Changes

[[File:Completed tree trench.PNG|thumb|400px|An example of a stormwater tree trench system located within the existing street median, Mississauga, ON. Central Parkway retrofit. (Source: STEP, 2016).<ref> https://cvc.ca/wp-content/uploads//2021/07/TechReport_CPW_Final.pdf</ref>]]

[[File:Completed tree trench.PNG|thumb|400px|An example of a stormwater tree trench system located within the existing street median, Mississauga, ON. Central Parkway retrofit. (Source: STEP, 2016).<ref> https://cvc.ca/wp-content/uploads//2021/07/TechReport_CPW_Final.pdf</ref>]]

*'''Tree Maintenance''': Inspection and maintenance of all municipally-owned trees shall be conducted by municipal staff or its contractors after the warranty period of the construction contract. This work may include, frequent watering and fertilizing as trees begin to establish themselves in the feature, this is especially important during drought-like conditions. Proper tree pruning is also important throughout the life of the tree, but especially during the early life stages of trees to help limit the potential for detrimental deformations or growth habits. This will help reduce costs as the tree matures and attempts at correcting improper growth, or replacement of the tree entirely becomes more costly. Staff involved in inspection and maintenance of these features should be experienced with the designated planting plan, plant species identification, and weed removal and control methodologies enacted by the municipality.  

*'''Tree Maintenance''': Inspection and maintenance of all municipally-owned trees shall be conducted by municipal staff or its contractors after the warranty period of the construction contract. This work may include, frequent watering and fertilizing as trees begin to establish themselves in the feature, this is especially important during drought-like conditions. Proper tree pruning is also important throughout the life of the tree, but especially during the early life stages of trees to help limit the potential for detrimental deformations or growth habits. This will help reduce costs as the tree matures and attempts at correcting improper growth, or replacement of the tree entirely becomes more costly. Staff involved in inspection and maintenance of these features should be experienced with the designated planting plan, plant species identification, and weed removal and control methodologies enacted by the municipality.  

*'''Inlet Structures''': Drainage pipes and structures within or draining to the subsurface bedding beneath porous pavement should be cleaned out on regular intervals .<ref name=manchester2002/>

 

*'''Heavy Vehicles''': Trucks and other heavy vehicles can ground dirt into the porous surface and lead to clogging. These vehicles should be prevented from tracking or spilling dirt onto the pavement. Signage and training of facilities personnel is suggested. .<ref name=manchester2002/>

*'''Planting Beds''': Remove invasive species and weeds, trash and organic debris. Ensure to refresh mulch to retain complete coverage and add mulch to correct grade inconsistencies in tree beds flush with the sidewalk (minimum depth of 50 mm to a maximum of 100 mm and an minimum of 40 mm from the base of the tree in the feature). To be completed every 3 - 6 months.

*'''Construction and Hazardous Materials''': Due to the potential for groundwater contamination, all construction or hazardous material carriers should be prohibited from entering a permeable pavement site.<ref name=manchester2002/>

 

*'''Drainage Areas''': Impervious areas contributing to the permeable pavement should be regularly swept and kept clear of litter and debris.Flows from any landscaped areas should be diverted away from the pavement or at least be well stabilized with vegetation.

*'''Pavement / Covered Trenches''': Maintain tree surroundings and grates and ensure that the grates themselves are level with the sidewalk, as needed. After 3 - 5 years, dependent upon tree growth, remove inner ring to allow tree to mature and grow unimpeded.  

 

*'''Inlets''': This may include trench drains, curb cuts/openings and pavement edges, all obstructions of trash and debris should be removed twice a year. Any plants within trench drains themselves or 100mm of the entrance or exit of said drains shall be removed twice a year.

 

*'''Irrigation System''': Maintenance or replacement of these system components shall take place as required, meanwhile winterizing watering systems to prevent damage shall take place twice a year (in the Spring and Fall). To limit excess salt impacts in the feature flushing and/or leaching excess sodium in the soil should be done annually in the spring by fully saturating the passive irrigation system with water.

 

*'''Grid Pavers''': Paver or grid systems that have been planted with grass should be mowed regularly and the clippings should be removed. Water and fertilize as needed. .<ref name=manchester2002/>

*'''Grid Pavers''': Paver or grid systems that have been planted with grass should be mowed regularly and the clippings should be removed. Water and fertilize as needed. .<ref name=manchester2002/>

*'''Seal Coating''': Seal coats should never be applied to permeable pavements. Current and future owners and operations staff must be aware of permeable pavement areas and the importance of not applying any sealants. Porous asphalt and pervious concrete look very similar to their impervious versions and could be inadvertently sealed over.  

*'''Soil / Growing Medium''': Testing of soil to determine its structure, organic matter and confirm microbial level counts are satisfactory for selected vegetation will take place at installation and during performance diagnostic intervals. Whereas organic fertilizing and soil amendments recommended by testing will be done on an as-need basis.

*'''Potholes''': For porous asphalt or pervious concrete, isolated potholes can be patched with standard patching mixes. Patching can continue until the structural integrity of the pavement has been compromised or stormwater can no longer drain to the aggregate base. Then the surface will need to be torn up and replaced.  

*'''Potholes''': For porous asphalt or pervious concrete, isolated potholes can be patched with standard patching mixes. Patching can continue until the structural integrity of the pavement has been compromised or stormwater can no longer drain to the aggregate base. Then the surface will need to be torn up and replaced.