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HomeMy WebLinkAboutSPEC_329200_TURFANDGRASSES_08272021Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 1 SECTION 32 92 00 - TURF AND GRASSES PART 1-GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of each Contract, including General Conditions, Supplementary Conditions, and other Division 1 Specification sections, apply to work of this section. 1.2 DESCRIPTION A. Work in this section consists of furnishing all plant, labor, equipment, and performing all operations to finish grade topsoil, to prepare seedbeds, seeding native grass and seeding or sodding lawn areas, maintenance and protection of all planted areas. B. All exterior lawn areas within the seeding limits, except surfaces occupied by buildings, plant beds and paving, except areas indicated to be undisturbed shall be seeded or sodded as shown on Plans. C. All areas disturbed by construction activities including but not limited to irrigation trenches, contractor staging areas and general disturbed areas to be seeded as specified in this section per the drawings. 1.3 RELATED WORK DESCRIBED ELSEWHERE A. Irrigation System- Section 32 84 00. B. Landscaping- Section 32 93 00. 1.4 QUALITY ASSURANCE A. Qualification of Workmen: 1. Provide at least one person who shall be present at all times during execution of this portion of the work and who shall be thoroughly familiar with the type of materials being installed and the best methods for their installation and who shall direct all work performed under this section. 1.5 PRODUCT HANDLING A. Protection: 1. Upon delivery of sod to the work site use all means necessary to protect and maintain the sod before, during, and after installation and to protect the installed work and materials of all other trades. 2. All seed shall be delivered to the job site in the original bags with tags certifying purity, germination, common and botanical name for each species, and percent weed seed. All tags shall be removed from the bags by the Owner's Representative. Untagged seed bags shall be rejected. Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 2 B. Storage: 1. Seed, hydromulch, and hydromulch tackifier shall be kept in dry storage away from contaminants. C. Replacements: 1. In the event of rejection of the seed or sod, immediately make all replacements necessary to the approval of the Owner's Representative and at no additional cost to the Owner. D. Notice to Proceed: 1. The Contractor shall not proceed with seeding or sodding operations until the irrigation system has been tested and approved by the Owner's Representative. E. Schedules: 1. Install seed mixes during the specified time periods. If special conditions exist that may warrant a variance in the specified plant dates or conditions, a written request shall be submitted to the Owner's Representative stating the special conditions and proposed variance. F. Substitutions: 1. Request for substitutions, shall be submitted in writing prior to bid and in accordance with Section 01 25 00. PART 2 -MATERIALS 2.1 SEED A. General: All grass seed shall be: 1. Free from noxious weed seeds, and recleaned. 2. Grade A recent crop seed. 3. Treated with appropriate fungicide. 4. Delivered to the site in sealed containers with dealer's guaranteed analysis. 2.3 FERTILIZER A. General: 1. All fertilizer to be commercially prepared and shall contain the following percentages by weight: a. 16% Nitrogen. b. 16% Phosphoric Acid. c. 16% Potash. Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 3 2. Commercial fertilizer shall be complete, uniform in composition, dry and free-flowing. The fertilizer shall be delivered to the site in the original waterproof containers, each bearing the manufacturer's statement of analysis. B. Special Protection: 1. If stored at the site, protect fertilizer from the elements at all times. 2.4 MULCH A. All mulch for hydroseeding shall be North American Green GeoSkin (includes tackifier) as supplied by True North Steel, Billings, MT 59102 (406) 656-2253 or approved equal. Application rate per manufacture’s recommendations. 2.5 MULCH TACKIFIER A. See mulch above. 2.6 WATER A. Water for seeding operations shall be Contractor’s responsibility. PART 3 - EXECUTION 3.1 SURFACE CONDITIONS A. Inspection: 1. Prior to all work of this section, carefully inspect the installed work of all other trades and verify that all such work is complete to the point where this installation may properly commence. 2. Verify that seeding or sodding may be completed in accordance with the original design and the referenced standards. B. Discrepancies: 1. In the event of discrepancy, immediately notify the Owner's Representative. 2. Do not proceed with installation in areas of discrepancy until all such discrepancies have been fully resolved. 3.2 FINISH GRADING A. Finish Grading: 1. Grade lawn areas to finish grades, filling as needed or removing surplus dirt and floating areas to a smooth uniform grade. All lawn areas shall slope to drain. Where no grades are shown, surfaces shall have a smooth and continual grade between existing or fixed controls (such as walks, curbs, catch basins, elevations at steps or building). Roll, scarify, Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 4 rake and level as necessary to obtain true even lawn surfaces. All finish grades shall meet approval of the Owner's Representative before grass seed is sown or sod is laid. B. Fine Grading: 1. Upon completion of finish grading, perform all fine grading required in planting areas, using topsoil obtained from the site. C. Weed Control: 1. Prior to application of seed the seed bed shall be roughed up to a depth of 1/8 inch (32mm). 