LaurelMeadows_Specifications.pdf

Laurel Meadows Stream Improvement and

Riparian Reclamation Specifications

January 2025 March

Table of Contents

MOBILIZATION

EROSION AND SEDIMENT CONTROL

STABILIZED CONSTRUCTION ENTRANCE

CONCRETE WASHOUT

STOCKPILE

DEWATERING/DIVERSION

DEWATERING BAG

CLEARING AND GRUBBING

PERIMETER CONTROL

COMPOST SOCK

SILT FENCE

TREE REMOVAL

BEDDING STONE

RIPRAP, BOULDERS AND AGGREGATE

GEOTEXTILE FABRIC

EXCAVATION, FILLING, AND GRADING

CROSS VANE

BOULDER RIFFLE

BOULDER DROP

BANK TOES (BOULDER TOES, TOE ROCK, AND WOOD TOES)

SEWER CROSSING PROTECTION

COIR TURF REINFORCEMENT MATTING

SOIL LIFT

PERMANENT TRM

PERCUSSIVE DRIVEN EARTH ANCHOR (PDEA)

HARDWOOD STAKE

SEEDING, MULCHING AND VEGETATION ESTABLISHMENT

HYDRAULIC EROSION CONTROL PRODUCT

HYDRAULIC BIOTIC SOIL AMENDMENT

LIVE STAKES

TREE, SHRUB, AND PLUG PLANTING

GREENVILLE COUNTY 1 LAUREL MEADOWS

2025 MOBILIZATION

SPECIFICATION

MOBILIZATION

1 GENERAL

1.1 DESCRIPTION

Mobilization shall consist of furnishing, transporting, stockpiling, daily use and maintenance, and removal of all materials and equipment necessary for the full and successful completion of the project as defined in the Plans and these Specifications.

2. EXECUTION

Mobilization shall include, but not be limited to, the following activities:

A. Initial movement of personnel.

B. Moving all construction tools and other related equipment required to complete the work on site. Equipment must be cleaned (power washed off-site) prior to entering the project site to prevent the inadvertent spread/introduction of non-native species.

C. All other initial expenses and operations which must be performed before the beginning of the work.

D. Storage of equipment and materials on-site in designated areas and kept in clean and working order.

E. Maintenance of the site in a safe, secure, and reasonably orderly manner.

F. Demobilization, to include the removal of all tools, equipment, debris designated for removal, and personnel and the restoration of the site to a state satisfactory to the

County.

3. MEASUREMENT AND PAYMENT

Mobilization shall be measured and paid for as a lump sum (LS) item. This price shall include demobilization. No additional payment will be made for demobilization and remobilization because of shutdowns, suspensions of work, or other mobilization activities.

Fifty percent (50%) of the mobilization will be paid on the initial movement of equipment and personnel. Another 25% will be paid midway through the project. The last 25% will be paid at completion of demobilization and acceptance by the County that the site has been returned to stabilized conditions.

END OF SECTION

GREENVILLE COUNTY 2 LAUREL MEADOWS

2025 EROSION AND SEDIMENT CONTROL

EROSION AND SEDIMENT CONTROL

1 GENERAL

1.1 DESCRIPTION

This work consists of all work associated with Erosion and Sediment Control for the construction site before, during, and after construction. This will include implementation of the Stabilized

Construction Entrance, Concrete Washout, Perimeter Control, temporary cover and use of

Geotextile Fabric in accordance with the associated Plans and Specifications.

This work shall also include the preservation from injury or defacement of all vegetation and objects designated to remain.

2 PRODUCTS

2.1 MATERIALS

All materials used for Erosion and Sediment Control shall comply with the associated

Specifications.

3 EXECUTION

3.1 EROSION AND SEDIMENT CONTROL

The Contractor shall install the Stabilized Construction Entrance and Perimeter Control as indicated on the Plans and in accordance with the associated Specifications prior to any land disturbance activities.

Stabilization measures shall be initiated as soon as practicable in portions of the site that have been disturbed by construction activities, but no longer than fourteen (14) days after disturbing activities have ceased on a portion of the site.

All erosion and sediment control measures shall be inspected at least once during each calendar week and shall be repaired or replaced as necessary.

3.2 FINAL STABILIZATION

Final stabilization shall be implemented on all areas of the site that have been disturbed. These areas may include, but are not limited to, tree removals, areas adjacent to disturbances, areas used for access and staging, spoil pile areas, and areas disturbed during the removal of the Erosion and Sediment Control features.

Final stabilization may require the installation of Erosion Control Blankets, HECP, topsoil, seeding, and mulch. Obtain Engineer approval prior to implementation of final stabilization.

GREENVILLE COUNTY 3 LAUREL MEADOWS

2025 EROSION AND SEDIMENT CONTROL

4 MEASUREMENT AND PAYMENT

The pay item for Erosion and Sediment Control work will be as lump sum (LS). Activities shall comply with all appropriate Specifications as applicable. Erosion and Sediment Control, unless otherwise indicated shall be full compensation for all labor, materials, equipment, tools, transportation and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment is 50% upon approval of installation of

Stabilized Construction Entrance and Perimeter Control, 25% midway through the project, and the final 25% will be paid upon project completion and acceptable removal of all items to be removed.

Payment includes all direct and indirect costs and expenses required to complete the work.

