645EROSION CONTROL

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1Erosion Control Products. This work shall consist of furnishing and placing hay mulch, bark mulch, “ Rolled Erosion

Control Products” (RECP), or other material, to provide soil stabilization and/or erosion control on slopes or in channels at locations shown on the plans or where ordered. 1.1.1 Temporary Slope Stabilization Type A shall be a temporary, photodegradable or biodegradable RECP specified for protection of slopes of 3:1 or flatter. This material m ay also be specified for temporary protection of channels expected to experience flow-induced shear of 1.5 lbs/ft² or less. These products shall maintain their functional integrity for a minimum of 12 months and then degrade. 1.1.2 Temporary Slope Stabilization Type B (Wildlife friendly) shall be a temporary, biodegradable RECP specified for protection of slopes of 3:1 or flatter in areas where wildlife ensnarement is a concern. This material may also be specified for temporary protection of channels expec ted to experience flow-induced shear of 1.5 lbs/ft² or less. These products shall maintain their functional integrity for a minimum of 12 months and then biodegrade. 1.1.3 Temporary Slope Stabilization Type C shall be a temporary, photodegradable or biodegradable RECP specified for protection of slopes of 1½:1 or flatter. This material may also be specified for temporary protection of channels expected t o experience flow-induced shear of 2.0 lbs/ft² or less. These products shall maintain their functional integrity for a minimum of 12 months and then degrade. 1.1.4 Temporary Slope Stabilization Type D (Wildlife friendly) shall be shall be a temporary, biodegradable RECP specified for protection of slopes of 1½:1 or flatter in areas where wildlife ensnareme nt is a concern. This material may also be specified for temporary protection of channels expected to experience flow -induced shear of 2.0 lbs/ft² or less. These products shall maintain their functional integrity for a minimum of 12 months and then biodegrade. 1.1.5 Permanent Channel Stabilization Type A shall be a permanent “ Turf Reinforcement Mat ” (TRM) specified for permanent protection of channels or ditches that are expected to experience flow-induced shear of 3.0 lbs/ft² or less. 1.1.6 Permanent Channel Stabilization Type B shall be a permanent TRM specified for permanent protection of channels or ditches that are expected to experience flow-induced shear of 5.0 lbs/ft² or less.

1.2Storm Water Pollution Prevention Plan (SWPPP). This work shall consist of a temporary erosion and sediment control

and storm water management plan, hereinafter called the Storm Water Pollution Prevention Plan or “ SWPPP”. The work includes all necessary preparations for submissions and revisions of the SWPPP to obtain approval by the Department. This work shall also include monitoring the approved SWPPP during all phases of construction. 1.2.1 The Department will furnish the following data to the Contractor: • Specific reproducible plan sheets and cross-sections of the project, as requested. • Drainage calculations and plans (drainage area size and characteristics; runoff volume; type, size, and slope of pipes; invert elevations; and outlet velocities), as available. • Geotechnical Report including soil boring logs, soil types, and test pit data, as available. • Permits and certifications obtained for the project. • A list of environmental commitments. • A copy of the NHDOT’s Notice of Intent application. • A copy of the NHDOT’s Acknowledgement letter from EPA. • Documentation of permit eligibility related to federally listed threatened and endangered species . • NHDES Wetlands Permit “ Plan of Record”. 1.2.2 Recommended guides for the preparation of the SWPPP are the National Pollutant Discharge Elimination System

Volume III, Guidelines for Erosion and Sediment Control in Highway Construction, available from the American Association of State Highway and Transportation Officials, Inc., 444 North Capitol St. N.W., Suite 249, Washington, D.C. 20001; the New Hampshire Stormwater Management Manual, Volume 3, Construction Phase Erosion and Sediment Controls available from the New Hampshire D epartment of Environmental Services (NHDES) Public Information and Permitting Office, PO Box 95, 6 Hazen Drive, Concord, NH 03302 -0095, Telephone (603) 271- 2975 and the Rockingham County Conservation District in Exeter, NH, Telephone (603) 772-4385; the N HDOT Guidelines for Temporary Erosion and Sediment Control and Stormwater Management (May 2002). 1.2.3 The SWPPP shall be consistent with the provisions of 107.01. New Hampshire Department of Transportation Standard Specifications – 2016 Materials

