2612.01DESCRIPTION
Mow a strip of vegetation along the edges of shoulders, in the medians, and within designated interchange areas. Perform incidental hand mowing around obstacles. 2612.02 None.
MATERIALS.
2612.03
MOWING.
A.
Equipment. 1.
Use tractors with sickle type mowers, underbody rotary mowers, gang type rotary mowers, or other types the Engineer approves. Equip rotary mowers with a suction type blade and safety chains or other approved protective devices. Ensure sickle bar mowers have protective shields on all sections. Replace broken sections to ensure a clean, smooth cut. Make available on the project an extra set of operable blades to fit available equipment.
2.
Equip each tractor with an amber revolving light: • Visible from the front and rear, • Mounted at least 10 feet high as measured to the lamp axis, and • Flashes between 60 and 120 times per minute.
3.
In lieu of an amber revolving light, an amber strobe light may be used.
4.
Equip each tractor with a standard triangular slow moving vehicle emblem mounted 4 feet above the ground with a dimension of 13 1/2 inches per side, a red or fluorescent orange flag, and a rear view mirror. Locate as shown in the contract documents. Use a flag that is 16 inches by 16 inches minimum.
5.
Set mower cutting height so that, after completion of the mowing operation, the height of remaining stubble averages 6 inches ± 1 inch.
2612.03
B.
C.
Mowing
Types. 1.
General.
The Engineer will issue a Notice to Proceed to the Contractor for each mowing, based on the projected date when 50% of the vegetation will reach 14 inches.
edges of the shoulders and throughout the length of the project. This also includes outside and inside ramp shoulders.
2.
Metro Mowing.
contract documents. Approximate start dates are usually prior to Memorial Day, late June to early July, early to mid August (in a four mowing contract), and after Labor Day.
and in the median, mow all other accessible areas including foreslopes, backslopes, ditch bottoms, interchange areas, islands, and along fences.
3.
Spring and Fall Mowing.
the contract documents. Approximate start dates are usually prior to Memorial Day, late June to early July, early to mid August (in a four mowing contract), and after Labor Day.
4.
Fall Mowing.
Requirements. 1.
Prior to mowing, examine the area to be mowed for objects that may cause damage. Immediately remove objects thrown onto the roadway.
2.
Advance roadway warning signs will not be required.
3.
When not mowing, limit mowing equipment travel to the right hand shoulder of the main line pavement. Do not travel in the traffic lanes except to cross the pavement for purposes of mowing adjacent to the left shoulder.
4.
Do not use existing median crossovers. These are for emergency operations only. Confine turnarounds to interchanges.
5.
Unless specified otherwise in the contract documents, perform all work during the hours of 30 minutes after sunrise to 30 minutes before sunset.
Mowing
2612.04
6.
When mowing along the main line and right ramp shoulders, progress in the same direction as traffic. Mowing along the left ramp shoulder in the direction opposite the flow of traffic will be permitted if it can be accomplished without equipment using the left shoulder. Conduct mowing operations so that the equipment does not encroach on the traveled way. When mowing behind guardrail, the direction of travel may be opposite that of adjacent traffic.
7.
To avoid leaving a ragged appearance, set the speed of the mowing equipment not to exceed the ability of the mower to cut cleanly. Monitor the operation and maintain the cutting edges in a sharp condition or replace as necessary to prevent unmown strips (rooster tails) or damage to vegetation.
8.
Perform mowing in a single pass. If any unmown strip or damage to vegetation is encountered, immediately suspend the operation and take corrective measures, at no additional cost to the Contracting Authority. The Engineer may inspect cutting edges at any time. Additional mowing widths are permissible to take advantage of wider mowing equipment which may be difficult to modify to the required width. The Contractor will not be paid for this additional mowing width.
9.
The contract documents will specify the limits of mowing at interchanges and rest areas, if applicable. When more than one pass of the mowing equipment is required, lap successive passes to avoid leaving uncut vegetation. More than one pass of the mowing unit may be necessary to accomplish the mowing. Bunching or windrowing of the mowed vegetation will not be permitted.
equipment, and for trimming around and under delineator posts, sign posts, guardrail, bridges, culverts, or other obstructions. Complete the hand trimming within 3 working days after the adjacent area is mowed with the tractor. This may include hand pulling of weeds. At the direction of the Engineer, replace all roadside trees, shrubs, or appurtenances such as delineator posts, signs, tile systems, tile outlets, etc. damaged due to the mowing operations, at no additional cost to the Contracting Authority.
direction of the Engineer, repair rutting damage caused by the mowing operation.
the Interstate right-of-way only at locations designated by the Engineer. In no case will they be allowed closer than 50 feet from the shoulder. Parking of private vehicles within the Interstate right-of-way is prohibited.
