209.01 191 SECTION 209 – PROJECT EROSION PREVENTION AND SEDIMENT CONTROL
209.01 Description ................................ ................................ ................... 191
209.02 Classification ................................ ................................ ............... 191
209.03 Reserved ................................ ................................ ....................... 192
209.04 Project Review ................................ ................................ ............. 192
209.05 Preconstruction Conference ................................ ......................... 192
209.06 Construction Requirements ................................ .......................... 193
209.07 Construction of Structures ................................ ........................... 196
209.08 Method of Measurement ................................ .............................. 206
209.09 Basis of Payment ................................ ................................ .......... 207
DESCRIPTION
209.01 Description
This work consists of implementing temporary and permanent best management practices (BMPs) to prevent erosion and control sediment through the use of structural and non-structural controls. Implement erosion prevention and sediment control (EPSC) measures during all phases of construction. Ensure that all EPSC measures shown on the Stormwater Pollution Prevention Plan (SWPPP) are in place before beginning soil distur bing activities. Comply w ith all provisions of the SWPPP, noting that additional EPSC measures beyond those shown in the SWPPP may be needed to maintain compliance with permits.
209.02 Classification
The Department will classify structural and non -structural BMPs according to the manual for Management of Storm Water Discharges Associated with Construction Activities . BMPs are structural and non -structural controls required for the Project. Implement BMPs according to the more restrictive of the TN Const ruction General Permit, the manual for Management of Storm Water Discharges 209.03 192 Associated with Construction Activities , the project SWPPP, and Roadway Standard Drawings .
209.03 Reserved
CONSTRUCTION REQUIREMENTS
209.04 Project Review
At the preconstruction conference, discuss with the Engineer the potential problems with implementing EPSC measures due to construction activities, as well as the actions to be taken to prevent such problems. If the Contractor’s operations and construction staging differ signif icantly from the Project SWPPP, propose modifications to the SWPPP, as specified in 209.05, that do not conflict with the requirements of the TN Construction General Permit, the conditions of any ARAP for the Project, and other environmental permits. Comply with all provisions of the SWPPP during the term of the Contract. If a waste or borrow area is needed, prepare a Waste and Borrow Plan according to the manual Procedures for Providing Offsite Waste and Borrow on TDOT Construct ion Projects .
209.05 Preconstruction Conference
The Department will hold a preconstruction conference for every project. For sites that have environmental permits, the Department will also hold an environmental preconstruction conference. These conferences may be held jointly or separately, as determi ned by the Engineer. At the preconstruction conference, submit for approval a phasing plan that identifies:
1.All areas within the right -of-way designated for clearing and grubbing, grading, bridges and other structures at water courses, paving, and incidental construction activities; and
2.Areas outside the right -of-way that will be disturbed by the construction such as waste and borrow areas (which must have an approved Waste and Borrow Plan and be properly permitted), haul roads, utilities, and st aging areas, and utility work in general. 209.06 193 If the phasing plan requires additional EPSC measures, or modifications to the existing SWPPP, submit these modifications to the Engineer for discussion during the preconstruct ion conference. The modifications sha ll incorporate and supplement, as applicable, t he basic control devices shown on the Plans to provide acceptable temporary and permanent EPSC measures during all stages of construction as well as to comply with all applicable environmental permit condition s. The modifications shall also include controls for managing and stabilizing natural and created steep slope areas as defined in the TN Construction General Permit. Do not begin work until the Engineer has accepted the erosion prevention and sediment co ntrol plan, including the phasing of temporary and permanent erosion control measures. Rejection of all or part of the plan is not a basis for an extension of contract time. Discuss with the Engineer how utilities will be managed on the P roject, specifically whether or no t the utilities are within the c onstruction contract. Coordinate a start date for utilities with the Engineer if utility work will begin before the P roject start date. Unless approved in advance by the Engineer, utilities that are with in the construction contract cannot begin construction on the Project until the Engineer has approved the work. Update the EPSC plan as work progresses to show changes due to revisions in work schedules or sequence of construction, or when directed by the Engineer. Install additional measures in the field as needed to manage erosion and sediment and to prevent pollutants from discharging into waters of the State or off the P roject. The environmental preconstruction conferenc e will include a review of the Project’s environmental permits and all additional environmenta l commitments required for the P roject. This meeting will address the required marking of clearing limits and the marking of sensitive environmental areas in accordance with applicable enviro nmental permits. Discuss potential problems with implementing the requirements of any environmental permits due to construction activities, as well as actions to be taken to prevent conflicts between environmental permits and construction activities.
