Section 4169. Erosion Control Materials
All materials required to be furnished and described in this section.
A. Furnish seeds approved for use according to requirements of this section, including specified purity and germination, as shown in Tables 4169.02-1 and 4169.02-2.
|
Table 4169.02-1: Seeds (Common Names, Scientific Names, Purity, and Germination) |
|||
|
Common Name |
Scientific Name |
Purity (%) |
Germination (%) |
|
DOMESTIC GRASSES Bluegrass, Kentucky Bluegrass, Ky. RAM-1 Bluegrass, Ky. PARK Brome, smooth-LINCOLN Fescue, tall, FAWN Fescue, chewings, red Fescue, creeping, red Fescue, red-PENNLAWN Fescue, Tall, Olympic (Fineleaf) Fescue, Tall, Rebel (Fineleaf) Fescue, Sheeps Orchardgrass Red top Reed Canarygrass Wildrye, Canada Wildrye, Russian Ryegrass, Perennial Timothy |
Poa pratensis Poa pratensis-RAM-1 Poa pratensis-PARK Bromus inermis Festuca arundinacea-FAWN Festuca rubra var. commutate Festuca rubra Festuca rubra PENNLAWN Festuca arundinacea-Olympic Festuca arundinacea Festuca ovina Dactylis glomerata Agrostis alba Phalaris arundinacea Elymus Canadensis Elymus junceus Lolium perenne Phleum pratense |
85 95 95 90 98 98 98 98 98 98 98 90 92 98 95 95 95 99 |
80 85 85 85 85 90 85 85 85 85 85 90 85 70 85 85 90 85 |
|
LEGUMES Alfalfa, RANGER/VERNAL Alfalfa, Travois Birdsfoot Trefoil EMPIRE Crownvetch, Emerald Hairy Vetch Lespedeza, Korean Red Clover, medium Alsike Clover White Clover |
Medicago sativa Medicoa spp. Lotus corniculatus Coronilla varia Vicia villosa Lespedeza stipulacea Trifolium pretense Trifolium hybridum Trifolium repens |
99 99 98 98 96 98 99 99 98 |
90(a) 90(a) 85(a) 70(a) 85(a) 80(a) 90(a) 90(a) 90(a) |
|
NURSE CROP OR STABILIZING CROP Oats Rye Sudangrass, PIPER |
Avena sativa Secale cereale Sorghum vulgare var. sudanese |
97 97 98 |
90 90 85 |
|
(a) Includes hard seed. |
|||
|
Table 4169.02-2: Seeds (Common Names, Scientific Names, and PLS) |
||
|
Common Names |
Scientific Names |
PLS (%) |
|
*Furnish seed certified as Source Identified Class (Yellow Tag) Source G0-Iowa.
NATIVE GRASSES Big Bluestem* Little Bluestem* Switchgrass* Indiangrass* Sideoats Grama* Western Wheatgrass* Buffalograss* Sand Bluestem*
Blue Grama Intermediate Wheatgrass Slender Wheatgrass
Prairie Dropseed Sand Dropseed Sand Lovegrass Weeping Lovegrass Hairy Wood Chess Blue-joint grass Bottlebrush sedge Tussock sedge Fox sedge Virginia wild-rye Reed manna grass Fowl manna grass Common rush Rice Cut Grass Rye grass, annual Fowl bluegrass Green bulrush Wool grass Soft-stem bulrush Indian grass Spike Rush |
Andropogon gerardii Andropogon scoparius Panicum virgatum Sorghastrum nutans Bouteloua curtipendula Agropyron smithii Buchloe dactyloides Andropogon gerardii, var. paucipilus Bouteloua gracilis Agropyron intermedium Agropyron trachycaulum, var. unilaterale Sporobolus heterolepis Sporobolus cryptandrus Eragrostis trichodes Eragrostis curvula Bromus purgans Calamagrostis Canadensis Carex comosa Carex stricta Carex vulpinoidea Elymus virginicus Glyceria grandis Glyceria striata Juncus effuses Leesia oryzoides Lolium italicum Poa palustris Scirpus atrovirens Scirpus cyperinus Scirpus vallidus Sorghastrum nutans Eleocharis palustris |
30 30 63 30 30 56 60 30
30 70 70
65 65 65 65 60 47 62 78 64 60 50 72 80 62 89 72 45 78 78 60 71 |
|
FORBS Canada anemone Marsh milkweed New England aster Swamp aster Showy tic-trefoil Joe-pye weed Boneset Ox Eye sunflower Blue-flag iris Meadow blazingstar Tall blazingstar Great blue lobelia Reed manna grass Fowl manna grass Common Rush Rice Cut Grass |
