2024_Design_Manual_w-Appendices.pdf

DESIGN MANUAL

Sewer Policies, Procedures, Standards and Specifications for Development

GREENWOOD METROPOLITAN DISTRICT

Greenwood, South Carolina

Effective January 24, 2024

TABLE OF CONTENTS

SECTION 1 - INTRODUCTION

SECTION 2 - SEWER MAIN EXTENSION POLICIES

SECTION 3 - SERVICE CONNECTIONS AND SERVICE LINES

SECTION 4 - GREASE CONTROL

SECTION 5 - DRAWING AND SURVEY REQUIREMENTS

SECTION 6 – RIGHT OF WAY REQUIREMENTS

SECTION 7 - GRAVITY SEWER DESIGN STANDARDS

SECTION 8 - PUMP STATION AND FORCE MAIN DESIGN STANDARDS

Appendix A Standard Specifications

• Gravity Sewer

• Pump Stations and Force Mains

Appendix B Standard Details

• Gravity Sewer

• Pump Stations and Force Mains

• Grease Traps

Appendix C Forms

• Example Sewer Development Agreement

• Sewer Air Test Report

• Manhole Vacuum Test

• Example Quit Claim Deed

• Example Sewer Easement

Revised January 24, 2024 Page 1 of 46 Section 1 Introduction

SECTION 1 - INTRODUCTION

1.1 Overview

1. The purpose of this Design Manual is to set forth, in a single source, the policies, design standards, specifications and standard details that apply to sewer facilities to be incorporated into the Greenwood Metropolitan District’s (GMD) sewer system. The GMD Design Manual serves as a resource for developers and engineers in designing new sewer systems that will be owned and operated by GMD or private systems that will connect to the existing GMD system.

2. The most recent copy may be downloaded in PDF format from GMD’s website, www.greenwoodmetro.com .

3. All engineers, contractors, plumbers, developers, and users proposing to design or install facilities that will be incorporated into GMD’s sewer system or connected to GMD’s sewer system must comply with all requirements herein.

4. The Design Manual will be reviewed as needed and may be updated without notice. Updates may be made by staff as minor changes or additions are made to the material covered. Major revisions affecting policy will be reviewed and approved by the Commission.

5. The GMD Design Manual has been approved and accepted by the Commission and first became effective on February 1, 2004. The current revision date is located on the cover page and footers.

1.2 GMD History and Purpose

1. The Greenwood Metropolitan District (GMD) is a Special Purpose District formed in 1959 to transport and treat wastewater in the Greenwood Metropolitan area. GMD’s charter included owning and operating wastewater treatment plants, pump stations and trunk sewers (larger sewers). The City of Greenwood Commissioners of Public Works (CPW) owned and operated collection sewers (smaller sewers) that conveyed wastewater to GMD’s trunk sewer system. As Greenwood grew, several sub-divisions were formed into taxing sub-districts. These sub-divisions installed collection systems and taxed themselves to pay for the capital expenditures as well as operation and maintenance activities of their collection sewers.

2. In 1991, a task force comprised of many local leaders was formed by the Chamber of Commerce.

The focus of this task force was to identify the most pressing need in the utility field in Greenwood.

The recommendation from the task force was that Greenwood needed a unified sewer system as opposed to a series of sub-districts with varying degrees of maintenance. Emergency calls were a problem because a sub-district Committee member (Commissioner) had to be notified in order to handle emergency situations.

3. In 1995-96, EPA began developing a Sanitary Sewer Overflow (SSO) Policy. This Policy was to provide clear regulations that prohibit overflows or spills from wastewater systems. GMD’s existing National Pollutant Discharge Elimination System (NPDES) Permit required that wastewater be conveyed to the treatment plant without spills, but the formalization of the SSO Policy renewed the emphasis on collection system operation and maintenance.

4. In 1995-96, GMD conducted flow monitoring on its trunk system and contributing sub- district tie-ins to determine where spills may be occurring and to locate sources of extraneous water. Such extraneous water includes rain water that enters the sanitary sewer system during rainfall events (rain water is not supposed to enter into the sanitary sewer system). This rain water is commonly identified as inflow and infiltration (I/I).

http://www.greenwoodmetro.com/

Revised January 24, 2024 Page 2 of 46 Section 1 Introduction

5. The flow monitoring data indicated that the sub-districts had excessive amounts of I/I flow that contributed to SSO’s and hydraulic overloading of the wastewater treatment plant (WWTP) during periods of heavy rainfall and high groundwater conditions. It became apparent that these sub-districts had neither the expertise nor the financial resources to correct the magnitude of I/I problems within their collection sewers. Again, this reopened the consideration of GMD assuming ownership of sub-district lines and providing management, operation and maintenance services on their collection sewers.

6. On June 24, 1999, GMD invited all the Committee members (Commissioners) of the sub-districts to a public meeting. The purpose of the meeting was to communicate the SSO Policy requirements, as GMD understood them. At that meeting, GMD was presented with a Petition signed by 24 sub-districts demanding that GMD assume ownership of their collection systems.

This Petition prompted negotiations with the Greenwood Commissioners of Public Works (CPW) to maintain CPW’s collection sewers. Beginning January 1, 2000, GMD agreed to own, operate and maintain all the sewer systems that contribute flow to the two GMD-owned wastewater treatment plants except for the Greenwood CPW which GMD agreed to operate and maintain their collection systems under a fifty (50) year lease agreement. On March 2004, the Greenwood CPW signed an agreement with the Commissioners of GMD to assume ownership of the CPW sewer system.

