782607.03—Procedures Herbicide shall be applied in accordance with the manufacturer’ s recommendations by a Virginia Department of Agriculture and Consumer Services (VDACS) certified applicator or registered technician. Herbicide shall not be applied when the ambient temperature is above 85°F or below 60°F . The spray pressure shall be at least 20 but not more than 30 pounds per square inch. Spraying shall not be performed when the vegetation is wet, when it appears that rain is imminent within 6 hours, or when the wind is blowing enough to scatter paper or trash or when drifting of spray onto non designated areas seems likely.
607.04 Measurement and Payment
Herbicide spraying will be measured in units of 1,000 gallons of mixture and will be paid for at the contract price per unit. This price shall include furnishing and applying herbicide. Payment will be made under: ——————————————————————————————— Pay Item Pay Unit——————————————————————————————— Herbicide spraying Unit (1,000 gallons)——————————————————————————————— SECTION 608—MOWING
608.01 Description
This work shall consist of mowing designated areas to a height of not less than 4 inches when and as directed by the Engineer until final acceptance.
608.02 Equipment
Equipment used for mowing operations shall be mechanical with a cutting width of at least 5 feet unless otherwise restricted by access limitations. Mowing equipment operators shall carefully and diligently load, unload, temporarily store, and safely operate equipment according to Section 512, the VWAPM and MUCTD guidelines.
608.03 Measurement and Payment
Mowing, when a pay item, will be measured in hours of operation and will be paid for at the contract unit price per hour. This price shall include furnishing equipment, operators, fuel, lubricants, and any required traffic control including signs and warning devices. Maintenance of traffic costs will be considered incidental to mowing operations. Payment will be made under: ——————————————————————— Pay Item Pay Unit——————————————————————— Mowing Hour——————————————————————— 607.03 783SECTION 609—TREE WELLS AND TREE W ALLS
609.01 Description
This work shall consist of constructing wells and walls to protect the root system of trees, shrubs, or other woody plants at the locations shown on the Plans or as designated by the Engineer. Tree wells and Tree walls shall conform to the details shown in the Standard Drawings or as otherwise shown in the Plans.
609.02 Materials
a.Aggregate shall conform to Section 203.
b.Polyvinyl chloride (PVC) pipe shall conform to Section 232(g).
c.Geotextile fabric shall conform to Section 245.
d.Stone for rubble masonry shall conform to Section 204.
e.Masonry block and masonry brick shall conform to Section 222 or be as indicated in the plans.
609.03 Procedures
The Contractor shall perform excavation incidental to and necessary for constructing tree wells and tree walls in a manner that will not damage the root system of the tree. Ends and damaged sections of roots shall be cleanly cut. Roots with a diameter of more than 3 inches shall not be cut. Before any earthen fill that will exceed 12 inches in thickness is spread over the feeding root system of trees or shrubs to be protected by tree wells, an aeration layer of coarse gravel or stone, ranging from 1/2 to 5 inches in size, shall be spread over the entire area to a depth of at least 6 inches or at the rate of 3 inches for every 12 inches of earthen fill where such fills will be more than 2 feet in depth. The layer of aggregate shall be capped with sufficient fine screenings to choke the top of the porous fill. Aggregate shall not be placed inside the tree well.
609.04 Measurement and Payment
Tree wells and tree walls will be measured in cubic yards of masonry and will be paid for at the contract unit price per cubic yard for the standard specified. This price shall include excavating, and furnishing and installing stone, masonry block or block faced brick, drain pipe, geotextile fabric and backfill, including aggregate. Payment will be made under: —————————————————————————— Pay Item Pay Unit—————————————————————————— Tree well (Standard) Cubic yard Tree wall (Standard) Cubic yard—————————————————————————— 609.04
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 810–810 of 1,065.