902Temporary Erosion and Sediment Control

–TEMPORARY EROSION AND SEDIMENT CONTROL TEMPORARY EROSION AND SEDIMENT CONTROL

902.1DESCRIPTION

Install, maintain and remove temporary erosion and pollution control devices as required during the construction of the project. B I D I T E M S U N I T S Temporary Berm (Set Price) Linear Foot Temporary Slope Drain Linear Foot Silt Fence Linear Foot Biodegradable Log (***) Linear Foot Synthetic Sediment Barrier Linear Foot Filter Sock (***) Linear Foot Temporary Ditch Check (Rock) Cubic Yard Temporary Inlet Sediment Barrier Each Temporary Sediment Basin Cubic Yard Temporary Stream Crossing Each Sediment Removal (Set Price) Cubic Yard Temporary Fertilizer (**) Pound Temporary Seed (**) Pound Soil Erosion Mix Pound Temporary Seeding Lump Sum Erosion Control (*)(**) Square Yard Mulching (Temporary) Ton Water (Erosion Control) (S et Price) M Gallon Geotextile (Erosion Control) Square Yard * Class ** Type *** Size

902.2MATERIALS

Provide erosion control devices, sediment barriers, fe rtilizers, seeds, soil erosion mix, erosion control materials and mulch that comply with DIVISION 2100. Provide aggregate that complies with aggregate ditch lining, D 50 = 6 inches, DIVISION 1100. Existing aggregate from the project may be used under this specification, provided all applicable physical requirements are met. Provide water for erosion control that complies with DIVISION 2400. Provide geotextile (erosion control) that complies with DIVISION 1700 for separation geotextile. Provide metal pipe, plastic pipe or flexible rubber pipe for temporary slope drains. The Engineer will accept the material for temporary slope drain based on the condition of the pipe and visual inspection of the installed drain.

902.3CONSTRUCTION REQUIREMENTS

work is required, items will be added as provided for in SECTION 104. Use KDOT’s Temporary Erosion Control Manual and standard plan sheets or approved alternate reference documents as a guide for the design, installation and maintenance of temporary erosion and sediment control best management practices (BMPs.). Alternate BMP references include: • EPA – Stormwater Menu of BMP: (http://water.epa.gov/polwaste/npdes/swbmp/Construction-Site-Stormwater-Run-Off-Control.cfm ) • Mn/DOT – Erosion and Sediment Control Pocketbook Guide: –TEMPORARY EROSION AND SEDIMENT CONTROL (http://www.dot.state.mn.us/environment/erosion/pdf/2006mndotecfieldhandbook.pdf) • NDOR – Construction Stormwater Pocket Guide: (http://www.transportation.nebraska.gov/environment/guides/Const-Strmwtr-Pocket%20Guide.pdf) • Additional reference material available on KDOT’s internet website: (http://www.ksdot.org/bureaus/burconsmain/Connections/swppp.asp).

drains. Construct temporary berms as shown in the Contract Documents. Compact the berms until no further consolidation is observed, using a dozer track, grader wheel or other equipment.

backslopes. Construct the temporary slope drains as shown in the Contract Documents.

warrant, supplement the temporary silt fence with a support fence. Reduce the post spacing and drive the posts further in the ground in low and soft, swampy areas. Remove and dispose of sediment deposits when the deposit approaches ⅓ the height of the silt fence. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer.

SWPPP. Remove and dispose of sediment deposits when the deposit approaches ½ the height of the biodegradable log. Do not use straw logs for ditch checks or inlet sediment barriers. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer.

shown in the SWPPP. Remove and dispose of sediment deposits when the deposit approaches ½ the height of the barrier. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer.

for protection of curb and gutter inlets.

SWPPP or the Contract Documents. When deposits reach approximately ½ the height of the temporary rock ditch check, remove and dispose of the accumulated sediment. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer.

SWPPP to construct temporary inlet sediment barriers. Pr efabricated protection devices or alternative systems may be used with the Engineer’s approval. Provide the Engineer with a complete description, literature, test reports, etc. on the proposed system. Submit this information with the SWPPP documents for approval under subsection 901.3.c. When temporary silt fence is used, reduce post spacing and drive the posts further into the ground in low and soft, swampy areas. Remove and dispose of the sediment when deposits reach approximately ⅓ the height of the silt fence. When synthetic sediment barriers are used, remove and dispose of the sediment when deposits reach approximately ½ the height of the barrier. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer. –TEMPORARY EROSION AND SEDIMENT CONTROL

vegetation. Construct the temporary sediment basin with a wide cross-section and a minimum grade, as shown in the Contract Documents. Dispose of excess excavated material. Remove and dispose of the accumulated sediment when deposits reach approximately 20% of the basin capacity. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer.

in the Contract Documents, the Contract or may install the crossing at no cost to KDOT. Comply with all applicable rules and regulations, obtain all required permits and provide copies of all permits to the Field Engineer . An unanticipated stream crossing may require a permit from the Corps of Engineers if work is performed within Waters of the U.S. and/or a stream obstruction permit from the Kansas Department of Agriculture if the crossing is in a designated stream. Before beginning work in the streambed, record existing stream channel elevations. Construct temporary stream crossings as shown in the Contract Documents or the SWPPP. Place 1 pipe buried 6 inches into the stream bottom, in the lowest point of the channel to allow the passage of aquatic organisms, with additiona l pipes placed along the remainder of the stream channel bottom such that ordinary high water (OHW) flows designated in the Contract Documents shall flow through the pipes without overtopping the crossing. If the OHW is not designated in the Contract Documents, the Engineer will determine the OHW. The OHW means that line on the shore established by the fluctuations of water and indicated by physical characteristics such as clear, natural lin e impressed on the bank, shelving, ch anges in the character of the soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas. Submit to the Engineer for review and approval, the design flow calculations to determine the number and diameter of pipes required. A minimum 12 inch diameter pipe is required. Place pipes parallel to flow. Cover pipes with a minimum of 12 inches of clean aggregate fill. Dispose of sediment on the project at locations approved by the Engineer. When necessary, stabilize the material as directed by the Engineer.