GREENVILLE COUNTY 4 LAUREL MEADOWS

2025 STABILIZED CONSTRUCTION ENTRANCE

STABILIZED CONSTRUCTION ENTRANCE

1 GENERAL

1.1 DESCRIPTION

Install the stabilized construction entrance as shown on the Plans, which is a temporary stone-stabilized pad with a non-woven geotextile fabric underlining, at defined points of vehicular ingress and egress on the project site to reduce the amount of mud, dirt, and rocks transported onto public roads by vehicles, equipment, and runoff. Taper the edges of the entrance out towards the road to prevent tracking of mud at the edge of the entrance, and so that long vehicles do not leave the stabilized area when turning onto or off of the paved roadway.

This Specification also applies to the following:

• The stabilized construction entrance may be replaced with a track out mat or other similar manufactured product designed and marketed to reduce offsite tracking.

• The modified construction entrance included in this plan set, which is simply a narrower extension of the construction entrance.

2 PRODUCTS

2.1 MATERIALS

Provide a stabilized construction entrance composed of the following materials:

• Class 2 non-woven geotextile fabric, and

• Aggregate stone with the gradation in the following table.

Nominal Size (Sieves with

Square Openings) Percent Passing

3 in. 100

1-1/2 in. 35 – 100

¾ in. 0 - 15

3 EXECUTION

3.1 INSTALLATION

Install a stabilized construction access as shown on the Plans and at all defined points where traffic enters or leaves the project site and moving directly off or onto a public road. Use construction access in conjunction with the stabilization of construction roads to reduce the amount of mud picked up by vehicles.

GREENVILLE COUNTY 5 LAUREL MEADOWS

2025 STABILIZED CONSTRUCTION ENTRANCE

The stabilized construction access should have a typical width of 24 feet wide and can be modified as necessary to accommodate site constraints. Taper the edges of the entrance out towards the road to prevent tracking of mud at the edge of the entrance. If washing is used, make provisions to intercept the wash water and trap the sediment before it is carried offsite. Require washdown facilities as needed. In general, establish washdown facilities with crushed gravel and drain into a sediment trap or sediment basin. Remove all vegetation and any objectionable material from the foundation area. Install a Class 2 non-woven geotextile fabric before placing any stone. If necessary, install a culvert pipe across the entrance to provide positive drainage. Place the aggregate stone at a minimum depth of 6 inches uniform on top of the geotextile fabric.

3.2 INSPECTION AND MAINTENANCE OF STABILIZED CONSTRUCTION ACCESS

Inspect stabilized construction entrances every seven (7) days. Check for mud and sediment buildup and pad integrity. Wash, replace, or add stone whenever the entrance fails to perform effectively or as directed by the inspector. The stone in the entrance should be washed or replaced whenever the entrance fails to reduce mud being carried offsite by vehicles. Frequent washing will extend the useful life of the stone.

Reshape the stone pad as needed for drainage and runoff control. Brush or sweep up soil that has been tracked offsite immediately for proper disposal. Flushing should only be used when the water can be discharged to a sediment trap or basin. Maintain the stabilized construction access until the remainder of the construction site has been fully stabilized. Repair any broken pavement immediately.

If the aggregate material is being tracked offsite, limit larger vehicles from the construction site or use a larger diameter stone. If excessive sediment is being tracked onto the roadway, increase the length of the stabilized construction entrance.

4 MEASUREMENT AND PAYMENT

The pay item Stabilized Construction Entrance will be included in the lump sum (LS) for Erosion and Sediment Control. Activities shall comply with all appropriate Specifications as applicable.

Erosion and Sediment Control, unless otherwise indicated shall be full compensation for all labor, materials, equipment, tools, transportation, and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment is 50% upon approval of installation of Stabilized Construction Entrance and Perimeter Control, 25% midway through the project, and the final 25% will be paid upon project completion and acceptable removal of all items to be removed. Payment includes all direct and indirect costs and expenses required to complete the work.

GREENVILLE COUNTY 6 LAUREL MEADOWS

2025 CONCRETE WASHOUT

CONCRETE WASHOUT

1 GENERAL

1.1 DESCRIPTION

The purpose of the concrete washout is to minimize or eliminate the discharge of concrete waste materials into waterbodies. Concrete washouts must occur for any on-site process that includes the use of concrete, mortar, slurries containing Portland cement concrete or asphalt concrete, grout, and when any concrete trucks or concrete-coated equipment are washed on-site.

Concrete washout may occur in a chute washout box or chute washout bucket and pump, attached to a concrete truck. Equipment washing or on-site chute washing shall be done in an above-ground washout pit with a minimum size of 10 feet by 10 feet.

2 PRODUCTS

Plastic lining material must be a minimum of 10-milimeter polyethylene sheeting that is free of holes, tears, or other defects that may compromise the impermeability of the material.

3 EXECUTION

Concrete washout facilities should be located at least 50 feet from any surface waters, as shown on the Construction Drawings. The soil base shall be prepared to be free of rocks or other debris that may cause tears or holes in the liner. The pit shall be constructed prior to the initiation of any process involving concrete, grout, or other material that will need use of the washout. Pit shall be of adequate size to accommodate sufficient volume to completely contain all liquid and water concrete materials generated during washout procedures, maintaining a freeboard of at least four inches. This pit shall be constructed of hay bales and plastic lining.

Facility should be cleaned out upon reaching 75% of its capacity. Following disposal of concrete washout waste into the washout pit, the slurry shall be allowed to dry and then disposed of as solid waste. If the plastic lining is damaged during the removal, plastic linins must be replaced.

GREENVILLE COUNTY 7 LAUREL MEADOWS

2025 CONCRETE WASHOUT

The pay item for concrete washout, if implemented by the Contractor, shall be included in the lump sum (LS) for Erosion and Sediment Control. Activities shall comply with all appropriate

Specifications as applicable. Erosion and Sediment Control, unless otherwise indicated shall be full compensation for all labor, materials, equipment, tools, transportation and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract.

