TEMPORARY SEDIMENT CONTROL 221.02 damages to the environment or to third parties or which are found to violate any rule or regulation of any regulatory agency. Reimburse the Department for the actual cost of any reasonable leg al fees, liability, damage judgment or finding, fine, penalty, or expenses as a result of Contractor’s negligent acts or violations of the above noted laws in its performance of the Contract. Reimburse the Department within 10 calendar days of the amount o f assessment, damage judgment or finding, fine, penalty, or expense or the Department may withhold this amount from the Contractor’s next pay estimate or claim against the Contractor’s bond if estimates are inadequate and deliver that sum to the permitting agencies issuing the assessment, damage judgment or finding, fine, or penalty. These assessments are not to be construed as a penalty but are actual damages to recover the costs assessed against the Department due to the Contractor’s failure to comply with the above requirements.
221.01 Description
This work consists of constructing, maintaining, and removing the following items at locations shown on the Storm Water Pollution Prevention Plan (SWPPP): Temporary slope drains to avoid sheet flow on slopes; Temporary fiber logs to trap sediment along slopes, around inlets and across ditches; Temporary silt fences to prevent sediment from moving off the right -of-way; Temporary sediment filters to trap sediment and debris; Temporary sediment basins to collect sediment -laden runoff from disturbed areas; Temporary silt dikes to trap sediment at the toes of slopes, or across ditches and defined waterways; Temporary rock filter dams to dissipate the energy of flowing water and collect sediment near the toes of slopes, at upstream and downstream drainage structures, and in roadway ditches or defined waterways. Temporary bale barriers are not permitted under the OOPDES Gene ral Permit.
221.02 Materials
A.Temporary Slope Drain Use flexible tubing, plastic sheeting, plastic screen, burlap, asphalt, pipe, or other materials for temporary slope drains. For inlets, use wood, pipe end sections, or other solid material. Construc t outlets of loose rock, brush, straw, waste concrete, or pipe end sections.
B.Temporary Bale B arrier Temporary Bale Barriers are not permitted under the OPDES General Permit.
221.02 Temporary Sediment Control
C.Temporary Silt Fence Provide material for temporary silt fence in accordance with Subsection 712.06, “Filter Fabric for Silt Fence.” Use woven, polypropylene, polyester, or polyamide material that is resistant to ultraviolet degradation, mildew, and rot for temporary silt fence. Seal or selvag e the edges of woven fabrics to prevent unraveling. Use fabric at least 3 ft [0.9 m] wide. Use posts with length of at least 4 ft [1.1 m], and the ability to resist damage during installation and to support applied loads.
D.Temporary Sediment Filter Provide fiber log for Type I -A and I -B sediment filter in accordance with Subsection 221.02.H, “Temporary Fiber Log Provide ,” material for Type I-C sediment filter in accordance with Subsection 221.02.C, “Temporary Silt Fence.” Provide any type of available non -erodible material for Type II sediment filters, such as loose rock, broken concrete, or other salvageable materials.
E.Temporary Sediment Basin For both the inlet and outlet flows of the sediment basins, use the following: Loose rock capable of withstanding anticipated water velocity displacement, or Other non -erodible materials approved by the Resident Engineer. For Type I sediment basins, provide an outflow pipe with a diameter of at least 12 in [300 mm].
F.Temporary Silt Dike Provide materials for temporary silt dikes in accordance with Subsection 735.07, “Temporary Silt Dike Materials.” Provide No. 11 gauge wire staples, at least 6 in [150 mm] long.
G.Temporary Rock Filter Dam Provide materials in accordance with the following subsections: Material: Subsection: Stone Fill for Gabions 713.03 Wire Mesh 732.09 Filter Fabric 712.02 Provide ¾ in [19 mm], No. 6 Deformed Reinforcing Steel Bars for Rock Filter Dam Type 4.
H.Temporary Fiber Logs Provide fiber logs made of straw, excelsior, coir, or other similar materials as approved by the Engineer. Ensure the material is free of foreign weeds and fungi, and is free of growth or germination inhibiting s ubstances. Netting surrounding the log may be synthetic or natural fiber material. Fiber logs in an advanced state of decomposition prior to installation will not be accepted. Provide fiber logs having a minimum diameter of 12 inches [0.3 m] unless other wise specified. TEMPORARY SEDIMENT CONTROL 221.04 Provide stakes with a minimum cross section of 3/4 inch x 3/4 inch [19 mm x 19 mm], and a minimum length of twice the diameter of the fiber log.
221.03 Equipment — Vacant
221.04 Construction Methods
Construct temporary sediment control devices so that water is prevented from entering the driving lanes.
