873 the germination of seed nor inhibit plant grow th. Temporary matting shall gradually deteriorate with no adverse environmental effects.
715.24.2 Permanent Erosion Matting: The matting shall consist of a machine produced
mat of 100% ultraviolet stabilized polymeric or other suitable fibers resistan t to degradation and having uniform thickness and mass per unit area throughout. The matting shall conform to the following: Property 1 Test Method Type A Type B Type C Minimum Mat Thickness ASTM D1777 0.35 in ches 0.50 in ches 0.50 i nches Minimum (Wide Width) Tensile Strength ASTM D4595 145 x 110 lb/ft 170 x 130 lb/ft 3100 x 2000 lb/ft Maximum Elongation ASTM D4595 50% 50% 50% Minimum Porosity (Calculated) 95% 95% 95% Resiliency ASTM D1777 80% 80% 80% Ultraviolet Stability ASTM D4355 80% 80% 80% 1 Property values are reported as minimum average roll values (MARV) Tractive Force (Shear Stress) Performance Specification : Type A Matting – shall have the ability to prevent soil loss where the maximum channel shear stress ranges from 0 -4 lb/ft2 in a vegetated state, at 0.5 hours peak flow duration. Type B Matting – shall have the ability to prevent soil loss where the maximum channel shear stress ranges from 0 -6 lb/ft2 in a vegetated state, at 0.5 hours peak flow duration. Type C Matting – shall have the ability to prevent soil loss where the maximum channel shear stress ranges from 0 -8 lb/ft2 in a vegetated state, at 0.5 hours peak flow duration.
715.24.3 Acceptance: Acceptance of temporary erosion control matting shall be based
upon the manufacturer ’s written certification that the erosion control mat used is well suited to the particular site to be protected and upon the Division's visual inspection of the material. Acceptance of permanent erosion control matting shall be based upon certified test data with each shipment of matting. Compliance of this data with the requirements specified will be the basis of acceptance.
715.25 Ground Agricultural Limestone :
Ground agricultural limestone shall consist of high calcitic or dolomitic limestone containing not less than 85% of total calcium and magnesium car bonates, ground to such fineness and clearly labeled in accordance with the requirements of the West Virginia Department of Agriculture. Ground agricultural limestone shall be furnished and used in accordance with State Laws. Suppliers must be registered with the West Virginia Department of Agriculture.
715.26 Fertilizers :
874 Commercial fertilizers shall be supplied separately or in mixtures containing the specified percentages of total nitrogen, available phosphoric acid, and water soluble potash. Fertilizer shall be furnished in standard containers with weight, name of plant nutrients and guaranteed percentages, clearly marked, all in accordance with governing State and Federal laws. Brands must be regi stered with the West Virginia State Department of Agriculture.
715.26.1 Fertilizer for Seeding: Fertilizer for seeding shall consist of any type with a 1 -
2-1 ratio providing the minimum nutrient equivalent specified. Urea formaldehyde fertilizer shall contain a minimum of 38 percent (38%) slowly available nitrogen. Commercial fertilizer for seeding may be supplied in any of the following forms, subject to the approval of the Engineer.
i.A dry, free flowing fertilizer that may be applied by ordinary agr icultural spreaders. ii. A fertilizer which is water soluble or one which will permit complete suspension of insoluble particles in water, applicable to hydraulic methods of application.
715.26.2 Fertilizer for Landscape Planting: The fertilizer shall be a co -granulated
magnesium ammonium phosphate and magnesium potassium phosphate, controlled release, inorganic fertilizer compound (coarse grade). It shall have a guaranteed minimum analysis of: Percent Nitrogen ................................ ................................ ................................ ....7 Maximum water soluble ammoniacal nitrogen ................................ ......... 2 Minimum water insoluble ammoniacal nitrogen ................................ ......5 Phosphoric acid (available P 2O5) ................................ ............................ 40 Potash(K 2O) ................................ ................................ .............................. 6
715.27 Mulch Material :
715.27.1 Mulch Material for Seeding:
715.27.1 1-Straw Mulch: Straw mulch for seeding shall include baled wheat or oats
straw, or baled grass hay. Alfalfa, clover and salt grass hay are not acceptable. Straw mulch shall be dry and reasonably free from weeds, sticks, or other forei gn material. Acceptance shall be based on the Division's visual inspection of the material.
715.27.1 2-Wood Cellulose Mulch: Mulch for use with the hydraulic application of
grass seed shall consist of wood cellulose fiber. It shall contain no growth o r germination inhibiting factors and shall be dyed green. When the material is agitated in slurry tanks with fertilizers, grass seed, water and other approved additives, the fibers shall become uniformly suspended to form a homogeneous slurry. The hydrau lically sprayed slurry shall form a blotter -like ground cover impregnated with grass seed. The ground cover shall permit the absorption of water and allow rainfall or mechanically applied water to percolate to the underlying soil.
Source: West Virginia Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 895–896 of 1,006.