 17 3.5.2 Discharges to Waters Identified as an ORW or ARC .............................................................................. 17 3 .6 Responsibilities of Operators ............................................................................................................................. 18 3 .6.1 Operational Control over Construction Plans and Specifications ............................................................ 18 3 .6.2 Operational Control over Day-to-Day Activities ..................................................................................... 19 3.6.3 Responsibilities of Operators at a Larger Common Plan of Development .............................................. 19 3.6.4 Responsibilities of the Operator of Utility Installation ............................................................................ 20 Part 4 Stormwater Pollution Prevention Plans (SWP3) ................................ .. .................................................... 20 4.1 General Requirements .............. .......... .. ......... .......................................................................................... ....... .... 20 4.2 Signature, Posting a Notice, Making Plans Available, and DEQ's Notification ....... .................................. ...... 21 4.3 Contents of SWP3 .............................................................................................................................................. 22 4.3.1 Stormwater Team ...................................................................................................................................... 22 4 .3 .2 Nature of Construction Activities ............................................................................................................. 22 4.3.3 Other Site Operators .............. .......................................................................................... ......................... 22 4.3 .4 Sequence and Estimated Schedule of Construction Activities: ................................................................ 22 4.3.5 Site Map .................................................................................................................................................... 22 4.3 .6 Construction Site Pollutants ..................................................................................................................... 23 4.3.7 A Copy of the Permit Requirements ......................................................................................................... 23 4.3.8 Measures to Protect ARC and ORW ........................................................................................................ 23 4.3.9 Federal, State or Local Historic Properties .............................................................................................. 23

4.3.10 Water Quality Impaired Water and TMDL Requirements ....................................................................... 24 4.3 .11 Stormwater Controls Description ............................................................................................................. 24 4.3.12 Maintenance ..................................................................................... ......................................................... 26 4 .3. 13 Inspections ...................................... .... .............................................................................. ... ..................... 26 4.3.14 Corrective Actions .................................................................................................................................... 28 4.3.15 Non-Stormwater Discharges .................................................... ................................................................. 29 4.3 .16 Staff Training Requirements .................................................................................................................... 29 4.3.17 NCOs for Individual Lots ......................................................................................................................... 30 4.3 .18 SWP3 Certification ........................ ........................................................................................................... 30 4.3.19 SWP3 Modification .................................................................................................................................. 30 4.3.20 On-Site Availability of the SWP3 .................................. ........................................................... ............... 30 4.4 Contractor Certifications .......................................................... ........................................ ............... ................... 30 Part 5 Retention of Records ....... ...................................... ................................................ ........................... ........ 3 1 5 .1 Documents ............................................. ............................................................ ................................................. 3 1 5 .2 Accessibility ....................................................................................................................................................... 31 5.3 Addresses ............................................................................................................................................................ 31 Part 6 Standard Permit Conditions ...................................................................................................................... 31 6.1 Duty to Comply .................................................................................................................................................. 31 6.2 Continuation of the Expired General Permit.. ... ................................................................................................. 32 6.3 Need to Halt or Reduce Activity Not a Defense ................................ .................................. ...... ........................ 32 6.4 Duty to Mitigate ....................................................................................................................... .......................... 32 6.5 Duty to Provide Information .............................................................................................................................. 32 6.6 Other Information ............................................................................................................................................... 32 6.7 Signatory Requirements ..................................................................................................................................... 33 6.8 Oil and Hazardous Substance Liability .............................................................................................................. 33 6.9 Property Rights ..... ................................................ .................................. .................................... ..... ....... ............ 34 6.10 Severability ....................................................................................................................................................... 34 6.11 Requiring an Individual Permit or an Alternative General Permit ................................................................... 34 6.12 State/Tribal Environmental Laws ..................................................................................................................... 34 6.13 Proper Operation and Maintenance .......... .................................................................................... .................... 35 6.14 Inspection and Entry ........................................................... ................................ .... ...... ........ ............... ............. 35 6.15 Permit Actions ....... .. .. ..... ........... ........ .................. ..................... ....... ....... ..................... ....................... .. ............ 35 Part 7 Re-opener Clause ..................................................... ... .................... .................. ..... ................................... 35 7.1 Potential to Cause or Contribute to a Violation ......... ....................... ............................................................ ..... 35 7 .2 Permit Modification or Revocation ....................................................... ......... ............ ................................. ....... 3 5 Part 8 Definitions ................................................................................................................................................ 3 5 Part 9 Historic Preservation ................................................................................................................................ 39 Part 10 Endangered Species ................................................... ............................................................................... 40 ADDENDUM A- OKLAHOMA AQUA TIC RESOURCES OF CONCERN (ARC) ......... ...................................... 43 ADDENDUM B -NOTICE OF INTENT ....................... .............. ............ ....................................... ........ .................... 4 7 ADDENDUM C - NOTICE OF TERMINATION ....................................................................................... ... ... ......... 51 ADDENDUM D - CONTRACTOR CERTIFICATION ............................................................................................. 53 ADDENDUM E - OUTSTANDING RESOURCE WATERS (OR W) ...................................................................... 54 ADDENDUM F -ADDITIONAL REQUIREMENTS FOR CONCRETE AND ASPHALT BATCH PLANTS ..... 55 ADDENDUM G - ANNUAL COMPREHENSIVE SITE COMPLIANCE EVALUATION REPORT .................... 61 ADDENDUM H - BUFFER REQUIRMENTS .................................................................................................... ...... 66 ADDENDUM I - STORMWATER RUNOFF COEFFICIENTS ............................................................................. .. 75 ADDENDUM J - NOTIFICATION OF CHANGE OF OWNERSHIP .................................................................. .... 76

OKRI0 Page 1 Part 1 Coverage Under This Permit 1.1 Permitting Authority Under the Environmental Protection Agency (EPA)'s approval of the OPDES program, DEQ has had stormwater permitting and enforcement responsibility for large and small construction activities since November 19, 1996, except for construction activities associated with oil & gas extraction and agricultural activity, or those construction activities located on Indian Country Lands.

1.1.1 Area of Coverage where EPA or Another Agency is the Permitting Authority:

A. Any Construction Activity on Indian Country Lands in Oklahoma; B. Construction activity associated with oil and gas extraction under the Standard Industrial Classification (SIC) Group 13, (Note: The DEQ has authority over the natural gas liquid extraction plants identified under SIC code 1321, and service company base operating stations identified under SIC code 1389. Any construction activities associated with facilities identified under SIC codes 1321 and 1389 are required to be covered under this permit); Pipelines under SIC Group 46, except pipelines within certain facilities regulated by DEQ; Natural gas transmission under SIC Group 492, except that the DEQ has jurisdiction over natural gas liquid extraction plants; and C. Construction activities associated with Agricultural production and services under SIC Groups O1, 02 and 07; Forestry under SIC Group 08; Fishing, hunting and trapping under SIC Group 09, except DEQ shall have jurisdiction over industry group number 092 (fish hatcheries and preserves).

1.1.2 EPA & Oklahoma Department of Agriculture, Food & Forestry (ODAFF) are the Permitting Authorities:

A. If you I desire an authorization to discharge stormwater from a construction activity associated with oil and gas extraction under the SIC Group 13, or pipelines under SIC Group 46, or natural gas transmission under SIC Group 492, you must apply for a permit through the EPA National Pollutant Discharge Elimination System (NPDES) eReporting Tool for its Construction General Permit (CGP); and B. If you are looking for permit coverage from construction activities associated with Agricultural and Forestry, Fishing production and services under SIC Groups 01, 02, 07, 08 and 09, you must contact ODAFF at (405)522-5493 and ask for AgPDES programs.

1.2 Authorized Discharges 1.2.1 Authorized Discharges A. Permittees are authorized to discharge pollutants in stormwater runoff associated with construction activities as defined in 40 CFR § 122.26 (b)(l4)(x) for construction sites of 5 or more acres, and 40 CFR §122.26 (b )(l 5)(i) for construction sites of more than one acre but less than 5 acres, including the disturbance of less than one acre of total land area that is part of a larger common plan of development or sale if the larger common plan will ultimately disturb land equal to or greater than one acre, and those construction site discharges designated by DEQ as needing a stormwater permit under 40 CFR § 122.26 (a)(l)(v), or under 122.26 (a)(9) and 122.26 (g)(l)(i). Discharges identified under Part 1.2.2 are excluded from coverage. Any discharge authorized by a different OPDES permit may be commingled with discharges authorized by this permit.