2.1Mulch

2.1.1 Hay mulch shall consist of cured hay, free from noxious weeds incl uding prohibited invasive pl ants listed in Table 3800.1 of Part AGR 3800 and rough or woody materials. 2.1.2 Bark mulch shall be bark chippings graded to be approx imately 3/8 to 2” in width. The chippings shall not have been stored so long and under such conditions that the material has decomposed sufficiently so that it has lost its fibrous texture. Bark mulch must be approved as to grading and condition prior to its use. 2.1.3 Temporary mulches shall be hay, straw, fiber mats, netting, wood cellulose, b ark, chips, or other approved material. The mulch shall be reasonably clean and free of noxious weeds and materials toxic to plant growth.

2.2Slope and channel stabilization products of the type specified shall be a Rolled Erosion Control Product (RECP) that is listed

on the Qualified Products List.

2.3Staples for soil stabilization material matting shall be those specified by the manufacturer.

2.4Grass seed for erosion control shall be one of the following:

providing a temporary cover which will not compete with the grasses subsequently sown for permanent cover.

2.5Hay bales for erosion control shall consist of rectangular shaped bales of hay or straw weighing at least 40 lb. per bale. They

shall be free from weed seeds and viable parts of prohibited invasive plants listed in Table 3800.1 of pPart AGR 3800and rough or woody materials.

2.6Tackifiers shall be as included on the Qualified Products List.

2.7Geotextile filter fabric for silt fence shall be made from polypropylene, polyester, or other approved polymeric chemically

stable material and resistant to ultraviolet radiation degradation for at least 12 months. Silt retention capacity shall be no less than 75 percent of silt and suspended solids. The fabric shall meet the following requirements. Fabric Property Test Method Property Requirement* Grab Tensile Strength (lbs) ASTM D 4632 100 Minimum Grab Tensile Elongation (%) ASTM D 4632 25 Maximum Puncture Strength (lbs) ASTM D 4833 60 Minimum Mullen Burst Strength (psi) ASTM D 3786 210 Minimum Trapezoid Tear Strength (lbs) ASTM D 4533 60 Minimum *All properties are minimum or maximum average roll values (i.e. the test results for any sampled roll in a lot shall meet or exceed the minimum values or be less than or meet the maximum value in the table.)

2.8Posts for silt fence shall be either wood or steel. Wood posts shall be sound quality hardwood with a minimum cross sectional

area of 1.6 sq. in. Steel post shall be standard T or U section weighing not less than 1 pound per linear ft. with projections for fastening wire to the fence. Maximum post spacing shall be 10 ft.

2.9Support fence for silt fence, if required, shall be a minimum of 14.5 gauge woven wire with a maximum 6” mesh.

2.10Erosion stone shall meet the requirements for Item 585.4 Class D stone.

2.11Erosion Control Mix

2.11.1 Erosion control mix shall be placed to provide for temporary control of erosion or sedimentation, i ncluding slope stabilization, check dams and berms, inlet control or where ordered. 2.11.2 The mix shall have an organic portion between 25% and 65%, dry weight basis, and be fibrous and elongated such as from shredded bark, stump grindings, composted bark, or equivalent manufactured products. The mix shall not contain silts, clays, or fine sands. 2.11.3 The mix shall have a pH between 5.0 and 8.0 and a particle size by weight of 100% passing a 3 -inch screen, 90% to 100% passing a 1-inch screen, 70% to 100% passing a 0.75-inch screen, and 30% to 75% passing a 0.25-inch screen. New Hampshire Department of Transportation Standard Specifications – 2016 Construction Requirements