1.3 GMD Information (as of date of revision)

GMD web site: www.greenwoodmetro.com

Main Office: Greenwood Metropolitan District Emmett F. Brooks Technical Services Facility 110 Metro Drive Greenwood, SC 29646

Phone: 864-943-8000

Fax: 864-942-3919

Service Area: 100 Square Miles

Customers: 14,400 Residential Connections 1,800 Commercial / Industrial Connections 15 Permitted Industrial Users

Treatment Plants: Wilson Creek WWTP - 12,000,000 Gallons Per Day (12 MGD) West Alexander WWTP - 2,200,000 Gallons Per Day (2.2 MGD)

Sewer Collection System:

32 Wastewater Lift Stations 40 miles of Trunk Line Sewers 800 miles of Collection Line Sewers 580 alternative collection system (low pressure sewer)

Revised January 24, 2024 Page 3 of 46 Section 1 Introduction

1.4 GMD Sewer Use Regulation

1. GMD’s sewer use regulations are presented in a document titled Rules and Regulations Governing Sewer Use, Industrial Pretreatment Requirements and Enforcement Responses. This document authorizes this Design Manual and is available via GMD’s web site www.greenwoodmetro.com .

1.5 Definitions

(for clarification to any term or reference included in this Design Manual, contact GMD at 864- 943-8000)

1. Alternative Collection System: a system designed to collect wastewater from individual sources utilizing solids interceptor tank effluent systems (gravity or pressure), and/or grinder pump systems. An exception is where a system such as a grinder pumping system, which serves one building or residence, meets the definition of a service connection (e.g., force main connecting to a gravity sewer).

2. Auxiliary Power: provisions to provide backup electrical and/or mechanical power.

3. Building Sewer: a sewer conveying wastewater from the premises of a user directly or indirectly to GMD's facilities.

4. Bypass: The intentional diversion of wastewater streams from any portion of an industrial user's treatment facility.

5. Collection System: a pipeline system designed to receive wastewater or treated effluent directly from individual sources.

6. Commission: the Greenwood Metropolitan Commission, which is the governing body of the Greenwood Metropolitan District.

7. Construction Permit: a State permit authorizing construction of wastewater facilities including, but not limited to, wastewater treatment systems, interceptors, and collection systems.

8. Delegated Review Program (DRP): a DHEC program by which the technical review for the construction of sewer systems is delegated to local entities, such as GMD.

9. Developer: a property owner or other interested party who intends to make improvements to a property for the purpose of subdividing, resale or lease to another party.

10. Double residential service connection: a service connection owned, operated, and maintained by GMD that connects two private service lines to the sewer main.

11. Engineer: Engineer as referenced herein may mean GMD, an Engineer retained directly by GMD to design sewer facilities, or an Engineer retained by a Developer or Contractor to design sewer facilities.

12. Force Main: a pipeline carrying wastewater or treated effluent in which the flow in the pipeline is dependent on and driven by a pump station.

13. GPD: gallons per day

14. GPM: gallons per minute

15. Gravity Sewer: means a pipeline carrying wastewater or treated effluent which flows exclusively under the influence of gravity (i.e., no pump station).

Revised January 24, 2024 Page 4 of 46 Section 1 Introduction

16. Interceptor Tanks: tanks and other devices designed to remove solids from raw wastewater prior to discharging to an alternative collection system.

17. NPDES Permit: a permit issued by DHEC to a discharger pursuant to regulations adopted by the Department’s Board for all point source discharges into surface waters

18. Owner: the legal property owner or other party requesting and/or taking responsibility for sewer service connection(s). Also see Developer.

19. Permitted Flow: the value equivalent to the sum of flows as computed for the purpose of issuing construction permits for sewer lines or other connections to the systems.

20. Private Entity: any private corporation, association, partnership, corporation, industry, co-partnership, firm, trust, estate, any other legal entity whatsoever, or an agent or employee thereof.

21. Public Entity: means organizations such as a city, town, county, municipality, state or special purpose sewer district (ie: GMD).

22. POTW: means a publicly owned treatment works

23. Public Right of Way: a Right of Way owned by a public entity, such as GMD, SCDOT, Greenwood County or the City of Greenwood.

24. Pump and Haul: an operation whereby process wastewater or domestic wastewater is collected and stored in DHEC approved facilities and then hauled by tanker truck or other vehicle to an off-site receiving facility such as a POTW. Pump and haul in this context does not apply to management of spills.

25. Right of Way: a parcel of land owned or given by easement for the purpose of constructing and maintaining a linear feature such as a road, driveway, waterway or utility line.

26. Service Connection: an individual gravity sewer line, or an individual pump station and force main, including the tee, wye or saddle fitting on the sewer main or alternative collection system. Piping associated with an individual service connection shall not require a construction permit if all of the following conditions are met:

a. individual connections, at the time of connection, have design flow contribution no greater than five (5) percent of the existing wastewater treatment facility’s design capacity or have no generated flows greater than fifty thousand (50,000) gallons per day;

b. individual connections are to a gravity sewer main;

c. individual connections only serving a single house, single mobile home, single building, or multiple-building complex under single ownership with no rental units (e.g., schools or industry);

d. individual connections are not serving a shopping mall, multiple-building complex where there will be several owners or renters (e.g., apartment complex, condominium complex, mobile home park, campground, industrial park, or business park), or marina; and

e. individual connections that do not have the reasonable ability to serve any additional projects and/or buildings in the future that are not part of a multiple-building complex under single ownership with no rental units (e.g., schools or industry)

Revised January 24, 2024 Page 5 of 46 Section 1 Introduction

27. Service Line: the portion of a service connection consisting of underground pipe and fittings that are not part of the sewer main and are not part of the building plumbing. Also referred to as “service lateral”.