Payment is 50% upon approval of installation of Stabilized Construction Entrance and Perimeter

Control, 25% midway through the project, and the final 25% will be paid upon project completion and acceptable removal of all items to be removed. Payment includes all direct and indirect costs and expenses required to complete the work.

GREENVILLE COUNTY 8 LAUREL MEADOWS

2025 STOCKPILE

STOCKPILE

1 GENERAL

1.1 DESCRIPTION

This work consists of the placement, storage, and erosion protection and sediment control of stockpiled material. Stockpiles should be used for any material that will not be utilized, stabilized, or removed from site within a 7-day period or if rainfall is forecasted. Proposed stockpile locations are shown on the plan set. However, they may be placed in other locations as site conditions allow and approved by the Engineer.

2 PRODUCTS

2.1 MATERIALS

All stockpiles shall be installed as shown in details. Please refer to the corresponding Specifications and Details for the following erosion protection and sediment control products:

• Permitter control: Silt Fence or Compost Sock

• Temporary cover (if untouched for more than 14 days)

3 EXECUTION

Sediment stockpiles are constructed when temporarily stored material is to be in a place for more than 7-days or when rain is forecasted. The stockpile should be surrounded by silt fence or soil sock with at least a 3-foot minimum distance between the toe of the stockpiled sediment and the sediment control measure. Maintenance shall occur when sediment build-up behind the sediment behind the silt fence of sediment tub reaches a level that requires maintenance according to their

Specifications. All stockpiles shall be seeded if stockpiled for 60 days or more.

4 MEASUREMENT AND PAYMENT

The pay item for stockpiles shall be incidental and included in the lump sum (LS) for Erosion and

Sediment Control. Activities shall comply with all appropriate Specifications as applicable. Erosion and Sediment Control, unless otherwise indicated shall be full compensation for all labor, materials, equipment, tools, transportation, and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment is 50% upon approval of installation of Stabilized Construction Entrance and Perimeter Control, 25% midway through the project, and the final 25% will be paid upon project completion and acceptable removal of all items to be removed. Payment includes all direct and indirect costs and expenses required to complete the work.

GREENVILLE COUNTY 9 LAUREL MEADOWS

2025 DEWATERING/DIVERSION

DEWATERING/DIVERSION

This work shall consist of maintaining and diverting stream flow for the purpose of isolating work areas when construction activities take place within the stream channel and the Contractor elects to work under dry conditions, as indicated in these Specifications.

2 PRODUCTS

Sandbags shall consist of materials which are resistant to ultraviolet radiation, tearing, and puncture and woven tightly enough to prevent leakage of fill material (i.e. sand, fine gravel, etc.).

Sheeting shall consist of polyethylene plastic, which is impervious and resistant to puncture and tearing.

Pump(s) shall be large enough to maintain uninterrupted base flow to the channel downstream of the work area. The pump around shall include a hose suitable to convey water overland to the downstream section. Minimum linear feet of hose required is equivalent to the maximum estimate for one workday provided by the Contractor. The pump shall be shut off at night and baseflow shall flow through the completed and stabilized portion of the project into the existing downstream channel.

Dewatering bags made of non-woven geotextile as specified in the Contract Documents shall be used for dewatering the turbid water within the active work area.

3 EXECUTION

Installation of sand bags, sheeting, and pump around shall be in accordance with the erosion and sediment control details, and in a manner to minimize downstream impacts.

The diversion structure shall be installed from upstream to downstream.

The height of the sand bag diversion structure shall be a minimum of baseflow depth plus one foot, and a minimum of 2 feet. Further, the sand bag diversion shall be of sufficient height as to provide a pool deep enough to maintain pumping operations.

Sheeting shall overlap the sandbags such that the upstream portion covers the downstream sandbag face with at least an 18 inch overlap.

GREENVILLE COUNTY 10 LAUREL MEADOWS

2025 DEWATERING/DIVERSION

When dewatering the work area, the pump shall discharge into dewatering bags, in accordance with the associated Specification. The dewatering bag must be placed within the Project Limits on a flat surface to allow dewatering without creating erosive conditions in the area of the outfall.

4 MEASUREMENT AND PAYMENT

The pay item for Dewatering/Diversion shall be an incidental to the associated line items for which the dewatering is implemented. Some examples that may require dewatering or diversion may include instream structures, such as vanes or riffles, as well as bank toe treatments. Price and payment shall be full compensation for all labor, materials, equipment, tools, transportation and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment is 100% upon approval of acceptable application meeting the requirements of this Specification. The payment includes all direct and indirect costs and expenses necessary to complete and remove the work.

GREENVILLE COUNTY 11 LAUREL MEADOWS

2025 DEWATERING BAG

DEWATERING BAG

1 GENERAL

1.1 DESCRIPTION

Dewatering Bags shall be fabricated from non-woven geotextile materials that filter sediment-laden water from dewatering operations. Sediment laden water is pumped into the non-woven geotextile fabric bag that allows filtered water to pass through.

This project does not require the use of a dewatering bag. This specification is included to provide the contractor with an additional option for the management of sediment-laden water on site.

2 PRODUCTS

2.1 MATERIALS

Use Dewatering Bags composed of a UV resistant, non-woven geotextile sewn into a completely enclosed bag. Use Dewatering Bags sewn with high strength double stitched seams. Use

Dewatering Bags that have a sewn-in sleeve to receive the pump discharge hose.

