Section 228 Section 228 On long slopes, an intermediate anchor trench shall be installed at 50-foot intervals.
228.03.3 Placement of Blanket. Starting at the crest of the slope, the erosion control
blanket shall be rolled down the slope in a controlled manner. Approximately every 25 feet, the erosion control blanket shall be pulled to take out any excess slack. The goal is to have the erosion control blanket contour and initiate full contact with the soil. The typical installation will require one stake pl aced at 3-foot to 5-fo ot intervals along the vertical length of the erosion control blanket. Stakes shall be staggered 18 to 24 inches horizontally across the erosion control blanket. If the erosion control blanket needs to be spliced in the middle of a slope, the erosion control blanket shall be "shingled" with up- slope erosion control blanket overlapping the down-slope erosion control blanket. There should be a minimum of six inches of overlap in a splice. The joint splice shall be made by placing a row of stakes six inches on cent er and then placing a second row of stakes six inches on center, staggered from the first row. All overlaps and the edges shall be secured with stakes. All longitudinal and tran sverse laps shall be a minimum 6-inch joint with the upgrade section on top. All transverse laps shall be staked with two staggered rows of stakes on 6-inch centers. All longitudinal laps shall be stakes with two staggered rows on 3-foot to 5-foot centers. The staking shall firmly anchor the fabric netting to the soil surface. On the downstream end of blankets adjoining a structure, the anchor trench shall be omitted and the material folded six inches and butted tightly against the structure and one row of stakes installed on six-inch centers. An edge adjacent to a paved ditch shall be butted tightly against the paved ditch and a row of stakes installed on 12-inch centers. All stakes shall be driven flush with the soil surfaces.
228.03.4 Protection and Maintenance. The Contractor shall maintain and protect the
blankets until release of maintenance or until the Engineer has determined that the blankets have served their useful life, whichever occurs first. Maintenance shall consist of repairs necessitated by erosion, rain, wind, fire, or other cause.
228.04 Method of Measurement. Erosion control blankets of the type specified will be
measured by the square yard of surface ar ea covered. Any over width of material installed wider than ordered, laps, and anchor slots will not be measured for payment.
228.05 Basis of Payment. Erosion control blankets, measured as prescribed above, will
be paid for at the contract unit price per square yard, which price shall be full compensation for all materials, equipment, la bor, maintenance and all work necessary to complete the work. Payment will be made under: 228-A: Erosion Control Blanket, Type - per square yard SECTION 229 - EROSION MATS
229.01 Description. This work consists of furnishing and installing erosion mats to
protect slopes, ditches, etc. from scour and erosion. The mats shall be installed at locations shown on the plans in reasonably close conformity with the lines, grades and dimensions shown on the plans or as directed by the Engineer.
229.02 Materials. Erosion mats shall be UV stabilized mat constructed of plastics,
composites, polymers, rubber, precast concrete , or cast-in-place concrete. Erosion mats will be used as an erosion preventer for ditches, slopes, and other locations shown on the plans. Erosion mats shall be one from the Department’s APL. The mat shall be visually inspected and appr oved by the Engineer prior to use. Once approved by the Engineer, the mat may be incorporated into the work.
229.03 Construction Requirements. Erosion mats shall be installed in accordance
with the plans and manufacturer's guidelines including any underlayment. The anchor system shall be sufficient to anchor the mat to the ground surface. The installation area shall be graded to a level, smooth surface to avoid water concentration and to create an appropriate base for the erosio n mat. Seed and fertilizer shall be placed on the prepared surface prior to the installation of the erosion mat.
229.04 Measurement. Erosion Mat will be measured by the square yard.
If required, seed and fertilizer will be meas ured and paid under their appropriate pay items. 229.05--Basis of Payment. Erosion Mat, measured as pres cribed above, will be paid for at the contract unit price per square yard, which price shall be full compensation for all labor, materials, tools, equipment, underlayment, anchor system, concrete, and all incidentals necessary to complete the work. Payment will be made under: 229-A: Erosion Mat - per square yard SECTION 230 - TREE AND SHRUB PLANTING
230.01 Description . Tree and shrub planting consists of furnishing, delivering, planting
and establishing trees and shrubs of the type s, species, and sizes indicated in accordance with these specifications and in reasonably close conformity with the locations shown on the plans or as directed.
230.02 Materials .
230.02.1 Quality of Plant Materials . Unless otherwise specified, all trees and shrubs
shall be nursery grown stock, strong, healthy, clean, well grown, and free from damage, insects, diseases, or rodents. They shall be root pruned and typical of the species. They shall possess a healthy, normal, and fibrous root system of sufficient size to ensure plant growth. The branch system shall be of normal development and reasonably free from broken terminal growth or other objectionable disfigurements. Trees shall have reasonably straight stems, shall be well branched and symmetri cal in accordance with their natural habits of growth, and shall be approved by a representative of the