Agenda - Council - 08/08/2023 - Laserfiche WebLink

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1 distance of at least 50 feet beyond thc limit of such area. Indicated elevations maybe base -et 2 on United States Geological Survey data. 3 (D) Tree preservation barriers protection measures. 4 {1) All tree protection areas arc recommended to bc designated as such with "Tree Save Arc " 5 &+gnu posted in addition to thc required protective fencing. Signs requesting pub eontractor 6 cooperation and--eompliancc with tree protection standards arc recommended for site 7 cntranecs. 8 (1) Before any construction or grading takes place, snow fencing (polyethylene laminate safety 9 netting) or erosion control fencing shall be placed at the dripline of significant trees around 10 thc borders of woodlots at the-driplinc of large trccs to be preserved. S+gns shall bc placed 11 a-I-efi-g this fence line-pfohibitin ding beyond thc fence line- 12 {3) These fences will be -orange polyethylene laminar safety fencing or of woven polyethylene 13 fabrie-(silt fencing). 14 {4) Passive forms of trcc protection may-bc utilized to delineate trcc Save areas outside of thc 15 MUSA line -with approval of thc city. The&c areas must be completely surrounded with 16 continuous ro-p-e fla-ggi-n-g (h-eavy mil — minimum four inches wide). "Keep Out" or "Tree 17 mac" signagc must aeeompany all passive trcc protection methods. 18 (2) No construction shall begin until this work has been completed, inspected, and accepted by 19 the city. -The tree protection measures shall not be removed until the land disturbance and 20 construction activities are complete. 21 (3) Silt barriers or similarly effective erosion control barriers shall be required in any area where 22 erosion or siltation may cause damage to protected trees. 23 {-7) All protective trcc fencing, staking or continuous ribbon and all erosion control barriers must 24 bc installed prie-F-to and maintaine-d throughout thc land--d4 turbanec and construction 25 process, and should not be removed until acceptable vegetation is c tablishe4 26 {-e) Critical root zone. The root system within the driplinc is generally considered to be thc critical met 27 zone. To protect these critical root zones, a tree protection arca shall be -established around each 28 trcc or group of trccs to be rctaine# 29 {1) The trcc protection arca shall include no less than the -total arca be -Reath the tree canopy as 30 defined by thc driplinc of thc trcc or group of trccs collectively. 31 (4) Wherein authorized excavations it becomes necessary to expose or cut roots more than one 32 inch in diameter, it shall be the duty of the contractor to protect such root under advice from 33 the city. 34 (5) All open trenching is prohibited. Utility installation within the dripline of protected trees, 35 during construction or thereafter, can only occur using trenchless methods. 36 (6) The mowing, clearing, and grubbing of brush located within or under the dripline of protected 37 trees may be allowed, provided such mowing, clearing, or grubbing is accomplished by hand 38 or by mowers. The use of heavy equipment for this purpose shall not be allowed. 39 (E) Removal threshold. 40 (1) Within residential developments, at 'cast no more than 40-60 percent of the inches of existing 41 significant tree DBH shall be fctaine4-on site removed. 42 (2) Within business and employment developments, at 'cast no more than 30-70 percent of the 43 inches of existing significant tree DBH shall be fctaine4-on site removed. 44 (3) Significant trees removed for water quality treatment ponds, public trails and sidewalks, and 45 arterial and collector streets as defined herein, or that are considered invasive species, are 46 considered exempt from the removal threshold calculation. 47 (F) Reforestation/restitution requirement. If a development exceeds the removal threshold specified 48 in (E) above, the developer shall either reforest areas within the site, pay restitution, or some 49 combination thereof. Page 48 of 160