The Dewatering Bag shall comply with the properties identified in the table below.

Property Test Method Value

Weight (ox/yd2) (typical) ASTM D5261 10 oz

Grab Tensile Strength (MD) ASTM D4632 250 lbs.

Mullen Burst ASTM D3786 350 psi

UV Resistance ASTM D4355 70% @ 500 hrs.

Flow Rate (gal/min.ft2) ASTM D4491 70

Filtering Efficiency ASTM D5141 80%

GREENVILLE COUNTY 12 LAUREL MEADOWS

2.2 QUALITY ASSURANCE

Provide Dewatering Bags listed on the most recent edition of SCDOT Qualified Product List.

At the time of delivery, provide the Engineer with the Dewatering Bag packing list containing complete identification, including but not limited to the following:

• Manufacturer’s name and location.

• Manufacturer’s telephone number and fax number.

• Manufacturer’s e-mail address and web address.

• Dewatering Bag name, model, and/or serial number.

• Dewatering Bag dimensions.

• Certification that the Dewatering Bag meets the physical and performance criteria of this Specification.

3 EXECUTION

3.1 EQUIPMENT

Ensure that the equipment necessary for the proper installation of the work is on site, in acceptable working condition, and approved by the Engineer as to both type and condition before the start of work. Provide sufficient equipment to enable prosecution of the work in accordance with the project schedule and completion of the work in the specified time.

3.2 SITE ASSESSMENT

Assess the proposed site by considering potential water quality impacts and methods to minimize potential impacts from the following site characteristics:

• Potential contaminates in the water to be filtered. Note any odor, discoloration, oil sheen, or other notable conditions. Contact SCDHEC Land & Waste Emergency Response if a hazardous spill is suspected.

• Location of the discharge from the Dewatering Bag.

• Transport method and distance to nearest receiving waters.

When practical, select dewatering locations that are not in close proximity to receiving surface waters. Select locations with a sufficient permeable buffer to allow natural infiltration instead of discharging to receiving surface waters. Do not place Dewatering Bags directly in jurisdictional waters of the state.

3.3 DEWATERING BAG SELECTION

Use the following steps to select an appropriately sized Dewatering Bag. Consult with the Engineer to select Dewatering Bag size if insufficient information is known about the site conditions.

1. Determine the peak flow rate generated from the dewatering pump in gallons per minute.

2. Determine the peak flow rate through the Dewatering Bag in gallons per minute based on the Dewatering Bag peak flow rate and the total surface area provided by the

GREENVILLE COUNTY 13 LAUREL MEADOWS

manufacturer.

3. Select a Dewatering Bag that passes a minimum of two times the peak flow rate generated from the dewatering pump as determined in Step 1 to account for a 50% clogging factor.

3.4 INSTALLATION

Install the Dewatering Bag on a mild slope to ensure incoming water flows downhill through the Dewatering Bag. Secure the hose to bag connection using a heavy duty pipe clamp, rope, or other suitable means to prevent leakage. When using a rope to attach the pump hose to the Dewatering Bag, make a minimum of 6 wraps around the hose over a 6-inch width of the bag and fasten with a secure rope knot. The bottom area of Dewatering Bags will not allow flow to pass through when the bag is placed on a low- permeable or impermeable surface.

Place the Dewatering Bag on an aggregate, hay bales, or other highly permeable surface to maximize water flow through the entire surface area of the bag. Monitor the Dewatering Bag at all times while the pump is running. While monitoring, ensure the hose to bag connection is secure with only minimal leaking. Check for flow permeating from the bottom Surface of the Dewatering Bag. If flow appears restricted, move bag to a surface with higher permeability.

3.5 REMOVAL

Dispose of the Dewatering Bag as directed by the Engineer. If allowed, the Dewatering Bag may be cut open and the contents seeded after removing the fabric. Securely tie off the pump hose connection sleeve when transporting full Dewatering Bags for disposal. Do not clean and reuse a Dewatering Bag after the voids are clogged with trapped sediment.

3.6 INSPECTION AND MAINTENANCE

Follow all manufacturer recommendations for inspection and maintenance guidelines. Replace Dewatering Bags when trapped sediment has accumulated to 50% of the bag capacity or in accordance with the manufacturer’s recommendations.

Dewatering Bags are full when they no longer efficiently filter sediment or pass water at a reasonable rate. Incoming flow rates will vary depending on the size of the Dewatering Bag, the type and amount of sediment discharged into the Dewatering Bag, the permeability of the underlying aggregate, and the degree of slope on which the bag lies.

3.7 ACCEPTANCE

Obtain Engineer acceptance and approval of Dewatering Bag installations. When requested by the Engineer, ensure that a manufacturer’s representative is on-site to oversee and approve the initial installation of Dewatering Bag operations. Obtain a letter from the manufacturer approving the installation when requested by the Engineer.

GREENVILLE COUNTY 14 LAUREL MEADOWS

The pay item for Dewatering work will be included and incidental to other line items. Most commonly it will fall under to the Dewatering/Diversion Pay item, but in select circumstances, may also be incidental to the Erosion and Sediment Control lump sum (LS). Payment shall be full compensation for installing the Dewatering Bag as specified or directed and includes furnishing, installing, maintaining, inspecting, removing, and disposing of the Dewatering Bag; providing, installing and operating pumps for Dewatering operations; providing documentation of Quality

Control and Quality Assurance programs; and all other materials, labor, equipment, tools, supplies, transportation, and incidentals necessary to fulfill the requirements of the pay item in accordance with the Plans, Specifications, and other terms of the Contract.