3.1General

3.1.1 Prior to the start of any land disturbance activities, the Contractor shall submit four sets of the Storm Water Pollution Prevention Plan (SWPPP) described in 3.2 for approval in accordance with 105.02 for clearing, grubbing, grading, drainage and bridge structures, especially in or adjacent to existing waters , water courses and wetlands. The Department’s review time will be proportional to the complexity of the SWPPP and will be within 15 working days. No work requiring erosion/ sediment control shall commence until the SWPPP has been approved. Names of designated personnel to perform field monitoring shall be included in the submittal. The SWPPP may be submitted in phases or for specific construction areas addressing the maximum open area allowed in section 3.1.4. Only work within areas covered by an approved SWPPP will be allowed to be performed. 3.1.1.1 The Department will secure the necessary NHDES Wetlands or US Army Corps of Engineers permit(s) to accomplish the work indicated on the plans. The Contractor is responsible for obtaining additional Wetlands or Corps of Engineers permit(s) for the Contractor’s method of construction. 3.1.2 Permanent and temporary erosion control features shall be incorporated into the project at the earliest practicable time, as specified on the plans, as stated in 107.01, and as outlined in the approved SWPPP. Temporary erosion and sediment control measures shall be used to correct conditions that develop during construction to temporarily control erosion not associated w ith permanent control features. 3.1.3 When erosion is likely to be a problem, grubbing operations shall be so scheduled and performed that grading operations and permanent erosion control features can follow immediately thereafter. 3.1.4 The maximum amount of allowed disturbed earth material exposed shall not exceed a total of 5 acres for all operations within the right-of-way at any one time. The Contractor may be permitted to exceed the maximum open area allowed, with approval from the Department, provided the Contractor's SWPPP shows adequate provisions to control erosion and sediment, provided the additional area of disturbance is necessary to meet the Contractors Critical Path Method schedule (CPM), and the Contractor can demonstrate there are adequate resources available (equipment & manpower) to respond to multiple events simultaneously. In addition, the SWPPP shall show stabilization procedures for any areas that are inactive for more than fourteen days. The SWPPP shall identify when exposed material will be protected from erosion and when temporary and permanent erosion control measures will be installed. 3.1.5 For the construction period from November 30 th through May 1st the area of exposed, unstablized soil shall be limited to one acre. The allowable area of exposed soil may be increased provided a winter construction plan shows adequate pr ovisions to control erosion and sediment, provided the additional area of disturbance is necessary to meet the Contractors Critical Path Method schedule (CPM), and the Contractor can demonstrate there are adequate resources available (equipment & manpower) to respond to multiple events simultaneously and is reviewed and approved by the Department. 3.1.6 The Engineer will limit the area of clearing, grubbing, excavation, borrow and embankment operations commensurate with the Contractor's capability and progress and in no case shall exceed a total of 5 acres without prior approval , in keeping the finish grading, mulching, seeding, erosion and sediment control measures concurrent with operations in accordance with the accepted SWPPP. 3.1.7 Earth excavation and embankment slopes shall be permanently or temporarily treated for stabilization before the time the slant height of exposed slopes reaches 30 ft. , unless otherwise approved. Where construction activities are completed within the growing season, all exposed soil areas shall be permanently stabilized within 3 calendar days. Where construction activities are temporarily suspended or completed outside of the growing season, all exposed soil areas shall be treated for stabilizati on within 14 calendar days. 3.1.8 An area shall be considered “ stabilized” when it is in a condition in which the soils on the site will not erode under the conditions of a 10-year storm. 3.1.9 As work progresses, patch seeding and mulching shall be done as required on areas previously treated to maintain or establish protective cover. 3.1.10 Drainage pipes and ditches shall be constructed in a sequence from outlet to inlet in order to stabilize outlet areas and ditches before water is directed to the new installation or any portion ther eof unless conditions unique to the location warrant an alternative method. If this unique condition exists, the alternative method will require written approval. 3.1.11 Channel and ditch work, including erosion protection shall be completed before diverting the drainage to these areas. 3.1.12 In the event of conflict between these requirements and erosion and sediment control laws, rules or regulations of other Federal, State or local agencies, the more restrictive laws, rules or regulations shall apply. New Hampshire Department of Transportation Standard Specifications – 2016 3.1.13 In case of failure on the part of the Contractor to provide and maintain effective temporary erosion and sediment control, as determined by the Engineer, the Department reserves the right to employ outside assistance or to use its own forces to pro vide the necessary corrective measures.