2. Moisten the seedbed to a depth of I inch (2.5 cm) to promote germination of any seeds contained in the topsoil. 3. After weeds have germinated and are growing vigorously, spray with Roundup in strict conformance with manufacturers specifications. Seeding shall be executed 7 days following Roundup application. Do not disturb the sterilized seedbed in any way prior to seeding. 3.3 SOWING NATIVE AND LAWN GRASS A. Preparation: 1. Seed bed preparation shall pertain to the preparation of the surface of the ground to receive the seed. The ground shall be hand or machine raked so as to remove all debris, clods, rocks, and other material larger than 1 inch (2.5 cm), to a depth of 4 inches (10.2 cm). Such debris, clods, rocks, and other material so removed shall be disposed of off the immediate property. Seed bed preparation shall not commence until the moisture conditions make the ground area and soil friable. 2. If there has been a time lapse following the placement of the topsoil to allow it to become settled and compacted on the surface, the area to be planted with seed shall be thoroughly worked to a depth of 3 to 4 inches (7.6 cm to 10.2 cm) so as to provide a surface of such condition that it will allow application of the seed in compliance with these Specifications. 3. Apply fertilizer at a rate of 5 pounds per 1,000 square feet (2.5 kg per 100 m1. Rake fertilizer lightly into top 1 inch (2.5 cm) of prepared seedbed. 4. Seed beds should be firm prior to seeding. Seed beds should be permitted to settle or should be firmed by rolling before seedings are made. B. Sowing: 1. Immediately prior to the application of the seed, the soil shall be loose to a depth of at least 1 inch (2.5 cm) and free from all material as specified. If soil is too loose or dry for good handling, it should be moistened and rolled lightly. 2. Seeding Methods a. Hand Broadcast –Hand broadcast shall be used in sensitive areas where other methods may cause unnecessary disturbance or in areas where species with a small seed are being applied. Contractor must receive approval for areas of broadcast seeding by Owner’s representative if not designated on the plans. Seed should be applied at double the specified seeding rate in all areas of broadcast seeding. All broadcast seeded areas shall receive straw or hydro mulch per specifications. Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 5 b. Drill Seeding – The seed drill shall be capable of accurately seeding native grass and forb species. Areas where drill seeding can be used will need to be accessible by a tractor and drill. The drill seeder shall have multiple seed boxes for different types and sizes of seed. Seed agitators are required to drop seed into a series of planters. The planters open a slot in the ground and plant the seeds ensuring that each seed is effectively planted to an optimal depth. The seeder must be able to be calibrated to the rate required for each type of seed, and must be able to be pulled by a wheeled or crawler tractor. The soil surface shall not be compacted. Shallow tilling (no greater than 2” below soil surface) may be required if soil surface is compacted. All drill seeded areas shall receive straw or hydro mulch. c. Hydroseeding - All seed shall be placed by hydraulic methods. Seed and mulch shall be applied in separate and distinct operations except that a minimal amount of mulch may be added to the seed slurry as a visual aid during the seeding process. Mulch applied with seed shall not exceed one pound mulch for each five gallons water (25 kg mulch for each liter of water). This mulch shall be deducted from the total quantity to be applied. The application of the seed slurry shall be made with the equipment having a built-in agitation system and operating capacity sufficient to agitate, suspend and homogeneously mix a slurry containing water, seed, and mulch. The slurry shall be sprayed over the soil in a uniform coat. Wherever practical, the slurry shall be applied normal to the surface being treated to effectively drill the seed into the seedbed. Hydromulch application shall follow seeding as soon as practical, with consideration for minimal soil erosion through washing. All seeded areas shall be mulched before work is terminated on any day. 3. Non-irrigated grass areas shall be seeded between March 1 and March 31 or between October 15 and October 31 unless otherwise directed by the Owner’s Representative. 4. Seed shall be sown exercising great care that a uniform distribution of seed is obtained. 5. Mulch application shall follow seeding as soon as practical, with consideration for minimal soil erosion through washing. All seeded areas shall be mulched within 24 hours of placement. B. Mulching: 1. Mulch all seeded areas. Topsoil or seed which washes out for reasons attributable to the Contractor's activities or failure to take proper precautions, shall be replaced at the Contractor's expense. 2. Hydro Mulching: a. All structures shall be protected from hydraulic application of mulch material. Any material deposited on walks, streets, inlets, or other structures, shall be removed. b. Mulch shall not be applied in the presence of free surface water, but may be applied on damp ground. c. Apply tank mixed mulch and tackifier at a rate of 2000 pounds per acre. d. Tank Mix: 1. Tank mix shall meet the manufacturer’s specifications and proportions: 2. Add tackifier and mulch to hydroseeder with machine in operation. Run hydroseeder agitator for a minimum of 2 minutes prior to applying tank mix to prepared seedbeds. 