A.Temporary Slope Drain Construct diversion dikes in fill sections at the end of each day, and construct or extend slope drains at points along the diversion dikes. Construct slope drain s from the toe of the slope so that they may be extended as additional fill is completed. Provide inlets with each slope drain. Existing conditions and available materials will determine the type of outlet control. Place slope drains on back slopes as th e excavation of the cut area progresses, until the final grade is obtained and permanent controls are in place. Maintain slope drains and diversion dikes to ensure they are free of debris and open to the flow of water. Remove slope drains when permanent c ontrols are complete.
B.Temporary Bale Barrier Temporary bale barriers are not permitted under the OPDES General Permit .
C.Temporary Silt Fence Construct temporary silt fence to handle stress from hydraulic and sediment loading. Bury the bottom 6 in [1 50 mm] of the filter fabric in a trench to prevent undercutting. Backfill the trench and compact the soil over the fabric. Splice fabric ends together with hog rings, locking plastic ties, or other methods approved by the Resident Engineer. Space the pos ts no more than 5 ft [1.5 m] apart, and embed at least 1 ft [0.3 m]. Use hog rings, locking plastic ties, or other methods approved by the Resident Engineer to securely fasten the geotextiles to the upstream face of the posts to withstand pressure during storms. Maintain the integrity of the silt fences during construction to contain sediment runoff. Inspect temporary silt fences immediately after each rainfall, and at least daily during prolonged rainfall. Correct silt fence deficiencies immediately. M ake a daily review of the location of temporary silt fences in areas where construction activities have changed the natural contour and drainage runoff, to ensure that they are properly located for effectiveness. Remove accumulated sediment in accordance w ith Subsection 221.04. I, “Removal of Sediment,” and before it exceeds a depth of 6 in [150 mm]. Remove the fences when the Resident Engineer approves. After removing the fences, grade and dress the affected area to the Resident Engineer’s satisfaction.
221.04 Temporary Se Diment Control
D.Temporary Sediment Filter Construct sediment filters as soon as the inlets are completed to receive runoff water. Place fiber logs so that the water flow is slowed and goes over the fiber logs before entering the inlet. Place a temporary silt fence for Type I-C so that the water flow slows and goes through the fence before it enters the inlet. Place non -erodible filter material for Type II sediment filters so that the water will slow and flow over and through the ma terial before entering the inlet. Immediately repair damage to the filters. Remove accumulated sediment in accordance with Subsection 221.04. I, “Removal of Sediment.” Sediment filters may be removed as directed by the Resident Engineer.
E.Temporary Sediment Basin Shape inlets to confine the water to the defined channel as it enters the basin. Construct outlets to slow the velocity of water so the sediment basin will retain sediment. Either stockpile excavated material from construction of sediment basins or use it on the sediment basin dikes. Maintain sediment basins until permanent erosion control is complete. Remove accumulated sediment in accordance with Subsection 221.04 . I, “Removal of Sediment.”
F.Temporary Silt Dike Place silt dikes on the contour and in a row, with ends tightly abutting the adjacent silt dike. Overlap the ends of the filter material 6 in [150 mm] at adjacent silt dike sections and secure with wire staples. Ensure the sewn seam and front side of the silt dike section follow the approach apron. The exiting apron will lie underneath the silt dike section and extend out beyond the discharge side as indicated. If installing silt dikes across surface drai nage ditches, ensure the highest point of the silt dike in the center of the ditch is lower than the lowest point of the dike at either end. This will direct the water over the center of the silt dike and not around the ends. Place silt dikes along the co ntour, or at a 1 to 2 percent gradient, to a specified discharge point if installing them as diversion dikes. Inspect silt dikes after each rainfall and each 7 -day period. Repair deficiencies or damages at no additional cost to the Department. Remove sed iment in accordance with Subsection 221.04. I, “Removal of Sediment.”
G.Temporary Rock Filter Dam Place rock filter dams where erosion is expected, such as near the toe of slope, upstream and downstream of drainage s tructures, and in roadway channels or ditches. Construct rock filter dams with 4H:1V, or flatter, side slopes within clear zones, and 2H:1V side slopes outside clear zones. TEMPORARY SEDIMENT CONTROL 221.05 The Plans show the dimensions of rock filter dams. Secure rock filter dams Type 1 and 2 with wire mesh. Place rocks on the mesh to the specified heights. Fold the upstream side of the mesh over the rock, and secure to the downstream side using wire ties or hog rings. In streams, secure or stake the mesh to the streambed before placi ng rocks. Maintain at least 12 in [300 mm] between the top of the rock filter dam weir and the top of the embankment for filter dams at sediment traps. Embed rock filter dams at least 4 in [100 mm] into the existing ground. For rock filter dams Type 4, stake sack gabions with bars in accordance with Subsection 221.02.G, “Temporary Rock Filter Dam.” Inspect rock filter dams after each rainfall. Repair deficiencies or damages at no additional cost to the Department. Remove sediment in accordance with Subsection 221.04. I, “Removal of Sediment. ” When approved by the Engineer, rock filter dams can be left in place.