28. Sewer Main: the sanitary sewer collection system (typically 8” pipe or larger) beginning at the point where two (2) or more individual service lines connect together, except as otherwise defined as a double residential service connection. Also referred to as “sewer lines” or “collection lines”

29. Trunk Sewer: a pipeline system designed to transport wastewater from the collection system (sewer mains) to the treatment plant. Trunk sewers usually do not have individual service connections and are usually larger than 8” in diameter. Also referred to as “trunk lines” or “interceptors”.

30. Wastewater Treatment Facility (WWTF): means a system of structures, equipment and related appurtenances designed to treat, store, or manage wastewater.

1.6 Abbreviations:

AASHTO American Association of State Highway and Transportation Officials AC Acre(s) ACI American Concrete Institute ANSI American National Standards Institute ASTM American Society for Testing Materials AWWA American Water Works Association CCTV Closed Circuit Television Inspection CF Cubic Feet CFM Cubic Feet per Minute CFS Cubic Feet per Second CI Cast Iron CIP Cast Iron Pipe CIPP Cured-in-Place Pipe Lining CMP Corrugated Metal Pipe CONC Concrete CPW Greenwood Commissioners of Public Works CU. FT Cubic Foot, Cubic Feet CU. YD Cubic Yard CY Cubic Yard DFT Dry Film Thickness DHEC Department of Health and Environmental Control DI Ductile Iron DIA Diameter DIP Ductile Iron Pipe EJIW East Jordan Iron Works EL Elevation ELEV Elevation EW Each Way EXIST Existing FLG Flange, Flanged FT Foot, Feet GALV Galvanize, Galvanized

Revised January 24, 2024 Page 6 of 46 Section 1 Introduction

GIS Geographic Information System GMD Greenwood Metropolitan District HOA Hand-Off-Auto HDPE High Density Polyethylene ID Inside Diameter IN Inch, Inches ISO International Organization for Standardization LB Pound LF Linear Foot, Linear Feet LG Long MAX Maximum MH Manhole MIN Minimum MJ Mechanical Joint NASSCO National Association of Sewer Service Companies NEMA National Electrical Manufacturers Association NOM Nominal NO. Number Nos. Numbers NPDES National Pollutant Discharge Elimination System OC On Center OD Outside Diameter OPNG Opening OSHA Occupational Safety and Health Administration (or Act) PACP Pipeline Assessment and Certification Program PE Plain End PSF Pounds per Square Foot PSI Pounds per Square Inch PVC Polyvinyl Chloride Pipe R Radius RCP Reinforced Concrete Pipe REQ’D Required RPR Resident Project Representative ROW Right of Way, Rights of Way SCDHEC South Carolina Department of Health and Environmental Control SCDOT South Carolina Department of Transportation SCH Schedule SDR Standard Dimension Ratio SF Square Foot, Square Feet SQ Square SQ FT Square Feet, Square Foot SS Sanitary Sewer or Stainless Steel STD Standard STL Steel SY Square Yard TBM Temporary Bench Mark TYP Typical UL Underwriters Laboratories

Revised January 24, 2024 Page 7 of 46 Section 1 Introduction

VCP Vitrified Clay Pipe W/ With WWF Welded Wire Fabric

Revised January 24, 2024 Page 8 of 46 Section 1 Introduction

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Revised January 24, 2024 Page 9 of 46 Section 2 Sewer Main Extension Policy

SECTION 2 - SEWER MAIN EXTENSION POLICIES

2.1 Overview

1. The Greenwood Metropolitan District (GMD) owns and operates a sewer collection system as described in Section 1.

a. GMD does not construct new sewer mains, but will own, operate, and maintain new sewer collection systems constructed by the property owner (Developer) that are designed and installed in accordance with this Design Manual, GMD Rules and Regulations, state regulations and federal regulations.

b. The proposed sewer collection system must be located within the existing boundaries of the GMD service area or must be annexed into GMD’s sewer service area.

2. Private sewer collection systems that are owned, operated, and maintained by the property owner may be constructed within GMD service area if serving a single property owner.

a. GMD’s design standards must be followed regardless of ownership, to ensure that the system does not allow inflow and infiltration to enter the GMD system through substandard construction.

b. Facilities such as apartments, schools or industry may wish to construct private sewer mains in order to reduce the number of connections to the GMD sewer system.

c. GMD will not accept ownership of sewer mains that can only serve one user.

d. GMD will not accept ownership of service lines located between the edge of the public right of way and the building served.

3. The Developer, at their own expense, shall retain a professional engineer (Engineer), licensed to practice in the State of South Carolina, to design and permit the proposed sewer collection system and make periodic observations of construction.

a. The Engineer who makes periodic observations of construction must certify that construction is complete and in accordance with the approved plans and specifications.

b. The Engineer must also provide an accurate record drawing set to GMD. It is the Engineer’s responsibility to ensure that accurate record drawings are provided to both GMD and permit agencies using as-built survey, construction red-line drawings and periodic observations of the work.

