656.02 657 and timbers; felling and destroying of all snags and such dangerous trees; and pruning trees, native shrubs and similar vegetation but does not include work to be performed under Item 201.
656.02 Intensity of Cleanup. Control the intensity of cleanup to effect a natural
transition in cleanup treatment from the edge of the pavement outward to the limits of the Right -of-Way to avoid sharp demarcation between the artificial and the natural.
656.03 Cleaning. After removal of large objects, clean the designated areas with
grubbing rakes or wide -spaced tooth rakes. Do not disturb or injure desirable grass, vines, or wild flowers.
656.04 Pruning. Prune trees 6 inches (150 mm) or less in d iameter and native
shrubs and similar vegetation according to Item 666. Consider the diameter of existing trees to be the diameter measured at 54 inches (1.4 m) above the ground.
656.05 Disposal of Refuse. Use removed materials in the Work when the
materia l conforms to the specifications; if not, then recycle or dispose of the material according to 105.16 and 105.17.
656.06 Method of Measurement. The Department will measure Roadside
Cleanup by the number of M square feet (square meters) cleaned up and accep ted. The Department will determine the boundaries of the area to be cleaned up and the number of units.
656.07 Basis of Payment. The Department will pay for accepted quantities at
the contract price as follows: Item Unit Description 656 M Square Feet Roads ide Cleanup (Square Meter) ITEM 657 RIPRAP FOR TREE PROT ECTION
657.01 Description
657.02 Materials
657.03 Tree Wells in Fill
657.04 Walls in Cut
657.05 Hand -Laid Stone Riprap
657.06 Earthwork
657.07 Pipe Drains
657.08 Method of Measurement
657.09 Basis of Payment
657.01 Description. This work consists of furnishing and placing riprap for
protecting selected trees or shrubs by tree wells and retaining walls.
657.02 Materials. Furnish stone consisting of sandstone, limestone, or other
natural rock with a maximum 30 percent single slab loss and a maximum 20 percent cumulative loss after testing to ASTM D 5240. Use an 8 -inch slab test sample. The 657.03 658 Department may waive testing when the stone source has a known durability history. Furnish embankment according t o Item 203. Unless otherwise specified, use 4 -inch (100 mm) pipe conforming to 611 Type E conduits.
657.03 Tree Wells in Fill. Where a fill around a tree or shrub not marked for
removal will be 12 inches (0.3 m) or more in depth over the feeding root area or ground surface lying within the periphery of the tree, construct a dry hand -laid stone riprap tree well. Construct a wall, of the same height as the fill, circling the tree or shrub and 3 1/2 feet (1 m) from the tree trunk or as specified. Construct the wall so that the top of the wall follows the contour on the finished grade in a neat line. Construct tree wells before placing the fill over the root area. However, the Contractor may bring up the fill with the wall after required aggregate for root aerat ion is in place according to Item 658.
657.04 Walls in Cut. Where the top of the slope in cut is within 6 feet (2 m) of
the trunk of a tree not marked for removal, construct a dry hand -laid stone riprap wall. Toe the bottom of the wall into the ground 2 in ches (50 mm) unless otherwise shown on the plans, and make the top of the wall even with the original ground line at the base of the tree. Extend the length of the wall far enough from the tree to amply cover the roots, or according to the shape and size a s shown on the plans. Flare the ends of the wall back, and taper or fade them out into the finished grade of the slope in a neat line.
657.05 Hand -Laid Stone Riprap. Construct the earth bed on which riprap is to
be placed to a slope of 1 foot (300 mm) vert ical to 2 inches (50 mm) horizontal. Dress the earth bed to a true plane. Where riprap is to rest against a fill, tamp the embankment against the back of the stone. Construct riprap for walls or wells according to the arrangements and dimensions shown on t he plans. Lay each course with the long dimensions of each stone perpendicular to the slope or batter. Use individual stones that are roughly rectangular in cross -section and are a minimum of 3 inches (75 mm) in the vertical depth with a horizontal dimensi on of not less than 15 inches (0.4 m). Place the individual stones by hand, one upon the other so that they break joints with the stone in the course below. Where it is necessary to use more than one stone to provide the specified thickness or depth of the wall, thereby resulting in joints parallel to the face of the wall, place such stones to break joints with the adjacent stones. Fill the space between the larger stones with spalls rammed into place. Ensure that the surface of the finished riprap does not vary more than 3 inches (75 mm) from that shown on the plans, and that it presents an even, tight surface, pleasing in appearance.
657.06 Earthwork. Perform excavation and embankment, as necessary,
according to Item 203.
657.07 Pipe Drains. Drain tree wells with pipe starting on the original ground
surface and lay to drain beyond the toe of the fill. Install pipe for drains according to Item 611.