107 SECTION 211 DESCRIPTION
211.01.01 General. This work consists of salvaging topsoil, furnishing and placing topsoil, seeding, hydro-
seeding, placing erosion control fabric, and applying soil stabilizer on graded and disturbed areas. Coordinate erosion control work with the Storm Water Pollution Prevention Plan (SWPPP). Coordinate erosion control work with NPDES Phase 2 permit requirements. Per NPDES Phase 2 permit requirements , 70% of pre-disturbance native plant cover shall be achieved before the Notice of Termination (NOT) can be issued. If adequate coverage is not achieved, reapply all components of erosion control treatment. Unless the project site is irrigat ed, perform seeding and hydro-seeding from September 15 to February 15 for any year. Apply erosion control work within 60 days of finish grading unless this date falls outside of September 15 to February 15. Apply erosion control treatments per specifications and the Department’s Best Management Practice Manual within 30 days of finish grading to all areas not treated between September 15 and February 15. Upon completion of installation and approved inspections, provide a certification letter from a Certified Professional in Erosion and Sediment Control (CPESC) that the project has been installed in accordance with the approved plans and Department approved changes. In addition to the requirements in Section 637, do not allow Cheatgrass (Bromus tectorum ) or Red Brome (Bromus rubens) within the project area. Remove weeds by hand or treat with herbicides approved for use on the QPL and apply according to manufacturer’s directions. MATERIALS
211.02.01 General. Material shall conform to the following Section:
Roadside Materials .................................................................................................................................................................. Section 726 The rates of application of amendments, inoculants, seed, mulch, tackifier, and soil stabilizer will be specified in the contract documents. CONSTRUCTION
211.03.01 Topsoil (Salvage). Topsoil (salvage) consists of removing existing topsoil, stockpiling, treating if
required, preparing areas for placement, placing at designated areas, and compacting. Remove existing topsoil to a depth of 150 mm (6 in.) maximum or as shown or specified. Screen the material according to Subsection 726.03.02. Stockpile this material in approved areas. Do not stockpile topsoil more than 1.8 m (6 ft) in height and do not compact stockpiles. Stabilize stockpiles of topsoil that are in place for less than 1 month with water or dust palliative. Dust palliative shall not inhibit vegetative growth. For topsoil stockpiles in place more than 1 month, apply an erosion control treatment to the stockpile consisting of a slurry with seed, soil inoculant, mulch, tackifier, water, and amendments as specified. Maintain stockpiles using Best Management Practices in accordance with NDOT’s Construction Site Best Management Practices Manual. If areas for topsoil stockpiles are limited and require stockpiling at heights greater than 1.8 m (6 ft) in height, apply an erosion control treatment as specified above. Prepare final placement areas by cultivating and roughening slopes with rippers, discs, or other approved equipment, in the direction with the contours where possible to a depth of 150 mm (6 in.). 211 EROSION CONTROL 108 Do not perform cultivation until all other equipment is through working in the area. Operate equipment such that furrows are produced perpendicular to the natural flow of water. Transport topsoil directly from the stockpile to final position. Evenly and uniformly spread topsoil to a depth of 75 mm (3 in.) . If needed, moisten with water as directed to increase the bond between the topsoil and subsoil. The topsoil finished surface shall conform to the finished grade contours d epicted on the grading plans. Do not place topsoil when the ground or topsoil is frozen, excessively wet, or not in an acceptable condition to facilitate uniform spreading. Compact topsoil in accordance with Subsection 211.03.0 3.
211.03.0 2 Topsoil . Tops oil consists of preparing areas for placement, transporting topsoil from approved
sources, placing the topsoil at designated areas, and compacting . Prepare final placement area s by cultivat ing and roughen ing slope s with rippers, discs , or other approved equipment, in the direction with the contours where possible to a depth of 150 mm (6 in.) . Do not perform cultivation until all other equipment is through working in the area. Operate equipment such that furrows are produced perpendicular to the natural flow of water. Transport approved topsoil directly from the source to final position. Evenly and uniformly spread topsoil to a depth of 75 mm (3 in.) . If needed, moisten with water as directed to increase the bond between the topsoil and subsoil. The tops oil finished surface shall conform to the finished grade contours depicted on the grading plans. Do not place topsoil when the ground or topsoil is frozen, excessively wet, or not in an acceptable condition to facilitate uniform spreading. Compact topsoi l in accordance with Subsection 211.03.0 3.