1 Terms like "you and/or "your" are used in this permit to refer to the party or parties that are facility, site or project owners/operators, applicants, Permittees, etc.

OKRl0 Page 2 B. This permit also authorizes storm water discharges from construction support activities (e.g., concrete or asphalt batch plants 2, equipment staging yards, material storage areas, excavated material disposal areas, and borrow areas) provided:

1. The support activity is directly related to a construction site that is required to have this permit coverage for discharges of stormwater associated with construction activity;
2. The support activity is not a commercial operation serving multiple unrelated construction projects by different operators, and does not operate beyond the completion of the construction activity at the last construction project it supports;
3. Appropriate controls and measures are identified in a Stormwater Pollution Prevention Plan (SWP3) covering the discharges from the support activity areas; and
4. The support activity is not located within the watershed of an Outstanding Resource Water (as defined in Part 8.25 and Addendum E of this permit).

C. The following allowable non-stormwater discharges associated with construction activity are authorized by this permit:

1. Fire hydrant flushing;
2. Waters used to wash vehicles and equipment where soaps, solvents or detergents are not used;
3. Water used to control dust;
4. Potable water, including uncontaminated waterline flushing;
5. Routine external building wash-down that does not use soaps, solvents and/or detergents and/or building wash-down from external surfaces that does not contain leachable hazardous substances (e.g., paint or caulk containing polychlorinated biphenyls (PCBs));
6. Pavement washing waters, provided spills or leaks of toxic or hazardous substances, have not occurred (unless all spilled material has been removed) and where soaps, solvents and detergents are not used;
7. Uncontaminated air conditioning or compressor condensate;
8. Uncontaminated ground water or spring water;
9. Foundation or footing drains where flows are not contaminated with process materials such as solvents or contaminated ground water;
10. Landscape irrigation;
11. Discharge or flows from emergency firefighting activities will be allowed. Measures shall be taken by the permittee or site/facility, as soon as practicable, to reduce any such pollutant releases to avoid or minimize the impacts on water quality and to ensure public health and safety;
12. Uncontaminated flows from excavation dewatering activities will be allowed if operational and structural controls are used to reduce any pollutant releases in order to avoid or minimize the impacts on water quality (see Part 3.3.1.M of this permit). These controls must be included in your SWP3.

D. This permit authorizes stormwater discharges associated with any construction activities from the facilities that are currently regulated under OPDES Act, such as Natural Gas Liquid Extraction Plans (SIC code 1321) and Oil and Gas Field Services for Company Base Operating Stations (SIC code 1389).

1.2.2 Limitations on Coverage A. Post Construction Discharges: This permit does not authorize stormwater discharges that originate from the site after construction activities have been completed and the site, including any temporary support activity site, has undergone final stabilization and has an approved NOT. Industrial post-construction stormwater discharges may need to be covered by a separate OPDES permit.

B. Discharges Mixed with Non-Stormwater: This permit does not authorize discharges that are mixed with sources of non-stormwater, other than those discharges that are identified in Part 1.2.1.C and are in compliance with Part 4.3 .15 of this permit.

2 Discharges subject to a numeric effluent limitation guideline in Part 3 .4 "Numeric Limitation and Sampling Requirements" and Addendum F "Additional Requirements for Concrete and Asphalt Batch Plants" of this permit.

OKRI0 Page 3 C. Discharges Covered by Another Permit: This permit does not authorize stormwater discharges associated with construction and/or construction support activity that have been covered under an individual permit or which require coverage under an alternative general permit in accordance with Part 6.11, except stormwater discharges from concrete and asphalt batch plants specified in Part 1.2.1.B of this permit.

D. Discharges Threatening Water Quality: This permit does not authorize stormwater discharges from construction sites that DEQ determines will cause, or have reasonable potential to cause or contribute to violations of water quality standards, including anti-degradation policy. Where such determinations have been made, DEQ may notify the operator(s) that an individual permit application is necessary in accordance with Part 6.11. However, DEQ may authorize coverage under this permit after appropriate controls and implementation procedures designed to bring the discharges into compliance with water quality standards have been included in the S WP3.

E. Discharges Not Protective of Listed Endangered Species: This permit does not authorize stormwater discharges, allowable non-stormwater discharges, and stormwater discharge-related activities that are not protective of Federal and State listed endangered and threatened species or designated critical habitat. See Part 10 for more information.

1. For the purposes of complying with Part 1.2.1.B, stormwater discharge-related activities (as defined in Part 8.34 of this permit) include:
a. Activities that cause, contribute to, or result in point source stormwater pollutant discharges, including but are not limited to excavation, site development, grading, and other land disturbing activities; and
b. Measures to control stormwater including the siting, construction, and operation of Best Management Practices (BMPs) to control, reduce, or prevent stormwater pollution.
2. Coverage under this permit is available only if the applicant certifies that it meets at least one of the criteria in paragraphs a, b, c, d, ore below. Failure to continue to meet one of these criteria during the term of the permit will render an applicant ineligible for coverage under this permit.
a. The proposed construction site or land disturbing activity is not located within any of the corridors of the Federal or State identified Aquatic Resources of Concern (ARC), and further investigation is not required.
b. The proposed construction site or land disturbing activity is located within a corridor of a Federal or State identified ARC. Operators must implement an SWP3 that specifies the measures to be employed to protect the endangered or threatened species or their critical habitat (see Parts 3.5.2 and 10.2 Step 2).
c. If one of those eligibility criteria under part 1.2.2.E.2.b, d, or e cannot be met, applicants may use Addendum H of this permit to evaluate alternatives of buffer requirements and select equivalent sediment controls or contact DEQ for further consultation; or
d. The applicant's federally approved construction activities are authorized by the appropriate Federal or State agency and that authorization addresses the Endangered Species Act Section 7 consultation for the stormwater discharge or stormwater discharge-related activities. Applicants selecting option d must include documentation from U.S. Fish and Wildlife Service (USFWS) or a qualified biologist that demonstrates Section 7 consultation has been completed. The SWP3 must comply with any conditions resulting from that consultation.
e. The applicant's stormwater discharges and stormwater discharge-related activities were already addressed in another operator's certification of eligibility under Part 1.2.2.E.2.b, c, or d. that included the applicant's project area. By certifying eligibility under Part 1.2.2.E.2.e, the applicant agrees to comply with applicable measures or controls upon which the other operator's certification under Part 1.2.2.E.2.b, c. or d. was based.
3. The applicant must comply with any applicable terms, conditions, or other requirements developed in the process of meeting the requirements of Part 1.2.2.E.2.b, c, d, or e above to remain eligible for coverage under this permit. Such terms and conditions must be incorporated in the applicant's SWP3.

OKRI0 Page 4

4. This permit does not authorize any stormwater discharges where the discharges or stormwater discharge-related activities cause a prohibited "take" (as defined in Part 8.35) of endangered or threatened species.
5. This permit does not authorize any stormwater discharges where the discharges or storm water discharge-related activities are likely to jeopardize the continued existence of any species that are listed or proposed to be listed as endangered or threatened or result in the adverse modification or destruction of habitat that is designated or proposed to be designated as critical.

F. New Sources or New Discharges: New sources or new discharges of constituents of concern to impaired waters are not authorized by this permit unless otherwise allowable under OAC 252:606 and applicable state law. Impaired waters are those that do not meet applicable water quality standards and are listed on the Clean Water Act Section 303(d) list. Pollutants of concern are those constituents for which the waterbody is listed as impaired. The 303(d) list ofimpaired Waters can be found in Appendix C of Oklahoma's Integrated Report on the DEQ web site at http://www.deq.state.ok.us/W0Dnew/305b 303d/index.html, or the DEQ GIS Map and Data Viewer at http://deq.maps.arcgis.com/home/index.html.

