DEFINITIONS Brush Density can be described as listed below.  Brush acres in the centerline zone are not subdivided by density.  Categories for high voltage distribution and border zone areas of transmission lines are: Sparse Brush Acres is the geographic area that is occupied by tree species that have a crown cover density of less than or equal to thirty-three percent (33%). Medium Brush Acre is the geographic area that is occupied by tree species that have a crown cover density of more than thirty-three percent (33%) and less than sixty-six percent (66%). Dense Brush Acre is the geographic area that is occupied by tree species that have a crown cover density of more than sixty-six percent (66%). Centerline Zone is that area of transmission line right-of-way energized at 138 kV or above that is directly below and in between the outermost conductors of a structure plus and additional ten (10) feet to each side.   Danger Tree is defined as any woody species that attains a mature height greater than twenty (20) feet with a stem (bole) diameter of eight (8) inches or more at breast height (dbh) that is growing adjacent to the normally cleared area of transmission right-of-way and is capable of contacting the transmission line if it were to fall towards the line.  Danger trees may or may not be maintained landscape trees growing in a maintained a landscape. Distribution Brush Unit is a ¼ length of distribution span that contains any woody vegetation capable of growing 20 feet or more at maturity and is less than the conductor height within the right-of-way.  Distribution brush units are not in the reliability work but are included in the Unit Brush Work. Transmission Brush Unit is a sparse, medium or dense acre of woody vegetation capable of growing 20 feet or more at maturity within the right-of-way as identified by the Owner’s transmission inspection program that is not a transmission tree. Transmission Tree is any tree that attains a mature height greater than fifteen (15) feet and is a minimum eight (8) inches in diameter at dbh that is growing on a high voltage distribution or transmission right-of-way in an unmaintained area or any tree that attains a mature height greater than fifteen (15) feet and is a minimum four (4) inches in diameter at dbh that is growing on a high voltage distribution or transmission right-of-way in a maintained area. Tree is any woody species that attains a mature height greater than twenty (20) feet with a stem (bole) diameter of four (4) inches or more at dbh for distribution circuits and any woody species that attains a mature height greater than fifteen (15) feet with a stem (bole) diameter of eight (8) inches or more at dbh for high voltage distribution and transmission lines.  For reporting and billing purposes, trees growing near or adjacent to multiple conductors are considered one tree.  Multi-stem trees (same species) physically separated at a point greater than two (2) feet above ground level will be considered one tree if any of the stems, measured at dbh are four (4) inches in diameter or greater.  Each stem of multi-stem trees dividing at a point less than two (2) feet above the ground will be considered a separate tree if that stem, measured at dbh, is four (4) inches diameter or greater.