4. The Developer, at their own expense, shall retain a Contractor, licensed in the State of South Carolina with a Water and Sewer Lines (WL) classification to construct the sewer collection system, in accordance with the approved plans and specifications, this Design Manual and all applicable local, state and federal regulations.

a. GMD reserves the right to not accept new construction if the requirements listed herein are not met.

5. The Developer, at their own expense, shall retain a registered land surveyor, licensed in the State of South Carolina, to provide an as-built survey and plat of the sewer collection system for use in conveying the system to GMD and in preparation of record drawings by the Engineer.

a. The plat must show the sewer collection system as constructed, including all easements and rights of way, in adequate detail for conveyance of the complete system to GMD.

Revised January 24, 2024 Page 10 of 46 Section 2 Sewer Main Extension Policy

b. The as-built plat must be approved by GMD and recorded for public use by the developer, unless otherwise approved by GMD.

6. The Developer must convey the completed system to GMD via a final quit claim deed, including all easements and rights of way.

a. Off-site sewer mains constructed on property not owned by the Developer must include a separate recorded easement executed by the property owner and a recorded plat of the easement.

b. GMD will not own, operate, or maintain private service lines as defined in this Design Manual and determined at the sole discretion of GMD. Service lines must be specifically exempted from any document transferring ownership of the system to GMD.

2.2 Project Planning, Sewer Availability Letter and Impact Fee Estimate

1. Prior to design and permitting of the project, the Developer or Engineer should request a sewer availability letter by informing GMD of the proposed project, its location and sewer capacity requirements.

a. GMD’s New Account Worksheet, a letter or email may be used for this correspondence. GMD will then prepare a sewer availability letter and impact fee estimate for the Developer.

b. GMD recognizes the need for discretion when requesting preliminary information and the Developer does not need to be identified at this time. However, the Developer must be identified and must acknowledge receipt of GMD’s fee estimate prior to GMD’s review of the DHEC construction permit application.

c. Preliminary plans may be submitted to GMD for early review and comment, and engineers are encouraged to do so. GMD is under no obligation to provide final comments and reserves the right to make additional comments at any time.

d. If GMD has the capacity to serve the project, GMD will respond to the Developer or Engineer with both a sewer availability letter and an estimate of impact fees for the project.

2. Beginning on July 1,2024, impact fees must be paid before GMD will agree to accept flow from a project. Once impact fees are paid, the purchased capacity is dedicated to the indicated parcel of land and no refunds will be given.

a. Incomplete projects with unpaid capacity fees as of July 1, 2024, may pay the outstanding balance or relinquish the allocated capacity by notifying GMD and cancelling any open state construction permits.

3. GMD allocates available capacity based upon payment of impact fees. GMD is required to upgrade system capacity based upon allocated flow, not actual flow. GMD must realize billable flow revenue from capacity upgrades to cost effectively operate constructed facilities.

a. Allocated capacity that does not generate billable flow may be revoked by GMD without notice, at the sole discretion of GMD.

4. A parcel of land with allocated capacity may be sold with the previously purchased capacity intact, provided the original use of the capacity does not change.

a. If a parcel is subdivided, part of the original capacity will be allocated to each new parcel according to the anticipated use of that parcel. For example, a parcel with 30,000 gallons per

Revised January 24, 2024 Page 11 of 46 Section 2 Sewer Main Extension Policy day (gpd) of allocated capacity can be subdivided into 100 parcels with 300 gpd allocated capacity each.

b. When subdividing property, the Developer is responsible for communicating the allocated capacity of each parcel to the buyer. GMD will use the original design calculations unless alternative calculations are approved by GMD.

5. GMD reserves the right to charge additional impact fees at any time when sewer flow exceeds the allocated capacity or when the use type changes.

2.3 GMD Approval and Construction Permitting Requirements

1. All proposed sewer collection systems and line extensions constructed within GMD’s service area, whether to be owned by GMD or a private entity, must be approved by GMD and permitted for construction through the State of South Carolina.

a. No sewer collection system, public or private, shall be constructed within GMD’s boundaries without GMD approval.

b. The proposed sewer collection system must be designed and permitted in accordance with this Design Manual and SC Regulation 61-67 – Standards for Wastewater Facility Construction.

2. The Developer, Engineer and Contractor must comply with all GMD requirements and each are encouraged to read and understand the requirements of the following technical sections of this Design Manual :

a. Section 3 - Service Connections and Service Lines

b. Section 4 - Grease Control

c. Section 5 - Drawing and Survey Requirements

d. Section 6 - Right of Way Requirements

e. Section 7 - Gravity Sewer Design Standards

f. Section 8 - Pump Station and Force Main Design Standards

g. Appendix A - Standard Specifications

h. Appendix B - Standard Details

3. Other approvals and permits are required for lawful completion of a project in accordance with local, state, and federal regulations. It is the responsibility of the Developer and the Engineer to determine and comply with all approval and permitting requirements.