G. Discharges to Total Maximum Daily Load (TMDL) Watersheds: Discharges of pollutants of concern to impaired waterbodies for which there is an approved TMDL or a watershed plan incorporated in Oklahoma's Water Quality Management Plan in lieu of a TMDL are not eligible for coverage under this permit unless they are consistent with the approved TMDL or watershed plan or local compliance plan.

Applicants must comply with the requirements in Part 4.1.5 of this permit.

1.3 Obtaining Authorization 1.3 .1 In order for storm water discharges from construction activities to be authorized under this permit, an operator must:

A. Meet the authorized discharge requirements in Part 1.2 of this permit; B. Except as provided in Part 2.1.4 of this permit, prior to NOI submittal, develop a SWP3 covering either the entire site or all portions of the site where they are operators (as defined in Part 8.23) according to the requirements in this permit. A "joint" SWP3 may be developed and implemented as a cooperative effort where there is more than one operator at a site. You are required to submit a copy of your complete SWP3 to DEQ for review if your discharges meet the special conditions listed in Part 2.4 of the permit. If your discharges do not meet the special conditions listed in Part 2.4 of the permit, you are not required to submit a copy of the SWP3 when you submit your NOL However, you may be required to submit an SWP3 for review upon request by DEQ.

C. Submit a Notice of Intent (NOI) available in Addendum B of this permit. Only one NOI need be submitted to cover all of the Operator's activities on a common plan of development or sale (e.g., you do not need to submit a separate NOi for each separate lot in a residential subdivision or for two separate buildings being constructed at a manufacturing facility, provided the SWP3 covers each area for which you are an operator).

The SWP3 must be implemented upon commencement of construction activities.

D. Pay the applicable application fee and annual permit fee established in OAC 252:606 OPDES Standards. An invoice of the permit fee due will be sent to you if the fee is not included with the NOI or upon your request.

E. Receive an authorization from DEQ. The fee must be received before the Operator's authorization can be issued.

1.3.2 Any new operator on site, including those who replace an operator who has previously obtained permit coverage, must submit an NOI to obtain permit coverage.

1.3 .3 Once authorization is issued by DEQ, you are authorized to discharge stormwater from construction activities under the terms and conditions of this permit. DEQ may deny coverage under this permit and requires submittal of an application for an individual OPDES permit based on a review of the NOI or other information (see Part 6.11 of this permit).

OKRl0 Page 5 1.4 Terminating Coverage 1.4.1 Permittees wishing to terminate coverage under this permit must submit a Notice of Termination (NOT) available in Addendum C of the permit. The permittee's authorization to discharge under this permit will be terminated when DEQ's termination letter has been issued. (see Part 2.2 of the Permit) 1.4.2 All permittees must submit an NOT within 30 days after one or more of the following conditions have been met:

A. Final stabilization (as defined in Part 8.31 of this Permit) has been achieved on all portions of the site for which the permittee is responsible (including, if applicable, returning agricultural land to its pre-construction agricultural use);

B. For residential subdivision only: final stabilization has been completed and the ownership of all lots has been transferred to new owners and the permittee is no longer responsible for the construction activities for the subdivision. A Notification of Change of Ownership (NCO) has been signed, and included in the SWP3 (see also Parts 2.2 of this Permit); and C. When another operator has assumed control according to Part 6.7.3 over all areas of the site that have not been finally stabilized. The NOT must be submitted with the new operator's NOi; 1.4.3 DEQ will review NOTs for completeness and accuracy and inspect the site for which the NOT was submitted within 30 days of receipt of the NOT.

Upon completing the inspection, DEQ will notify the permittee of any needed changes to the site conditions, or that the site has met the termination requirements under this permit. Only one NOT Form can be submitted to DEQ within a 90-day period. Additional compliance inspections may occur within this 90-day period at the discretion of DEQ.

Part 2 NOi and NOT Requirements 2.1 NOi Requirements

2. 1. 1 Operators Parties defined as operators (as defined in Part 8.23 of this Permit) due to their operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications and/or operators with day-to-day operational control over construction activities at a project, must ensure that they are in compliance with all permit conditions, including their SWP3s and receive authorization from DEQ prior to the commencement of construction activities (i.e., the initial disturbance of soils associated with clearing, grading, excavation activities, or other construction activities).

2.1 .2 Operator changed For stormwater discharges from construction projects where the operator changes, including instances where an operator is added after an NOI has been submitted under Part 2.1.1 of this permit, the new operator must submit an NOI at least 2 days before assuming operational control over site specifications or commencing work on-site.

2.1.3 Late NOis Operators are not prohibited from submitting late NOis. When a late NOi is submitted, authorization is only for discharges that occur after permit coverage is granted. DEQ reserves the right to take appropriate enforcement action for any unpermitted activities that may have occurred between the time construction commenced and authorization of future discharges is granted.

2.1.4 Operators of on-going construction projects Operators of on-going construction projects as of the effective date of this permit that received authorization for stormwater discharges under the COP OKRl0 issued on September 13, 2012, must:

OKRl0 Page 6 A. Submit an NOI within 90 days of the effective date of this permit. If the permittee is eligible to submit an NOT (e.g., construction is finished and final stabilization has been achieved) before the 90 th day, a new NOi is not required to be submitted. Operators must remain in compliance with the requirements of the CGP OKRl0, issued on September 13, 2012, until a new authorization is received or an NOT is submitted; B. Update the SWP3 to comply and implement with the requirements of this permit prior to NOI submittal within 90 days after the effective date of this permit; and C. Pay the applicable application fee and annual permit fee established in OAC 252:606 (also see Part 1.3.1.D of this permit).

2. 1.5 Operators without the permitting coverage under the CGP issued on September 13, 2012 Operators of on-going construction projects as of the effective date of this permit that did not receive authorization to discharge under the CGP issued on September 13, 2012, who wish to discharge under this permit, must submit an NOI and obtain authorization under this permit. Prior to NOi submittal, an SWP3 must be developed and implemented to comply with the requirements of this permit. However, DEQ reserves the right to take appropriate enforcement action for any unpermitted activities that may have occurred between the time construction commenced and authorization of future discharges is granted.

2.1.6 Contents ofNOI The NOI form shall include the following information:

A. Indicate whether this is a new application or modification or renewal of your NOi, including your authorization number if this is a modification or renewal; B. Provide the legal name, mailing address, and phone number of the company/firm, public organization, or any other entity operator filing the NOI for permit coverage; C. Provide name, title, phone number and email address for the Operator's point of contact; D. Provide the site/project's official name, phone number and street address or general location information (e.g., intersection of State Highway 61 and 34);

E. Provide the name, title, phone number, and email address for the site/project's point of contact; F. Indicate the purpose of the project (i.e. residential subdivision, commercial building, road and/or bridges, wind farm, etc.);

G. Provide Latitude and Longitude of the construction project or site at the center of the site (or latitude and longitude at the starting and ending points if it is a linear construction site). Latitude and longitude can be obtained from DEQ, and USGS's websites or other mapping tools; H. Provide estimated construction project starting date and ending date. The dates must be provided in MM-DD-YYYY where MM is the month, DD is the date and YYYY is the year; I. Provide total area of construction site and estimated area to be disturbed in acres; J. Provide total impervious area (pre-construction) and total impervious area construction completed (post-construction) in acres; K. Provide post-construction runoff coefficient of the site. Operator may use recommended runoff coefficients in Addendum I of this permit. Average coefficients for composites area may be calculated on an area weighted basis from C=ICiAi([Ai where Ci is the coefficient applicable to the area Ai; L. Describe the nature of fill material and existing data describing soils (i.e., coarse-grained soils: gravels, sands, or fine-grained soils: silts and clays, silts and clays, and highly organic soils etc.) Operator may use soil classification chart in Attachment A of Addendum H to determine the types of the soils on the site; M. Indicate whether this site/project is part of common plan of development or sale; N. Based on the instructions in Part 10 and Addendum A of this permit, operators must determine whether the construction site or land disturbing activity is within the specified corridor of a Federal or State ARC by selecting a, b, c, d, ore of Part 1.2.2.E.2;

OKRl0 Page 7

0. Indicate whether the site/project discharges stormwater to a Municipal Separate Storm Sewer System (MS4);

P. Identify all the receiving waterbodies from the sites that discharge stormwater, including names of the waterbodies; Q. Indicate whether the receiving waterbodies are included on DEQ' s 303(d) list of impaired waterbodies, including the pollutant(s) for which the waterbody is impaired; R. Indicate whether the stormwater discharges drain to a waterbody or watershed with an approved or established TMDLs, or watershed plan, or local compliance plan. Additional site specific requirements may be applicable if the site is located in such waterbody or watershed; S. Indicate whether the SWP3 has been prepared and is available on site; T. Indicate whether this operator is registered with the Secretary of State of Oklahoma; U. Describe the proposed measures, including BMPs, to control pollutants in stormwater discharges during construction, including a brief description of applicable erosion and sediment control requirements; and V. Describe the proposed measures to control pollutants in stormwater discharges that will occur after construction operations have been completed, including a brief description of applicable erosion and sediment control requirements.

