Exhibit F. C-SWPPP rev.pdf

Comprehensive Stormwater Pollution Prevention Plan (C-SWPPP) For

Construction Activities:

Project/Site Name:

Maryville Ph 2 Water Distribution

Improvements

Project Address/Location:

Oak St., Elizabeth St., & Morrison St.

Georgetown, SC 29440

Primary Permittee:

City of Georgetown

Permittee/Owner Contact:

Orlando Arteaga

2377 Maybank Drive

Georgetown, SC 29440 oarteaga@georgetownsc.gov

SWPPP Preparer:

Rowe Professional Services Company

Ryan E. Harvey, PE

6009 N Kings Hwy., Myrtle Beach, SC 29577

(843) 444-1020 rharvey@rowepsc.com

Day-to-Day Operator:

Insert Company or Organization Name

Insert Name

Insert Address

Insert City, State, Zip Code

Insert Telephone Number

Insert Fax/Email

(Leave Blank if not known.)

C-SWPPP Preparation Date:

5/8/25

Modification Dates:

Modification I:

Modification II:

Table of Contents

Section 1 PROJECT OVERVIEW

1.1 Narrative

1.2 Stormwater Management and Sediment Control

1.3 Sequence of Construction

1.4 Non-Numeric Effluent Limits

1.5 Buffer Zone Management

1.6 Certification Statement

Section 2 SITE FEATURES AND SENSITIVE AREAS

2.1 Sources of Pollution

2.2 Surface Waters

2.3 Impairments And TMDLs

2.4 Critical Areas (Coastal Zone Only)

Section 3 COMPLIANCE REQUIREMENTS

3.1 SWPPP Availability

3.2 Pre-Construction Conferences

3.3 Inspection Requirements

3.4 Maintenance Requirements

3.5 Record Keeping

3.6 Final Stabilization

Appendices REFERENCE MATERIAL

Appendix A - Site Maps Appendix B - Drainage Maps

Appendix C - Additional Approvals/Certifications Appendix D - NA

Appendix E - Inspection Log and Reports (OS-SWPPP** Only) Appendix F - Rainfall Records (OS-SWPPP** Only)

Appendix G - Additional Site Logs and Records (OS-SWPPP** Only)

Appendix H - Construction General Permit (CGP) - SCR100000 Appendix I - Notice of Intent

Appendix J - NPDES Coverage Approval Letter Appendix K - NA

Appendix L - Contractor Certifications

*C-SWPPP is acronym for Comprehensive Storm Water Pollution Prevention Plan **OS-SWPPP is acronym for On-Site Storm Water Pollution Prevention Plan

1.1 Narrative (CGP Section 3.2.1)

Construction Activities and BMP Summary

This project consists of upgrading 2” water main to 6” water main. Some of the work will be done along the existing edge of asphalt while others will require open cut of the existing roadway for the main and new services. The existing drainage system is a mix of open roadside swales and piped in areas. The open pipe ends and catch basins will be protected with sediment and erosion control measures. All disturbed areas will be stabilized.

Flooding Issues

There are no existing or known potential flooding problems within our site.

1.2 Stormwater Management and Sediment Control (CGP Section 3.2.2)

Erosion prevention BMPs shall be placed throughout the construction site to aid in the prevention of sediment-laden stormwater runoff. These BMPs shall be focused in areas with high potential of erosion, areas preceding infiltration practices, and shall be applied to all steep slopes. That is slopes equal to or greater than 3H:1V.

Each erosion prevention measure shall be selected on a site-specific basis and details have been provided on the construction site plans. The plans identify all proposed Erosion Prevention BMPs and the recommended installation, maintenance, and inspection procedures.

Examples of Erosion Prevention BMPs are, but are not limited to temporary seeding. Information on the design and proper use of Erosion Prevention BMPs can be located in the SC DHEC’s BMP

Handbook.

Sediment Control BMPs

Sediment Control BMPs are designed to remove some of the sediment accumulated within stormwater runoff, to the best extent practicable. These BMPs help prevent sediment impacts to adjacent properties and water bodies from stormwater discharges originating from construction sites.