blocking the flow of water through the pipes. Perform additional inspections, as needed. Remove drift and debris when blockage occurs. Repair eroded areas, if necessary, to prevent washout and allow passage of flows.

disturbed bed and bank area of the stream channel to its pre-existing elevations.

seeding. Prepare the seedbed, fertilize, seed and mulch according to DIVISION 900. Apply the temporary fertilizer, seed and mulch at the rates shown in the Contract Documents. Apply wate r to seeded and mulched areas when approved by the Stormwater Compliance Engineer or Local Public Authority to promote the establishment of vegetation in critical areas.

rake broadcasted seed before placement of the erosion control. Only use the soil erosion mix under Erosion Control (Class 1) or Erosion Control (Class 2). There are no seasonal placement limitations for the soil erosion mix.

erodible surface. If this item is used: fertilize, seed, and mulch all exposed erodible earth. Prepare the seedbed, fertilize, seed and mulch according to DIVISION 900 . Apply the temporary fertilizer, seed and mulch at the rates shown in the Contract Documents.

manufacturer’s requirements for edge and junction overlaps, staple size and staple pattern. Installation areas shall be free of erosion rills, rocks, clods or other debris that may cause “tenting” or otherwise inhibit uniform contact. –TEMPORARY EROSION AND SEDIMENT CONTROL When shown in the plans, install erosion control materials within the time allowed for temporary stabilization under subsection 901.3b. Use Erosion Control materials for the stabilization of a ll steep slopes (2 ½:1 or steeper) where construction activities have permanently or temporarily ceased and will not resume for a period exceeding 7 calendar days

SWPPP. Do not mulch over the Erosion Control (Class 1).

of concentrated flow according to the SWPPP. Do not cover erosion control materials with soil or mulch unless recommended by the manufacturer and approved by the Engineer. Apply water to completed erosion control installations when approved by the Stormwater Compliance Engineer or Local Public Authority to promote the establishment of vegetation in critical areas.

steep slopes and other areas where timely installation of the permanent (aggregate or concrete) slope protection is impractical. The installation area should be free of rills, ro cks, clods or other debris. Secure geotextile to the ground with staples or other similarly effective methods to achieve uniform contact with minimal “tenting.” Remove geotextile prior to placement of the permanent slope protection. Install geotextile (erosion control) as a temporary m easure to protect temporary slopes, soil stockpiles and other areas where mulching or other means of stabilization is impractical. Preparation of the slopes and the method of securing the fabric shall be as approved by the Engineer.

effectiveness of the temporary erosion and pollution control devices as long as required to contain sediment runoff. Monitor temporary erosion and pollution control devices daily. Remove the temporary devices according to the SWPPP or when directed by the Engineer. After removing the temporary erosion and pollution cont rol devices, remove and dispose of th e silt accumulation. Grade, fertilize, seed and mulch any bare areas. When temporary erosion and pollution control devices are installed according to the Contract Documents, SWPPP, or as approved by the Engineer and such devices are no longer effective b ecause of deterioration or functional incapacity, payment will be made for replacement of these devices, as directed by the Engineer. No payment will be made for replacing temporary erosion control devices that become ineffective because of improper installation, lack of maintenance or the Contractor’s failure to pursue timely installation of permanent erosion control devices according to the Contract Documents.

902.4MEASUREMENT AND PAYMENT

The Engineer will measure temporary berms, temporary slope drains, silt fence, biodegradable logs, synthetic sediment barriers, and filter sock by the linear f oot. The Engineer will measure the top of the device from point to point or each bend/turn in the device, add them together from beginning to end to come up with the total liner feet per device. The length installed up side slopes beyond a point level from the top of the device in the ditch bottom will not be measured for payment. The Engineer will measure temporary rock ditch checks by the cubic yard. The Engineer will measure each te mporary inlet sediment barrier. The Engineer will measure each temporary stream crossing when shown as a bid item in the contract. The Engineer will measure temporary sediment basins by the cubic yard excavated to construct the basin. The Engineer will measure sediment removal by the cubic yard of sediment removed. If the quantity of sediment removal is approximately 50 cubic yards or greater in one location, the Engineer may pay for sediment removal by force account ( SECTION 109) rather than paying the contract set price for the bid item ″Sediment Removal″. Whether paid as a set price or by force account, th e Engineer will not pay for a quantity or cost that is incurred because of the Contractor’s failure to install seed timely or failure to remove sediment timely as SECTION 901 requires. The Engineer will measure temporar y fertilizer, temporary seed and soil erosion mix by the pound. The Engineer will measure "Temporary Seeding" as a lump sum; no measurement of area is made. The Engineer will measure erosion control by the square yard. The Engineer will measure temporary mulching by the ton. –TEMPORARY EROSION AND SEDIMENT CONTROL The Engineer will measure water us ed for establishment of vegetation by the M Gallon using calibrated tanks or meters. The Engineer will measure geotextile (erosion control) by the square yard. Payment for the various items of temporary erosion and pollution control is full compensation for the specified work. Contract unit prices will govern regardless of overruns or underruns of the estimated quantity unless specifically stated otherwise. Payment for "Sediment Removal (Set Price)" at the contract set unit pr ices is full compensation for the specified work. The Engineer will not measure for separate payment any erosion control devices or seeding installed in Contractor-Furnished borrows and waste locations or plant site locations outside the project limits.