2.1. 7 Modification of an NOI After issuance of an authorization, an amended NOI shall be submitted by a permittee if circumstances change (e.g. the area to be disturbed has increased from 20 acres to 40 acres). However, an amended NOI should not be submitted if the area to be disturbed has decreased (e.g., changed from 40 acres to 20 acres).

The amended NOI shall include the facility's assigned permit number and a description of the requested change.

The original authorization number will be retained. DEQ will provide an acknowledgement by mail or email that the amended NOI has been received and processed. Permittees must update their SWP3s to reflect the modification.

2.2 NOT Requirements Permittees must submit a completed NOT that is signed in accordance with Part 6.7 of this permit when one or more of the conditions contained in Part 1.4.2 of this permit have been met at a construction site. The permittee must use the NOT form found in Addendum C of this permit.

2.2.1 Contents ofNOT A. Identify the OKR 10 permit number for the stormwater discharge on the site; B. Indicate whether the construction activities on the site have been terminated and final stabilization has been completed or the permittee is no longer an operator at the site; C. Provide the legal name, mailing address, phone number and email address of the operator submitting the NOT; D. Provide the legal name of the site or project and address (or a description of the general location if no street address is available) of the construction site; E. Provide latitude and longitude of the construction site (at center of the site). Latitude and longitude can be obtained online at DEQ's, and/or USGS's websites and/or from other mapping tools; F. Include a copy of the updated site map showing all completed and final plans and projects (i.e., aerial images or general site maps with project extents marked, including stabilized areas of concrete or asphalt batch plants, equipment staging yards, stockpile, borrow areas, wash-out areas, previously disturbed areas, etc.);

and G. Provide a copy of NCO (see Part 2.2.3 of this permit) for each new owner/operator to whom you have sold a portion of the site. Where indicated on your NOT and NCO forms, you must include the new

OKRI0 Page 8 owner/operator's contact information, including their name, street address, phone number and email address.

Each new owner/operator is also required to prepare and submit an NOi to DEQ for review. If applicable, you must submit all NCOs to DEQ prior to submittal of the NOT or submit the NOT along with all NCOs that have been prepared during the ownership transition.

2.2.2 Elimination of Stormwater Discharged Elimination of stormwater discharges associated with construction activity means that all disturbed soils at the portion of the construction site where the operator had control have been finally stabilized (as defined in Part 8.31 of this permit) and temporary erosion and sediment control measures have been removed, or that all stormwater discharges associated with construction activities from the identified site that are authorized by this permit have otherwise been eliminated from the portion of the construction site where the operator had control.

2.2.3 Notification of Change of Ownership (NCO)

The permittee shall not terminate their permit coverage until the new owners/operators of the individual lots within the larger common plan of development or sale are notified of their permitting requirements. The permittee must sign a NCO in Addendum J of this permit. The signed NCO shall be documented in the permittee's SWP3 and submitted to DEQ in accordance with Part 2.2. l.G of this permit.

2.3 Where to Submit All NOi, NOTs, and other documents required by this permit must be signed in accordance with Part 6. 7, and sent to the following address: Stormwater Unit of Environmental Complaints and Local Services (ECLS), Department of Environmental Quality (DEQ), 707 North Robinson Ave., P.O. Box 1677, Oklahoma City, OK 73101-1677, or Fax them to (405) 702-6226, or email them to ECLS-StormwaterPermitting@deg.ok.gov.

2.4 SWP3 Submittal You must submit a copy of your SWP3 along with your signed NOi if any of the following conditions apply:

2.4.1 Any area of your construction site or support activity is located within the watershed of an Outstanding Resource Water (as defined in Part 8.25 and Addendum E of this permit);

2.4.2 Any area of your construction site or support activity is located within an ARC area identified in Addendum A of this permit; 2.4.3 The area which is subject to approved TMDL or watershed plan or local compliance plan. For example, construction activities authorized after EPA approval of the TMDL which are located in the Lake Thunderbird watershed and required to (1) comply with any additional pollutant prevention of discharge monitoring requirements established by the local MS4 municipalities; (2) submit to the DEQ all Stormwater Pollution Prevention Plans (SWP3) for sites of 5 acres or larger.

2.4.4 The area to be disturbed in your construction site is 40 acres or more.

2.5 Electronic Reporting Deadline Commencing December 21, 2020, NOI/SWP3 and other documents must be electronically submitted to DEQ.

Instructions on how to access and use the appropriate electronic reporting tool will be made available on DEQ's website prior to the December 21, 2020 compliance deadline.

Part 3 Special Conditions and Effluent Limitations 3.1 N on-Stormwater Discharges 3 .1.1. Except as provided in Parts 1.2.1.B and C or 1.3 .2 and 3 .1.2 or 3 .1.3, all discharges covered by this permit shall be composed entirely of stormwater associated with construction activity;

OKRl0 Page 9 3.1.2 Discharges of material other than stormwater that are in compliance with an OPDES permit (other than this permit) issued for that discharge may be discharged or mixed with discharges authorized by this permit.

3.1.3 The non-stormwater discharges listed in Part 1.2.1.C of the permit are authorized by this permit provided the non-stormwater component of the discharge is in compliance with Part 3.15 of this permit.

3.1.4 This permit does not authorize the discharge of hazardous substances or oil resulting from an on-site spill.

3.2 Releases in Excess of Reportable Quantities The discharge of hazardous substances or oil in the stormwater discharge(s) from a facility shall be prevented or minimized in accordance with the applicable SWP3 for the facility. This permit does not relieve the permittee of the reporting requirements of 40 CFR Parts 110, 117 and 302.

Where a release containing a hazardous substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Parts 110, 117 or 302, occurs during a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period:

3 .2.1 Reporting a Reportable Spill The permittee is required to notify the National Response Center (NRC) at 800-424-8802 in accordance with the requirements of 40 CFR Parts 110, 117 and 302, and the DEQ Hotline at 800-522-0206 as soon as the discharge is discovered.

3 .2.2 SWP3 Requirements The SWP3 required under this permit must be modified within 14 calendar days of knowledge of the release to provide a description of the release, the circumstances leading to the release, and the date of the release.

In addition, the plan must be reviewed to identify measures to prevent the reoccurrence of such releases and to respond to such releases, and the plan must be modified where appropriate.

3.3 Non-Numeric Technology Based Effluent Limitations The stormwater control requirements in this part are the non-numeric technology-based effluent limitations that apply to all discharges from construction sites eligible for coverage under this permit. These requirements apply the national effluent limitations guidelines and new source performance standards found at 40 CFR Part 450.21 3.3.1 Erosion and Sediment Control Requirements You must design, install and maintain effective erosion and sediment controls that minimize the discharge of pollutants from construction activities. To meet this requirement, you must comply with the following requirements:

  • Area of Disturbance. You are required to minimize the amount of soil exposed during construction activities. You are also subject to the deadlines for temporarily and/or permanently stabilizing exposed portions of your site pursuant to Part 3 .3 .2 of this permit.
  • Design Requirements. You must address the following factors in designing your stormwater controls:
1. The expected amount, frequency, intensity, and duration of precipitation;
11. Stormwater volume and velocity must be controlled to minimize soil erosion and pollutant discharges; iii. The nature of stormwater runoff and run-on at the site, including factors such as expected flow from impervious surfaces, slopes, and site drainage features. You must design stormwater controls to control both peak tlowrates and total stormwater volume to minimize channel and streambank erosion and scour in the immediate vicinity of outlets; and 1v. Soil characteristics, including the range of soil particle sizes expected to be present on the site.