3.2Storm Water Pollution Prevention Plan. (SWPPP)

3.2.1 This Item addresses the preparation and implementation of a SWPPP required by the National Pollutant Discharge Elimination System (NPDES) and applicable Constr uction General Permit (CGP). The SWPPP shall be prepared, stamped and signed by a Licensed Professional Engineer registered in the State of New Hampshire, and a Certified Professional Erosion and Sediment Control Specialist (CPESC), qualified to prepare erosion and sediment control plans, hereinafter called the “ Preparer”. Collaboration with other professionals such as soil scientists, geologists and environmentalists may be required as appropria te. 3.2.1.1 Qualifications for the SWPPP Preparer include a minimum of 5 years’ experience or knowledge of highway and bridge construction operations, with knowledge of methods of construction, demonstrated knowledge of erosion and sediment control, and stormwater management measures. The preparer shall have prev iously submitted accepted plans to the New Hampshire Department of Environmental Services (NHDES) under RSA 485-A:17 Terrain Alteration, or have prepared accepted plans under the National Pollutant Discharge Elimination System permit program. 3.2.1.2 The Preparer may monitor the SWPPP or designate a representative to monitor the SWPPP. If the Preparer chooses to utilize a representative, t he SWPPP Monitor shall be certified as a Certified Erosion Sediment and Storm Water Inspector

