07/06/2010 Council Packet - Laserfiche WebLink

Home Search

• • Attachment 2: Landscaping and Tree Preservation Standards - REVISED JUNE 21, 2010 Page 10 adequate thickness, once plants grow together there is often need for little or no mulch. Mulch shall comply with the following requirements: a) Provide mulch at a depth of 3 -4" for wood chips, 4 -6" for shredded bark and 3 -4" for rocks or other non - organic matter. b) Provide a 3' minimum diameter mulch ring at the base of trees. c) Prohibit mounding mulch at the bases of trees, or allowing mulch within 4" of plant stems and trunks, as this will cause them to rot. d) If used, only water permeable fabric is permitted as a weed barrier. e) Leave one inch of space from the top of the mulch layer to adjacent hardscape surfaces to prevent spilling. f) The City may limit certain types of mulch in areas where safety or spilling may be an issue. Mulch should not be mixed with underlying soil. g) 4) Fertilizer: When fertilizer is used, organic and slow release fertilizers are recommended. 5) Drainage: Tree planting pits shall drain adequately. Drainage for trees may be accomplished through the use of non - compacted and well draining soils. The City may require the following drainage test: Dig 8" diameter holes 1' deep and fill with water. If the holes do not drain within 24 hours adjust bed design or composition in order to achieve proper drainage. If the underlying soils retain water, the applicant shall provide additional drainage measures. 6) Tree protection after construction: Bollards, barriers, or spacing may be necessary to protect trees from cars. Bike parking should be included to discourage locking bikes to trees. For tree protection during construction see Section Q.15. c. Tree and Infrastructure Placement: Tree placement should be given consideration when locating overhead and underground utilities. Service utilities should be located outside of plant beds where they may conflict with tree plantings. Consider using conduits for buried utilities to allow future work with less disruption to roots. The clearances in the following table are recommended from the center of the tree trunk to avoid future conflicts: Utility Distance to Center of Tree Lights, Utility Poles, Fire Hydrants 10' Water, Sanitary, Storm and Gas lines 6' from the center of the line. Conduit for dry utilities (electric, cable) 3' Utility clean outs and access points 3' Overhead utility lines (consult utility company for additional requirements) 5' to mature tree canopy (may require trimming, topping is prohibited, see Section Q.10.f)