You must also meet the following requirements of erosion and sediment controls:

A. Direct discharges from your stormwater controls to vegetated areas. Direct discharges from your stormwater controls to vegetated areas of your site to increase sediment removal and maximize stormwater

OK.RIO Page 10 infiltration to reduce pollutant discharges, including any natural buffers established under Parts 1.2.2.E and 3.3.1.B, unless infeasible. Use velocity dissipation devices if necessary to prevent erosion when directing stormwater to vegetated areas.

B. Provide and Maintain Natural Buffers and Equivalent Erosion and Sediment Controls. When any waters of the State are located on or immediately adjacent to the site, you must maintain at least 50 feet of natural buffer zone, as measured from the top of the bank to disturbed portions of your site, from any named or unnamed receiving streams, creeks, rivers, lakes or other water bodies unless 100 feet of natural buffer is required by Part 1.2.2.E. There are exceptions from this requirement for water crossings, limited water access, and stream restoration authorized under a CW A Section 404 permit. Where no natural buffer exists due to preexisting development disturbances (e.g., structures, impervious surfaces) that occurred prior to the initiation of planning for the current development of the site, you are not required to comply with the requirements in this part, unless you will remove portions of the preexisting development (for exceptions also see Part H.3 of Addendum H).

Where some natural buffer exists but portions of the area within 50 feet of the surface water are occupied by preexisting development disturbances, you may refer to Addendum H for sediment control alternatives.

Additionally, this requirement is not intended to interfere with any other ordinance, or regulation, statute or other provision of the law.

C. Install Perimeter Controls. Install sediment controls along those perimeter areas of your site that will receive stormwater from earth-disturbing activities. Examples of perimeter controls include, but are not limited to filter berms, silt fences, fiber rolls, compost socks, silt dikes, vegetative strips and temporary diversion dikes.

For linear construction sites where perimeter controls are infeasible (e.g., due to a limited or restricted rights-of-way), you must maximize the use of other controls as necessary to minimize pollutant discharges to perimeter areas of the site and document in your SWP3 why it is impracticable in other areas of the project.

Remove sediment before it has accumulated to one-half of the above-ground height of any perimeter control.

D. Minimize Sediment Track-Out. You must minimize the sediment track-out onto streets, other paved areas, and sidewalks from vehicles exiting your construction site. To comply with this requirement, you must:

1. Restrict vehicle use to properly designated exit points 2 . Use appropriate stabilization techniques at all points that exit onto paved roads. Example of appropriate stabilization techniques include, but are not limited to, use of aggregate stone with an underlying geotextile or non-woven filter fabric, and turf mats.
3. Stabilization is not required for exit points at linear utility construction sites if other controls at the exit point are provided to minimize sediment track-out. Example of other exit controls include, but are not limited to, preventing the use of exit points during wet periods; minimizing exit point use by keeping vehicles on site to the extent possible; limiting exit size to the width needed for vehicle and equipment usage; using scarifying and compaction techniques on the soil; and avoiding establishing exit points in environmentally sensitive areas;
4. Implement additional track-out controls as necessary to ensure that sediment removal occurs prior to vehicle exit; examples of additional track-out controls include, but are not limited to, use of wheel washing, rumble strips, and rattle plates and
5. Where sediment has been tracked-out from your site onto the surface of paved street, sidewalks or other paved areas outside of your site, you must remove the deposited sediment by the end of the same work day in which the track-out occurs or by the end of the next work day if track-out occurs on a non-work day. You must remove the track-out by sweeping, shoveling, or vacuuming these surfaces, or by using other similarly effective means of sediment removal. You are prohibited from hosing or sweeping tracked-out sediment into any storm water conveyance ( unless it is connected to a sediment basin, sediment trap, or similarly effective control), storm drain inlet, or surface waters of the State.

E. Control Discharges from Stockpiled Sediment or Soil. For any stockpiles or land clearing debris composed in whole of sediment or soil, you must comply with the following requirements:

OKRl0 Page 11

1. Locate the piles outside of any natural buffers established under Parts 1.2.2.E or 3.3.1.B and physically separated from any stormwater conveyances, drain inlets, and area where stormwater flow is concentrated;
2. Install a sediment barrier along all downgradient perimeter areas. Examples of sediment barriers include, but are not limited to, berms, dikes, fiber rolls, silt fences, sandbags, and gravel bags;
3. Provide cover or appropriate temporary stabilization to avoid direct contact with precipitation or to minimize sediment discharge in accordance with Part 3.3.2 of this permit. Examples of cover include tarps, blown straw and hydro-seeding;
4. Do not hose down or sweep soil or sediment accumulated on pavement or other impervious surfaces into any storm water conveyance ( unless connected to a sediment basin, sediment trap, or similarly effective control), storm drain inlet, or surface water; and
5. Unless infeasible, contain and securely protect from wind.

F. Minimize Dust. In order to avoid pollutants from being discharged into surface waters, to the extent feasible, you must minimize the generation of dust through the appropriate application of water or other dust suppression techniques.

G. Minimize the Disturbance of Steep Slopes. You must minimize the disturbance of steep slopes (i.e., slopes of 40% or greater). If it is not feasible to avoid disturbance of steep slopes, you must:

1. Divert concentrated or channelized flows of stormwater away from and around areas of disturbance on steep slopes;
2. Use specialized erosion and sediment controls for steep slopes, such as temporary and permanent seeding with soil binders, erosion control blankets, surface roughening, reducing the continuous slope length with terracing or diversions, gradient terraces, interceptor dikes and swales, grass-lined channels, pipe slope drains, subsurface drains, level spreaders, check dams, seep berms, and triangular silt dikes; and
3. Use stabilization practices designed to be used on steep slopes. You must comply with the stabilization requirements as required in Part 3 .3 .2 of this permit.

H. Preserve Topsoil. You must preserve native topsoil on your site, unless infeasible; you must stockpile and reuse it in areas that will be stabilized with vegetation if applicable.

I. Minimize Soil Compaction. In areas of your site where final vegetative stabilization will occur or where infiltration practices will be installed, you must either:

1. Restrict vehicle and equipment use in these locations to avoid soil compaction; or
2. Prior to seeding or planting areas of exposed soil that have been compacted, use techniques that condition the soils to support vegetative growth, if necessary.

J. Protect Storm Drain Inlets. If you discharge to any storm drain inlet that carries stormwater flow from your site directly to surface water (and it is not first directed to a sediment basin, sediment trap, or similarly effective control), and you have the authority to access the storm drain inlet, you must comply with . the following requirements:

1. Install inlet protection measures that remove sediment from your discharge prior to entry into the storm drain inlet.
2. Clean, or remove and replace, the protection measures as sediment accumulates, the filter becomes clogged, and/or performance is compromised. Where there is evidence of sediment accumulation adjacent to the inlet protection measure, you must remove the deposited sediment by the end of the same work day in which it is found or by the end of the following work day if removal by the same work day is not feasible.

K. Constructed Stormwater Conveyance Channels . Design channels to avoid unstabilized areas on the site and to reduce erosion, unless infeasible, and minimize erosion of channels and their embankments, outlets, adjacent streambanks, slopes, and downstream waters during discharge conditions through the use of erosion

OKR 10 Page 12 controls and velocity dissipation devices within and along the length of any constructed stormwater conveyance channel, and at any outlet to provide a non-erosive flow velocity. Examples of velocity dissipation devices include, but are not limited to, silt dikes, check dams, gravel bags, sediment traps, riprap, and grouted riprap at outlets.

L. Installed sediment basins. If you install a sediment basin, you must comply with the following:

1. Provide storage for either the calculated volume of runoff from a 2-year, 24-hour storm, or 3,600 cubic feet per acre drained;
2. When discharging from the sediment basin and impoundment, utilize outlet structures that withdraw water from the surface of the sediment basins in order to minimize the discharge of pollutants, unless infeasible;
3. Prevent erosion of the sediment basin using stabilization controls (e.g., erosion control blankets), and the inlet/outlet using erosion controls and velocity dissipation devices;
4. Sediment basins must be situated outside of surface waters and any natural buffers established under Parts 1.2.2.E and 3.3.1.B and
5. Remove accumulated sediment to maintain at least 1/2 the design capacity and conduct all other appropriate maintenance to ensure the basin or impoundment remains in effective operating condition.