Typically these BMPs are placed near each of the site’s outfalls and are installed prior to clearing and grubbing of the site (before large areas of soil are exposed). However, these BMPs can also be located throughout the construction site and, in these circumstances, are installed after mass grading has occurred. Placement, sizing and modifications of Sediment Control BMPs should be left to the SWPPP preparer and/or the Site Engineer. Contractors must consult the SWPPP Preparer as listed at the front of this SWPPP before making any significant changes to these BMPs.

Each sediment control BMP shall be selected on a site-specific basis. Examples of Sediment Control BMPs are, but are not limited to sediment traps, sediment basins, silt fence, rock check dams, rock sediment dikes, sediment tubes, and inlet protection. Please consult SC DHEC’s BMP Handbook for more information on Sediment Control BMPs.

Structural Control BMPs and Floodplain Placement

This site-specific SWPPP utilizes the following structural control BMPs: retention pond; detention pond; Bioretention areas; permanent vegetated swales; and storm sewer systems. These practices have been designed to either divert flows from exposed soils, to retain/detain flows, and to otherwise limit the runoff and the discharge of pollutants from disturbed areas of the construction site.

Throughout the lifespan of the construction project these BMPs will be installed and maintained, as required by the SWPPP and the construction site plans, until final stabilization has been achieved for the areas draining to each BMP. Upon final stabilization, each structural control BMP must be modified to the post-construction conditions shown within the approved construction site plans or removed, if the structural BMP was a temporary structure.

Construction Entrances and Dust Control

All access areas into and out of the limits of disturbance, as shown on the construction site plans, are required to be equipped with a construction entrance. The use of this BMP will limit the amount of sediment being transported by construction vehicles onto existing roadways or other impervious areas. Any tracked sediment, along with any attached pollutants, deposited on impervious areas could be washed downstream during the next rain event. Each construction entrance must be installed as shown in the details section of the construction site plans.

If a new entrance or exit is required, that is not shown on the plans, install the construction entrance as noted by the construction entrance detail, mark the location on the plans and make a record of this minor modification in the SWPPP’s modification log, which is located within one of the Appendices of the On-site SWPPP.

Each stabilized construction entrance should be used in conjunction with Street Sweeping measures if it becomes apparent that sediment is still being tracked onto adjacent impervious areas, even with the use of the construction entrance.

During extremely dry conditions, drought, and/or excessive winds, the construction site should be treated for dust control to prevent the suspension of fine sediment particles into the air, being carried offsite, and deposited on adjacent properties or surface waters. This practice may not be directly called out for on the construction site plans. A water tanker used to spray the soil down may be an effective way to prevent excessive dust at a construction site.

Water Quality BMPs During Construction

Site-specific water quality BMPs (e.g., sediment basins, sediment traps, rock check dams, and rock sediment dikes) must be installed prior to the mass clearing, grubbing and grading of the site, and must be kept in functioning order throughout the lifespan of all construction activities. Each of these

BMPs must be maintained and inspected until all areas draining to these BMPs have reached final stabilization, approved by the construction site inspector or the SWPPP Preparer, and recorded within the stabilization log located as an Appendix of the On-site SWPPP.

The location, installation procedures, and maintenance procedures for each water quality BMP can be found within the approved construction site plans.

Post-Construction Water Quality

All construction sites disturbing 5 acres or more, including construction activities associated with Larger Common Plans disturbing 5 acres or more (for sites located within an MS4 this may be 1 acre or more), must be designed to treat water quality post-construction. These water quality controls must be installed and stabilized prior to terminating coverage under the CGP. These controls will require routine maintenance to remain functional; this is to be conducted by the Primary Permittee or the entity that accepts responsibility for these structures once construction has been completed.

Additional information, including permanent maintenance and inspection procedures, can be found in Appendix C of the On-site SWPPP or within the construction site plans.

Upon final stabilization, each construction site will have to make the transition from temporary

BMPs to permanent BMPs. This transition may include the conversion of a sediment basin to a detention basin, a sediment trap to a bioretention area, or diversion swales to permanently vegetated swales. All post-construction (permanent) water quality and water quantity BMPs are identified in the final phase of the Erosion and Sediment Control located within the construction site plans.