Anemone Canadensis Asclepias incarnate Aster novae-angliae Aster puniceus Desmodium canadense Eupatorium maculatum Eupatorium perfoliatum Heliopsis helianthoides Iris virginica-shrevii Liatris ligulistylis Liatris pycnostachya Lobelia siphilitica Glyceria grandis Glyceria striata Juncus effuses Leesia oryzoides |
72 25 25 25 25 66 41 38 19 24 24 13 50 72 80 62 |
B. Furnish all seeds, including grass, legume, forbs, and cereal crop seeds, from an established seed dealer or certified seed grower. Ensure they meet requirements of the Iowa Department of Agriculture regulations (Iowa Seed Law) and are labeled accordingly. Ensure the test date to determine the percentage of germination requirement was completed within a 9 month period exclusive of the calendar month in which the test was completed. Ensure the seed analysis on the label is mechanically printed.
C. Approval of all seed for use will be based on the accumulative total of PLS specified for each phase of the work, so that the PLS is not less than the accumulative total of the PLS specified. PLS is obtained by multiplying purity times germination.
D. If the seed does not comply with minimum requirements for purity and germination and such seed cannot be obtained, the Engineer may approve use of the seed on a basis of PLS or may authorize a suitable substitution for the seed specified.
E. The accumulative total of Pure Live Seed (PLS) is the product obtained by multiplying the pounds (kilograms) of each seed by the purity and germination percentages expressed as decimals. Calculations will be based on test results of samples taken by the Contracting Authority. If the seeds were not sampled or if these test results are not available, the PLS will be calculated from information shown on the label.
Furnish fertilizer of the grade, type, and form specified and that complies with Iowa Department of Agriculture rules and the following requirements:
A. Fertilizer grade will be identified according to the percent nitrogen (N), percent available phosphoric acid, (P2O5), and percent water soluble potassium, (K2O), in that order. Approval will be based on that identification.
B. Furnish all fertilizer from an established fertilizer dealer. Ensure guaranteed analysis is provided either through mechanically printed commercial fertilizer bags or through a manufacturer's (not a distributor's) bill of lading.
C. Fertilizer inspection and acceptance will be according to Materials I.M. 469.03.
D. Furnish fertilizer of a type that can be uniformly distributed by the application equipment. Fertilizer may be chemically combined or may be furnished as separate ingredients. If supplying chemically combined fertilizer, have each unit of fertilizer chemically combined. Ensure the manufacturer’s guarantee indicates compliance with this agreement. If supplying fertilizer as separate ingredients, comply with the following:
· Each of the separate ingredients of uniform size,
· Analysis guaranteed by the manufacturer.
· Mixed using a drum mixer, grinder mixer, or other mechanical mixers.
· Mixed only by the fertilizer dealer.
E. When 6-24-24 chemically combined commercial fertilizer has been specified, a combination of ammoniated phosphate (either monoammonium phosphate (11-52-0) or diammonium phosphate (18-46-0)), muriate of potash (granular form), and urea (granular form) may be used.
F. When 13-13-13 chemically combined commercial fertilizer has been specified, a combination of ammoniated phosphate (either monoammonium phosphate (11-52-0) or diammonium phosphate (18-46-0)), muriate of potash (granular form), and urea (granular form) may be used.
