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Subd. 4. Tree Preservation Barriers <br />All tree protection areas are recommended to be designated as such with "Tree <br />Save Area" signs posted in addition to the required protective fencing. Signs <br />requesting sub - contractor cooperation and compliance with tree protection <br />standards are recommended for site entrances. <br />b. Before any construction or grading takes place, snow fencing or erosion <br />control fencing shall be placed around the borders of woodlots at the dripline <br />of large trees to be preserved. Signs shall be placed along this fence line <br />prohibiting grading beyond the fence line. <br />c. These fences will be orange polyethylene laminar safety fencing or of woven <br />polyethylene fabric (silt fencing). <br />d. Passive forms of tree protection may be utilized to delineate tree save areas <br />outside of the MUSA line with approval of the City. These areas must be <br />completely surrounded with continuous rope or flagging (heavy mil - <br />minimum 4" wide). "Keep Out" or - "Tree Save" signage must accompany all <br />passive tree protection methods. <br />e. No construction shall begin until this work has been completed, inspected, and <br />accepted by the City. <br />f. Silt barriers or similarly effective erosion control barriers shall be required in <br />any area where erosion or siltation may cause damage to protected trees. <br />All protective tree fencing, staking or continuous ribbon and all erosion <br />control barriers must be installed prior to and maintained throughout the land <br />disturbance and construction process, and should not be removed until <br />acceptable vegetation is established. <br />Subd. 5. Critical Root Zone. The root system within the dripline is <br />generally considered to be the critical root zone. To protect these critical root zones, a tree <br />protection area shall be established around each tree or group of trees to be retained. <br />g. <br />a. The tree protection area shall include no less than the total area beneath the <br />tree canopy as defined by the dripline of the tree or group of trees collectively. <br />b. Wherein authorized excavations it becomes necessary to expose or cut roots <br />more than one (1) inch in diameter, it shall be the duty of the contractor to <br />protect such root(s) under advice from the City. <br />c. All open trenching is prohibited. Utility installation within the dripline of <br />protected trees, during construction or thereafter, can only occur using <br />trenchless methods. <br />