effectiveness, and maintenance requirements. 3.2.1.3 The Contractor shall submit the name and qualifications of the person or firm proposed to prepare the SWPPP to the Engineer for approval prior to preparing the SWPPP. Submittal of the name and qualifications will be accepted after the opening of bids. 3.2.2 The Construction General Permit (CGP) also requires the preparation and implementation of a SWPPP in a ccordance with the afore mentioned statutes and regulations. The SWPPP will include the CGP conditions and detailed descriptions of controls of erosion and sedimentation to be implemented during construction. It is the responsibility of the Contractor to prepare the SWPPP to meet the requirements of the most recently issued CGP. The Contractor shall submit the SWPPP to the Engineer for approval prior to any soil disturbance activities. It is the responsibility of the Contractor to be familiar with the CGP conditions and the conditions of any state Wetlands permit, Water Quality Certification, Corps of Engineers Section 404 Permit and other state and federal environmental permits applicable to this project and to include in the SWPPP the means and methods necessary to comply with applicable conditions of said permits. It is the responsibility of the Contractor to complete the SWPPP in accordance with the EPA Construction General Permit, provide all information required, and obtain any and all certifications as required by the Construction General Permit. Any amendments to the SWPPP required by site conditions, schedule changes, revised work, construction methodologies, and the like are the responsibility of the Contractor. Amendments will require the approval of the Engineer prior to implementation. The Contractor is responsible for preparation of the SWPPP, all SWPPP certifications, inspections, reports and any and all corrective actions necessary to comply with the provisions of the CGP. 3.2.2.1 A sched ule of construction phasing, including maximum open area allowed, and a schedule for monitoring and maintaining the SWPPP shall also be included. BMP’s for seasonal (i.e. cold weather/frozen ground, from November 30 th through May 1st) applications shall b e identified. The construction phasing shall address the various erosion and sediment control and storm water management measures to be implemented at each phase of construction. Phases shall be as shown on the Traffic Control Plan, Prosecution of Work, or as required by the Contractor's approved construction sequence plan. 3.2.2.2 Turbidity limitations in receiving waters noted in 107.01 shall be addressed in the SWPPP. 3.2.2.3 Department plan drawings will show the construction site(s) conditions prior to and after construction by including property lines, right-of-way lines, easements, existing and new structures, drainage, flood plains, wetlands, limits of clearing and grading, proposed final drainage, detours, permanent erosion and sediment control me asures, and other critical items. The Contractor's plan drawings shall show temporary drainage and erosion and sediment control measures for the construction site(s) on the Contract plans provided by the Department. Additionally, the Contractor shall provide plans showing all of the above items for proposed areas related to the construction site(s) not shown on the Department's Contract plans, including but not limite d to, access and haul roads, equipment and material storage sites, material pits, material processing sites, and disposal areas, except municipally authorized landfill areas and commercial sites. Waste materials are quite often materials unsuitable for embankm ent construction and generally very susceptible to erosion; therefore, the Contractor shall pay close attention to controlling erosion of these materials. 3.2.2.4 Additional design typicals illustrating practices for erosion and sediment control not shown on the Department plans shall be included in the SWPPP. Calculations shall be inclu ded to verify all erosion and sediment control and stormwater New Hampshire Department of Transportation Standard Specifications – 2016 management practices such as, but not limited to, sediment retention and detention basins, energy dissipaters, diversions, waterways, and control of runoff. 3.2.3 The Preparer or the Preparer's designated representative shall assist the Contractor in implementing the SWPPP, monitor the site for compliance with the SWPPP and recommend modifications to the SWPPP for changing operations or inadequate erosion and sediment control and stormwater manag ement measures and shall attend weekly (or as required by the Engineer) meetings. The Preparer shall make modifications to the SWPPP as necessary and resubmit for review and approval in accordance with 3.1.1. Review time of modifications will be within 10 working days of submittal. 3.2.3.1 Monitoring SWPPP and Erosion and Sediment Control shall include on -site reviews, weekly (at least once every 7 days) and within 24 hours after any storm event greater than 0.25 ” of rain per 24 hour period and producing meeting minutes of the weekly meetings for distribution as required. A monitoring report prepared by the SWPPP Monitor shall include the following: • inspection date • name • title • qualifications and signature of person performing the inspection • weather information for the period since the last inspection • weather information at the time of inspection • list of site deficiencies or non-compliance issues • locations and description of any discharges • a summary of construction activities undertaken during the reporting period • general site conditions • erosion control maintenance and corrective actions taken • the anticipated schedule of construction activities for the next reporting period • any SWPPP amendments • representative photographs The weekly on-site review shall be conducted only when the Contractor ’s personnel are on site. Should any deficiencies or non-compliance issues be found, corrective action shall be performed in accordance with the USEPA and Construction General Permit (CGP). The SWPPP Monitor shall report any deficiencies or non-compliant issues to the Contractor and Engineer prior to exiting the site. Within 24 hours of completing the on-site review, the SWPPP Monitor shall provide a formal written copy of the monitoring report to the Engineer to be maintained on file with the SWPPP at the project site. 3.2.3.2 The Engineer may order modifications to the SWPPP for changing operations or for inadequate erosion and sediment control and stormwater management measures. Changes and/or modifications shall be noted by the SWPPP Preparer on the approved SWPPP located at the project site. 3.2.3.3 The Preparer of the SWPPP shall be available for on-site consultations with the Engineer within 24 hours of request. 3.2.4 Project work may be suspended, wholly or in part, with no extension of time or additional compensation for failure to implement and maintain the approved SWPPP, including modifications, in accordance with 105.01.

3.3Mulch

3.3.1 Mulching shall be done immediately after each area has been properly prepared. When seed for erosion control is sown prior to placing the mulch, the mulch shall be placed on the seeded areas within 48 hours after seeding. Hay that has been thoroughly fluffed shall be applied at approximately, but not to exceed 3 tons per acre unless otherwise ordered. Blowing chopped hay mulch will be permitted provided the Contractor controls the mulching operation so as not to infringe on property owners or the traveling public. Hay mulch shall be applied in such a manner that results i n a minimum amount of matting that would not retard the vegetative growth. Hay mulch should cover the ground enough to shade it, but the mulch should not be so thick as to cover the ground completely. Matted or bunches of mulch shall be removed or otherw ise remedied. 3.3.1.1 Temporary mulching shall be done on areas that are disturbed per 3.1.6. Hay shall be applied at a minimum of 3.2 tons per a cre unless otherwise ordered. Blowing chopped hay mulch will be permitted provided the Contractor controls th e mulching operation so as not to infringe on property owners or the traveling public. Tackifiers shall be utilized with tempo rary mulch. 3.3.2 In order to prevent mulch from being blown away, a light covering of loose branches or approved tackifier shall be employed. Unless otherwise ordered, loose branches shall be removed prior to Acceptance of the Work. 3.3.3 All baling wire or rope, such as that used in the shipment of mulch shall be disposed of outside the limits of the project in approved areas. New Hampshire Department of Transportation Standard Specifications – 2016 3.3.4 Bark mulch shall be placed on the designated areas to the depth specified on the plans or as ordered. 3.3.5 On areas treated with bark mulch, the Contractor shall remove weeds and plant material as directed.