GREENVILLE COUNTY 15 LAUREL MEADOWS

2025 CLEARING AND GRUBBING

CLEARING AND GRUBBING

1 GENERAL

1.1 DESCRIPTION

This work consists of clearing, grubbing, removing, and disposing of all vegetation, debris and obstructions within the identified areas on the Plans, except such objects as are designated to remain, or are to be otherwise removed in accordance with the Plans or other sections of these

Specifications. This work shall also include the preservation from injury or defacement of all vegetation and objects designated to remain.

The Engineer will establish the limits of disturbance as shown on the Plans and will designate all trees, shrubs, plants, and other items to be removed. Trees, plant specimens or other objects considered valuable by adjacent property owners or aesthetically desirable and which are designated by the Engineer to remain, shall not be removed or damaged. When Clearing ad

Grubbing, the Contractor shall exercise care to avoid cutting, damaging or destroying any timber outside of the limits of disturbance as shown on the Plans. Likewise, the Contractor shall not cut, damage, or destroy timber outside the limits of disturbance unless the Plans or special provisions provide for clearing such other areas necessary to complete the work. Any damage to natural terrain or to vegetation or objects to remain shall be repaired, replaced, or otherwise compensated for, as determined by the County or Engineer, at the expense of the Contractor.

2 EXECUTION

Clearing and grubbing work shall be performed before other construction work in the same general area is started. No clearing and grubbing shall occur until appropriate sediment and erosion control measures are in place.

Within areas where excavation is to be made and where embankments are to be constructed, the ground shall be cleared of all vegetation, stumps, rubbish, logs, roots, foundations utility connections not in service, and other objectionable material hereinafter indicated or considered necessary to satisfactorily complete the work.

This work shall also include the removal and disposal (or salvage if so required by the County) of fences, posts, signs, structures, and other obstructions that interfere with the work and that are not to be adjusted or relocated.

All areas to be excavated shall be grubbed. Stump holes and other holes from which obstructions are removed, except in areas to be excavated, shall be backfilled, and compacted with suitable material in accordance with the Excavation, Filling, and Grading Specification.

All materials removed by the clearing and grubbing operation shall be removed from the project, or otherwise disposed of as specified or directed at the expense of the Contractor. Material may

GREENVILLE COUNTY 16 LAUREL MEADOWS

2025 CLEARING AND GRUBBING

not be burned. The Contractor shall be responsible for obtaining disposal sites and securing any applicable State, Federal, County or City permits that may be required. The Contractor shall certify in writing to the County that all permit requirements have been met before placing any material in a disposal area.

Brush, weeds and other designated vegetation, shall be re-cut immediately before final inspection if considered necessary by the County.

3 MEASUREMENT AND PAYMENT

The pay item for Clearing and Grubbing work will be area (AC). Price and payment shall be full compensation for all labor, materials, equipment, tools, transportation, and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract.

Payment is 100% upon approval of acceptable application meeting the requirements of this

Specification. The payment includes all direct and indirect costs and expenses necessary to complete the work.

GREENVILLE COUNTY 17 LAUREL MEADOWS

2025 PERIMETER CONTROL

PERIMETER CONTROL

1 GENERAL

1.1 DESCRIPTION

Perimeter Control is used as a temporary sediment control practice on sites where there will be soil disturbance due to construction activities. Perimeter Control consists of a sediment control barrier supported by posts. Use Perimeter Control as a sediment control practice for sheet flow runoff conditions. Do not use Perimeter Control for areas receiving concentrated flow.

2 MATERIALS

Please refer to product specifications for Silt Fence and Compost Socks.

3 EXECUTION

3.1 SITE PREPARATION

Proper site preparation is essential to ensure Perimeter Control is in complete contact with the underlying soil or underlying surface or is installed in a manner where runoff cannot undermine the Perimeter Control. Remove all rocks, clods, vegetation, or other obstructions that would prevent the installed Perimeter Control from having direct contact with the underlying soil or surface.

3.2 GENERAL INSTALLATION

Install Perimeter Control before any land disturbance in the designated areas has started.

Install Perimeter Control perpendicular to the direction of flow and at the proper distance from the toe of slopes as shown in the table below to provide sediment storage and access for maintenance and cleanout.

Table 2: Perimeter Control Installation Dimensions

Height of Fill

(ft) Fill Slope

Minimum Offset from Toe of

Slope (ft)

Minimum Right of

Way Offset From

Toe of Slope (ft)

< 6

2:1

4:1

6:1

2 3

GREENVILLE COUNTY 18 LAUREL MEADOWS

6-10

2:1 12* 13*

4:1

6:1 3 4

>10

2:1 12* 13*

4:1

6:1 4 5

* The minimum offsets of each group of height of fill cannot be reduced unless curb and gutter or some other feature reduces the flow of water down the slope.

Install Perimeter Control using wooden posts with a minimum measured dimension of 3/4 inch x

3/4 inch and a maximum measured dimension of 2 inches x 2 inches, or using steel posts (1.25 lbs/ linear foot) a minimum of 4 feet in length. Space posts or stakes on maximum 4-foot centers and drive them into the ground to a depth of 2 feet or to the maximum extent practicable.

Install Perimeter Control in continuous lengths to avoid joints. When joints are necessary, lap the ends of adjacent Perimeter Control with a minimum six (6) inch overlap to prevent flow and sediment from passing through the field joint.

When installing Compost Socks for Perimeter Control on a soil surface, construct a small U-shaped trench to a depth that is 20% of the perimeter control diameter/height. Lay the Compost Socks for Perimeter Control flat in the U-shaped trench and compact the upstream Perimeter Control soil interface with the excavated soil.