M. Dewatering Practices. You are prohibited from discharging groundwater or accumulated stormwater that is removed from excavations, trenches, foundations, vaults, or other similar points of accumulation associated with a construction activity, unless such waters are first effectively managed by appropriate controls.

Examples of appropriate controls include, but are not limited to, sediment basins or sediment traps, sediment socks, dewatering tanks, tube settlers, weir tanks, filtration systems (e.g., bag or sand filters), and passive treatment systems that are designed to remove sediment. Appropriate controls to use downstream of dewatering controls to minimize erosion include, but are not limited to, vegetated buffers, check dams, riprap, and grouted riprap at outlets. Uncontaminated clear dewatering water can be discharged without being routed to a control. You must also meet the following requirements for dewatering activities:

1. Do not discharge visible floating solids or foam;
2. Use an oil-water separator or suitable filtration device (such as a cartridge filter) that is designed to remove oil, grease, or other products if dewatering wastewater is found to contain these materials;
3. To the extent feasible, utilize vegetated, upland areas of the site to infiltrate dewatering water before discharge. In no case will surface waters be considered part of the treatment area;
4. At all points where dewatering water is discharged, comply with the velocity dissipation requirements of Part 3.3.1.K;
5. With backwash water, either haul away for disposal or return it to the beginning of the treatment process; and
6. Replace and clean the filter media used in dewatering devices when the pressure differential equals or exceeds the manufacturer's specifications.

3 .3 .2 Stabilization Requirements Implement and maintain stabilization measures to minimize erosion from exposed portions of your site in accordance with Part 3.3.2.A of this part.

A. Stabilization Deadlines

1. Initiate the installation of stabilization measures immediately in any disturbed areas where construction activities have permanently ceased on any portion of the site or will be temporarily inactive for 14 or more calendar days on any portion of the site.

The term "immediately" is used to define the deadline for initiating stabilization measures. In the context of this provision, "immediately" means as soon as practicable, but no later than the end of the

OKRl0 Page 13 next work day, following the day when the earth-disturbing activities have temporarily or permanently ceased.

2. Complete the installation of stabilization measures as soon as practicable, but no later than 14 calendar days after stabilization measures has been initiated, or 7 calendar days if you discharge to an impaired water, or ORW, or ARC (see Part 3.3 .2.A.2.c.):
a. For vegetative stabilization, all activities necessary to initially seed or plant the area to be stabilized; and/or
b. For non-vegetative stabilization, the installation or application of all such non-vegetative measures to provide effective cover.
c. If you discharge to an impaired water, or Outstanding Resource Water (ORW), or ARC, you are required to complete the stabilization activities specified in Parts 3.3.2.A.2.a and b within 7 calendar days after the temporarily or permanent cessation of earth-disturbing activities.

B. Stabilization Criteria

1. If you use vegetative cover to stabilize an exposed portion of your site for temporary and final stabilization (also see Part 8.31 Definitions of Temporary and Final Stabilization), you must comply with one of the following criteria:
a. Established uniform perennial vegetation (i.e., evenly distributed without large bare areas\ that provides 70% or more of the cover that is provided by vegetation native to local undisturbed areas.

When background vegetation covered less than 100% of the ground prior to commencing earth-disturbing activities, the 70% coverage criteria is adjusted as in following example: if vegetation covered 50% of the ground prior to construction, then the requirement would be to provide a total vegetative cover at final stabilization of70% of 50% (0.70 X 0.50 = 0.35), or 35% of the site.

b. Immediately after seeding or planting the area to be stabilized, to the extent necessary to prevent erosion on the seeded or planted area, you must select, design, and install non-vegetative stabilization measures to provide effective cover to the area while vegetation is becoming established. Examples of non-vegetative stabilization measures include, but are not limited to riprap and gravel.
2. If you are using non-vegetative controls ( e.g., hydro-mulch, erosion control blankets, riprap, geotextiles, and gabions) to stabilize exposed portions of your site, or if you are using such controls to temporarily protect areas that are being seeded and planted, you must provide effective non-vegetative cover to stabilize such exposed portions of your site.

3.3.3 Pollution Prevention Requirements You are required to design, install, implement and maintain effective pollution prevention measures in order to minimize or prevent the discharge of pollutants. To meet this requirement, you must:

  • Eliminate certain pollutant discharges from your site (see Part 3.3.3.A of this part);
  • Properly maintain all pollution prevention controls (see Part 3.3.3.B of this part); and
  • Comply with pollution prevention standards for pollutant-generating activities that occur at your site (see Part 3.3.3.B of this part).

A. Prohibited Discharges. You are prohibited from discharging the following from your construction site:

1. Wastewater from the washout of concrete, unless managed by an appropriate control as described in Part 3.3.3.B.4;
2. Wastewater from the washout and cleanout of stucco, paint, form release oils, curing compounds and other construction materials, unless managed by an appropriate control as described in Part 3.3.3.B.4; 3

Large bare area is defined as an area with 10 ft:2 or more with no perennial vegetative cover established

OKRI0 Page 14

3. Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance;
4. Soaps, detergents or solvents used in vehicle and equipment washing; and
5. Toxic or hazardous substances from a spill or other release.

B. Maintenance Requirements. You must ensure that all pollution prevention controls installed in accordance with this part remain in effective operating condition and are protected from activities that would reduce their effectiveness. You must inspect all pollutant-generating activities and pollution prevention controls in accordance with your inspection frequency requirements (see Part 4.3.13.B) and document your findings in accordance with Part 4.3.13.E. If you find that controls need to be replaced, repaired, or maintained, you must make the necessary repairs or modifications in accordance with the following:

1. General Maintenance Requirements: You must initiate work to fix the problem immediately after discovering the problem, and complete such work by the close of the next work day, if the problem does not require significant repair or replacement, or if the problem can be corrected through routine maintenance.
2. Washing of Equipment or Vehicles
a. You must provide an effective means of minimizing the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other types of washing prior to discharges. Examples of "effective means" include, but are not limited to, locating activities away from waters of the State and stormwater inlets or conveyances and directing wash waters to a sediment basin or sediment trap, using filtration devices, such as filter bags or sand filters, or using other similarly effective controls;
b. Ensure there is no discharge of soaps, detergents, or solvents in equipment and vehicle wash water.

For storage of soaps, detergents or solvents, you must provide either cover (e.g., plastic sheeting or temporary roofs) to prevent these materials from coming into contact with rainwater, or a similarly effective means designed to prevent the discharge of pollutants from these areas.

3. Storage, Handling, and Disposal of Construction Products, Materials and Wastes. You must minimize the exposure to precipitation and stormwater of any of the products, materials, or wastes specified below that are present at your site by complying with the requirements in this Part. To ensure you meet this requirement, you must:
a. For building products: In storage areas, provide either cover (e.g., plastic sheeting or temporary roofs) to prevent these products from coming into contact with rainwater, or a similarly effective means designed to prevent the discharge of pollutants from these areas.
b. For pesticides, herbicides, insecticides, fertilizers, and landscape materials:

(1) In storage areas, provide either cover (e.g., plastic sheeting or temporary roofs) to prevent these chemicals from coming into contact with rainwater, or a similarly effective means designed to prevent the discharge of pollutants from these areas; and (2) Comply with all application and disposal requirements included on the registered pesticide, herbicide, insecticide, and fertilizer label.

c. For diesel fuel, oil, hydraulic fluids, other petroleum products, and other chemicals:

(1) To comply with the prohibition in Part 3.3.3.A.3 store chemicals in water-tight containers, and provide either cover (e.g., plastic sheeting or temporary roofs) to prevent these containers from coming into contact with rainwater, or a similarly effective means designed to prevent the discharge of pollutants from these areas (e.g., spill kits), or provide secondary containment (e.g.,

spill berms, decks, spill containment pallets); and (2) Clean up spills immediately, using dry clean-up methods where possible, and dispose of used materials properly. Do not clean surfaces or spills by hosing the area down. Eliminate the source of the spill to prevent a discharge or a continuation of an ongoing discharge.