3.4Rolled Erosion Control Products (RECP)

3.4.1 Rolled Erosion Control Products (RECP), of the type specified, shall be installed where shown on the plans or as directed by the Engineer. 3.4.2 RECPs for slope and channel stabilization shall be installed as per the manufacturer’s recommendations for the specific application and site conditions, or as directed by the Engineer. Documentation from the manufacturer describing recommended installation procedures shall be provided to the Engineer at least 10 working days prior to installation. 3.4.3 Surfaces of ditches and slopes to receive RECPs shall conform to the grades and cross sections shown on the plans and shall be finished to a smooth and even condition with all debris, roots, stones, and lumps raked out and removed. Unless otherwise directed, soil shall be prepared, including the application of lime, fertilizer and seed, prior to installation of the specified type of RECP. 3.4.4 The RECP shall be placed so that is in intimate contact with the soil surface over the entire installation. Site conditions may require the use of additional staples to assure that this contact is maintained. The RECP shall not be stretched. 3.4.5 RECPs shall be buried at the top of slope and around the edges of catch basins and other structures or obstructions as recommended by the manufacturer. 3.4.6 In the event that the RECP installation becomes damaged, undermined, or raised off of the soil surface by vegetation, it shall be repaired immediately as per manufacturer’s recommendations.

3.5Seed for Erosion Control.

3.5.1 Seeding, when required, shall be performed as ordered and in accordance with 644.3. 3.5.1.1 Areas of the roadside which are to be left temporarily and which will be regraded or otherwise disturbed later during construction may be ordered to be see ded with ryegrass to temporarily stabilize the area. The seed shall be sown at the rate of approximately 1 pound per 1,000 square feet.

3.6Hay bales for erosion control. Hay bales shall be placed when ordered to provide for temporary control of erosion and/or

sediment control and secured with two (2) hardwood stakes. Bales shall be removed or left in place as ordered.

3.7Silt Fence.

3.7.1 Install and remove the silt fence as shown on the plans and as recommended by the manufacturer. 3.7.1.1 When two sections of silt fence adjoin each other, they shall be overlapped by 6”, folded, and stapled at a post. 3.7.1.2 Support fence, when required, shall be fastened securely to the fence posts with staples or wire ties. 3.7.1.3 Filter fabric shall be fastened to the support fence, when support fence is required, with ties spaced every 2 ft. longitudinally at the top, mid-section, and bottom. 3.7.1.4 Silt fence shall be embedded a minimum of 6”. 3.7.2 Care shall be taken to maintain the silt fence in a functional condition at all times during the construction period. 3.7.2.1 Silt fences shall be inspected immediately after each rainfall event and at least daily during prolonged rainfall. All deficiencies shall be immediately corrected. 3.7.2.2 Sediment deposits shall be inspected after every storm event and removed when deposits reach approximately 1/3 the height of the silt fence, or when “ bulges” develop in the silt fence. 3.7.2.3 Silt fence fabric which has decomposed, has become ineffective or does not retain silt or suspended solids and is still needed, shall be replaced immediately. 3.7.3 Remove the silt fence, support stakes and support fence after all work has been completed and it is no longer needed or as ordered. 3.7.3.1 Sediment deposits shall be remo ved or left in place, if approved. After the silt fence has been removed, sediment deposits allowed to be left in place shall be graded to conform with the existing topography and shall be vegetated. 3.7.3.2 The silt fence will become the property of the Contractor upon completion of the project, unless otherwise ordered. New Hampshire Department of Transportation Standard Specifications – 2016

3.8Erosion Stone.