2612.04METHOD OF MEASUREMENT
The area for Roadside Mowing, in acres, will be shown in the contract documents. The quantity will be based on main line, center line, and ramp base line stationing,
2612.05
Mowing
with the area calculated in. The length of shoulders at bridges will be deducted when calculating the quantity. The quantity at intersections of main line and ramp shoulders will be calculated so there will not be a deduction or a duplication of quantities. Additional mowing required around guardrails, obstacles, and median crossovers will not be measured separately. 2612.05
BASIS OF PAYMENT.
A.
Payment for Roadside Mowing will be the contract unit price per acre indicated in the contract documents.
B.
Payment is full compensation for mowing according to the contract documents, including: • Mowing around guardrails, signs, delineators, drainage structures, bridges, and in islands, and • Trimming with hand equipment.
C.
When the Engineer determines mowing is not necessary due to factors such as the lack of vegetation growth during drought conditions, but hand trimming is still required, payment will be 25% of the contract unit price per acre.
4100. General Provisions. 4101. Portland Cement. 4102. Water for Concrete and Mortar. 4103. Liquid Admixtures for Portland Cement Concrete. 4104. Burlap for Curing Concrete. 4105. Liquid Curing Compounds. 4106. Plastic Film and Insulating Covers for Curing Concrete. 4107. Plastic Film for Subgrade Treatment. 4108. Supplementary Cementitious Materials. 4109. Aggregate Gradations. 4110. Fine Aggregate for Portland Cement Concrete. 4111. Class L Fine Aggregate for Portland Cement Concrete. 4112. Intermediate Aggregate for Portland Cement Concrete. 4115. Coarse Aggregate for PC Concrete. 4116. Class V Aggregate for Portland Cement Concrete. 4117. Granular Leveling Material 4118. Bedding Material for Non-Primary Road Projects. 4119. Bedding and Backfill Material for Interstate and Primary Road Projects. 4120. Granular Surfacing and Granular Shoulder Aggregate. 4121. Granular Subbase Material. 4122. Crushed Stone Base Material. 4123. Modified Subbase Material. 4124. Aggregate for Slurry Mixtures. 4125. Aggregate for Bituminous Sealcoat. 4127. Aggregate for Flexible Paving Mixtures. 4128. Stabilization (Foundation) Material 4130. Revetment Stone, Erosion Stone, and Gabion Stone. 4131. Porous Backfill Material. 4132. Special Backfill Material. 4133. Granular Backfill Material. 4134. Floodable Backfill Material. 4136. Joint Fillers, Sealers, and Seals. 4137. Asphalt Binder. 4138. Cutback and Liquid Asphalts. 4139. Liquid Sealing Materials for PCC Surfaces. 4140. Emulsified Asphalt. 4141. Corrugated Steel Culvert Pipe. 4143. Subdrain Pipe. 4144. Structural Plates for Pipe, Pipe Arches, and Arches. 4145. Concrete Culvert Pipe. 4146. Plastic Pipe. 4147. Pipe and Manhole Rehabilitation Materials. 4148. Drain Tiles. 4149. Sanitary and Storm Sewer Pipes and Structure Materials. 4150. Water Main, Valve, Fire Hydrant, and Appurtenance Materials. 4151. Steel Reinforcement. 4152. Structural Steel. 4153. Miscellaneous Iron and Steel. 4154. Fence Materials.
4100.02
General Provisions
4155. Guardrail. 4156. Glass Fiber Reinforced Polymer Dowel Bars. 4160. Wood Preservatives. 4161. Preservative Treatment. 4162. Untreated Timber and Lumber. 4163. Treated Timber and Lumber. 4164. Treated Wood Posts. 4165. Timber Piles. 4166. Concrete Piles. 4167. Steel Piles. 4169. Erosion Control Materials. 4170. Landscape Plant Materials. 4171. Detectable Warnings. 4182. Paints for Steel Bridges and Structures. 4183. Traffic Paints and Pavement Markings. 4184. Reflectorizing Spheres for Traffic Paint. 4185. Highway Lighting Materials. 4186. Signing Materials. 4187. Materials for Sign Support Structures. 4188. Traffic Control Devices. 4189. Traffic Signal Equipment. 4190. Nonferrous Metals. 4191. Keyway and Expansion Tubes. 4192. Caulking Compound. 4193. Hydrated Lime for Soil Stabilization. 4194. Calcium Chloride and Sodium Chloride. 4195. Bearing Pads. 4196. Engineering Fabrics.