OKR10 Page 15

d. For hazardous or toxic waste (e.g., paints, caulks, sealants, fluorescent light ballasts, solvents, petroleum-based products, wood preservatives, additives, curing compounds, and acids):

( 1) Separate hazardous or toxic waste from construction and domestic waste; (2) Store waste in sealed containers, which are constructed of suitable materials to prevent leakage and corrosion, and which are labeled in accordance with applicable Resource Conservation and Recovery Act (RCRA) requirements and all other applicable federal, state, or local requirements; (3) Store all containers that will be stored outside within appropriately-sized secondary containment (e.g., spill berms, decks, spill containment pallets) to prevent spills from being discharged, or provide a similarly effective means designed to prevent the discharge of pollutants from these areas (e.g., storing chemicals in covered areas or having a spill kit available on site);

(4) Dispose of hazardous or toxic waste in accordance with the manufacturer's recommended methods of disposal and in compliance with federal, state, and local requirements; and (5) Clean up spills immediately, using dry clean-up methods where possible, and dispose of used materials properly. Do not clean surfaces or spills by hosing the area down. Eliminate the source of the spill to prevent a discharge or a furtherance of an ongoing discharge.

e. For construction and domestic waste (e.g., packaging materials, scrap construction materials ,

masonry products, timber, pipe and electrical cuttings, plastics, styrofoam, concrete, and other trash or building materials): Provide waste containers (e.g., dumpster or trash receptacle) of sufficient size and number to contain construction and domestic wastes. In addition, you must:

( 1) Keep waste container lids closed during precipitation event when not in use, when there is a significant chance of precipitation (forecasted), and/or the site is inactive or work is not in progress. Waste containers must be covered at the end of daily work shifts and when workers are not present. For waste containers that do not have lids and could leak, provide either (a) cover (e.g., a tarp, plastic sheeting, temporary roof) to minimize exposure of wastes to precipitation, or (b) a similarly effective means designed to minimize the discharge of pollutants (e.g., secondary containment);

(2) On work days, clean up and dispose of waste in designated waste containers; and (3) Clean up immediately if containers overflow.

f. For sanitary waste: Position portable toilets so that they are secure and will not be tipped or knocked over and located away from water of the State and stormwater inlets or conveyances.
4. Washing of Applicators and Containers Used for Paint, Concrete, or Other Materials. To comply with the prohibition in Parts 3 .3 .3 .A. I and 2, you must provide an effective means of eliminating the discharge of water from the washout and cleanout of stucco, paint, concrete, form release oils, curing compounds, and other construction materials. To comply with this requirement, you must:
a. Direct all wash water into a leak-proof container or leak-proof pit. The container or pit must be designed so that no overflows can occur due to inadequate sizing or precipitation;
b. Handle washout or cleanout wastes as follows:

(1) Do not dump liquid wastes in storm sewers:

(2) Dispose of liquid wastes in accordance with applicable requirements in Part 3 .3 .3 .B.3; and (3) Remove and dispose of hardened concrete waste consistent with your handling of other construction wastes in Part 3.3.3.B.3;

( 4) Clean up immediately if there is an overflow or if a discharge occurs outside of the leak-proof container or pit; and

OKRI0 Page 16

c. Locate any washout or cleanout acttv1t1es as far away as possible from surface waters and stormwater inlets or conveyances, and, to the extent practicable, designate areas to be used for these activities and conduct such activities only in these areas.

C. Emergency Spill Notification. You are prohibited from discharging toxic or hazardous substances from a spill or other release, consistent with Part 3.3.3.A.5 of this part. Where a leak, spill, or other release containing a hazardous substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Parts 110, 117, or 302 occurs during a 24-hour period, you must notify the NRC at (800) 424-8802 or, in the areas of Oklahoma, call the DEQ's Hotline at (800)522-0206 as soon as you have knowledge of the discharge. You must also, within 7 calendar days of knowledge of the release, provide a description of the release, the circumstances leading to the release, and the date of the release.

Local requirements may necessitate additional reporting of spills or discharges to local emergency response, public health, or drinking water supply agencies.

D. Fertilizer Discharge Restrictions. You are required to minimize discharges of fertilizers containing nitrogen or phosphorus. To meet this requirement, you must comply with the following requirements:

1. Apply at a rate and in amounts consistent with manufacturer's specifications, or document departures from the manufacturer' s specifications;
2. Apply at the appropriate time of year for your location, and preferably timed to coincide as closely as possible to the period of maximum vegetation uptake and growth;
3. Avoid applying before heavy rains that could cause excess nutrients to be discharged;
4. Never apply to frozen ground;
5. Never apply to stormwater conveyance channels with standing or flowing water; and
6. Follow all other federal, state, tribal and local requirements regarding fertilizer application.

3.4 Numeric Technology-Based Effluent Limitation 3.4.1. Numeric Effluent Limitation and Monitoring Requirements for Asphalt Batch Plants If you have discharges of stormwater from asphalt batch plants, you must comply with the limitations and monitoring requirements required in Addendum F of this permit. The numeri~ ~mu~nl limilaliuns in following Table 3.1 apply to stormwater discharges associated with any activities for asphalt batch plants, not for concrete batch plants.

TABLE 3.1 NUMERIC EFFLUENT LIMITATIONS FOR ASPHALT BATCH PLANTS Parameter Limitation Monitoring Frequency Sample Type Total Suspended Solids 23 mg/I, daily max. I /year Grab (TSS) 15 mg/I, 30-day avg.

Oil and Grease 15 mg/I, daily max. I/year Grab 10 mg/I, 30-day avg.

pH 6.5-9.0 s.u. I/year Grab If the project lasts less than one year, you must collect at least one sample. Also you must comply with quarterly visual monitoring and annual numeric effluent limitation monitoring and document those results as specified in your SWP3 (see Addendum F of this permit).

Monitoring for compliance with the above numeric effluent limitations must be conducted in accordance with test procedures approved in 40 CFR Part 136, and samples must be analyzed by an accredited laboratory in accordance with OAC 252:301. Where more than one test procedure is approved for the analysis of a pollutant or pollutant parameter, the test procedure must be sufficiently sensitive to meet the minimum quantification levels (MQLs) established in OAC 252:690 or, where an MQL has not been established in OAC 252:690, to quantify the amount of pollutant present at or below the level of the above numeric effluent limitations.

OKRI0 Page 17 3.5 Water Quality-Based Effluent Limitations Your stormwater discharges must be controlled as necessary to meet applicable water quality standards. Operators seeking coverage under this permit shall not cause or have the reasonable potential to cause or contribute to a violation of a water quality standard. Where a discharge is already authorized under this permit and is later determined to cause or have the reasonable potential to cause or contribute to the violation of an applicable water quality standard, DEQ will notify the operator of such violation(s). The permittee shall take all necessary actions to ensure future discharges do not cause, have the reasonable potential to cause, or contribute to the violation of a water quality standard and document these actions in the SWP3. If violations remain or re-occur, then coverage under this permit may be terminated by DEQ, and an alternative general permit or individual permit may be issued.

Compliance with this requirement does not preclude any enforcement activity as provided by the Clean Water Act (CW A) for the underlying violation. If such violation is determined, DEQ may require you to:

  • Develop a supplemental BMP action plan describing SWP3 modifications in accordance with Part 4.1.4 to address adequately the identified water quality concerns;
  • Submit valid and verifiable data and information that are representative of ambient conditions and indicate that the receiving water is attaining water quality standards; or
  • Cease discharges of pollutants from construction activity and submit an alternative general permit or individual permit application.

3 .5 .1 Discharges to Waters Identified as Impaired Waters If you discharge to impaired water that is impaired for Sediment and/or Turbidity within 1 mile, you are required to comply with the additional requirements in this part.

A. Identify whether you discharge to one or more waterbodies impaired for sediment and/or turbidity. If you discharge to impaired waters, you must indicate so in your NOI and comply with the following requirements in Parts 3 .5. l .B, C. and D of this part. If you indicate in your NOI that you do not discharge to impaired water, DEQ may determine, based on additional information, that you are considered to be discharging to an impaired water. If this is the case, you will be notified of DEQ's determination, and be provided with an opportunity to comply with additional requirements as a condition of your permit coverage, consistent with Part 3 .5 .1.