3.8.1 Erosion stone shall be placed to provide for temporary control of erosion or sedimentation including stone check dams, inlet control and stabilized construction entrances or where ordered. Upon acceptance of the Contract, the stone shall be removed as ordered.

3.9Maintenance.

3.9.1 Erosion control features shall be maintained by the Contractor throughout the life of the project. Method of Measurement

4.1Mulch and temporary mulch will be measured by the square yard or by the acre. When measurements are made by the acre,

such slope measurements will be made to the nearest 0.01 of an acre. 4.1.1 Bark mulch will be measured by the square yard measured along the slope of the ground.

4.2Rolled Erosion Control Products (RECP) will be measured by the square yard, based on the dimensions of the exposed

surface area of the product.

4.3Grass seed will be measured by the pound, as specified in 644.4.1.

4.4Hay bales for erosion control will be measured by the number of bales installed.

4.5The silt fence will be measured by the linear foot to the nearest 1/2 ft. Measurement will be along the top of the fence for

each continuous run in place with no allowance for splices or overlaps.

4.6Storm Water Pollution Prevention Plan will be measured as a unit. A unit will include preparation, submittals, modifications,

and resubmittals.

4.7Monitoring SWPPP and Erosion and Sediment Controls will be measured to the nearest 1/2 hou r, for the actual number of

authorized hours spent monitoring the construction site(s) and offsite areas specified in 3.2 and on-site summary monitoring report preparation and distribution. The minimum field time measurement will be 2.0 hours . Monitoring Erosion and Sediment Control will not be measured when there is no item for this work. 4.7.1 Travel time and other time not spent at the construction site(s) or off -site areas specified in 3.2.3.1 and time not authorized will not be measured , except that, with prior authorization , up to 1 hour will be measured for off -site consultation, information review and final recommendation, preparation and distribution of the accepted final Monitoring Report.

4.8Erosion stone will be measured per ton in accordance with 109.01.

4.9Erosion Control Mix will be measured per CY in accordance with 109.01.

Basis of Payment

5.1The accepted quantities of erosion control work will be paid for at the Contract unit price per square yard or per acre for

mulch and per square yard for Rolled Erosion Control Products (RECP), complete in place.

5.2Slope seed ordered for permanent erosion control and ryegrass ordered for temporary erosion control will be paid for as

provided under 644.

5.3Hay bales for erosion control will be paid for at the Item Bid Price per bale complete in place. No extra payment will be

made for removal of bales ordered removed.

5.4Tackifiers approved for use in 3.3.2 will be subsidiary.

5.5The accepted quantity of silt fence and replacements as ordered will be paid for at the Contract unit price per linear foot

installed. 5.5.1 Removing sediment deposits will be paid for under 699.

5.6The accepted Storm Water Pollution Preve ntion Plan (SWPPP) will be paid for at the Contract lump sum price. Initial

payment will be up to 60 percent of the amount bid upon approval of the SWPPP for the entire project. Subsequent payments wil l be made periodically based on the anticipated construction period and proposed construction sequence. 5.6.1 Modifications and resubmittals of the plan will be subsidiary.

5.7The accepted quantities of Monitoring SWPPP and Erosion and Sediment Controls will be paid for at the Contract unit price

per hour. 5.7.1 Travel time and other time not spent at the construction site(s) or off-site areas and support services (i.e. travel expenses, clerical staff, copying, miscellaneous expenses, overhead) except as stated in 4.6.1.1, will be subsidiary to Item 645.71. New Hampshire Department of Transportation Standard Specifications – 2016 5.7.2 Erosion and Sediment Control and Stormwater Management items necessary to implement and maintain the Storm Water Pollution Prevention Plan (SWPPP) for the construction site(s) will be paid for under the appropriate Items of 645 or as provided under Section 699.5.

5.8The accepted quantity of erosion stone will be paid for at the Contract unit price per ton delivered to the project, complete in

place, including any required excavation and stone removal, as ordered.

5.9The accepted quantity of erosion co ntrol mix will be paid for at the Contract unit price per CY. delivered to the project ,

complete in place, including any required stump grinding, excavation, as ordered.

