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3.1.7 Trees / Vegetation <br />Silva Cells fundamentally promote tree growth, and <br />are typically designed with one or more trees that are <br />planted either in the facility or next to the facility in a way <br />that allows the roots to grow into the soil media. Properly <br />designed Silva Cells provide the needed soil volume and <br />quality, water flaw, an(] air flow to allow the trees to reach <br />their true mature size. <br />As healthy trees grow, their canopies provide increasing <br />capacity over time for interception, storage, and <br />evapotranspiration. As the roots grow, they increase <br />the trees' ability to uptake stormwater and associated <br />poll:tants and enhance infiltration by rnaint:aining <br />macropores in the soil column. Maintaining the trees as <br />part of the Silva Cell system is therefore important to the <br />overall performance of the facility over time. See Table 1 <br />for recommended maintenance activities and schedule. <br />Trees and vegetation adapted to site conditions, such <br />as climate, hydrology, and soil type, should be selected <br />wherever possible to reduce chemical inputs and reduce <br />or eliminate tine need for watering. Proper design, <br />installation, anc.a maintenance of the inlet systern (Section <br />3.1.2) and distribution system (Section 3.1.3) are also <br />important to maintaining trees and vegetation properly <br />watered. Similarly, proper design, installation, and <br />maintenance of the unclerdrain pipe and flow control <br />devices are important to maintaining desired watering <br />regimes and draw -down rates. <br />3.1.8 Surface Treatment <br />Silva Cells can be designed to provide structural support <br />for a variety of surface treatment types, including hard <br />surfaces (e.g., permeable or impermeable asphalt, <br />concrete, pavers, etc.) or natural surfaces (e.g., soil, lawn, <br />vegetation). Surface treatments should be maintained <br />in accordance with manufacturer recommendations <br />and local jurisdiction requirements (i.e., pertaining to <br />sidewalks, roadways, etc.), as applicable. <br />3.2 Maintenance Guidelines <br />The following table provides a breakdown of <br />recommended routine inspection and maintenance <br />activities and frequencies, conditions that trigger non - <br />routine maintenance, and the associated recommended <br />non -routine (triggered) maintenance activities for key <br />Silva Cell components. <br />Silva Cell Operation and Maintenance Manual <br />