for Highway Construction Page 577 of 715 SECTION 651 – LAWN CONSTRUCTION
651.01 Description.
Prepare site, construct and install sod or turf, or apply seed, and maintain designated lawn areas. Ensure construction work and lawn area are established to the specif ied condition at the end of the specified establishment period.
651.02 Materials.
Ensure plant materials conform to the curren t edition of American Standard for Nursery Stock.
A.Turf Seed. Provide turf seed that consists of drought -tolerant, fine -textured, turf- type grasses that are specific for the project site. This may include fescue, bluegrass, perennial ryegrass, or a combination of the type suitable for the designated turf area. Refe r to 711.05 for fur ther seeding requirements.
B.Sod. Provide sod that consists of drought tolerant, fine textured, turf -type grasses that are specific for the project site. This may include fescue, bluegrass, perennial ryegrass, or a combination of the type suitable for the designated sod area. Provide grass species true to type and name in accordance with the standard plant names, current edition, by the Editorial Committee of the American Joint Committee on Horticultural Nomenclature. Provide grass sod less than 10 months old, free of weeds and undesirable plants , and not frozen or dormant. Obtain the Engineer’s prior approval of the supply source before cutting and delivering to the planting site. Ensure sod has been properly handled and cared for, has natural color, is in healthy condition, and properly stored, watered, and cultivated. The Engineer will reject sod showing evidence of improper handling or discoloration d ue to prolonged storage before delivery and placement .
C.Fertilizers and Soil Conditioners. Refer to 711.07 and 711.08.
D.Soil Amendment. Refer to 711.18.
E.Mulch . Refer to 711.10.
651.03 Construction Requirements.
Amen d the soil with fertilizers, soil conditioners, soil amendments and mulch or combinations to the specified condition, as per seed and sod nutrient requirements, and as recommended by a contractor -supplied soil analysis.
A.Lawn B ed Preparation. Till the lawn areas to at least 4 inches deep by means that will loosen the soil and bring it to a condition suitable for seeding, sodding, and fine grading. Before and during this operation, make the surface free of for Highway Construction Page 578 of 71 5 vegetative growth. Remove weeds, stones larger than 1 inch, hard clods, roots, sticks, debris, and other matter encountered during tilling that is detrimental to good seed bed preparation, or that is toxic to grass. Provide soil amendment for sodding that consists of organic soil, coarse sand (100 percent passing the No. 10 sieve and 100 percent retained on the No. 4 sieve), decomposed sawdust, flexible flax fibers, sphagnum peat moss, compost, and other biological additives or combinations. Uniformly spread and incorporate soil amendments, conditioners, and fertilizer applications into the upper 4 inches of lawn bed. Ensure the volume percentage of the top 4 inches of the lawn bed after mixing consists of ap proximately 65 percent native topsoil , 25 percent coarse sand , and 10 percent organic soil conditioner. After fertilizers, soil conditioners and soil amendments are incorporated, work the areas as necessary to provide a smooth, firm but friable lawn bed at the required finish grades . After cultivation, carefully fine grade and roll the area to the required finish grade and provide a fine textured, smooth and firm surface, without any foot pr ints, undulations or irregularities. Provide good drainage by smoothing irregularities on the surface that form pockets where water will sit or accumulate. Finish grading lawn seeding area adjacent to walks, driveways, and pavements to approximately 1 inch below the adjacent walk, driveway, and pavement finish grades . Finish grading the sod bed to 1¼ to 1½ inches below the adjacent walk, driveway, and pavement finish grades .
B.Turf Seed & Sod Application. Apply turf seed uniformly to lawn areas by one of the following methods:
1.With an approved double roller landscape seeder.
2.In a slurry with a hydroseeder (for slopes s teeper than 3H:1V).
3.Hand broadcast and raked or covered with a drag. Plant seed 1/8 inch deep or less, ensure the ground surface is true to grade, and without ruts, foot prints, or other irregularities. Do not apply slurry mixture during windy conditions (winds in excess of 15 mph), when the ground is excessively wet (standing or pooled water on surface) or frozen, or if rainy conditions are anticipated within 24 hours of application. In the event of unanticipated rainy conditions, re- apply the mixture to all uncured areas. Ensure hydroseeded mixture has at least 48 hours before a rain event for soil binder to cure. The Engineer may reduce curing time. Apply the slurry mixture within 30 minutes of adding the seed to the slurry mixture. Mix and apply the slurry mixture products in accordance with the manufacturer's written instructions. Submit a copy of the manufacturer's written instructions to the Engineer at least 10 calendar days before beginning application. Do not install the sod if the soil has pooled or puddled water accumulation on the surface, or when the ground is excessively wet, frozen, or otherwise un- tillable. Cut individual sod pieces to a uniform size with square corners at a uniform depth of 1 to 1¼ inches. Lay the first row of sod in a straight line and subsequent rows placed parallel to and tightly against each other. Stagger lateral joints. Ensure butt joints between strips are tight without any gaps. Exercise care to ensure that the sod is not stretched or overlapped. After placing the sod, roll the lawn with a sod roller in a diagonal direction then water sod and allow water to soak into the root system. Ensure sod is moist but do not allow water to puddle or pool on the surface. Ensure the finished sod surface is smooth and uniform. for Highway Construction Page 579 of 71 5 C. Establishment Period. The soil may need more than 1 fertilizer and soil conditioner application during the establishment period. Contact the Engineer for final acceptance and to determine whether additional fertilizers and/or soil conditioners are needed.