5.10The Contractor shall maintain areas with permanent control, with no extra compensation, until the completion of the Contract.

5.10.1 Repair and maintenance of damaged or failed slopes, until project acceptance as stated in section . 5.10.2 The Department reserves the right to employ outside assistance or to use its own forces to provid e the necessary corrective measures and deduct the cost from money due the Contractor and/or withhold progress payments. . Pay items and units:

645.111 Mulch Square Yard

Mulch Acre

645.12Temporary Mulch Acre

645.15___ Bark Mulch___ in. Deep Square Yard

645.3Erosion Stone Ton

645.41Temporary Slope Stabilization Type A Square Yard

645.42Temporary Slope Stabilization Type B (Wildlife Friendly) Square Yard

645.43Temporary Slope Stabilization Type C Square Yard

645.44Temporary Slope Stabilization Type D (Wildlife Friendly) Square Yard

645.54Permanent Channel Stabilization Type A Square Yard

645.46Permanent Channel Stabilization Type B Square Yard

645.48Erosion Control Mix Cubic Yard

645.51Hay Bales for Temporary Erosion Control Each

645.52Ryegrass for Temporary Erosion Control Pound

645.531 Silt Fence Linear Foot

2 Silt Fence with Support Fence Linear Foot

645.7Storm Water Pollution Prevention Plan Unit

645.71Monitoring SWPPP and Erosion and Sediment Controls Hour

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of preparing the soil and furnishing and applying seed of the type or types specified, fertilizer,

limestone, and mulch if required, on all areas designated for turf establishment as shown on the plans or ordered.

This work shall also consist of furnishing and placing humus or loam as specified in the item description.

Materials

Limestone shall conform to 642.2.

Fertilizer shall be that for initial fertilization and shall conform to 643.2.

Seed shall conform to 644.2 using the type of mixture(s) ordered.

Mulch shall conform to 645.2.1.

Mulch tackifiers shall conform to 645.2.6 and be environmentally non-toxic.

Humus shall conform to 647.2.

Loam shall conform to 641.2.

Construction Requirements

Construction requirements shall conform to 641.3, 643.3, 644.3, 645.3 and 647.3.

Application rate of limestone shall generally be 130 po unds per 1,000 square feet, approximately 3 tons per acre, unless

otherwise ordered.

Mulch tackifiers shall be used as a tie-down or adhesive for mulch, it shall be used at the rate specified by the manufacturer,

and applied uniformly over and through the mulch. Method of Measurement

Turf establishment of the type specified will be measured by the acre or the square yard to the nearest 0.01 of an acre or

nearest square yard from measurements taken on the ground surface covered.

Turf establishment (F) of the type specified will not be measured, but shall be the square yard final pay quantity in accordance

with 109.11 for the area within the limits shown on the plans. Basis of Payment

The accepted quantities of turf establishment of the type specified will be paid for at the Contract unit price per acre or square

yard complete in place.

Turf establishment (F) of the type specified are final pay quantity items and will be paid for at the Contract unit pric e per

square yard in accordance with 109.11.

The material cost of crownvetch seed ordered by the Engineer added to slope seed type specified in the plans will be paid for

in accordance with 109.04. Pay items and units:

646.3Turf Establishment with Mulch and Tackifiers Acre

646.31Turf Establishment with Mulch and Tackifiers Square Yard

1 Turf Establishment with Mulch and Tackifiers (F) Acre

2 Turf Establishment with Mulch and Tackifiers (F) Square Yard

646.4Turf Establishment with Mulch, Tackifiers and Humus Acre

646.41Turf Establishment with Mulch, Tackifiers and Humus Square Yard

1 Turf Establishment with Mulch, Tackifiers and Humus (F) Acre

2 Turf Establishment with Mulch, Tackifiers and Humus (F) Square Yard

646.5Turf Establishment with Mulch, Tackifiers and Loam Acre

646.51Turf Establishment with Mulch, Tackifiers and Loam Square Yard

1 Turf Establishment with Mulch, Tackifiers and Loam (F) Acre

2 Turf Establishment with Mulch, Tackifiers and Loam (F) Square Yard