211.03.0 3 Compaction. Compact topsoil by sheepsfoot roller, cleated crawler tractor, or similar approved
equipment which will produce 1,000 to 2,000 kPa (150 to 300 psi) ground pressure to produce final compactio n of topsoil that is approximately 70 to 80 percent of the relative maximum density . Design and construct equipment to produce a uniform rough textured surface consisting of small undulations that trap surface runoff and br eak up surface flow continuity, and which will bond the topsoil to the underlying material. Operate compaction equipment parallel to the natural flow of water on the slopes or perpendicular to the contour of the slopes, unless otherwise approved. Convey the roller or approved equipment up and down the slopes by approved means. Finish grade of the topsoil to be 25 mm (1 in.) below the top of curbs, catch basins , and other structures. To condition the topsoil for compaction, furnish a suitable amount of water and apply by approved methods. Moisten topsoil with water to bind topsoil together.
211.03.0 4 Soil Amendments and Inoculants . Apply inoculant at a rate of 56 kg per hectare [ 50 pounds per
acre (82 spores/ft2)]. The application rates for soil amendments will be specified in the Special Provisions.
211.03.0 5 Seeding. Seeding consists of applying soil amendments and inoculants, prepar ing the areas ,
applying seed, and applying mulch and tackifier. Furnish and apply soil amendments and inoculants at the rates specified in Subsectio n 211.03.04. Evenly apply soil amendments and inoculants to the areas to be seeded . If applied hydraulically, mix soil amendments and inoculants in a tank equipped with an agitator so that a uniform suspension is achieved and maintained. The amendments an d inoculants shall not remain in the tank longer than 1 hour. Mix amendments and inoculants into soil and p repare the seeding area s by tilling the soil to a minimum depth of 150 mm (6 in.). Operate equipment such that furrows are produced perpendicular to the natural flow of water. Remove and dispose of all rocks larger than 150 mm (6 in.) in smallest dimension from the surface of slo pes to be seeded. EROSION CONTROL 211 109 Give a minimum of 48 hours notification in advance of any seeding operations for approval of the seeding areas. After approval, seeding of the approved areas may begin. Materials for seeding shall be batched on site under the observatio n of the Department or designated representative. Provide qualified personnel experienced in all phases of seeding , equipment, a nd methods as herein specified. Do not seed when there are sustained wind s of 21 km/hr (13 mph ) or more, or conditions that m ay cause material to disperse or apply inaccurately. Do not seed when the ground is frozen. Uniformly spread seed at the rate and mix specified. On slopes 3:1 (horizontal to vertical) or flatter, seeding shall be accomplished by drill seeding. All other areas shall be seeded by hydro -seeding. Perform drill seeding with approved power -drawn drills with double -disc front delivery openers and depth bands for positive depth control. Set depth control at a depth of 19 mm (3/4 in.) for consistent furrow bottom placement. An approved deep furrow drill may be used where it is determined the seedbed is firm and there is little danger of soil blowing. An approved spreader may be used for fertilizer placement. Calibrate drills and spreaders using an approved method before use . Perform hydro -seeding with an approved type hydro -seeder which utilizes water as the carrying agent (hydraulic) and maintains a continuous agitator action that will keep seed and additives mixed in uniform distribution until pumped from the tank. Maintain pump pressure to maintain a continuous, non -fluctuating stream of solution. Areas that cannot be drill seeded or hydro -seeded shall be seeded by an approved method. Uniformly distribute the material at the rates specified. Apply mulch and tackifier in accordance with Subsection 211.03.0 6.
211.03.0 6 Mulch. Within 24 hours after each area is seeded , straw mulch shall be applied, crimped, and
tacked. Uniformly apply mulch by means of an approved type mulch spreader at the minimum rate of 4.5 metric tons per hectare ( 2 tons per acre ). The spreader shall produce a uniform distribution of the straw, without cutting or breaking it into short stalks. Crimp mulch by anchoring it into the soil with a heavy disc, sheeps -foot roller , or similar ap proved equipment. Discs shall be flat and serrated, with at least 6 mm (1/4 in.) thickness having dull edges, and spaced no more than 225 mm (9 in.) apart. Straw mulch shall be anchored to a depth of at least 50 mm (2 in.) and shall not be covered with an excessive amount of soil. Anchoring operations shall be across the slopes where practical, with no more than two passes of the anchoring equipment. Immediately following the crimping operation, the crimped area shall be tacked. Tack mulch using a slurry c onsisting of a minimum of 168 kg of tacking agent , 560 kg of thermally refined wood fiber mulch, and 336 kg of water per hectare (1 50 pounds of tacking agent, 500 pounds of thermally refined wood fiber mulch, and 300 gallons of water per acre ). The slurry shall contain a color additive which will assist the applicator in the uniform application of the mixture . Apply the slurry with approved hydraulic equipment. Use equipment with a built in agitation system with an operating capacity sufficient to agitate, suspend , and homogeneously mix the specified portions of the slurry . Equip distribution and discharge lines with a set of h ydraulic discharge spray nozzles which will provide a uniform distribution of the slurry. Do not disturb surface areas after mulching and tacking is complete. Repair damaged areas as directed .