G. Fertilizer may be furnished in a dry or liquid form.
H. Furnish a list of the number of containers and a corresponding scale ticket from an approved scale for the fertilizer to be used in the work.
I. Official samples taken by the Contracting Authority may be tested. A tolerance of minus 1.0 percentage point from the guaranteed analysis for each nutrient will be considered substantial compliance.
J. Ground limestone is to be of the type known as No. 1 fine (70% passing No. 200 (75 µm) sieve) with an analysis of elemental calcium of no less than 37% or no more than 40%.
4169.04 INOCULANT FOR LEGUMES.
An inoculant is a culture of bacteria specifically formulated for legume seeds (alfalfa, clovers, lespedeza, birdsfoot trefoil, hairy vetch, and crownvetch). Ensure the manufacturer's container indicates the specific legume seed to be inoculated and the expiration date. Use inoculant that meets the requirements of the Iowa Seed Law. Follow the safety precautions specified on the product label.
A sticking agent is a commercial material recommended by the manufacturer to improve adhesion of inoculant to the seed. For quantities less than 50 pounds (25 kg), the sticking agent need not be a commercial agent; however, the Engineer’s approval is required. Apply separately prior to application of inoculant. Follow safety precautions specified on the product label. A sticking agent is not required if a liquid formulation of inoculant is used.
A. Use sod consisting of approximately 1 inch (25 mm) of well established turf consisting of live Kentucky bluegrass, unless otherwise specified. Ensure sod is free from roots of trees or brush, stones, and other objectionable materials. Ensure sod is free from all noxious weeds and reasonably free of all other weeds.
B. Ensure sod is cut in strips of uniform width and thickness with ends square. The Engineer may order the thickness adjusted to meet the sod conditions. Cut sod to the length specified for the use intended. If not specified, cut to a minimum length of 3 feet (1 m). Mow sod areas to a height of approximately 1 1/2 inches (40 mm) to 2 inches (50 mm) prior to cutting.
C. Ensure sod was regularly maintained prior to cutting. Apply pre-emergence weed control chemicals and weed control chemicals for broadleaf weeds.
D. Roll or stack sod within 1 hour after being cut. The Engineer may approve other methods of handling sod. Take precautions to prevent drying or heating. Do not use sod damaged by heat or dry conditions, or sod cut more than 18 hours before being incorporated into the work.
E. Sod will be subject to inspection by the Engineer at the job site, and approval of the work constitutes approval of the material.
Material used as mulch may consist of dry cereal straw or native grass straw. Use Certified Noxious Weed Seed Free Mulch certified by the Iowa Crop Improvement Association or other state’s Crop Improvement Associations.
1. Wood Cellulose Fiber.
a. Natural or cooked cellulose fiber processed from whole wood chips, or a combination of (50%-50%) cellulose fiber produced from whole wood chips and recycled fiber from sawdust, recycled paper, chipboard, or corrugated cardboard.
b. Contains a colloidal polysaccharide tackifier adhered to the fiber to prevent separation during shipment and avoid chemical coagglomeration during mixing.
c. Forms a homogeneous slurry of fibers, tackifier, and water that can be applied with standard hydraulic mulching equipment and be dyed green to facilitate visual metering during application.
d. Contains no growth or germination inhibiting factors, and has a minimum pH of 4.8.
2. Bonded Fiber Matrix.
a. Long-strand wood fibers held together by organic tackifiers and bonding agents that, when dry, become insoluble and non-dispersible.
b. Upon curing (24 to 48 hours) forms a continuous, 100% coverage, flexible, absorbent, erosion-resistant blanket that encourages seed germination.
c. Manufactured to be applied with standard hydraulic mulching equipment and dyed green to facilitate visual metering during application.
d. Contains no growth or germination inhibiting factors.
e. Physical Properties:
1) Fibers: Virgin wood, greater than 88% by volume.