1.Seeded Areas. The seeded lawn establishment period begins at completion of initial grass sowing. The establishment period ends when each lawn area has been mowed at least 5 times, a nd presents a healthy and well cared for appearance with a uniform color, texture, and condi tion without weeds. Seeded area establishment consists of:
a.Protecting the planted area from trespass and other damage hazards.
b.Promoting seed germination and grass growth.
c.Mowing.
d.Removing clippings, weeds, litter, and debris.
e.Reshaping, reconditioning, and reseeding areas that become eroded, washed out, flooded, or which for any reason fail to show healthy specified grass growth. Water lawn areas in accordance with good horticultural practices for the prevailing or existing conditions. Provide water for the establishment period unless a Department -owned or Department - controlled water supply system is available. Mow t he first time when the grass has attained a height of approximately 3 inches, and when the ground is sufficiently firm to prevent rutting. Mow the grass to a height of 2 inches, subject to the approved modification relative to the kind of grass and the season. Provide subsequent mowing when the grass attains a height of 3 inches. Cont ain grass clippings in a bag or grass catcher, or remove clippings from mowed areas within 2 hours after mowing for the first 2 mowings. Do not allow clippings to smother or retard grass growth. Provide individual or blanket treatment weeding and noxious vegetation removal in accordance with accepted lawn care practices. The Department will conduct an evaluation at the end of the establishment period and identify any areas that have not met the requirements. Reseed the areas identified by the Department as not meeting the contract at no additional cost. Supply the same grass seed type in accordance with the original work requirements, including the establishment period.
2.Sodded Areas. The establishment period ends 2 weeks after l awn completion and acceptance or when the Engineer accepts the completed work, whichever comes first, and when sodded areas present a healthy and well cared for appearance with a uniform color, texture, and condition without weeds.
D.Extension of Establishment Period. Bring areas not acceptable at the end of the normal establishment period to the specified condition before final acceptance. The Engineer may extend the establishment period. for Highway Construction Page 580 of 715 651.04 Method of Measurement. The Engineer will measure acceptably completed work as follows:
1.Seeded lawn by the acre to the nearest 0.01 acre constructed and established.
2.Sodded lawn by the square foot of lawn constructed and established. Fertilizer, so il conditioner, soil amendment, and mulch will be by force account as specified in 109.03.C.5.
651.05 Basis of Payment .
The Department will pay for accepted quantities as follows: Pay Item Pay Unit Lawn Construction – Seeded .................................................................. Acre Lawn Construction – Sodded .................................................................. SF Fertilizer and Soil Conditioner ................................................................. CA Soil Amendment ..................................................................................... CA Mulch ...................................................................................................... CA Topsoil will be p aid for as specified in 213. The soil analysis cost is incidental . for Highway Construction Page 581 of 715 SECTION 652 – UNDERGROUND SPRINKLER SYSTEM
652.01 Description.
Provide, install, and test an underground sprinkler system.
652.02 Material s.
Incorporate new material s and equipment in the system with performance test certifications when requested.
A.Water Pipe and Fittings. Provide PVC plastic water pipe and fittings. Use standard design fittings appropriate for the type of pipe and pressure rating. Ensure pipe and fittings meet the requirements of ASTM D2241 for SDR 26, PR 160 pipe and stamped N.S.F. approved. Use only standard fittings designed for their specific use, selected and installed to provide the least friction loss of water. Use only the appropriate materials (e.g., cements, solvents, thinners, joint compounds) accepted for use with the kind of pipe used.
B.Sprinkler Heads. Provide sprinkler heads of the sizes, capacities, and types as specified to ensure uniform coverage at the operating water pressure. Provide sprinkler heads with working parts made of sturdy durable materials. Ensure nozzles, orifices, and working parts are precision machined and highly resistant against wear.
1.Stationary. Provide st ationary, non- pop-up sprinkler heads for lawn and shrub areas with orifices or nozzles that spray in a full -circle or part -circle, as specified. Provide spray heads with removable and interchangeable orifices or nozzles that can adjust water volume and cov erage area.
2.Pop-up Non- Revolving. Provide pop- up, non -revolving sprinkler heads with orifices or nozzles that adjust water volume and coverage area. Ensure the pop- up portion of the head returns freely to its closed position when it is se t to an angle of 30 degrees. Provide sprinkler heads that are accessible from the top without disturbing the sprinkler housing. Ensure orifices and nozzles are removable and interchangeable from the top of the head without disturbing the sprinkler housing or ground.
3.Pop-up Rotary. Provide pop -up rotary sprinkler heads and working parts that operate smoothly without ceasing under the specified operating pressure. Provide a sprinkler assembly with nozzles that are interchangeable and replaceable without disturbing the sprink ler assembly or the ground. Provide pop- up rotary sprinkler heads that are water jet or impulse motivated. Ensure a heavy retractor spring provides positive plate closing when in the off position. Ensure the complete working assembly is removable fr om above the ground as a unit to allow for adjustment and servicing. Ensure part -circle heads are adjustable to any part of a circle from 90 to 360 degrees.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 613–616 of 768.