209.06 Construction Requirements
Mark the disturbed area limits and environmental boundaries in the field before starting construction in each section or portion of the Project. Before or simultaneously with clearing an d grubbing operations, install EPSC devices according to the approved SWPPP. Such work may involve the construction of temporary berms, dams, silt fences, sediment basins, lined 209.06 194 channels, permanent cut -off ditches, slope drains, or other control devices a s necessary to prevent and control erosion. Do not pump water from cofferdams or other dewatering activities directly into streams. Pump such water into sediment basins, traps, or filter bags, or otherwise adequately treat before discharging. Do not st art grading operations until the EPSC devices are in place to the satisfaction of the Engineer. If adequate controls are in place, the Contractor may clear and grub areas to be graded according to the TN Construction General Permit before starting grading operations. Protect stockpiled topsoil or fill material to prevent sediment runoff from contaminating surrounding areas or entering nearby streams. To reduce sediment in runoff, promptly install EPSC structures during all construction phases and maintai n these measures until the areas they are serving have been permanently stabilized. Identify both natural and created steep slope areas as defined in the TN Construction General Permit. Ensure the SWPPP is updated to reflect all steep slope areas. Manage and stabilize steep slopes according to the TN Construction General Permit and other applicable environmental permits. Stage construction operations so that graded or otherwise disturbed erodible surfaces remain protected as the Work progresses. Once sta rted, complete grading of roadway cuts or embankments as a continuous, viable operation to subgrade elevation, unless otherwise approved in writing by the Engineer. As grading operations progress, perform final dressing, place topsoil, and protect exposed erodible cut or embankment slopes with permanent seeding, sodding, matting, or other acceptable EPSC measures in vertical increments not exceeding 25 feet. Do not allow any portion of these slopes to remain unprotected longer than allowed by the TN Const ruction General Permit unless the Engineer determines that weather conditions or other special circumstances prevent prompt placement of permanent control measures. Implement temporary erosion control measures as directed by the Engineer. Perform seeding, sodding, matting, or other acceptable EPSC operations within 48 hours of the occurrence of either of the following:
1.Each 25-foot vertical increment is graded, or
2.Upon suspension or completion of grading operations in a specific area. The above requi rements for progressive erosion prevention and sediment control also apply to graded areas off the right -of-way, such as waste areas, borrow areas, and haul roads. Develop a Borrow and Waste Plan for all waste 209.06 195 or borrow areas selected according to the Sta tewide Storm Water Management Plan and the manual Procedures for Providing Offsite Waste and Borrow on TDOT Construction Projects . Incorporate all permanent EPSC practices into the Project as soon as practicable and in accordance with the TN Construction G eneral Permit. To the extent practicable, coordinate temporary and permanent erosion prevention and sediment control work. Use temporary EPSC features to control erosive conditions before permanent control features can be installed or to temporarily cont rol erosion that develops during construction , but which is not associated with permanent control features on the Project. Perform temporary stabilization of disturbed areas according to the TN Construction General Permit. Where construction activities cr oss or border areas of depression (i.e. , sinkholes without openings or open throats), install and maintain EPSC measures as shown on the Plans and as required by the TN Construction General Permit and all other applicable environmental permits. If construction activities encounter an open throated sinkhole (Class V Injection Well), immediately notify the Engineer and implement the applicable measures as described in the approved SWPPP. Prevent silt or other potential pollutants from entering the sinkhole o pening. Remove temporary EPSC measures when no longer needed or permanent control measures are installed. Any materials removed shall become the property of the Contractor. Inspect EPSC measures on a regular basis. Remove accumulated sediment and maint ain the structural components of the EPSC measures as necessary to ensure that they continue to function properly. Repair EPSC measures damaged by the Contractor’s sediment removal operations at no additional cost to the Department. Upon complete removal of sediment traps, special ditches, and similar structures, restore the area upon which they were constructed by placing topsoil, seed, and mulch, or otherwise stabilizing. If temporary EPSC measures are required due to the Contractor’s negligence, carelessness, or failure to install permanent controls as a part of work as scheduled, and are ordered by the Engineer, perform such work at no additional cost to the Department. If there is a conflict between these requirements, the TN Construction General Per mit, and the laws, rules, or regulations of other Federal, State, or local agencies, adhere to the more restrictive laws, rules, or regulations. 209.07 196 209.07 Construction of Structures Structural controls include, but are not limited to, bonded fiber matrix, riprap, inlet protection, check dams, silt fence, and sediment basins. Install and maintain structural measures according to the manual for Management of Storm Water Discharges Associated with Construction Activities, TN Construction General Permit, and the Roadway Standard Drawings.