2) Organic Material: Greater than 96% by volume.
3) Tackifier: 8 to 10%.
4) pH: 4.8 minimum.
5) Moisture Content: 12% ±3%.
6) Minimum Water Holding Capacity: 1.2 gallons per pound (10 L/kg).
f. All components pre-packaged by manufacturer to ensure material performance and compliance. Field mixing of additives or any components will not be allowed.
g. Other products not meeting requirements of Article 4169.07, B, 2, e, may be approved if they meet the following requirements:
1) Contain non-toxic tackifiers that upon drying become insoluble and non-dispersible to eliminate direct raindrop impact on soil according to ASTM D 7101 and EPA 2021.0-1.
2) Contain no germination or growth inhibiting factors and do not form a water-resistant crust that can inhibit plant growth.
3) Hydraulic mulch that is completely photo-degradable or biodegradable.
4) Contain a minimum 90% organic material according to ASTM D 2974.
5) Have a rainfall event (R-factor) of 140 < R according to ASTM D 6459.
6) Have a cover factor of C ≤ 0.03 according to ASTM D 6459.
7) Vegetation Establishment of 400% minimum according to ASTM D 7322.
8) Water Holding Capacity 600% minimum according to ASTM D 7367.
3. Mechanically-Bonded Fiber Matrix.
a. Long-strand wood fibers and crimped, interlocking synthetic fibers.
b. Upon curing (2 hours) forms a continuous, 100% coverage, flexible, absorbent, porous, erosion-resistant blanket that encourages seed germination.
c. Manufactured to be applied with standard hydraulic mulching equipment and dyed green to facilitate visual metering during application.
d. Contains no growth or germination inhibiting factors.
e. Physical Properties:
1) Virgin Wood Fibers: 73% minimum.
2) Crimped, Interlocking Synthetic Fibers: 5% ±1%.
3) Tackifier: 10% ±1%.
4) Moisture Content: 12% ±3%.
5) Minimum Water-Holding Capacity: 1.2 gallons per pound (10 L/kg).
6) pH: 4.8 minimum.
f. All components pre-packaged by manufacturer to ensure material performance and compliance. Field mixing of additives or any components will not be allowed.
g. Other products not meeting requirements in Article 4169.07, B, 3, e, may be approved if they meet the following requirements:
1) Contain non-toxic tackifiers that upon drying become insoluble and non-dispersible to eliminate direct raindrop impact on soil according to ASTM D 7101 and EPA 2021.0-1.
2) Contain no germination or growth inhibiting factors and do not form a water-resistant crust that can inhibit plant growth.
3) Hydraulic mulch that is completely photo-degradable or biodegradable.
4) Contain a minimum 90% organic material according to ASTM D 2974.
5) Have a rainfall event (R-factor) of 175 < R according to ASTM D 6459.
6) Have a cover factor of C ≤ 0.01 according to ASTM D 6459.
7) Vegetation Establishment of 500% minimum according to ASTM D 7322.
8) Water Holding Capacity of 700% minimum according to ASTM D 7367.
A. Use an organic substance produced by the biological and biochemical decomposition of source-separated compostable materials separated at the point of waste generation. Organic substances may include, but are not limited to:
· Leaf and yard trimmings,
· Food scraps,
· Food processing residues,
· Manure and/or other agricultural residuals,
· Forest residues and bark, and
· Soiled and/or unrecyclable paper and biosolids.
B. Compost is to contain no visible admixture of refuse or other physical contaminants nor any material toxic to plant growth. Compost is to meet the additional requirements below. All physical requirements are to comply with the United States Composting Council, “Testing Methods for the Examination of Composting and Compost” (TMECC).
1. Minimum organic material: 30% (dry weight (mass) basis) as determined by loss on ignition.
2. Moisture content: 30% to 60%. Organic material shall be loose and friable and not dusty.
3. Soluble salts: less than 5.0 ds/m.
4. Stability: Carbon dioxide evolution rate less than 8 according to TMECC 5.08-B. Growth screening: Emergence a minimum of 80% for all compost to be vegetated.