4. After the sewer availability letter and impact fee estimate are sent to the Developer or Engineer, the Engineer may submit to GMD an application package for a permit to construct. The most recent state permit application form must be completed, currently DHEC 1970 (09/2016).

a. Submit the application via email to sewerproject@greenwoodmetro.com unless otherwise approved by GMD.

i. A download site will be needed in order to transfer files larger than 10MB.

b. GMD is a Delegated Review Program (DRP). Submit all applications as DRP applications, unless otherwise approved by GMD.

mailto:sewerproject@greenwoodmetro.com

Revised January 24, 2024 Page 12 of 46 Section 2 Sewer Main Extension Policy

i. The DRP does not include alternative sewer systems (e.g., low pressure sewers, STEP/Grinder systems, small diameter sewer systems, vacuum sewers), unless the project is an extension of an alternative sewer system that has already received approval from

DHEC.

ii. Projects involving wastewater treatment facilities (new, modification or expansions), or effluent outfall construction (gravity, force mains or pump stations) from wastewater treatment facilities, are also excluded from the DRP program.

c. Submit the application as Wastewater Facilities only. Do not include water system information on the application form.

d. Clearly identify the project location using a valid 911 address or road intersection.

e. Provide a project description that clearly indicates the length, size and material of sewer pipe, number of manholes, number of service connections and number of connections to the existing sewer system.

f. Show the Developer’s company name and contact information of the Developer as the initial owner of the system.

g. Show GMD as both the final owner of the system and the entity responsible for O&M unless the proposed system is intended to be private.

h. Show the Engineering Firm’s name and contact information.

i. Indicate that you will use the latest approved version of GMD Standard Specifications for Sewer (Appendix A), available for download from www.greenwoodmetro.com . The approval date is on the cover page.

j. Indicate the average design flow that must be allocated to the project. Project flow must match the sewer availability letter and impact fee estimate on file with GMD for the project.

k. Indicate GMD’s publicly owned treatment works (POTW) that will treat flow from the project by name and NPDES number. Refer to the original sewer availability letter.

l. Clearly identify the name and registration number of the Engineer(s) signing the signature page.

m. Clearly identify the name and title of the person signing for the Developer. Do not repeat the company name on the signature line.

5. The Developer or Engineer must pay the review fee directly to DHEC. DHEC will typically email an invoice directly to the Developer and Engineer listed on the application once GMD has uploaded the application package.

6. GMD will review and approve construction plans and flow calculations before agreeing to accept flow from any project.

a. GMD impact fees must be paid before GMD will issue a willingness and ability to serve letter for the purpose of obtaining a state construction permit.

b. GMD impact fees must be paid before GMD submits the final, approved plans to DHEC for the purpose of obtaining a state construction permit.

Revised January 24, 2024 Page 13 of 46 Section 2 Sewer Main Extension Policy

2.4 Agreements

1. The Developer shall sign any required Agreements with GMD prior to beginning construction.

a. A blank Sewer Development Agreement is provided for reference in Appendix C.

2. The Developer must execute all other necessary agreements to ensure that the requirements of this manual are met. Necessary agreements may include, but are not limited to:

a. Off-site easement agreements

b. Engineering agreements

c. Construction contracts

3. GMD may require proof of agreements at the sole discretion of GMD.

2.5 Construction of the Project

1. The Construction Phase of the project will begin once the Permit to Construct from DHEC is issued.

2. All construction related activity related to sewer main installation shall be coordinated with GMD.

a. The Contractor shall schedule a pre-construction meeting with GMD at least 2 weeks prior to beginning construction. Work that is completed without GMD inspection will not be accepted by GMD.

b. Material submittals (data sheets, catalog cut sheets, required certifications, etc.) must be received and approved by GMD prior to beginning construction.

3. Utility construction shall not commence until all final grading for the development project is complete, or within 6-inches of final grade.

a. No overland grading shall be performed in areas where utilities are already installed.

4. All construction shall be in accordance with the approved and permitted Plans and this Design Manual.

5. Contractors installing the sewer collection system shall be licensed in the State of South Carolina as a General Contractor, Water and Sewer Lines (WL) classification, Group Dollar Limitation must be more than the contracted amount for the system installation.

2.6 Project Closeout

1. The following items must be submitted to GMD in order to request approval to operate the completed system.

a. Record Drawings

b. Sewer line air test results

c. Manhole vacuum test results

d. Mandrel tests and/or CCTV inspections

e. Contractor affidavit

f. Contractor warranty

g. Engineer’s certification letter

Revised January 24, 2024 Page 14 of 46 Section 2 Sewer Main Extension Policy

h. Quit Claim Deed

i. Easements

j. As-built survey / final plat

2. Approval to operate the constructed sewer system must be obtained from both GMD and DHEC prior to allowing any flow into the system or making connection to any residence, business or other source of sewer.

a. GMD will write a final letter of acceptance agreeing to own, operate and maintain the completed project once all of the above items are satisfactorily completed. This letter must be submitted to DHEC as part of the request to operate submittal.

b. DHEC will issue an approval to operate in the name of the Developer (initial owner on DHEC form).

3. Record Drawings must be provided to GMD when approval to operate is requested.

a. Prepare record drawings based on as-built survey information and contractor red lines.

b. Provide an updated structure table showing the final coordinates and elevations of manholes and other sewer structures.

c. Show the final location of sewer system features such as manholes, cleanouts, bends, tees, reducers, air release valves etc. in both plan and profile views.

d. Include locations of roads, sidewalks, driveways, stormwater infrastructure, water distribution infrastructure, etc.

e. Submit Record Drawings in both PDF and AutoCAD format.

4. Test results must be provided to GMD when approval to operate is requested. Forms are provided in Appendix C.

a. Provide satisfactory air test results for each sewer line constructed.

b. Provide satisfactory vacuum test results for each manhole constructed.