A.Sediment Filter Bags The Contractor may use sediment bags on slope drains, pipe culverts, and box bridges, or for pumping sediment from sediment traps and sediment basins. Perform such work as shown on Plans or as directed by the Engineer. Provide filter bags consisting of a non -woven geotextile bag resistant to rot, mildew, puncture, and tearing, and that has a minimum seam breaking strength of 200 pounds. The seams shall demonstrate less elongation and deformation than the geotextile fabr ic. The Division of Materials and Tests will certify the fabric for the Temporary Sediment Filter Bags and place them on the Department’s Qualified Products List. Ensure that each bag has a permanently attached label from the manufacturer designating th e bag’s maximum allowable flow rate in gallons per minute. Do not allow the flow into the filter bag to exceed the designated flow rate. Connect the filter bag to the pump hose as recommended by the manufacturer. Upon P roject completion, remove the sediment filter bag and permanently stabilize the disturbed areas at the dewatering structure location. Dispose of the bag and the sediment contained in the bag as directed by the Engineer.
B.Sandbag Berms and Temporary Plugs The Contractor may use sandbag berms and temporary plugs for velocity control, runoff management, sediment control, and separating streamflow from work areas. Do not use sandbag measures for filtration, in high concentrated flow areas where the bags may be displaced by flow, and in areas where equipment and/or traffic may damage the bags. Place sandbags so that their ends tightly abut and overlap to direct flow away from bag joints. Sandbags for the sandbag berms and channel plugs shall be made of durable, weather resistant geotextile, having tight enough pores to retain 209.07 197 the bag filler material. Use of burlap is not acceptable for sandbags used in sandbag berms and temporary plugs. Typical bags measure approximately 24 inches x 12 inches x 6 inche s. Use clean, non -cohesive sand as fill material for the sandbags. Where sandbags are used to construct sandbag berms or temporary plugs across a ditch or channel, install the sandbags along a level contour. Turn the sandbags at the ends of the measure upstream. The Contractor may install sandbag berms in both unpaved and paved ditches and channels. Construct the sandbag berm to be wider than the high water mark of the ditch or channel to prevent undercutting. The center of the sandbag berm shall be l ower than either of the edges. For multiple sandbag berms installed in ditches, the maximum spacing between the berms should be such that the toe of the upstream sandbag berm is at the same elevation as the top of the downstream sandbag berm. To tempora rily separate stream flow from work areas, construct sandbag temporary plugs as necessary. Construct temporary plugs to prevent leaks between bags. Remove and replace torn or damaged sandbags to prevent the bag filler material from becoming a stormwater p ollutant. Remove any sediment accumulations at sandbags when the sediment accumulation has reached half the original height of the sandbags. If the ends of sandbag structures are breached, place new bags in the breach, and extend the ends of the berm to a higher elevation. If needed, repair the bank damage. If sandbags are undermined, do not repair the sandbags in place as additional undermining may occur. Move the sandbags downstream of the damaged location. Upon Project completion, remove all sandb ags and permanently stabilize disturbed areas underlying the sandbags with measures such as permanent seed and mulch.
C.Flocculants Furnish and apply flocculant materials to control erosion on disturbed areas and for use with sediment con trol devices to reduce turbidity from stormwater runoff.
1.Equipment. If using a liquid application system, it may be necessary to pump a surfactant through the delivery system before 209.07 198 injecting liquid flocculant and afterwards to prevent clogging of pipes and valves. After applying flocculant materials, clean all application equipment according to the flocculant manufacturer’s recommendations to prevent the formation of dried residue that may impede future equipment performance. Apply dry flocculant materi als with a hand -held fertilizer spreader or a tractor -mounted spreader. If approved by the flocculant manufacturer, the Contractor may mix certain dry flocculants with dry silica sand to aid in spreading.
