Agenda - Planning Commission - 07/27/2023

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1 -(4) Exitingur data for the -entire property with vertical contour data eensistcnt with city 2 standards for all areas te-be-disturbcd by proposed trcc removal operations, extending for a 3 distance of at least 50 feet beyond the limit of such area. Indicated elevations may-bc base -el 4 on United States Geological Survey data. 5 (D) Tree preservation barriers protection measures. 6 {1) All tree protection areas arc recommended to bc designated as such with "Tree Save Arco" 7 -s+gns posted in addition to thc required protective fencing. Signs requesting pub contractor 8 cooperation and--eompliance with tree protection standards arc recommended for site 9 entrances. 10 (1) Before any construction or grading takes place, snow fencing (polyethylene laminate safety 11 netting) or erosion control fencing shall be placed at the dripline of significant trees around 12 thc borders of woodlots at the driplinc of large trccs to be preserved. Sgns shall be placed 13 ale-eg this fence line prohibiting grading beyond' the fence line: 14 {3) These fences will be -orange polyethylene laminar safety fencing or of woven polyethylene 15 fabric -(silt fencing). 16 k4) Passive forms of tree protection maybe utilized to delineate tree save areas outside of the 17 MUSA line -with approval of thc city. They-c areas must be—eomple el-y surrounded with 18 eontinuous rope or flagging (heavy mil minimum four inches wide). "Keep Out" or "Tree 19 Save" signagc must aeeompany all passive trcc protection methods. 20 (2) No construction shall begin until this work has been completed, inspected, and accepted by 21 the city. —The tree protection measures shall not be removed until the land disturbance and 22 construction activities are complete. 23 (3) Silt barriers or similarly effective erosion control barriers shall be required in any area where 24 erosion or siltation may cause damage to protected trees. 25 {7) All protective tree fencing, staking or continuous ribbon and all erosion control barriers must 26 be installe-d prior to and maintained througheet thc lan sturbanec and construction 27 p css, and should not bc removed until acceptable vegetation is established. 28 {-c) Critical root zonc. The root system within the driplinc is gcncrally-eonsidcrcd to bc thc critical rem 29 zonc. To protect these critical root zones, a tree protection arca shall be -established around each 30 trcc or group of trccs to bc rctaine4 31 {1) The trcc protection arca shall include no Tess than the4otal arca beneath the trcc canopy as 32 defined by thc dripline-of the tree or group of trees collectively. 33 (4) Wherein authorized excavations it becomes necessary to expose or cut roots more than one 34 inch in diameter, it shall be the duty of the contractor to protect such root under advice from 35 the city. 36 (5) All open trenching is prohibited. Utility installation within the dripline of protected trees, 37 during construction or thereafter, can only occur using trenchless methods. 38 (6) The mowing, clearing, and grubbing of brush located within or under the dripline of protected 39 trees may be allowed, provided such mowing, clearing, or grubbing is accomplished by hand 40 or by mowers. The use of heavy equipment for this purpose shall not be allowed. 41 (E) Removal threshold. 42 (1) Within residential developments, at least no more than 40-60 percent of the inches of existing 43 significant tree DBH shall be fctaine-d-on site removed. 44 (2) Within business and employment developments, at least no more than 30-70 percent of the 45 inches of existing significant tree DBH shall be fctained-on site removed. 46 (3) Significant trees removed for water quality treatment ponds, public trails and sidewalks, and 47 arterial and collector streets as defined herein, or that are considered invasive species, are 48 considered exempt from the removal threshold calculation. Page 48 of 160