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Site Sustainability Metrics <br />4- 2 City of Arden Hills Energy and Sustainability <br />Grass and Planting Cover: <br />The diagram to the right illustrates the existing extent of grass <br />and planting cover within the City Hall site. <br /> Tree Canopy <br />Twin City Metro Average: <br />City of Arden Hills Average: <br />Arden Hills City Hall Site:54% <br />34.6% <br />20.8% <br />Existing City Hall <br />As outlined in Section 1 of this report, a community’s land cover characteristics can impact - either multiplying or <br />mitigating - on the effects of climate. The following is a review of the land cover characteristics of the existing Arden Hills <br />City Hall site and an estimation of the corresponding impacts and benefits. <br />Tree Canopy Cover: <br />The diagram to the right illustrates the existing extent of tree <br />cover within the City Hall site. <br /> Tree Canopy <br />Twin City Metro Average: <br />City of Arden Hills Average: <br />Arden Hills City Hall Site:7% <br />37% <br />26.9% <br />A healthy tree canopy within a community as well as a building <br />site offers a number of environmental and economic benefits, <br />including air pollution abatement, carbon sequestration, <br />building energy savings, heat island mitigation, and storm water <br />runoff mitigation. The chart to the right shows the estimated <br />annual benefits of the tree canopy of the existing Arden Hills <br />City Hall site. <br />Existing Tree Canopy Annual Pollution Removal Benefits <br />Carbon Monoxide Removal 0.09 Pounds <br />NO2 Removal 0.72 Pounds <br />Ozone Removal 7.50 Pounds <br />Fine Particulate Removal 0.23 Pounds <br />SO2 Removal 0.09 Pounds <br />Coarse Particulate Removal 2.31 Pounds <br />CO2 Sequestration 1,296.38 Pounds <br />Total Carbon Stock 43,533.54 Pounds <br />Annual Tree Canopy Pollution and Energy <br />Benefit Value $ 1,129.00 <br />Existing Site Landcover <br />Impervious Site Coverage 41,708 38.99% <br />Parking and Sidewalks 32,133 <br />Building impervious 9,575 <br />Tree Canopy 7,517 7.03% <br />Grass 57,745 53.98% <br />Total Subject Area 106,970 100.00%