5. Contractor affidavit and contractor warranty must be provided in writing to GMD when approval to operate is requested.

a. Provide an affidavit stating that that there are no liens or legal actions what would affect the deeding of sewer utilities to GMD and include overall cost of the sewer system for use by GMD in its asset inventory.

b. Provide a one year warranty to GMD on contractor’s letterhead or a form prepared by the Engineer.

i. State that all work described or shown in the construction documents was performed and guaranteed for a period of twelve months from the date of the Permit to Operate date.

ii. Any maintenance required during this guarantee period will be at the expense of the Contractor.

6. The Engineer certifying construction must submit a certification letter to GMD when approval to operate is requested. The letter must:

Revised January 24, 2024 Page 15 of 46 Section 2 Sewer Main Extension Policy

a. Certify construction is complete in accordance with the approved plans and specifications to the best of the engineer’s knowledge, information and belief.

b. State that certification is based upon periodic observations of construction and a final inspection of the project.

7. The Developer must provide a quit claim deed to transfer ownership of the completed sewer system to GMD.

a. The quit claim deed must transfer ownership of the entire sewer system to GMD, including on site easements to GMD, except for private service lines and any sewer mains that are to remain private.

b. Private service lines must be specifically excluded from transfer in each quit claim deed.

c. The quit claim deed must be accompanied by a recorded as-bult plat, showing the constructed sewer system.

8. The Developer must provide an as-built plat, prepared by a licensed surveyor, and recorded in Greenwood County. The as-built plat must:

a. Clearly indicate all sewer rights of way, including sewer located under pavement, within the road right of way (shoulder) and sewer located on private parcels.

b. Call out each right of way width on the plat and clearly indicate if it is a public (road) Right of Way or a dedicated sewer right of way.

c. Comply with Right of Way Requirements of this Design Manual.

d. Comply with Greenwood County’s requirements for a recordable plat.

9. For sewer lines located in road right of way, the Developer must provide temporary easement(s) allowing access to the sewer infrastructure until roads and public easements are conveyed to the City or County.

10. For sewer lines not located in the public Right of Way, the Developer must provide permanent easements for GMD facilities.

a. Deeded, recorded and exclusive easements shall be provided for all new sewer systems that are installed outside of a public Right of Way.

b. The easements shall be fully accessible for GMD to operate and maintain the sewer system.

c. Dedicated, deeded, and recorded access points to the easements shall be provided as required and/or approved by GMD.

d. The Developer must provide GMD a copy of all recorded legal documents related to and confirming the easements.

Revised January 24, 2024 Page 16 of 46 Section 2 Sewer Main Extension Policy

Revised January 24, 2024 Page 17 of 46 Section 3 Service Connections & Service Lines

SECTION 3 - SERVICE CONNECTIONS AND SERVICE LINES

1. Permission (a Permit) is required for all connections to GMD’s sewer system. The Permit may take any form approved by GMD. Permits may be in the form of letters, customer service forms, memos, etc., at the sole discretion of GMD.

2. Service connections and service lines shall be installed at the property owner’s (Owner) expense, where required to provide service to individual lots, residences, buildings, or businesses.

a. On new sewer mains, service connections shall be tee-wyes installed as the new sewer is laid to serve all proposed parcels along the sewer route.

b. Service connections not used immediately shall be capped in a manner approved by GMD.

c. It shall be the contractor’s or plumber’s responsibility to locate existing service connections on sewer mains.

d. For connecting new services to existing main sewers, approved strap-on saddles shall be used.

GMD will allow point repairs to the existing sewer main when the existing sewer is not suitable for a saddle.

e. For trunk sewers or where otherwise required by GMD, new service lines shall be connected to manholes instead of tee-wyes or saddles.

3. The Greenwood Commission of Public Works (CPW) provides billing for GMD. Service connection permits authorizing connection to GMD’s manholes and sewers may be obtained by paying the appropriate fees to CPW’s customer service department prior to any construction.

a. GMD must approve the location of new service connections prior to construction.

b. All fees must be paid to GMD or CPW prior to construction of the connection.

c. GMD will not own, operate, or maintain service lines from the building to the public right of way, but all private service lines shall be installed in accordance with this Design Manual.

d. The portion of the service connection within the public right of way may be maintained by GMD, at its sole discretion.

e. All new Service Connections shall be installed at the expense of the property Owner.

f. GMD must approve any construction drawings prior to construction.

g. All service lines that are installed must be inspected by both GMD and the Greenwood County / City code enforcement department.

h. All work must be performed by a licensed contractor or plumber, except that residents may perform their own work as long as it is in compliance with this Design Manual and local building codes.

i. A 1-year warranty (minimum) shall be provided to GMD by the contractor, plumber or property owner installing the new service line connection.

i. The responsible party shall repair all defects identified during the 1-year warranty period including surface restoration issues and problems with the sewer or service line installation.

4. Service lines shall be 4 inches or 6 inches in diameter.

Revised January 24, 2024 Page 18 of 46 Section 3 Service Connections & Service Lines

5. Refer to standard details and specifications in this Design Manual for service connection requirements.

6. If new service connections replace existing septic tanks, the septic tanks shall be abandoned in accordance with DHEC recommendations.

7. Existing service connections shall be abandoned as required by GMD when no longer in use.

a. GMD must witness/inspect the abandoned service connection before the work is backfilled.