211.03.0 7 Hydro -seeding . Hydro -seeding consists of applying soil amendments and inoculants, prepar ing
the areas, and applying a slurry mix of seed, mulch , and tackifier. Furnish and apply soil amendments and inoculants at the rates specified in Subsection 211.03.04. 211 EROSION CONTROL 110 Evenly apply soil amendments and inoculants to the areas to be hydro -seeded. If applied hydraulically, mix soil amendments and inoculants in a tank equipped with an agitator so that a uniform suspension is achieved and maintained. The amendments and inoculants shall not remain in the tank longer tha n 1 hour. Mix amendments and inoculants into soil and p repare the hydro -seeding area s by tilling the soil to a depth of 150 mm (6 in.). Operate equipment such that furrows are produced perpendicular to the natural flow of water. Remove and dispose of all rocks larger than 150 mm (6 in.) in smallest dimension from the surface of slopes to be hydro -seeded. Give a minimum of 48 hours notification in advance of hydro -seeding operations for approval of the hydro - seeding areas. After approval, hydro -seeding of the approved areas may begin. Materials for hydro -seeding shall be batched on site under the observation of the Department or designated representative. Provide qualified personnel experienced in all phases of hydro -seeding , equipment, a nd methods as her ein specified. Do not hydro -seed when there are sustained wind s of 21 km/hr (13 mph ) or more, or conditions that may cause material to disperse or apply inaccurately. Supply certified instruments or data from certified instruments for verification of wind velocity, if directed. Do not hydro -seed when the ground is frozen. Apply the slurry (seed, mulch , and tackifier) in one application with a hydro -seeder which utilizes water as the carrying agent (hydraulic) and maintains a continuous agitator action that will keep the slurry mixed in uniform distribution until pumped from the tank. Maintain pump pressure to maintain a continuous, non -fluctuat ing stream of solution. Use enough water to ensure even distribution. Apply slurry within 1 hour of mixing. Do not disturb surface areas after hydro -seeding is complete. Repair h ydro-seeded areas that are disturbed or damaged by re-application of hydro -seeding. It is anticipated that 20% of the hydro -seeded area shall require an additional application. Areas requiring re - application will be determined . Apply the additional application within one year of the initial application.
211.03.0 8 Erosion Control Fabric . Place erosion control fabric parallel to the flow of water. Place
immediately following final grading, or immediately following seeding /hydro -seeding if such work is r equired. Overlap fabric a minimum of 150 mm (6 in.) with the up -grade section on top. Bury the up -slope end of each strip of fabric in a 150 mm (6 in.) key trench with the soil firmly tamped against it. Any other edge exposed to more than normal flow of water or strong prevailing winds may be required to be buried in a similar manner. Place key trenches between the ends of strips by placing a tight fold of the fabric at least 150 mm (6 in.) vertically into the soil. Tamp and staple the fabric at the check slots the same as up -slope ends. Space check slots so that one check slot or one end occurs within each 15 m (50 ft) of slope. Bury edges of fabric around the edges of catch basins and other structures as herein described. Spread fabric evenly and smoothly and in conta ct with the soil at all points. Fasten fabric by approved wire staples, pins, spikes, or wooden stakes driven vertically and flush with the soil. Fasten fabric at intervals not more than 1 m (3 ft) apart in 3 rows for each strip of fabric. Place one row along each edge and one row alternately spaced in the middle. Fasten all ends of the fabric and check slots at 150 mm (6 in.) intervals across their width .
211.03 09 Soil Stabilizer . Complete all landscape planting as provided for in Section 212 prior to applying
soil stabilizer . Mix and apply the soil stabilizer when weather conditions are suitable and as recommended by the manufacturer. Do not add herbicides or soil sterilizers to the soil stabilizer. Prior to applying soil stabilizer, track -walk all accessible disturbed areas or operate equipment s uch that furrows are produced perpendicular to the natural flow o f water (parallel to contours). EROSION CONTROL 211 111 Apply soil stabilizer according to the plans . Do not disturb treated surface areas after soil stabilizer has been applied. If areas are subsequently disturbe d or damaged , repair area by re-application of soil stabilizer . Protect buildings, walls, landscaping, and other objects within the vicinity from over spray. Store, handle , and apply soil stabilizer per manufacturer’s recommendations. Add a color pigment to the soil stabilizer at the time of application. Soil stabilizer shall form a crust like barrier within 4 to 8 hours. The use of accelerators is recommended. Non-decorative rock areas to receive soil stabilizer shall be compacted to a minimum of 90% relative density prior to placement of soil stabilizer. Place soil stabilizer in these areas in accordance with manufacturer’s recommendations. Do not use fiber mulch products in traffic areas. METHOD OF MEASUREMENT