2.Limitations. Do not apply cationic PAM blends. Do not apply flocculants directly to streams, wetlands, or other natural water resources; to sediment ponds; or to slopes that produce runoff directly into a stream, wetland, or other natural water resource. Apply flocculants so that all flocculant -applied runoff flows into a sediment trap, sediment pond, or series of multiple sediment-control BMPs prior to discharge from the site. Always use flocculants for both erosion and sediment control in conjunction with approved stormwater BMPs, as shown on the Stan dard Drawings. Perform dry flocculant applications in dry weather conditions with light winds. Do not apply anionic PAM during rainfall or onto saturated soils. Do not apply flocculants over snow -covered surfaces or over surfaces of pure sand or gravel wi th no fines. Apply flocculants at least 60 feet from any stream, wetland, or other natural water resource located on or adjacent to the construction site. Do not apply emulsion forms of coagulant/flocculants directly to stormwater runoff or to streams, wet lands, or other water resources due to surfactant toxicity. Emulsions may only be used to prepare liquid flocculants specifically used for erosion control applications, such as soil binders and tackifiers.
3.Preparation of Treatment Areas. Before using flo cculants, obtain and test site -specific soil samples to identify the optimum flocculant 209.07 199 blends to use for effectiveness. Obtain soil samples from each soil horizon to be accessed during excavation.
4.Application Requirements. Use flocculants in conjunction with other BMPs (with the bulk of structural sediment -control BMPs, including sediment ponds, positioned down slope of the flocculant - application areas) to increase flocculant performance. Direct stormwater runoff from flocculant -treated soils to pass th rough a series of sediment control BMPs prior to discharge to surface waters, with flow passing through a minimum of three enhanced rock check dams and a silt trap. It is preferable that runoff from flocculant -treated areas be directed into a sediment pon d. Store flocculant materials in cove red areas. Many flocculants demonstrate a decrease in effectiveness after exposure to sunlight and air. Anionic PAM loses its effectiveness within three months after exposure to sunlight and air. Anionic PAM as well as certain other flocculant materials, when combined with water, become very slippery and can produce a safety hazard. Take care to prevent spills of flocculants, in liquid, emulsion, or powder form, onto paved surfaces. Application of flocculants will be most effective when applied as follows:
1.During rough grading operations;
2.On stockpiles and borrow areas;
3.Temporary haul roads before placement of crushed rock surface;
4.Compacted soil road base;
5.After final grading and before paving and/or final seeding;
6.Along the interior surface area of ditches;
7.Sites where work has been temporarily suspended (e.g., winter shutdown), and
8.Areas that will be mulched. 209.07 200 The use of a visible tracer or colorant to visibly track flocculant application is recommended. For liquid applications of flocculants, use source water for mixing with a low turbidity (20 NTUs or less). For turbidity reduction within sediment ponds, apply flocculants to conveyance ditches above the pond that discharge into the p ond. For dewatering and suspended solids removal of turbid pooled water within pipe tranches, silt traps, or other areas, flocculants may be introduced, in either liquid or solid forms, into the turbid water during pumping/evacuation of the pooled water, with the discharge either pumped through a filter bag or jute -lined treatment ditch prior to ultimate discharge. Strictly adhere to the application rates as given in this specification for turbidity reduction for anionic PAM, and as given by the manufactu rers’ requirements for other types of flocculants, during dewatering.