Install the posts in the middle, or on the downstream third of the Compost Socks for Perimeter

Control or install posts per the manufacturer’s recommendation.

Compost Socks for Perimeter Control weighing more than 14-pounds per linear foot do not require posts, trenching, or additional filter media. In areas where concentrated flow is experienced, backfill Compost Socks for Perimeter Control weighing more than 14-pounds per foot with No. 5 or No. 57 filter media on the upstream side of the Compost Socks for Perimeter Control to increase the contact area with the underlying soil or surface, increase filter size, slow down flow, capture more sediment, and reduce undercutting.

3.3 DELIVERY, STORAGE, AND HANDLING

Follow the manufacturer’s written storage and handling procedures for Perimeter Control labeling, shipment, and storage. Clearly show the Perimeter Control manufacturer or supplier name on product labels.

Store Perimeter Controls off the ground and cover them to adequately protect them from the following:

GREENVILLE COUNTY 19 LAUREL MEADOWS

• Construction damage.

• Precipitation.

• Extended exposure to ultraviolet radiation including sunlight.

• On-site chemicals.

• Flames and sparks.

• Excess temperatures.

• Other environmental conditions that can damage the physical properties.

3.4 INSPECTION AND MAINTENANCE

Inspect Perimeter Control after installation to ensure that no gaps exist under the Perimeter

Control or between the joints of adjacent ends of Compost Socks.

Inspect Perimeter Control every seven (7) days. Check where runoff has eroded a channel beneath the Perimeter Control, or where the Perimeter Control has sagged or collapsed by overtopping.

Repair rills, gullies, and undercutting near the Perimeter Control.

Remove sediment deposits that impair the sediment control capability of the Perimeter Control when the sediment reaches one-third (1/3) of the height of the exposed Perimeter Control.

Remove trapped sediment or stabilize on site. If a Perimeter Control or portion of Perimeter

Control is located in an area where removing the sediment is not possible, install a second

Perimeter Control, if necessary, at the direction of the Engineer.

Remove and/or replace installed Perimeter Control as required to adapt to changing construction site conditions. Review daily the location of Perimeter Control in areas where construction activities have changed the natural contour and runoff pattern to ensure that the Perimeter

Control is properly located for effectiveness. Install additional Perimeter Control as directed by the

Owner’s Representative where deficiencies exist.

When the functional longevity of the Perimeter Control is exceeded as determined by the Engineer or manufacturer’s representative, remove them from the site.

Remove Perimeter Control within 30 days after final stabilization is achieved or after temporary

Best Management Practices (BMPs) are no longer needed. Permanently stabilize disturbed areas resulting from Perimeter Control removal. The Perimeter Control material remains the property of the Contractor and may be used in other locations provided the materials meet the appropriate requirements contained in this Specification and/or on the Plans.

Gather and dispose Perimeter Control in regular means as non-hazardous, inert material. Before final stabilization, backfill all trenches, depressions, or other ground disturbances caused by the removal of Perimeter Control.

GREENVILLE COUNTY 20 LAUREL MEADOWS

The pay item for Perimeter Control will be included in the lump sum (LS) for Erosion and Sediment

Control. Activities shall comply with all appropriate Specifications as applicable. Erosion and

Sediment Control, unless otherwise indicated shall be full compensation for all labor, materials, equipment, tools, transportation, and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment for Erosion and Sediment

Control is 50% upon approval of installation of Stabilized Construction Entrance and Perimeter

Control, 25% midway through the project, and the final 25% will be paid upon project completion and acceptable removal of all items to be removed. Payment includes all direct and indirect costs and expenses required to complete the work.

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2025 COMPOST SOCK/SEDIMENT SOCK

COMPOST SOCK

1 GENERAL

1.1 DESCRIPTION

This work consists of the placement of Compost Socks indicated on the Plans to provide protection as perimeter control. Tubes are filled with compost or growing media that supports the growth of stabilizing vegetation. This system can be placed and filled in place and will to maximize contact of the system with the undercut bank to improve structural integrity and minimize erosion around the product.

2 PRODUCTS

2.1 MATERIALS

Compost socks shall be 9-12-inch diameter, comprised with a mesh filled with high quality growing media or compost. Use a mesh for this application that is either biodegradable or can be cut and removed. Minimum length is 8 feet. There is no maximum length.

Use hardwood stakes, 2 inches by 2 inches in size, no less than 36 inches in length.

3 EXECUTION

3.1 PREPARATION

Compost socks are to be installed in such a way to cause minimal disturbance to the existing stream while preventing further undercutting of the bank. No roots, stones, or other natural objects shall be removed from the undercut bank during placement of the compost socks without approval from the Engineer.

3.2 INSTALLATION

Compost socks can be placed as show on the Plans as necessary, using equipment that will not damage the netting. They may also be filled in place. Hardwood posts shall be placed at each end of the sock, in an overlapping pattern. Hardwood posts shall be driven into the tube at a minimum spacing of every 10 feet.

If used instream, the compost socks are to be hand placed in the undercut portions of the bank while causing -minimal disturbance to the existing stream bed and bank. The size of the socks shall be as indicated above. In undercut banks, the sock may be placed within the undercut bank and then filled with the media to obtain maximum contact between the sock and the undercut bank.

If instream, the upstream end of the compost sock shall be keyed into the channel bottom or be secured with staking and a boulder. Abutting compost socks shall be leveled with each other and

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2025 COMPOST SOCK/SEDIMENT SOCK

placed tightly against one another to encourage a seal and prevent water seeping and erosion. A continuous length shall be used whenever possible. Hardwood stakes shall be installed through the middle of the socks at no less than 10-foot intervals. Stakes shall also be placed at the ends of all socks.