H.Temporary Fiber Logs Embed fiber logs 2 to 4 inches [50 mm to 100mm] into the soil. Place fiber logs in a row along the contour, or at a 1 to 2 percent gradient, with the ends tightly abutting the ad jacent fiber log, to a specified discharge point if installing them as diversion dikes. If installing fiber logs across surface drainage ditches, ensure the highest point of the fiber log in the center of the ditch is lower than the lowest point of the row of logs at either end. Inspect fiber logs within 24 hours after each rainfall, and each 7 day period. Immediately replace damaged logs. Repair deficiencies or damages at no additional cost to the Department. Remove fiber logs and sediment in accordance with Subsection 220.04.H.(5), “Removal of Control Measures.”
I.Removal of Sediment Remove sediment from control measures in accordance with Subsection 220.04.H(4), “Inspecti on and Maintenance of Measures. ” After completing sediment removal, leave control measures in a functioning condition. If control measures are damaged or inadvertently moved during the sediment removal process, immediately reinstall or replace at no addi tional cost to the Department. Before disposing of removed sediment in the right -of-way, obtain the Resident Engineer’s approval in accordance with Subsection 104.09, "Removal and Disposal of Salvaged Materials, Struct ures, and Obstructions." Remove fiber logs and sediment in accordance with Subsection 220.04.H.(5), “Removal of Control Measures.”
221.05 Method of Measuremen T
The Resident Engineer will measure the replacement of t emporary sediment control measures due to natural causes or as approved by the Resident Engineer. The Resident Engineer will measure installed temporary slope drains on each section of cut or fill slope. The Resident Engineer will measure the length of temporary silt fence in place.
221.06 Temporary Sediment Control
The Resident Engineer will measure the length of temporary silt dike in place. The Resident Engineer will measure rock filter dams by the volume of rock in place. The Engineer will measure the length of Temporary Fiber Log in place.
221.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.TEMPORARY SLOPE DRAINS Linear Foot [Meter]
B.TEMPORARY SILT FENCE Linear Foot [Meter]
C.TEMPORARY SEDIMENT FILTER Each
D.TEMPORARY SEDIMENT BASIN Each
E.TEMPORARY SILT DIKE Linear Foot [Meter]
F.TEMPORARY ROCK FILTER DAM Cubic Yard [Cubic Meter]
G.TEMPORARY FIBER LOG Linear Foot [Meter] Include the cost of construction, maintenance, and removal of temporary sediment control measures in the contract unit price for the appropriate temporary sediment control pay item. Include the cost of the following in the contract unit price for Temporar y Slope Drains : Inlets, Outlets, and Diversion dikes. Include the cost of the following in the contract unit price for Temporary Sediment Basin : Inlets, and Outlets. Include the cost of other materials required to construct or stake rock filter dams in the contract unit price for Temporary Rock Filter Dam . Include the cost of removing sediment trapped by the various temporary sediment control measures in the contract unit price for the appropriate temporary sediment control pay item. Include the cost of mat erials, installation, maintenance (including removal of accumulated sediment), and removal of Temporary Fiber Logs in the contract unit price. EROSION CONTROL MAT 228.04 SECTION 228 EROSION CONTROL MAT
228.01 Description
This work consists of providing and installing erosion control mat for lining ditches and protecting slopes.
228.02 Materials
Provide materials in accordance with the following subsections: Material: Subsection: Erosion Control Mat 735.04.F Seed 735.03 Mat Fasteners 735.05.B
228.03 Equipment – Vacant
228.04 Construction Methods
A.Placing Mat
1.Ditch and Slope Preparation Grade, shape, and finish ditch and slope surfaces before installing erosion control mat so that they are stable, firm, and free of rocks or obstructions that would puncture the mat or prevent it from directly contacting the ditch and slope surface.
2.Ditches Observe the planting seasons indicated. Apply the sprig, or seed indicated to the ditch surfaces before installing the mat. Uniformly distribute g rass seed at a rate of 6 lb per acre [6.7 kg per ha] on the exposed soil before installing the mat. Distribute the seed in accordance with Subsection 232.04.B(1), "Seeding Method A – Hydraulic Seeder Method," or Subsection 232.04.B(4), "Hand Broadcasting Method." Use three rows of mat for the standard ditch placement. Place the first row in the centerline of the ditch, then place the two side rows adjacent to the first on th e ditch slopes, using lap joints of at least 3 in [75 mm]. Dig an anchor slot transverse to the ditch centerline at least 12 in [300 mm] vertically into the soil at the terminal ends of the ditch, secure the mat in the anchor slot with fasteners, backfill the anchor slot with soil, and compact the backfilled soil to the density of the surrounding soil. Install a 6 in [150 mm] deep check slot on ditches with grades exceeding 6 percent transverse to the ditch centerline every 25 ft [7.5 m], and secure the mat in the check slots with fasteners.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 159–164 of 935.