8. Prior to constructing a new service connection, the Owner has obtained any necessary easements in favor of owner and GMD, their heirs, successors and assigns, properly executed and recorded, and has furnished a plat prepared by a registered surveyor showing layout, pipe size, easement locations, and property lines.

9. GMD is given the irrevocable consent to attach or permit to be attached other service lines and/or systems to the proposed connection and/or system with such payment by other property owners being served by such attachment to the owner herein, as shall be determined to be a fair and equitable charge by GMD alone, when, in judgment of GMD, such action is in the best interests of the overall system and service of GMD.

10. The Owner shall not permit anyone not authorized by GMD to tap onto, or place sewage or other matter in lines of the Owner.

11. In the case that the lowest floor level is less than 6" above the top of the upstream manhole, the property owner must install and maintain a backflow prevention device in their service line.

12. All joints of the building sewer shall be tight and waterproof. GMD shall establish an infiltration/inflow rate for each plant and sewer system, using methods deemed necessary by

GMD

Revised January 24, 2024 Page 19 of 46 Section 5 Drawings & Survey Requirements

SECTION 4 - GREASE CONTROL

4.1 Introduction

1. It is the intent of these requirements to provide for specific standards for grease trap locations, designs, installations, constructions and maintenance so as to comply with the requirements of the Greenwood Metropolitan District’s (GMD) Rules and Regulations.

2. The requirements have been developed in accordance with Sewer Use and Industrial Pretreatment Requirements as a comprehensive and effective means of regulating the collection and transportation of fats, oils and grease (FOG) of mineral or vegetable origin. The intent is to provide a policy for the GMD staff, supplementary to the Regulations, regarding the appropriate means of collection, transportation, and disposal of FOG; and to provide information to persons who are subject to the policy.

3. GMD desires to protect the public health, safety, and welfare of the citizens in the service area and to eliminate the impact of grease discharges on the wastewater collection and treatment facilities. The purpose of this document is to provide for the regulation of the collection and transportation of non-hazardous fats, oils, and grease of mineral or vegetable origin retained in commercial grease interceptors. The policy also contains guidelines on the sizing and maintenance of grease interceptors, permitting, inspections, monitoring, reporting and record keeping.

4.2 Applicability

1. This policy is applicable to all sewer users that have the potential to discharge Fats, Oils and Grease in excess of the amount allowed in the Rules & Regulations, including but not limited to Food Service Establishments. Such users, as determined at the sole discretion of GMD, shall provide approved grease interceptors as required by GMD’s Rules and Regulations.

2. All Food Service Establishments which are proposed, constructed, expanded, renovated, reconstructed, or change ownership shall meet the requirements included herein prior to opening, expanding, or reopening their Food Service Establishment. All existing Food Service Establishments that are not in full compliance with GMD requirements shall complete installation of a grease interceptor by the compliance date determined by GMD.

3. Accelerated compliance shall be required for users which are found discharging grease in sufficient quantities to cause blockages or necessitate additional maintenance on the wastewater collection system to prevent blockages. Each Food Service Establishment will be notified in writing of any compliance date determined by GMD.

4. Any request for extensions must be made in writing to GMD at least thirty (30) days in advance of the compliance date. The request must include the reasons for inability to comply, additional time required for compliance, and steps to be taken to avoid further delays.

5. On a case-by-case basis, a request in writing for a waiver of GMD’s requirements to install a grease interceptor may be made by a Food Service Establishment under the following conditions:

a. The Food Service Establishment shall submit and obtain GMD’s approval of a Best Management Plan for the control and disposal of grease.

Revised January 24, 2024 Page 20 of 46 Section 5 Drawings & Survey Requirements

b. The Food Service Establishment shall implement a recycling program to avoid discharges of grease to the public sewer.

c. The Food Service Establishment must not have a record of having an adverse impact on the public sewer within twelve (12) months of seeking the waiver. Any waiver granted will be considered void should a Food Service Establishment cause adverse impact on the public sewer due to grease. Additionally, the Pretreatment Engineer reserves the right to rescind any waiver and require the installation of a grease interceptor as needed and in accordance with this regulation.

4.3 FOG Program Definitions

1. Bakery: shall mean a facility which produces baked goods for retail, wholesale or resale. Included in the term bakery shall be such enterprises as donut and pastry shops.

2. Chemical Additive: shall mean liquids, gas, or solids composed of non-living substances introduced into the grease interceptor for the purpose of changing the chemical nature or physical properties of the fats, oils, and grease retained in the interceptor.

3. Common Grease Interceptor: shall mean an interceptor to which wastewater containing fats, oils and grease is directed from more than one food related facility having different operators or types of operations, such as a food court.

4. Disposal: shall mean the discharge, deposit, injection, dumping, spilling, leaking, or placing of any solid or semi-solid grease interceptor waste into or on any land or water so that such waste or any constituent thereof may enter the environment, including emissions to air or discharge to surface or ground water.

5. Disposer: shall mean a person who operates a facility at which grease waste is intentionally placed for final disposition.

6. Food Courts: shall mean areas predominantly found in shopping centers or amusement parks and festivals where several food preparation establishments having different owners may share seating space or plumbing facilities.

