OFFICE OF THE CITY CLERK OF OMAHA - Douglas County

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SUPPLEMENTAL SPECIFICATIONS 16. SEEDING Project No. C-28(492) 5. The grade and the guaranteed analysis of a fertilizer express the minimum total nitrogen content, and the minimum available phosphoric acid content (P O) and the minimum water soluble potash (K O) content in that order 15-15-0 grade fertilizer contains 15 percent total nitrogen, 15 percent available phosphoric acid, and zero percent water soluble potash. 16.10 - Construction Methods The fertilizer shall be applied with approved mechanical spreaders or with the hydraulic seeder, at the rate specified in the specifications and shall uniformly cover the entire area. Fertilizer shall be applied to the seed bed or area to be sodded prior to seeding or sodding. 16.11 - Basis of Payment This work will not be paid for directly but shall be considered as subsidiary work pertaining to the items which require the use of fertilizer. III. EROSION CONTROL BLANKET 16.12 - Description This work shall consist of placing erosion control blanket on areas designated by the engineer or shown on the plans. 16.13 - Material Requirements The erosion control blanket shall be 100% agricultural straw stitched with two photo/degradeable polypropylene nets (0.558 x 0.5 inch mesh size) The blanket shall be netted on both sides and sewn together with biodegradeable multifilament thread. Property Test Method Result Thickness ASTM D5199/ECTC 0.34 in. Resiliency ECTC Guidelines 56% Mass/unit area ASTM D5261 9.2 oz/sy Water Absorption ASTM D1117/ECTC 513% Swell ECTC Guidelines 10% Stiffness/Flexibility ASTM D1388/ECTC Light Penetration ECTC Guidelines 5% Smolder Resistance ECTC Guidelines 0.4 x 2.4 in. MD Tensile Strength ASTM D5035/ECTC 14.9 x 8.0 lbs/in. MD Elongation ASTM D5035/ECTC 35.4 x 25.6% TD Tensile Strength ASTM D5035/ECTC 96 lbs/ft TD Elongation ASTM D5035/ECTC 27.3% 16.14 - Construction Methods 1. SLOPE APPLICATION: A. Staple the blanket at the top of the slope in a 6” deep x 6” wide trench. Backfill and compact the trench so that the water will flow evenly onto the blanket. 16 - 5
Project No. C-28(492) SUPPLEMENTAL SPECIFICATIONS 16. SEEDING B. Roll the blanket either down the slope or horizontally across the slope insuring good contact between the blanket and soil. C. Overlap edges of the blanket a minimum of 2” with parallel blankets. D. If more than one blanket is needed for the run then overlap adjoining ends a minimum of 4”. Staple overlap area in a staggered pattern with staples. 2. NON SLOPE APPLICATION: Overlap edges of the blanket a minimum of 2” and staple. 3. STAPLES A. In standard soil applications the staple shall be a 6” 2 sided staple. In sandy soils the staple shall be 8”-10”. In extremely loose soil situations the staples shall be 18” and include washers. B. The staples shall be installed in a staggered pattern at the rate of 1 to 2 staples per square yard. 16.15 - Method of Measurement and Basis of Payment This work will not be paid for directly but shall be considered as subsidiary work pertaining to the items which require the use of erosion control blanket. IV. MULCHING 16.16 - Description This work shall consist of placing mulch on areas designated by the engineer or shown in the plans. The mulch shall be loose enough to allow sunlight to penetrate and air to slowly circulate, but thick enough to shade the ground, reduce rate of water evaporation and prevent or reduce water or wind erosion. The mulch shall be dry cured native hay applied at the rate of two tons per acre or dry threshed grain straw applied at the rate of 2.25 tons per acre. 16.17 - Material Requirements Mulch shall be either dry cured native hay or threshed grain straw. Hay or straw shall be free from seeds of noxious weeds and relatively free from seeds of all other weeds. 16.18 - Construction Methods 1. The contractor shall apply a protective mulch, consisting of dry cured hay or threshed grain straw within 48 hours after sowing the seed, unless otherwise directed by the engineer. The mulch shall be applied with a mulch blowing machine or other approved methods at the rate specified in these specifications. 2. Immediately following the spreading of the mulch seeding areas, the material shall be anchored to the soil by a V-type wheel land packer, a soil erosion mulch tiller, or other suitable equipment which will secure the mulch firmly to form a soil-binding mulch. The contractor shall furnish the necessary equipment, and assistance needed to insure that specified quantities are being placed. 16.19 - Method of Measurement and Basis of Payment This work will not be paid for directly but shall be considered as subsidiary work pertaining to the items which require the use of mulch. V. SODDING 16 - 6
Page 1 and 2: DOUGLAS COUNTY ENGINEER 15505 WEST
Page 3 and 4: Project No. C-28(492) DOUGLAS COUNT
Page 5 and 6: Project No. C-28(492) The only pers
Page 7 and 8: Project No. C-28(492) 5. Supervisio
Page 9 and 10: Project No. C-28(492) applicable) a
Page 11 and 12: Project No. C-28(492) SURETY BOND K
Page 13 and 14: SPECIAL PROVISIONS Project No. C-28
Page 21 and 22: Project No. C-28(492) SUPPLEMENTAL
Page 23: Project No. C-28(492) SUPPLEMENTAL
Page 27 and 28: SUPPLEMENTAL SPECIFICATIONS 16. SEE

OFFICE OF THE CITY CLERK OF OMAHA - Douglas County

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