After installation, the compost socks shall be seeded as directed in these Specifications.

3.3 INSPECTION AND MAINTENANCE

Inspect compost socks every 7 days or after a storm than produces more than 0.5 inches of rain.

Check for damage, dislocation, or movement. Ensure that placement remains steady over the course of the project and repair or replace tubing or stakes as necessary.

4 MEASUREMENT AND PAYMENT

The pay item for Perimeter Control will be included in the pay item for Erosion Control (LS).

Activities shall comply with all appropriate Specifications as applicable. Erosion and Sediment

Control, unless otherwise indicated shall be full compensation for all labor, materials, equipment, tools, transportation and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment is 50% upon approval of installation of

Stabilized Construction Entrance and Perimeter Control, 25% midway through the project, and the final 25% will be paid upon project completion and acceptable removal of all items to be removed.

Payment includes all direct and indirect costs and expenses required to complete the work.

GREENVILLE COUNTY 23 LAUREL MEADOWS

2025 SILT FENCE

SPEICIFICATON

SILT FENCE

1 DESCRIPTION

Silt Fence is used as a temporary sediment control measure around areas where there will be soil disturbance due to construction activities. Silt Fence consists of filter fabric stretched across posts. The lower edge of the fence is vertically trenched into the ground and covered by compacted backfill. Silt Fence is classified as either without reinforcement or with reinforcement.

2 MATERIALS

Provide material for Silt Fence complying with the requirements of this Specification, on the

Plans and details, or as approved by the Engineer.

2.1 Steel Posts

Furnish steel posts meeting the following minimum physical requirements:

• Minimum length of 5 feet.

• Composed of high strength steel with minimum yield strength of 50,000 psi.

• Standard “T” section with a nominal face width of 1.38 inches and nominal “T” length of 1.48 inches.

• Weighs 1.25 pounds per foot (8%).

• Painted with a water based baked enamel paint.

2.2 Geotextile Filter Fabric

Provide a geotextile filter fabric meeting the requirements of Table 2.

Ensure the filter fabric is composed of fibers consisting of long chain synthetic polymers composed of at least 85% by weight of polyolefins, polyesters, or polyamides. Ensure that the fibers are formed into a network so that the filaments or yarns retain dimensional stability relative to each other. Do not treat or coat the filter fabric with materials which might adversely alter its physical properties after installation. Do not use fabric with defects or flaws that significantly affect its physical and/or filtering properties.

Provide a filter fabric with a minimum roll width of 36 inches.

Protect the filter fabric with a suitable wrapping for protection against moisture and extended ultraviolet exposure before placement.

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Table 2: Minimum Geotextile Filter Fabric Performance and Physical Requirements

Physical Property* Test Method Required Value

Filtering Efficiency Performance*

ASTM D 5141

or Equivalent

80% Total Suspended Solids (TSS)

Tensile Strength ASTM D 4632 90 lbs

Ultraviolet Stability (retained strength after 500 hrs of ultraviolet exposure)

ASTM D 4355 70%

*Unless otherwise indicated, numerical values represent the MARV.

2.3 Reinforced Silt Fence

The reinforced Silt Fence system is composed of steel or other approved posts, geotextile filter fabric, and of 6-inch by 6-inch 14-gage wire mesh. Use steel posts and geotextile materials specified in Section 1.3.1.

3 EXECUTION

3.1 General Installation

• Construct Silt Fence in accordance with the Plans or as approved by the Engineer. Install

Silt Fence before major land disturbing activities begin.

• Install Silt Fence across the slope along a line of uniform elevation (perpendicular to the direction of flow).

• Install Silt Fence a minimum 10 feet from the toe of steep slopes to provide sediment storage and access for maintenance and cleanout.

• Do not place Silt Fence across channels.

• In areas where conditions warrant, larger posts or reduced post spacing may be required to provide an adequate fence to handle the stress from sediment loading.

• Where applicable or as directed by the Engineer, install Silt Fence checks every 100 feet at a maximum and at low points.

3.2 Non-reinforced Silt Fence Installation

1. Excavate a trench approximately 4 inches wide and 8 inches deep and place 12 inches of geotextile fabric into the 8-inch-deep trench, extending 4 inches towards the upslope side of the trench.

2. Backfill the trench with soil or gravel and compact.

3. Bury 12 inches of fabric into the ground when pneumatically installing Silt Fence with a slicing method.

4. Purchase geotextile fabric in continuous rolls and cut to the length of the barrier to avoid

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joints. When joints are necessary, wrap the fabric together at a support post with both ends fastened to the post, with a 6-inch minimum overlap.

5. On the downslope side of the trench, install steel posts to a minimum depth of 18 inches.

Install posts protrude 1 to 2 inches minimum above the fabric, with no more than 3 feet of the post protruding above the ground.

6. Space posts on a maximum of 6-foot centers.

7. Attach fabric to the steel posts using heavy-duty plastic or wire ties that are evenly spaced and placed in a manner to prevent sagging or tearing of the fabric. In all cases, affix ties in no less than 4 places spaced a maximum of 6 inches apart.

8. Install the fabric to a minimum height of 18 inches and maximum of 24 inches above the ground. When necessary, the height of the fence above ground may be greater than 24 inches.

3.3 Reinforced Silt Fence Installation

1. Excavate a trench approximately 4 inches wide and 8 inches deep and place 12 inches of geotextile fabric into the 8-inch-deep trench, extending 4 inches towards the upslope side of the trench.