a.Anionic Polyacrylamide. Before using any flocculant, submit the flocculant manufacturer’s written application, storage, and mixing requirements and specifications to the Engineer. Store, handle, mix, and apply anionic PAM in strict accordance with the flocculant manufacturer’s recommendations and in strict compliance with OSHA Material Safety Data Sheet requirements and all applicable Federal, S tate, and local regulations. Use proper personal protective equipment when handling the floccula nt per industry, manufacturer, State, and Federal regulations. Do not exceed the specified maximum application rates for anionic PAM. Applying additional PAM beyond the rates specified will not impro ve the effectiveness of PAM but could present toxicity issues to receiving streams down gradient of the PAM application zone. (1) For Erosion Contr ol Applications on Sloped Areas a) For hydroseeding applications, add anionic PAM as the last component to the hydroseeding mixture. When mixing, never add water to anionic PAM. Add PAM at a slow rate to water. Mixing of anionic PAM 209.07 201 for hydroseeding shall include agitation of the PAM/water mixture. Apply using a method that will ensure uniform flocculant coverage over the target application area. b) Never use anionic PAM as the sole erosion control method for slopes; accompany slope applications of PAM with mulching. c) For PAM tackifiers, dissolve dry PAM with a known quantity of clean water in a container for several hours (preferably overnight). Apply PAM using a hydro - mulch machine at a rate ranging from 0.5 pounds to
1.0 pound (maximum) per 1 ,000 gallons of water per
acre of application area. d) For soil binder applications, dissolve pre -measured dry PAM with a known quantity of clean water in a container for several hours (preferably overnight.) Apply PAM at a rate ranging from 2/3 pounds to 1 pound (maximum) per 1 ,000 gallons of water per acre of bare soil. e) Mix emulsion batches accord ing to the recommendations of the flocculant manufacturer to determine the proper product type and application rate to meet site -specific requirements. Apply using a method that will ensure uniform coverage over the target application area. f) When using an emulsion form of anionic PAM to slopes, apply no greater than 1.5 gallons emulsion per acre per event. Solution mixtures shall be 1.5 gallons (maximum) anionic PAM emulsion per 3 ,000 gallons of water. Do not use water volumes that are less than 3,000 gallons of water due to increased viscosity issues. g) Spray the anionic PAM/water mixture uniformly across the dry soil slope until completely wetted. h) For dry anionic PAM applications for erosion control, apply anionic PAM as a powder at the following rates: 209.07 202 • For slopes less than 25%, apply at a maximum rate of 10 pounds per acre • For slopes greater than or equal to 25%, apply at a maximum rate of 20 pounds per acre i) Reapply liquid anionic PAM for erosion control on actively worked areas after a 48 -hour period. j) Do not apply liquid anionic PAM to the same slope area more than once in a 48 -hour period and no more than seven times in a 30 -day period. k) For inactive s lope areas where anionic PAM has been applied, reapply once every two months. l) Anionic PAM applications (dry or liquid) shall not exceed 200 pounds per acre per year. (2) For Turbidity Reduction within Ditches a) If possible, apply flocculant as erosion control in the watershed above the treatment ditches in conjunction with the application of flocculants within treatment ditches for turbidity control. b) Line the surface area of stormwater ditches, as well as the surface area of ditch check dams, with j ute mesh. c) Apply dry powder anionic PAM over the jute mesh at a rate of 0.25 pounds to 0.5 pounds per 1 ,000 square feet of ditch surface area. d) Reapply dry powder anionic PAM to jute mesh in ditches every three to five storm events. Dry anionic PAM application shall not exceed 4.6 pounds per 1,000 square feet per year. e) Ensure anionic PAM bricks/logs are of appropriate size, shape, and number to deliver the appropriate dosage to the water within the conveyance. Obtain brick/log dissolution rates and dosages from the flocculant manufacturer. 209.07 203 f) Locate anionic PAM bricks/logs in a shaded, preferably moist, installation zone during application. g) Place anionic PAM bricks/logs near the main flow area of the ditch, at an appropriate distance above sediment ponds or traps to maximize mixing and flocculation. Refer to the manufacturer’s guidance for flocculant mixing time and block/log spacing configurations. h) Install one anionic PAM brick/log for every 65 to 70 gallons per minute of flow to be trea ted, unless otherwise specified by the flocculant manufacturer. i) Unless otherwise specified by the flocculant manufacturer, anionic PAM bricks/logs are estimated to treat, on average, 475,000 to 550,000 total gallons of flow volume. j) Install stakes, me sh bags, cages, and other mechanisms to anchor bricks/logs in place to provide stability during flows and to maximize exposure of the brick/log surface area to flows. k) Replace anionic PAM bricks/logs at least every 3 to 4 months or earlier if bricks/logs have excessive sediment/debris deposition on the outer brick/log surface area or excessive degradation of brick/log mass.
b.Miscellaneous Coagulants/ Flocculant s. Miscellaneous flocculant materials shall include all other flocculants that are not polyacyla mide blends and that hav e been pre -approved for use on Department projects through the Materials and Testing Division. Before using any flocculant, submit the manufacturer’s written application, storage, and mixing requirements and specifications to the E ngineer. Store, handle, mix, and apply flocculants in strict accordance with the flocculant manufacturer’s recommendations and in strict compliance with OSHA Material Safety Data Sheet 209.07 204 requirements and all applicable Federal, S tate, and local regulations. Use proper personal protective equipment when handling the floccula nt per industry, manufacturer, State, and Federal regulations. Do not exceed the manufacturer’s specified application rates for flocculants. For erosion and sediment control applications for sloped areas and ditches:
1.Strictly follow the manufacturer’s requirements for application mixtures and rates.
