Section 217 Section 217 12-inch centers and longitudinal laps on 36-inch centers. Each strip of material shall be stapled in three rows at the edges and center with staples spaced not more than three feet longitudinally. The staples shall anchor the fabric netting. Check slots, a row of staples on 12-inch centers perpendicular to the flow lin e, shall be installed at 50-foot intervals. On the downstream end of a d itch liner adjoining a structure, the anchor trench shall be omitted and the material folded under six inches and butted tightly against the structure and one row of staples installed on six-inch centers. An edge adjacent to a paved ditch shall be butted tightly against the paved ditch and a row of staples installed on 12-inch centers. All staples shall be driven flush with the soil surfaces. Ditch liner materials used on areas other than ditches may be placed e ither horizontally or vertically. Adjacent strips of excelsior blanket material sh all be butted tightly together and secured with a common row of staples rather than lapped as set forth for ditch installation. The staples shall be spaced on thre e-foot centers or less as determined by the Engineer based on field conditions. The excelsior blanket and erosion control blanket shall be placed with the fabric net facing up.
217.03.2 Protection and Maintenance . The Contractor shall maintain and protect the
ditch liner until release of maintenance or until the Engineer has determined that the liner has served its useful life, whichever occurs first. Maintenance shall consist of repairs necessitated by erosion, wind, fire, or other cause.
217.04 Method of Measurement . Ditch liner will be measur ed by the square yard of
surface area covered. Any over width of materi al installed wider than ordered, laps and anchor slots will not be measured for payment. 217.05--Basis of Payment . Ditch liner, measured as prescribed above, will be paid for at the contract unit price per square yard and shall be full compensation for completing the work. Payment will be made under: 217-A: Ditch Liner - per square yard SECTION 218 - BITUMINO US TREATED ROVING
218.01 Description. This work consists of furnishing and installing a layer of
bituminous treated roving to stabilize newly pl anted soil areas in ditches and on slopes in accordance with these specifications and at locatio ns shown on the plans or as directed by the Engineer.
218.02 Materials.
218.02.1 General. The type of roving material, fiberglass or polypropylene, shall be at
the option of the Contractor unless otherwis e specified and shall meet the applicable requirements of Subsection 715.09.6. The glass fibers or fibrillated polypropylene yarn shall be wound onto cylindrical packages so that the roving can be continuously fed through an ejector driven by compressed air and expanded into a mat. The fibers or yarn shall be lightly bound together in a ribbon form, without the use of clay, starch, or other deleterious substances. The material shall not contain petroleum solvents, or other agents known to be toxic to plant or animal life. The roving material shall not be expo sed to moisture prior to placement.
218.02.2 Bituminous Material . The bituminous material used for securing the roving
to the existing soil shall be Emulsified Asphalt, Grade SS-1, meeting the requirements of Subsection 702.07.
218.03 Construction Requirements.
218.03.1 Equipment. An air compressor shall be used in conjunction with applying the
glass fiber or polypropylene yarn. The compressor shall be capable of supplying 40 cubic feet of air per minute at a pressure of 80 to 100 pounds per square. An air gun specifically designed for spraying glass fibers or polypropylene yarn, sufficient 3/8-inch rubber hose for application, and at least one container shall be furnished for applying the material. Three spools or packages may be run simultaneously from a 125-cubic foot compressor. Equipment that cuts or breaks the roving will not be permitted. Equipment for applying the asphalt shall be capable of a pplying the material in a uniform spray at the rate specified.
218.03.2 General. The bituminous treated roving shall be applied over designated areas
within 24 hours following the planting or seed ing operations. The designated areas shall be free of all objects including the vegetative material for mulch that would keep the roving material from being in direct cont act with soil throughout the entire area to be treated. The upgrade and downgrade ends of the bitumi nous treated roving shall be buried in a six-inch minimum vertical slot and the soil tamped firmly against it. The bituminous treated roving shall be applied uniformly over the planted areas at one of the following rate with a ±20% tolerance:
a.Bituminous Treated Fiberglass Roving ..................... 0.50 pounds per square yard
b.Bituminous Treated Polypropylene Roving .............. 0.20 pounds per square yard The rate of distribution will be determined from the number of spools or packages of roving used on each area and the average weight of the spools or packages. A sample of at least five spools or packages designated at random by the Engineer will be taken and weighed and the average weight to the nearest pound per spool or package will be used for the truckload from which the sample was taken. Immediately following the spreading of roving, the asphaltic material shall be applied uniformly over the roving at the rate of 0.50 gallons per square yard with a ±20% tolerance. The Contractor shall be required to apply additional asphaltic material, if needed, to penetrate through the roving in sufficient quantity to secure the roving to the soil.
218.03.3 Protection and Maintenance . The Contractor shall maintain and protect the
bituminous treated roving mat until release of maintenance or until the Engineer has determined that the mat has served its useful life, whichever occurs first. Maintenance shall consist of repairs made necessary by erosion, wind, fire, or any other cause.
218.04 Method of Measurement . Bituminous treated roving will be measured by the
square yard of surface area covered. The additional materials required for terminal slots and materials placed outside the limits of the designated area(s) requiring treat ment will not be measured for payment.
218.05 Basis of Payment. Bituminous treated roving, measured as prescribed above,
will be paid for at the contract unit price per square yard, which shall be full compensation for co mpleting the work. Payment will be under: 218-A: Bituminous Treated Roving - per square yard SECTION 219 - WATERING
219.01 Description . This work consists of furnishing, transporting, and applying water
as specified during the planting operations and establishment of roadside vegetation excluding seeding. It shall be understood that watering will be measured and paid for only when ordered by the Engineer and used for items specified and when a pay item is included in the contract.
219.02 Materials . Water shall be as specifi ed in Subsection 714.01.5.
219.03 Construction Requirements . Loading operations on the roadway resulting in
water-logging or excessively wet basement soils, design soils, or base courses will not be permitted. Water shall be applied in the manner and quantities, at the times, and for the purposes set forth in the contract or directed. The quantities of watering shown in the contract are estimated for bidding purposes only and these quantities may be varied dependent upon need or may be omitted entirely with no adjustment in unit contract price. The equipment furnished and used for this work shall be approved as adequate and suitable for the purpose used.
219.04 Method of Measurement . The quantity of water furnished and applied as
directed or permitted will be measured to the nearest one thousand gallons (M gallons) by approved meters, measured tanks, or calibrated tanks. In accordance with the intent of Subsection 109.01, the capacity of tanks may be made by weight and converted to one thousand gallons (M gallons) by dividing the weight in pounds by 8,330.
Source: Mississippi Standard Specifications for Road and Bridge Construction, 2017 Edition. Pages 157–158 of 1,113.