7. Food Service Establishment: shall mean any commercial facility discharging kitchen or food preparation wastewaters including but not limited to restaurants, motels, hotels, cafeterias, grocery stores, hospitals, nursing homes, schools, bars, and any other facility which, in GMD’s opinion, would require a grease trap or grease interceptor installation by virtue of its operation.

8. Garbage Grinder: shall mean a device which shreds or grinds up solid or semi-solid garbage into smaller portions for discharge into the sanitary sewer.

9. Generator: shall mean any Food Service Establishment which produces grease waste.

10. Grease Interceptor: shall mean a flow control structure installed on the sewer service line of a building constructed as to separate and hold fats, oils and grease from wastewater in order to reduce the fats, oils and grease entering the sanitary sewer. Grease interceptors are often called “grease traps”. However under-the-sink grease traps shall not be construed as meeting this definition. Grease interceptors are typically 1,000 gallons or larger.

11. Grease Trap: shall mean a device primarily used by Food Service Establishments for removal of food solids from a waste stream and placed in the building plumbing system immediately following a sink or washbasin. Grease traps are generally smaller than 100 gallons in capacity.

Revised January 24, 2024 Page 21 of 46 Section 5 Drawings & Survey Requirements

12. Grease Waste: shall mean any liquid, semi-liquid, or solid fats, oil and grease that are removed from commercial operations through the use of a grease trap or interceptor.

13. Grease Waste Handling: shall mean the collection, transportation, storage, transfer, processing disposal or other handling of grease waste. This term shall not apply to the generator of grease waste or to the storage of grease waste in a grease interceptor.

14. Hauled Waste: shall mean transported Holding Tank Waste including waste from vessels, chemical toilets, campers, trailers, septic tanks, and vacuum pump tank trucks.

15. Hauled Waste Disposal Form: shall mean a multi-part reporting form used to document the point of generation, transportation, and disposal of grease waste as may be specified by DHEC or GMD.

16. Hauler: shall mean transporter.

17. Hazardous Material: shall mean a substance or combination of substances which, because of its quantity, concentration, or characteristics, may (1) due to human exposure, cause or significantly contribute to mortality, illness , or incapacitation; (2) pose a substantial hazard to human health or the environment if improperly handled; or (3) be defined to be a hazardous waste under the Resource Conservation and Recovery Act, under regulations promulgated pursuant to said Act, or under any other Local, State or Federal Law.

18. Transporter: shall mean a person who owns or operates a vehicle for the purpose of transporting liquid waste.

4.4 General Requirements

1. The following administrative, operational, and other general requirements are applicable to all food service establishments, new or existing. Particular requirements for grease trap or grease interceptor construction specifically pertaining to both new and existing food service establishments shall be as specifies further herein and in Standard Detail No. GT-1.

a. All food service establishments shall have grease-handling facilities approved by GMD.

Establishments whose grease-handling facilities are not in accordance with this standard shall be given a compliance schedule with a deadline not to exceed one hundred eighty (180) days from the initial notification date.

b. All grease traps or grease interceptors shall be designed and installed in accordance with this standard to provide sufficient access for inspection and maintenance.

c. Plumbing plans must be submitted to GMD for approval before construction begins. Service will not be provided to the facility until the grease trap or grease interceptor has passed inspection by GMD.

2. Flow control fittings should be installed on the inlet side of the grease trap or grease interceptor to protect against overloading or sudden surges.

3. Hydraulic loading and retention time shall be used to determine interceptor size per the following formulas.

a. Minimum size grease interceptor shall be 1,000 gallons

b. Restaurants

(S) X (GS) X (HR/2) X (LF) = Grease interceptor capacity in gallons, where:

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S = Number of seats in dining area GS = Gallons of wastewater per seat (use 5 gallons per seat) HR = Numbers of hours open per day LF = 1.0 Recreational area

1.0 Main Highways

0.5 Other highways

c. Hospitals, Nursing Homes, Other type commercial kitchens with varied seating capacity:

(M) X (GM) X (2.5) X (LF) = Grease interceptor capacity, in gallons, where:

M = Meals per day GM = Gallons of wastewater per meal (use 5 gallons per meal) LF = Loading factor

1.0 Dishes used

0.5 Paper products

4. Interceptors shall be polyethylene or as approved by GMD. Compartments shall be as illustrated in GMD standard details, unless otherwise approved in writing. They shall be installed level, close to the source and in an area where they are easily accessible. Refer to the Standard Detail No GT- 1 (Appendix B). No steel tanks will be accepted.

5. Under certain circumstances GMD may approve internal, “under-the-counter” grease traps made from corrosion resistant materials. Refer to the Table I for capacity requirements of “under-the-counter” models. Acceptance of “under-the-counter” type grease traps will only be approved by GMD in specific cases as defined further herein.

Table I - Recommended Ratings for Commercial “Under-The-Counter” Packages Unit Grease Traps

Type of Fixture Flow Rate (gpm)

Grease Retention Capacity Rating (pounds)

Recommended Max. Capacity per Fixture Connected to Tap (gallons)

Restaurant Kitchen Sink 15 30 50.0 Single Compartment Scullery Sink 20 40 50.0 Double-Compartment Scullery Sink 25 50 62.5 Two Single-Compartment Sink 25 50 62.5 Two Double-Compartment Sink 35 70 87.5

Dishwashers for Restaurants

Up to 30 Gallons Water Capacity Up to 50 Gallons Water Capacity Up to 100 Gallons Water Capacity

50.0

62.5

100.0

6. In the event GMD’s…