Other Stormwater Management Procedures

Based on the nature, conditions, and/or procedures associated with this construction site, the following items must be followed and adopted by all those conducting land disturbing activities at this site:

• All construction debris must be stockpiled in designated areas, which have been provided with the proper BMPs to prevent the discharge of pollutants through stormwater runoff from buildings or other similar materials off-site or into surface waters.

• Any additional waste material or stockpile material (i.e., soil and mulch) must also be stored in the designated areas as shown on the Construction Site Plans or as the contractor, responsible for day-day activities at this site, deems appropriate. Silt fence or an approved equal shall surround all stockpiled materials.

• All parties conducting work at this construction site must be informed of and make note of pollutant sources, both industrial and construction, at this site, and be informed of all controls and measures the will be implemented to prevent the discharge of these pollutants in stormwater runoff.

• Any additional non-stormwater discharges, as referenced in the CGP, should be eliminated or reduced to the maximum extent feasible. All unpreventable non-stormwater discharges shall be treated through the approved stormwater management system before release off-site. Following is a list of allowable non-stormwater discharges:

Fire hydrant flushing

Wash water without detergents

Water used for dust control

Potable water

Building wash down water without detergents

Uncontaminated pavement wash water

Uncontaminated condensation from mechanical equipment

Uncontaminated ground or spring water

Water from foundation of footing drains

Uncontaminated excavation dewatering

Landscape irrigation.

1.3 Sequence of Construction

NA

For additional information or questions on the sequencing please contact the SWPPP Preparer or the

Permittee referenced on the cover of this SWPPP.

1.4 Non-Numeric Effluent Limits

Stormwater Volume and Velocity Control

During the implementation of construction activities, all parties performing work at this construction site whose work may affect the implementation of the SWPPP must be informed of and directed on how to comply with this Non-Numeric Effluent Limit, which requires the management of stormwater runoff within the construction site and at each outfall. The purpose of this requirement is to control the stormwater volume and velocity at these locations to minimize erosion.

Specifically, each responsible party should be made aware of the practices that have been or should be implemented at the construction site to accomplish these particular stormwater management practices. Below is a list of practices that may be utilized within the disturbed area and at each outfall at construction sites to control stormwater volume and velocity:

Volume Control

• Limiting the amount of disturbed area and exposed soils;

• Staging and/or Phasing of the Construction Sequence;

• Sediment Basins and Sediment Traps;

• Diverting off-site flow around the construction site;

• Controlling the Drainage Patterns within the Construction Site; and,

• Temporary Stabilization of Disturbed Areas.

Velocity Control

• Surface Roughening and/or other Slope Stabilization Practices;

• Level Spreaders, Riprap Plunge Pools and/or other Velocity Dissipation BMPS located at the

Construction Site's and Sediment Basin Outfalls;

• Use of Rock Checks, Sediment Tubes, Etc. in Temporary Diversions Swales and Ditches; and,

• Use of Erosion Control Blankets, Turf Reinforcement Mats, and other Non-Vegetative BMPs that can be used to Quickly Stabilize Disturbed Areas.

The SWPPP Preparer/Engineer should approve any modifications (additional BMPs or changes to existing BMPs) to address the management of stormwater volume and velocity prior to implementation. All approved SWPPPs that were issued coverage under the CGP should include ample BMPs and other control measures to address this specific Non-Numeric Effluent Limit.

Soil Exposure, Compaction and Preservation

Throughout construction activities, the amount of soil exposed during construction should be kept to a minimum. This may be accomplished by minimizing the amount of the disturbed area within the permitted Limits of Disturbance (shown on the approved construction site plans) to only that which is necessary to complete the proposed work. For areas that have already been disturbed and where construction activities will not begin for a period of 14 days or more, temporary stabilization techniques must be implemented.

Prior to implementation of any major grading activities, topsoil is to be preserved by placing it in areas designated for stockpiling until final grades are reached. Each stockpile must be equipped with proper sediment and erosion controls to preserve the topsoil and protect adjacent areas from impacts.

Once final grades have been reached, the preserved topsoil should be utilized to apply to areas identified for stabilization. Topsoil contains nutrients and organisms that aid in the growth of vegetation.

The Compaction of Soil should also be minimized to the degree practicable during grading activities. This is especially important during the replacement of topsoil to aid in a quick establishment of vegetative cover. Compaction of soil may also reduce rainfall's ability to infiltrate into the soil, increasing the amount of stormwater runoff.