2.With hydroseeding applications, mix flocculants according to the manufacturer’s written recommendations.
3.Do not use flocculants as the sole erosion control method for slopes; accompany slope applications of flocculants with mulching. Use flocculant for turbidity reduction in ditches in conjunction with other structural sediment - control BMPs.
4.Re-application frequency and rates sha ll strictly follow the manufacturer’s written recommendations, as provided to the Department and the Contractor.
5.Store flocculants according to the manufacturer’s written requirements, as provided to the Department and the Contractor.
5.Documentation and Maintenance. Flocculants will enhance the deposition of soil solids in downstream ditches, pipes, and ponds. Inspect these hydraulic structures regularly, and routinely remove solids from these structures to ensure optimization of perfo rmance. Provide suitable means for storing and protecting flocculants against moisture and sunlight. Department field personnel will maintain records of all flocculant applications including the following information: 209.07 205 a) Date, time, and specific location o f application; b) Rates of application; c) Method of application; d) Weather conditions, and e) Type of flocculant applied including manufacturer name and product name.
6.Final Cleanup. Clean liquid or dry flocculant spills according to the manufacturer’s r equirements. Thoroughly rinse flocculant mixing and application equipment with water to prevent residue formation. The Contractor may apply rinse residues to exposed slopes for erosion control. Keep the amount of unused flocculant mixtures to a minimum. Dispose of excess floccula nt material in compliance with Federal, S tate, and local environmental regulations. Do not dispose of excess material within stormwater conveyances, sewers, or streams. Where temporary erosion prevention and sediment control or pollution prevention work is acceptably performed and failure of all or any part of the system occurs but is not attributed to the Contractor's negligence, carelessness, or failure to install permanent controls and falls within the specifications for a wo rk item that has a contract price, the Department will pay for units of work at the proper contract prices except as noted below. Should the temporary EPSC work not be comparable to the project work under the applicable contract items, the Department will direct the Contractor to perform the work on a force account basis, or by agreed unit prices as specified in 109.04. Except as noted below, the Department may pay the Contractor to replace temporary EPSC measures installed acco rding to the Plans or as approved by the Engineer provided such devices are no longer effective due to deterioration or functional incapacity that is not attributable to improper installation, lack of reasonable maintenance, or failure of the Contractor to pursue timely installation of permanent control devices according to the Plans and Specifications or as directed by the Engineer. Unless provided for on the Plans, the Department will not directly pay for temporary and permanent EPSC measures in disturbe d areas outside the right-of-way, such as borrow areas, waste areas, and haul roads, unless the 209.08 206 borrow areas or waste areas are provided for by the Department, and except for permanent Seeding (with Mulch) on borrow areas and waste areas within the limitat ions specified in 203.04.E and 203.07, respectively. Where the Plans show separate quantities for erosion prevention and sediment control or pollution prevention items to be used outside the right -of-way in connection with waste areas, borrow areas or other project related construction, the Department will pay for the items used and accepted up to the plan quantities; but the cost of any overruns in these items, or the cost of any additional items req uired for erosion prevention and sediment control or pollution prevention off the right -of-way, shall be borne by the Contractor unless prior written approval is received from the Engineer. If the Contractor fails to control project related erosion or the discharge of pollutants, either on or off the right -of-way, the Engineer may withhold payment of future progress estimates until the Contractor has satisfactorily performed the necessary corrective measures. If deemed necessary, the Engineer may employ ou tside assistance or use Department forces to provide the needed protective measures, and will charge all incurred direct costs plus project engineering costs to the Contractor by appropriate deductions from the Contractor's monthly progress estimate. COMPENSATION
209.08 Method of Measurement
The Department will measure EPSC measures according to the appropriate Standard Drawing or as specified below. The Department will measure:
1.Temporary seeding and mulching operations in accordance with the appropria te provisions of 801.09.
2.Seeding (without Mulch) and Crown vetch mixture (without Mulch) per unit.
3.Accepted quantities of Road and Drainage Excavation by the cubic yard.
4.Sediment removal and disposal for maintaining eros ion prevention and sediment control measures by the cubic yard. 209.09 207 5. Sandbags by the square foot area of berm face.