B. Site inspection requirements. You are required to comply with the following modified inspection requirements:

You must conduct site inspections once every 7 calendar days at a minimum, and within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of a storm event of 0.5 inches or greater or within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of a discharge caused by snowmelt; C. Corrective actions. If the inspection or visual examination results indicate any permit violations, you must implement the corrective actions required in Part 4.3 .14. However, a violation would result if you fail to implement the required corrective actions. If you are subject to the numeric limit in Part 3 .4 (Table 3 .1 for asphalt batch plant) you must implement the monitoring requirement according to Addendum F of this permit. If your sample results indicate that you have exceeded the numeric limit, you must implement the corrective actions according to Part 4.3.14.

D. Stabilization requirements. You are required to comply with the following modified stabilization requirements:

You are required to comply with the stabilization requirements as specified in Parts 3 .3 .2.A. l and 2 within 7 calendar days after the temporary or permanent cessation of earth-disturbing activities.

3.5.2 Discharges to waters identified as an ORW or ARC If you discharge to waters identified as ORW (see Addendum E of this permit) or your sites are located within areas identified as an ARC and you are relying on option b in Part 1.2.2.E.2 (see Part 10 and Addendum A of this permit), you must implement inspections, corrective actions and stabilization requirements provided in Part 3.5.1 above. Also you must comply with the following additional requirements:

OKRI0 Page 18 A. In order to minimize sediment discharges, if any OR W or ARC is located on or immediately adjacent to your site, you must ensure that a vegetated buffer zone of at least 100 feet is retained or successfully established/planted between the area disturbed and all perennial or intermittent streams. A vegetated buffer zone of at least 50 feet must be retained or successfully established/planted between the areas disturbed during construction and all ephemeral streams or drainages. If the nature of the construction activity or the construction site makes a buffer impossible, you must provide equivalent controls. See Addendum H of this permit for information to assist you in developing equivalent controls.

B. For drainage locations serving 5 or more acres disturbed at one time, a temporary (or permanent) sediment basin and/or sediment traps shall be used to minimize sediment discharges within the areas of the OR W or ARC. You may use the information in Parts 3.3.1.L and 4.3.1 l.A.4 to assist you in complying with this requirement.

For common drainage locations that serve an area with 5 or more acres disturbed at one time, a temporary (or permanent) sediment basin(s) that provides overall storage for a calculated volume of runoff from a 2-year, 24-hour storm from each disturbed acre drained, or equivalent control measures, shall be provided where attainable until final stabilization of the site. Where no such calculation has been performed, a temporary (or permanent) sediment basin(s) providing overall storage of 3,600 cubic feet of storage per acre drained, or equivalent control measures, shall be provided where attainable until final stabilization of the site. When computing the number of acres draining into a common location, it is not necessary to include flows from off-site areas and flows from onsite areas that are either undisturbed or have undergone final stabilization where such flows are diverted around both the disturbed area and the sediment basin(s).

In determining whether installing a sediment basin(s) is attainable, you may consider factors such as site soils, slope, available area on site, etc. In any event, you must consider public safety, especially as it relates to children, as a design factor for the sediment basin(s) and alternative sediment controls shall be used where site limitations would preclude a safe design. For drainage locations that serve 5 or more disturbed acres at one time and where a temporary sediment basin(s) or equivalent controls are not attainable, smaller sediment basins and/or sediment traps should be used. Where neither the sediment basin(s) nor equivalent controls are attainable due to site limitations, silt fences, vegetative buffer strips, or equivalent sediment controls are required for all down-slope boundaries of the construction area and for those side slope boundaries deemed appropriate as dictated by individual site conditions. DEQ encourages the use of a combination of sediment and erosion control measures in order to achieve maximum pollutant removal.

C. For any portion of the site that discharges to an ORW or ARC, instead of the inspection frequency specified in Part 4.3 .13 .B, you must conduct inspections within 7 calendar days and within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the occurrence of a storm event of 0.5 inches or greater.

D. For initiating and completing stabilization, you are required to complete the stabilization activities within 7 calendar days after the temporary or permanent cessation of earth-disturbing activities.

3.6 Responsibilities of Operators Permittees may meet one or both of the operational control components iri the definition of "operator" found in Part 8.23 of this permit. Either Parts 3 .6.1 or 2 or both will apply depending on the type of operational controls exerted by an individual permittee.

3.6.1 Operational Control over Construction Plans and Specifications If you have operational control over construction plans and specifications, including the ability to make modifications to those plans and specifications (e.g., developer, owner, or operator), you must ensure that:

A. The project specifications meet the minimum requirements of Part 4 and all other applicable permit conditions of this permit; B. The SWP3 indicates the areas of the project where you have operational control over project specifications (including the ability to make modifications in specifications), and ensure all other permittees implementing portions of the S WP3 who may be impacted by any changes to the plan are notified of such modifications in a timely manner; and

OKRIO Page 19 C. The SWP3 for portions of the project where you are the operator indicates the name and DEQ permit number for parties with day-to-day operational control of those activities necessary to ensure compliance with the SWP3 or other permit conditions. If these parties have not been identified at the time the SWP3 is initially developed, the permittee with operational control over project specifications shall be considered to be the responsible party until such time as the authority is transferred to another party (e.g., general contractor) and the plan updated.

3.6.2 Operational Control over Day-to-Day Activities If you have operational control over day-to-day activities, you must ensure that:

A. The SWP3 for portions of the project where you are the operator meets the minimum requirements of Part 4 of this permit and identifies the parties responsible for implementation of control measures; B. The SWP3 indicates areas of the project where you have operational control over day-to-day activities; and.

C. The SWP3 for portions of the project where you are the operator indicates the names and their permit numbers of the parties with operational control over project specifications (including the ability to make modifications in specifications).

3 .6.3 Responsibilities of Operators at a Larger Common Plan of Development The criteria within the definition of "Operator" allow for more than one entity to be active at a construction site that is considered a larger common plan of development. For example, the developer and one or more builders may be engaged in construction activity within a residential subdivision at the same time, and any or all may be considered operators as defined by this permit. Where it is determined to be more efficient or desirable, this permit allows for all construction activities at a larger common plan of development to be covered by a single permit and the SWP3 held by a "Primary Operator", usually the developer.

For the purposes of this provision, "Primary Operator" for a construction project that has more than one operator means an operator who has chosen to obtain coverage under this permit for all discharges from all earth-disturbing activities at a construction site that is considered to be a larger common plan of development even if such discharges originate from portions of the site operated by another entity, such as a builder or utility contractor.

For the purposes of this provision, "Secondary Operator" for a construction project that has more than one operator means an operator who has elected to have the discharges from earth-disturbing activities on a portion of a larger common plan of development to which he/she has operational control covered by the permit and SWP3 held by the Primary Operator rather than obtaining separate permit coverage for those discharges. If an operator who may be considered a Secondary Operator under this provision elects not to have their discharges from earth-disturbing activities covered by the Primary Operator's permit, this operator must obtain separate permit coverage.

A. Responsibilities of the Primary Operator. The Primary Operator is ultimately responsible for the runoff from the perimeter of the development. Regardless of the reason for the runoff, the Primary Operator is responsible for ensuring sufficient overall controls for the development. The Primary Operator is responsible for obtaining permit coverage for the development and for developing and maintaining an SWP3 for the development. The Primary Operator shall identify all Secondary Operators in the SWP3 and identify the specific areas of the development where they will be active. The Primary Operator shall ensure that Secondary Operators are aware of all SWP3 requirements, BMPs and other control measures that apply to their operations. Contractor Certifications (Part 4.4 of this permit) or similar written instruments should be used to document this notification. The Primary Operator shall not terminate permit coverage until at least one of the following conditions has been met:

1. All construction, including landscaping and lot development, has been completed, and final stabilization has been achieved.
2. All lots are sold and developed, and there are no temporary common controls for subdivision outfalls, i.e. sediment basins, large sediment traps, check dams, etc.
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