5. pH: 6.0 - 8.0.
6. Fecal Coliform: Comply with TMECC 07.01-B.
7. Heavy Metals: Comply with TMECC 04.06 and TMECC 04.13-B.
8. Comply with the following for particle size:
· Pneumatic Seeding (Urban): 100% passing the 1/2 inch (12.5 mm) screen.
· Pneumatic or Mechanical Seeding (Rural): 100% passing the 1 inch (25 mm) screen, 80% to 90% passing the 3/4 inch (19 mm) screen, and 70% to 80% passing the 1/2 inch (12.5 mm) screen.
· Filter Sock, Filter Berm, and Filter Blanket: 100% passing the 2 inch (50 mm) screen, 70% to 90% passing the 1 inch (25 mm) screen, and 50% to 70% passing the 1/2 inch (12.5 mm) screen.
4169.09 STAKES FOR HOLDING SOD.
Use either wood or metal wire stakes for holding sod. Use wood stakes in sandy soils or when the Engineer requires.
· 1 inch (25 mm) to 1 1/2 inches (40 mm) wide, 1/4 inch (6 mm) to 1/2 inch (13 mm) thick, and 12 inches (300 mm) long.
· Where this length of stake does not provide firm bearing, the Engineer may require stakes of sufficient length to secure firm bearing.
· Staples made from No. 11 (3.06 mm diameter) wire or heavier and with a minimum 2 inch (50 mm) flat spread on the top of the sod.
· Legs at least 6 inches (150 mm) long. The Engineer may require wire legs longer than 6 inches (150 mm).
4169.10 SPECIAL
DITCH CONTROL, turf reinforcedment mat, AND
SLOPE PROTECTION, and Outlet or channel scour
protection (transition mat).
For
plastic netting, wood excelsior mat, coconut fiber mat, straw-coconut mat,
straw mat, and wire staples, cComply
with the following and meet the requirements of
Materials I.M. 469.10.
Meet the following requirements for wire staples for holding special ditch control wood excelsior mat and special ditch control jute mesh over sod:
1. U-shaped wire staples.
2. Each leg a minimum of 6 inches (150 mm) long. In sandy soil conditions the Engineer may require the length of each leg to be a minimum of 12 inches (300 mm).
3. No. 11 (3.06 mm) diameter wire.
4. Staples of sufficient hardness to facilitate installation without bending.
1. Wood Excelsior Mat.
A mat of interlocking wood fibers. Meet the following requirements:
· Plastic netting applied to both sides for holding the excelsior in place.
· Nontoxic to growth of plants and germination of seeds.
· Minimum dry weight (mass) of 0.68 pounds per square yard (334 g/m2) according to ASTM D 6475.
· Furnished in rolls with a uniform width of 48 inches (1.2 m), with a tolerance of minus 1 inch (25 mm) and a minimum length of 80 feet (24 m).
· Furnished in plastic bags or otherwise protected to prevent damage from weather and handling.
2. Coconut Fiber Mat.
At the Contractor's option, coconut fiber mat may be substituted for wood excelsior mat for special ditch control. Meet the following requirements:
· Uniform thickness with the coconut fiber evenly distributed over the entire area of the mat.
· Both sides of the mat covered with polypropylene netting attached with cotton thread.
· Minimum dry weight (mass) of 0.40 pounds per square yard (182 g/m2) according to ASTM D 6475.
· Furnished in rolls with a uniform width of 48 inches (1.2 m) with a tolerance of minus 1 inch (25 mm) and a minimum length of 80 feet (24 m).
· Furnished in plastic bags or otherwise protected to prevent damage from weather and handling.
Wood excelsior mat, coconut fiber mat, straw mat, or straw coconut mat may be used for slope protection.