6.Flocculants used for turbidity reduction by the actual weight in pounds of flocculant materials applied, or, for brick or log forms of flocculant material, by the unit, per each.
7.Flocculants used as either a soil binder or tackifier for erosion control applications by the acre.
209.09 Basis of Payment
The Department will not make separate payment for Non -Structural BMPs. The Department will pay for accepted quantities of EPSC measures based on the item numbers and measurement and payment information provided on the Standard Drawings. Unless otherwis e stated on the corresponding Standard Drawings, payment for EPSC measures is full compensation for all materials and labor necessary to construct, maintain, and remove the measures. For catch basin filter assemblies, structure maintenance including cleani ng to prevent clogging is included in the contract unit price for the structure. The Department will not directly pay for sediment removal and disposal for maintaining these assemblies. The Department will pay for Seeding (with Mulch), Seeding (without Mulch), Temporary Seeding (with Mulch) Crown vetch mixture (without Mulch), and Mulch items in accordance with 801.10. The Department will pay for accepted quantities of Road and Drainage Excavation at the contract unit price per c ubic yard. Unless otherwise specified, the Department will pay for sediment removal and disposal for maintaining EPSC measures at the contract unit price per cubic yard. The Department will pay for rock used for inlet and outlet control on EPSC measures at the contract unit price per ton. The Department will pay for pipe used to construct EPSC measures in accordance with 607.13. 209.09 208 The Department will pay for concrete used to construct spillways or other sediment control structures i n accordance with 703. The Department will pay for water used to prepare the seed bed and for maintenance at the contract unit price per M.G. (1,000 gallons ) of water. The Department will pay for sandbags at the contract unit price per bag. The Department will pay for accepted quantities of flocculants at the contract unit price. Such payment is full compensation for all equipment, materials, labor, and incidentals necessary to apply the flocculant materials. The Department w ill pay for sediment filter bags at the contract unit price for the size bag used. Such payment includes installation and replacement as needed, along with all materials, equipment, tools, labor, and incidentals to complete the work. The Department will pay for removal and disposal of material from bag by the cubic yard at the contract unit price for sediment removal.
Part 3
209 PART 3 – BASE AND SUBGRADE TREATMENTS SECTION 302 – SUBGRADE TREATMENT (LIME) ........................... 210 SECTION 303 – MINERAL AGGREGATE BASE ................................ 220 SECTION 304 – SOIL-CEMENT BASE ................................ ................. 230 SECTION 306 – PORTLAND CEMENT CONCRETE BASE ............... 238 SECTION 307 – BITUMINOUS PLANT MIX BASE (HOT MIX) ........ 242 SECTION 309 – AGGREGATE -CEMENT BASE COURSE ................. 252 SECTION 310 – CONDITIONING MINERAL AGGREGATE BASE .. 259 SECTION 312 – AGGREGATE -LIME-FLY ASH STABILIZED BASE COURSE ................................ ................................ .......... 262 SECTION 313 – TREATED PERMEABLE BASE ................................ . 270 302.01 210 SECTION 302 – SUBGRADE TREATMENT (LIME)
302.01 De scription ................................ ................................ ................... 210
302.02 Reserved ................................ ................................ ....................... 210
302.03 Material s ................................ ................................ ...................... 210
302.04 Equipment ................................ ................................ .................... 211
302.05 Limitations ................................ ................................ ................... 212
302.06 Preparing the Existing Subgrade ................................ .................. 212
302.07 Extra Depth Stabilization ................................ ............................. 213
302.08 Applying Lime ................................ ................................ ............. 213
302.09 Initial Mixing and Mellowing ................................ ...................... 214
302.10 Final Mixing ................................ ................................ ................. 214
302.11 Compaction and Finishing ................................ ........................... 215
302.12 Curing ................................ ................................ .......................... 216
302.13 Tolerances and Reconstruction ................................ .................... 216
302.14 Method of Measurement ................................ .............................. 217
302.15 Basis of Payment ................................ ................................ .......... 219
DESCRIPTION
302.01 Description
This work consists of treating in -place subgrade material with lime, and includes preparing the existing subgrade, distributing the specified percentage of lime, initial mixing, mellowing, final mixing, compacting, finishing, and curing.
302.02 Reserved
MATERIALS
302.03 Materials
A.Lime Provide either hydrated lime or quicklime meeting 921.04.
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 200–218 of 1,072.