Soil Stabilization

Throughout construction activities, soil stabilization techniques are to be initiated as soon as practicable whenever any clearing, grading, excavating, or other land-disturbing activities have permanently or temporarily ceased on any portion of the construction site and will not resume for a period exceeding 14 calendar days. For areas where initiating stabilization measures is infeasible, (e.g., where snow cover, frozen ground, or drought conditions preclude stabilization), initiate vegetative or non-vegetative stabilization measures as soon as practicable.

Steep Slopes (Slopes of 30% grade or greater)

All disturbed steep slopes (30% grade, ~3H:1V, or greater), and steep slopes to be created through grading activities must be managed in a fashion that limits the potential of erosion along the slopes.

All parties whose work is/was responsible for the creation/disturbance of steep slopes must comply with the following items:

• Minimize the Disturbance of all steep slopes, when possible.

• Divert Concentrated or Channelized Flows of stormwater away from and around steep slope disturbances.

• Use Specialized BMP Controls including temporary and permanent seeding with soil binders;

erosion control blankets; surface roughening; reducing 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 to minimize erosion.

• Initiate Stabilization Measures as soon as practicable on any disturbed steep slope areas where construction activities have permanently or temporarily ceased, and will not resume for a period exceeding 7 calendar days.

• A Vegetative and/or Non-Vegetative Cover must be established within 3 working days from the time that stabilization measures were initiated.

Stabilization of steep slopes should be a priority for those performing work at the construction site.

At the very least, runoff control BMPs should be implemented to transport stormwater runoff from the top of the slope to the toe of the slope. An example of this is to install diversion swales along the top of slope and direct the runoff towards pipe slopes drains to transports the runoff to the toe of the slope. All pipe slope drain outlets are to be equipped proper outlet protection.

Sediment Discharge Minimization

Permittees, Contractors, and all other parties responsible for conducting land-disturbing activities are required to install and maintain all erosion and sediment BMPs that are identified on the approved construction site plans. These BMPs have been designed and approved to address such factors as the amount, frequency, intensity and duration of precipitation; the nature of resulting stormwater runoff;

and soil characteristics, including the range of soils particle sizes expected to be present on the construction site. Proper installation, inspection, and maintenance will allow these BMPs to operate at maximum efficiencies in order to minimize sediment discharges to the maximum extent practical.

Pollutant Discharge Minimization

Permittees, Contractors, and all other parties responsible for conducting land-disturbing activities are required to install, implement, and maintain effective pollution prevention measures to minimize the discharge of pollutants. At a minimum, the following items must be implemented:

• Minimize the discharge of pollutants from dewatering trenches and excavations by managing runoff with the appropriate controls. Otherwise these discharges are prohibited;

• Minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. Wash waters must be treated in a sediment basin or alternative control that provides equivalent or better treatment prior to discharge;

• Minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, sanitary waste and other materials present on the site to precipitation and to stormwater; and,

• Minimize the discharge of pollutants from spills and leaks and implement chemical spill and leak prevention and response procedures.

Prohibited Discharges

Permittees, Contractors, and all other responsible parties for conducting land-disturbing activities are prohibited to discharges, from the construction site, the following items:

• Wastewater from washout of concrete, unless managed by an appropriate control;

• Wastewater from washout and cleanout of stucco, paint, form release oils, curing compounds and other construction materials;

• Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; and,

• Soaps or solvents used in vehicle and equipment washing.

1.5 Buffer Zone Management

N/A

2.1 Sources of Pollution

Throughout construction activities, each Permittee, Contractor, and person responsible for conducting work will need to ensure that sources of pollution are managed to prevent their discharge from the construction site. Expected pollution sources during construction have been identified in Table 2.1-A, but due to the nature of construction activities, it is often tough to predict all pollution sources that may appear throughout the life of a construction project. For that reason, the following table has also been provided to help all those performing work at this construction site to identify possible sources of pollution

Stormwater runoff subjected to the identified pollution sources must be treated by the appropriate BMPs as directed by this SWPPP.