211.04.01 Measurement . Topsoil (Salvage) will be measured by the cubic meter (cubic yard).
Topsoil will be measured by the cubic meter (cubic yard) in the haul conveyance at the point of delivery. Seeding, hydro -seeding , and s oil stabilizer will be measured by the hectare (acre) or square meter (square yard). Erosion control fabric will be measured by the square meter (square yard) of surface covered. No allowance will be made for material overlap. The estimated quantities shown on the pla ns, plus or minus authorized changes, will be the quantity used for payment. The Engineer or the Contractor may, however, request recalculation of the quantities. Submit request for recalculation of quantities in writing. When quantities are recalculated, the recalculated quantities will be used for payment. BASIS OF PAYMENT
211.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment will be made under: Pay Item Pay Unit Topsoil (Salvage) ................................ ................................ ................................ ................................ ................ Cubic Meter (Cubic Yard) Topsoil ................................ ................................ ................................ ................................ ................................ Cubic Meter (Cubic Yard) Seeding ................................ ................................ ................................ ............................. Hectare (Acre) or Square M eter (Square Yard) Seeding (type) ................................ ................................ ................................ ................... Hectare (Acre) or Square Meter (Square Yard) Hydro -seeding ................................ ................................ ................................ ................... Hectare (Acre) or Square Meter (Square Yard) Hydro -seeding (type) ................................ ................................ ................................ ......... Hectare (Acre) or Square Meter (Square Yard) Erosion Control Fabric ................................ ................................ ................................ ................................ ... Square Meter (Square Yard) Soil Stabilizer ................................ ................................ ................................ ..................... Hectare (Acre) or Square Meter (Square Yard) 113 SECTION 212 LANDSCAPE AND AESTHETICS DESCRIPTION
212.01.01 General. The work consists of constructing landscape and aesthetic features.
MATERIALS
212.02.01 General. Material shall conform to the following Section:
Roadside Materials ................................ ................................ ................................ ................................ ................................ .. Section 726
212.02.02 Nomenclature. Nomenclature for plant names and varieties shall be according to the latest edition
of “Standardized Plant Names” as prepared by the American Joint Committee on Horticultural Nomenclature. Plants will be grouped as follows: Plants , Group A ................................ ................................ ................................ ................................ .............. containerized plant material Plants, Group B ................................ ................................ ................................ ................................ .. balled and burla pped plant material Plants, Group C ................................ ................................ ................................ ................................ ................................ ..... ground cover * The size of containerized plant material will be indicated in the description of the particular bid item. For example, Plants (Group A -2) denotes a #2 Container Size, Plants (Group A -5) a #5 Container Size, and so on.
212.02.03 Quality of Plant Materials. Provide plant material meeting the standards as set forth herein.
During inspections plant material will be judged and rejections will be based upon these standards. Plants shall comply with Federal and State laws requiring inspection for plant diseases and infestations. Inspection certificates required by law shall accompany each shipment of plants. Submit inspection certificates upon plant delivery. Plant material shall be per the standards of the American Standards for Nursery Stock and shall be symme trical, typical for variety and species, sound, healthy, vigorous, free from plant disease, insect pests or their eggs, mechanical injury (trunk or bark wounds), excessive abrasions, or other disfigurements, and shall have healthy, normal root systems, wel l fitting their containers, but not to the point of being root bound. Roots that are kinked girdling, circling or J roots will be rejected. Plant material shall be sturdy and well hardened off. Trees and shrubs shall not be pruned prior to delivery. Trees with damaged, cut , or topped central leaders will not be accepted. P lant material shall have normally well developed branch systems with undamaged straight central leader and well balanced tops. Trees grown staked in a nursery will not be accepted unless stakes have been removed for a minimum of two years before the trees are dug from the nursery. A certification of this condition shall be provided at or before delivery of trees to the site. Plant nomenclature shall be defined by the Plant Schedule or Pla nt Legend located on the plans. Plants shall be the variety and size shown . Plants shall be tagged with their botanical and common plant name. Plants shall be grown under climate conditions similar to those in the locality of the project, including USDA Zo ne. Plants will be evaluated for root condition , size (above ground) , insects, insect eggs, larva , disease free condition , general appearance (color, shape, prior pruning) , damage from shipping including broken branches , and i dentifi cation tags. A deficie ncy in any one of these elements will be sufficient reason to reject selectively or by lot.
212.02.04 Handling and Shipping. Pack plants for shipment according to standard practice for the type of
plant being shipped. Do not allow the root system of plant s to dry out at any time. Protect plants at all times against heat, freezing temperatures, sun, winds, climatic, and seasonal conditions during transit. Furnish plant material in containers unless otherwise specified. Handle all plants specified balled and burlapped (B&B) by the ball of earth and not the plant. Broken or “made” balls , or balled and burlapped plants placed in a larger container will not be accepted. Supply container grown plants well developed with sufficient root development to hold the earth intact after removal from the container without being root bound.