2. Extend the 6-inch by 6-inch 14-gage wire mesh into the trench to a minimum depth of 8 inches.

3. Backfill the trench with soil or gravel and compact.

4. Purchase geotextile fabric and wire mesh in continuous rolls and cut to the length of the barrier to avoid joints. When joints are necessary, wrap the fabric together at a support post with both ends fastened to the post, with a 6-inch minimum overlap.

5. On the downslope side of the trench, install steel posts to a minimum depth of 18 inches.

Install posts protrude 1 to 2 inches minimum above the fabric, with no more than 3 feet of the post protruding above the ground.

6. Space posts on a maximum of 6-foot centers.

7. Attach fabric and wire mesh to the steel posts using heavy-duty plastic or wire ties that are evenly spaced and placed in a manner to prevent sagging or tearing of the fabric and wire mesh. In all cases, affix ties in no less than 4 places spaced a maximum of 6-inches apart.

8. Install the filter fabric and wire mesh fabric to a minimum height of 18 inches and maximum of 24 inches above the ground. When necessary, the height of the fence above ground may be greater than 24 inches.

3.4 Double Row Silt Fence

When double row Silt Fence is specified on the Plans, the same design, material, and construction requirements are applicable. Double row Silt Fence shall have a minimum spacing of 3 feet and a maximum spacing of 5 feet between the two rows.

3.5 Inspection and Maintenance

Inspect Silt Fence every seven (7) days and inspections are recommended within 24-hours after each rainfall event that produces ½-inches or more of precipitation until final stabilization is achieved. Immediately correct any deficiencies. Check for sediment buildup and fence integrity.

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Check where runoff has eroded a channel beneath the Silt Fence, or where the Silt Fence has sagged or collapsed by fence overtopping.

Remove fabric and replace whenever it has deteriorated to such extent that it reduces the effectiveness of the Silt Fence system. In addition, review daily the location of Silt Fence in area where construction activities have changed the natural contour and drainage runoff to ensure that the Silt Fence is properly located for effectiveness. Install additional Silt Fence as directed by the Engineer where deficiencies exist.

Maintain Silt Fence until its capacity has been reached or erosion activity in the area has been stabilized. Remove sediment accumulated along the fence when it reaches approximately one-third (1/3) the height of the Silt Fence, especially if heavy rains are expected. Remove trapped sediment or stabilize on site.

If Silt Fence is in an area where removing the sediment is not possible, install a second Silt Fence, if necessary, at the direction of the Engineer.

Remove Silt Fence within 30 days after final stabilization is achieved or after temporary Best

Management Practices (BMPs) are no longer needed. Permanently stabilize disturbed areas resulting from Silt Fence removal.

4 MEASUREMENT AND PAYMENT

The pay item for Silt Fence, if implemented by the Contractor, shall be an incidental to the associated line items for which the Silt Fence is implemented (Stockpile), which falls under the lump sum (LS) for Sediment and Erosion Control. Price and payment shall be full compensation for all labor, materials, equipment, tools, transportation and supplies required to complete the work in accordance with the Plans, Specifications, and other terms of the Contract. Payment is

100% upon approval of acceptable application meeting the requirements of this Specification.

The payment includes all direct and indirect costs and expenses necessary to complete the work, including Silt Fence removal.

GREENVILLE COUNTY 27 LAUREL MEADOWS

2025 TREE REMOVAL

TREE REMOVAL

1 GENERAL

1.1 DESCRIPTION

This work consists of tree removal on stream banks and in surrounding riparian areas, to include tree cutting, stump grinding, and organic debris removal, and removal of trees from the site as indicated in the Plans. Only trees designated for removal on the Plans shall be removed.

2 PRODUCTS

2.1 EQUIPMENT

The Contractor shall be responsible for providing and maintaining the equipment required for tree removal.

3 EXECUTION

3.1 SMALL TREE REMOVAL

Small trees are defined as those with a Diameter at Breast Height (DBH) smaller than ten (10) inches in diameter and most are not specifically shown on the Plans. Small trees may be cleared when necessary to complete work in certain areas with the approval of the Engineer. These trees may be removed as part of the clearing and grubbing where specified, however, please consult the Engineer for any unmarked tree greater than six (6) inches in diameter.

3.2 ALONG STREAMBANK

Cut the tree at ground level when the removal of the stump below the exiting ground level is not required to satisfy the grading plan in order to maximize bank stabilization. In cases where ground level cuts are feasible, do not treat the stumps with herbicide unless instructed to do so by the

Engineer or representative.

3.3 WITHIN AND NEAR BMPS

Trees marked for removal are to have root balls removed as part of the excavation of the BMP.

Only when required, the Contractor shall follow the Site Excavating, Filling and Rough Grading

Specification and the Seeding Specification following tree removal to ensure the void is properly stabilized.

3.4 LARGE TREE REMOVAL

Large trees are those with a DBH of greater than ten (18) inches and are shown on the Plans. These large trees intended for removal are marked in the plan and additionally will be marked in the field with orange flagging tied around the tree trunk.

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2025 TREE REMOVAL

3.5 ALONG STREAMBANK

Cut the tree at ground level when the removal of the stump below the exiting ground level is not required to satisfy the grading plan in order to maximize bank stabilization. In cases where ground-level cuts are feasible, do not treat the stumps with herbicide unless instructed to do so by the

Engineer or representative.

3.6 WITHIN AND NEAR BMPS

Trees marked for removal are to have root balls removed as part of the excavation of the BMP.

Only when required, the Contractor shall…