In the event that any additional sources of pollution are identified during construction, the person(s) with day-to-day operational control at the site is to add the new source(s) to Table 2.1-A and consult with the SWPPP Preparer to properly address this source and to prevent the discharge of its pollutant through stormwater runoff.

Table 2.1-A: Potential Sources of Pollution Source Material or Chemical Location* Appropriate Control Measures

Loose soil exposed/disturbed during clearing, grubbing and grading activities

Sediment All areas within the Limits of

Disturbance

As directed by the construction Plans.

This includes Silt Fence, sediment tubes, sediment basins, and sediment traps.

Areas where construction equipment are cleaned, a.k.a.

concrete washout

Heavy Metals & pH

Located adjacent to each construction entrance

Concrete Washout Basin as shown on the plans.

Water encountered during trenching

Nutrients & Sediment

In and around any trenching activities.

Direct water into impoundments such as basins or traps to allow for the sedimentation of the listed pollutants.

Paving Operations Sediment & Trash

All areas to be paved.

Inlet protection.

Material Delivery and Storage Areas

Nutrients, pH, Sediment, Heavy Metals, oils & grease

All areas used as storage areas Silt fence and/or sediment dikes

Equipment fueling and maintenance areas

Metals, hydrocarbons, oils and greases

Areas surrounding fuel tanks

Provide secondary containments, locate in upland areas. Repair leaking and broken hoses.

Paints

Metal oxides, stoddard solvent, talc, calcium-carbonate, arsenic

Throughout site, primarily in areas of building construction

Washwater should be contained and is prohibited from being discharged

*Area where material/chemical is used on site.

2.2 Surface Waters

2.3 Impairments and TMDLs

2.4 Critical Areas (CZC only)

3.1 SWPPP Availability

The OS-SWPPP will be retained onsite.

3.2 Pre-Construction Conferences

A preconstruction meeting will be held at the City of Georgetown Water Utilities Offices prior to the start of construction. Sign in sheets will be provided and ROWE Professional Services Company will relay the requirements of the approved OS-SWPPP to the Contractor and Owner as part of the agenda.

3.3 Inspection Requirements

The site inspections will be performed weekly by either the SWPPP preparer or a qualified person knowledgeable in the principals and practice of erosion and sediment controls.

3.4 Maintenance Requirements

All BMP’s identified on the OS-SWPPP shall be maintained in effective operating condition. If deficiencies are noted in the weekly inspections they shall be corrected within 7 days if practicable or before the next rain event. If BMP’s need to be modified or additional BMP’s are necessary they shall be implemented prior to the next storm event if practicable.

3.5 Record Keeping

The following will be located as indicated in the on-site SWPPP.

• See plans – Appendix A

• See plans – Appendix B

• CZC Permit – Appendix C

• NA– Appendix D

• Inspection Log – Appendix E

• Rain Log – Appendix F

• Precon Minutes and Attendance Log, Contactor Log, SWPPP Modification Log – Appendix G

• SC Dual Construction General Permit – Appendix H

• Notice of Intent – Appendix I

• NPDES Coverage Approval Letter – Appendix J

• NA – Appendix K

• Contractor Certifications – Appendix L

3.6 Final Stabilization

Once the water main is constructed the disturbed area shall be stabilized. Upon completion of all stabilization a notice of termination will be submitted for the project.

Appendix A Site Maps

See plan set

Appendix B Drainage Maps

See plan set

Appendix C Additional Approvals/Certifications

Coastal Zone Consistency Certification

Appendix D Engineering Reports

Page | 20

Appendix E Inspection Logs and Reports

Page | 45

Appendix F Rainfall Log and Reports

Page | 49

SWPPP Rainfall Records (January - June) Year:

January Rainfall February Rainfall March Rainfall April Rainfall May Rainfall June Rainfall

1 1 1 1 1 1

2 2 2 2 2 2

3 3 3 3 3 3

4 4 4 4 4 4

5 5 5 5 5 5

6 6 6 6 6 6

7 7 7 7 7 7

8 8 8 8 8 8

9 9 9 9 9 9

10 10 10 10 10 10

11 11 11 11 11 11

12 12 12 12 12 12

13 13 13 13 13 13

14 14 14 14 14 14

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25 25 25 25 25 25

26 26 26 26 26 26

27 27 27 27 27 27

28 28 28 28 28 28

29 29 29 29 29 29

30 30 30 30 30

31 31 31

Page | 50

SWPPP Rainfall Records (July - December) Year:

July Rainfall August Rainfall September Rainfall October Rainfall November Rainfall December Rainfall

1 1 1 1 1 1

2 2 2 2 2 2

3 3 3 3 3 3

4 4 4 4 4 4

5 5 5 5 5 5

6 6 6 6 6 6

7 7 7 7 7 7

8 8 8 8 8 8

9 9 9 9 9 9

10 10 10 10 10 10

11 11 11 11 11 11

12 12 12 12 12 12

13 13 13 13 13 13

14 14 14 14 14 14

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25 25 25 25 25 25

26 26 26 26 26 26

27 27 27 27 27 27

28 28 28 28 28 28

29 29 29 29 29 29

30 30 30 30 30 30

31 31 31 31

Page | 51

PPP Rainfall Records (January - June) Year:

January Rainfall February Rainfall March Rainfall April Rainfall May Rainfall June Rainfall

1 1 1 1 1 1

2 2 2 2 2 2

3 3 3 3 3 3

4 4 4 4 4 4

5 5 5 5 5 5

6 6 6 6 6 6

7 7 7 7 7 7

8 8 8 8 8 8

9 9 9 9 9 9

10 10 10 10 10 10

11 11 11 11 11 11

12 12 12 12 12 12

13 13 13 13 13 13

14 14 14 14 14 14

15 15 15 15 15 15

16 16 16 16 16 16

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25 25 25 25 25 25

26 26 26 26 26 26

27 27 27 27 27 27

28 28 28 28 28 28

29 29 29 29 29 29

30 30 30 30 30

31 31 31

Page | 52

SWPPP Rainfall Records (July - December) Year:

July Rainfall August Rainfall September Rainfall October Rainfall November Rainfall December Rainfall

1 1 1 1 1 1

2 2 2 2 2 2

3 3 3 3 3 3

4 4 4 4 4 4

5 5 5 5 5 5

6 6 6 6 6 6

7 7 7 7 7 7

8 8 8 8 8 8

9 9 9 9 9 9

10 10 10 10 10 10

11 11 11 11 11 11

12 12 12 12 12 12

13 13 13 13 13 13

14 14 14 14 14 14

15 15 15 15 15 15

16 16 16 16 16 16

17 17 17 17 17 17

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20 20 20 20 20 20

21 21 21 21 21 21

22 22 22 22 22 22

23 23 23 23 23 23

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29 29 29 29 29 29

30 30 30 30 30 30

31 31 31 31

Appendix G Additional Site Logs and Records

Page | 53

SWPPP Pre-Construction Conference Attendance Log Date & Time Description/Outline and Name of the Presenter of SWPPP and Site Requirements

Name Company Signature

Page | 54

SWPPP Pre-Construction Conference Attendance Log (Continued) Name Company Signature

Page | 55

SWPPP Contractor & Sub-Contractor Log Name of Construction Site Location of Construction Site

Company/Individual Name Work Responsibilities

1.)

Start Date:

Completion Date:

2.)

3.)

4.)

5.)

6.)

7.)

8.)

9.)

10.)

Page | 56

SWPPP Contractor & Sub-Contractor Log (Continued)

11.)

12.)

13.)

14.)

15.)

16.)

17.)

18.)

19.)

20.)

21.)

SWPPP Modification Log

Page | 57

Type of Modification Description of Modification Location of Modification

Major Minor

Reason for Modifications:

Approved/Implemented By:

SWPPP Modification Log (Continued)

Page | 58

SWPPP Modification Log (Continued)

Page | 59

Type of Stabilization Description of Stabilization Location of Stabilization

Final Temporary

Initiate Date:

Additional work proposed for this area:

Inspection Frequency for Stabilized Area:

Additional

Additional

Additional

Additional

Appendix H Construction General Permit SCR100000

Page | 60

Appendix I Notice of Intent

Page | 61

Appendix J NPDES Coverage Approval Letter

Page | 66

Appendix K Approval Letter

Page | 67

Appendix L Contractor Certifications

Page | 68

To be Included at preconstruction meeting