1. Wood Excelsior Mats.
A mat of interlocking wood fibers meeting the requirements of Article 4169.10, B, 1. with the following exceptions:
· Plastic netting applied to one or both sides for holding the excelsior in place. Mats without netting where the excelsior is mechanically stitched together to hold it in place may be allowed.
· Minimum dry weight (mass) of 0.50 pounds per square yard (246 g/m2) according to ASTM D 6475.
2. Straw Mat, Straw-Coconut Fiber Mat, or Coconut Fiber Mat.
At the Contractor's option straw mat, straw-coconut fiber mat, or coconut fiber mat may be substituted for wood excelsior mat for slope protection. Meet the following requirements:
· Consistent thickness with the straw, straw-coconut fiber, or coconut fiber evenly distributed over the entire area of the mat.
· The top side of the mat covered with polypropylene netting attached with cotton thread.
· Minimum dry weight (mass) of 0.40 pounds per square yard (182 g/m2) according to ASTM D 6475.
· Furnished in rolls with a uniform width of 48 inches (1.2 m), with a tolerance of minus 1 inch (25 mm) and a minimum length of 80 feet (24 m).
· Furnished in plastic bags or otherwise protected to prevent damage from weather or handling.
1. Comply with the following mesh netting sizes. A tolerance of plus or minus 0.10 inch (2.5 mm) applies to netting size.
· Netting applied on wood excelsior mats: no more than 1 inch by 2 inches (25 mm by 50 mm).
· Netting applied on coconut fiber only mats for channel and slope: no more than 3/4 inch by 3/4 inch (19 mm by 19 mm).
· Netting applied on the top side of straw and straw-coconut fiber mats for slopes only: no more than 1/2 inch by 1/2 inch (13 mm by 13 mm).
2. A minimum weight of 9 pounds per 1000 square yards (44 g/m2) is required for netting for special ditch control or slope protection.
E. Turf Reinforcement Mat (TRM).
1. Type 1 TRM: constructed of a web of mechanically or melt-bonded polymernetting, or monofilaments fibers entangled to form a strong and dimensionally stable mat. Bonding methods include polymer welding, thermal or polymer fusion, or the placement of synthetic fibers between two high-strength, biaxially-oriented nets, mechanically bound by parallel stitching with polyolefin thread. Products may contain a degradable component.
2. Type 2 and 3 TRM: constructed of a web of mechanically or melt-bonded polymer netting, or monofilaments, or fibers that are entangled to form a strong and dimensionally stable mat. Non-woven bonding methods include polymer welding, thermal or polymer fusion, or the placement of fibers between two high-strength, biaxially oriented nets, mechanically bound by parallel stitching with polyolefin thread. Components are to be 100% synthetic and resistant to biological, chemical, and ultraviolet degradation.
3. Type 4 TRM: a high performance/survivability TRM composed of monofilament yarns woven into a resilient uniform configuration. Use mats consisting of a matrix exhibiting very high interlock and reinforcement capacities with both soil and root systems and demonstrating a high tensile modulus. TRMs manufactured from discontinuous or loosely held together by stitched or glued, netting, or composites will not be allowed in this category. Components are to be 100% synthetic and resistant to biological, chemical, and ultraviolet degradation. Use this category when field conditions exist with high loading and/or high survivability requirements.