3. Straw Mulching: a. Straw mulching shall be used only on areas of drill or broadcast seeding. The work consists of placing a straw mulch cover on slopes or other designated areas following seeding. Crimped straw consists of a layer of straw or hay spread or Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 6 blown over the seeded or graded soil surface. The straw is then mechanically anchored to the soil surface. The action of rolling an implement over the surface of the straw creates rows of straw that stand up. The remainder of the straw protects the soil’s surface. b. Materials- Grass Hay or Straw Mulch: Grass hay or straw mulching material shall be certified noxious weed seed free. The mulch shall have been baled dry, in bales of approximately equal weight and shall be relatively dry when applied. Materials having characteristics making them unsuitable for the purpose intended will be rejected. The Owner’s representative shall approve the materials prior to installation. c. Placing- The straw mulch shall be placed within 24 hours after the seeding or grading has been completed. Mulching operations shall not be performed during periods of high winds, which impede the proper placing of the mulch. The placing of mulch shall begin on the windward side of the areas to be covered. On gentle to moderate slopes, straw mulch can be applied by hand broadcasting to a uniform depth of 2 - 3 inches. On steep slopes, the straw should be blown onto the slope to achieve the same degree of cover. For machine application, the machine shall blow or eject mulch, by a constant air stream, that controls the amount of mulch. The machine shall cause a minimum of cutting or breakage of the mulch. Mulch containing excessive moisture, which prevents uniform feeding through the machine, shall not be used. Mulch shall be placed uniformly over the seeded areas at a rate of 4000 pounds per acre (or one 74 pound bale per 800 square feet). Approximately 10 -20 percent of the soil surface shall be visible through the mulch blanket prior to mulch tiller (punching) operation. Excessive cover, which will smother seedlings, shall be avoided. The Owner’s Representative may order the placement of mulch on any area where protection is necessary to prevent erosion or encourage vegetation establishment. The mulch shall extend into existing vegetation or be stabilized on all sides to prevent wind or water damage which may start at the edges. d. Punching- Immediately following application, the mulch shall be punched into the soil. Punching shall be accomplished using one of three methods depending on slope and equipment availability: 1. Hand Punching- A spade or shovel is used to punch straw into the slope until all areas have straw standing perpendicularly to the slope and embedded at least 4 inches into the slope. It shall be punched about 12 inches apart. 2. Roller Punching- A roller equipped with straight studs not less than 6 inches long, from 4 - 6 inches wide and approximately one inch thick shall be rolled over the slope. 3. Crimper Punching- Like roller punching, the crimper has a series of dull, flat disks with notched or cutout edges. The disks shall be approximately 20 inches (500 mm) in diameter, ¼ inch (6 mm) thick, spaced approximately 8 inches (200 mm) apart which force straw mulch into the soil. Crimping shall be done in two directions with the final pass across the slope. Tiller members shall be ballasted; to push mulch into the soil approximately three inches with ends exposed above the soil surface. The mulch tiller shall follow as closely as possible behind the mulcher. More than one pass of the mulch tiller may be required to assure adequate anchoring. Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 7 C. Protection: Protect all seeded areas by erecting temporary fences, barriers, signs, etc. as necessary to prevent traffic. Barriers shall remain in place for at least six (6) weeks unless other arrangements are made with the Owner's Representative. 3.4 MAINTENANCE A. General: 1. Maintain all native grass and lawn areas for a period of 30 days following substantial completion of the job. 2. Contractor shall coordinate with the Owner to ensure seed establishment in disturbed areas. Overall turf maintenance of areas outside disturbed/seeded is not the responsibility of the Contractor. Reseeding of areas as needed is the responsibility of the Contractor. B. Work Included: 1. All irrigated areas shall be watered as required. 2. All areas shall be watched closely so that they are "not permitted to dry out or to form puddles of water, or to be washed by over-application. 3. Mow all lawn at 1- 1/2 inches (3.8 cm) with a self bagging mower each time its height reaches 3 inches (7.6 cm). Maintain through minimum three mowings to provide an even Example of crimped straw Example of mechanical straw crimper Project # 21012.00 VANCE THOMPSON VISION BOZEMAN, MT SITE PLAN SUBMISSION TURF AND GRASSES 32 92 00 - 8 stand over the entire seeded area. Continue mowing all lawns at 1-1/2 inches (3.8 cm) until acceptance. 4. Mow native areas to a height of 6” per direction of Owner’s representative, for a maximum of 4 mowings throughout seed establishment. C. Replacements: 1. Any area that fails to produce an adequate stand of grass as determined by the Owner until Final Completion shall be reseeded by the Contractor at no additional expense to the Owner. If seeding is found to be unsatisfactory the final completion date shall be extended as required until seeding acceptance by Owner at the Contractor’s expense. 2. Replacements required because of vandalism or other causes beyond the control of the Contractor are not part of the Contract. D. Extension of Maintenance Period: 1. Continue the maintenance period at no additional cost to the Owner until all previously noted deficiencies have been corrected, at which time the final inspection shall be made. END OF SECTION 02820