4. Comply with Table 4169.10-1 for minimum material property and performance requirements:
|
Table 4169.10-1: Minimum Material Property and Performance Requirements |
||||||
|
Property |
Property | Property | Type 1 | Type 2 | Type 3 | Type 4 |
|
Material |
Thickness |
ASTM D 6525 |
0.25 in (6.25 mm) |
0.25 in (6.25 mm) |
0.25 in (6.25 mm) |
0.25 in (6.25 mm) |
|
Material |
Tensile Strength(a, b) |
ASTM D 6818 |
125 lb/ft (186 kg/m) |
240 lb/ft (357 kg/m) |
750 lb/ft (1116 kg/m) |
3000 lb/ft (4465 kg/m) |
|
Material |
UV Resistance |
ASTM D 4355 |
80% @ 500 hrs |
80% @ 1000 hrs |
80% @ 1000 hrs |
90% @ 3000 hrs |
| Performance |
Maximum Shear Stress (Channel Applications)c |
ASTM D 6460 |
7-9 lb/ft2 (34.2 - 43.9 kg/m2) |
10-11 lb/ft2 (48.8 - 53.7 kg/m2) |
12-14 lb/ft2 (58.6 - 68.4 kg/m2) |
15-16 lb/ft2 (73.2 - 78.1 kg/m2) |
| Performance |
Maximum Slope Gradient (Slope Applications) |
N/A |
1:1 (H:V) or flatter | 1:1 (H:V) or flatter | 1:1 (H:V) or greater | 1:1 (H:V) or greater |
|
a. Minimum Average Roll Values, machine direction only. b. Tensile Strength of structural components retained after exposure. c. Maximum shear stress that fully-vegetated TRM can sustain without physical damage or excess erosion (1/2 inch (12.5 mm) soil loss) during a 30 minute flow event in large scale testing. Acceptable large scale testing protocol includes ASTM D 6460 or independent testing conducted by the Texas Transportation Institute, Colorado State University, Utah State University, or other approved testing facility. Bench scale testing is not acceptable. |
||||||
F. Outlet or Channel Scour Protection (Transition Mat)
1. Mat.
a. Constructed of 85% minimum UV resistant material with a maximum ground cover of 80%.
b. Meet the requirements of Table 4169.10-2:
|
Table 4196.10-2: Material Property and Performance Requirements |
||
|
Property |
Test Method |
Value |
|
Mass/Unit Area (max) |
ASTM D 6566 |
3 lbs/ft2 (15 kg/m2) |
|
Thickness (min) |
ASTM D 6525 |
0.4 in (10 mm) |
|
Thickness (max) |
ASTM D 6525 |
1.1 in (28 mm) |
|
Tensile Strength (TD) |
ASTM D 6818 |
550 lbs/ft (820 kg/m) |
|
Percent Open Area (min) |
ASTM D 6567 |
20% |
|
UV Stability |
ASTM D 4355 |
85% |
2. Anchoring Devices.
a. Furnish bullet tip style anchors made of a metal alloy attached to a wire rope.
b. Anchors capable of withstanding a minimum 300 pounds (136 kg) of pull out resistance in cohesive soils.
c. Wire rope a minimum of 30 inches (762 mm) in length with a minimum breaking strength of at least 300 pounds (136 kg).
d. The top washer a minimum of 3 inches (76 mm) in diameter and constructed of a UV resistant plastic.
e. Each anchor equipped to allow the retightening of the anchor when deemed necessary by the Engineer.
4169.11 Filter Fabric.
Furnish nonwoven polypropylene, UV stabilized filter fabric complying with Table 4169.11-1.
|
Table 4169.11-1: Filter Fabric Properties |
||
|
Property |
Typical |
Minimum |
|
Tensile Strength, lbs (metric) |
130 (metric) |
115 (metric) |
|
Grab Elongation, % |
70 |
50 |
|
Trapezoidal Tear Strength, lbs (metric) |
60 (metric) |
50 (metric) |
4169.12 Perimeter and Slope Sediment Control Device.
Wood excelsior or straw contained in a tube of photodegradable open weave fabric (synthetic netting).
Continuous, tubular, knitted photodegradable, synthetic mesh netting with a maximum 3/8 inch (10 mm) opening and filled with a compost/wood blend filter material consisting of compost from an approved source meeting Article 4169.08. Fill sock by blowing filter material into tube with a pneumatic blower truck or similar device. Hand filling will not be allowed.
C. Approved perimeter and slope sediment control devices are listed in Materials I.M. 469.10, Appendix E.