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4.0 Rel-)-.,-inci Suv, _._:its <br />As the Silva Cell is a system that interacts with other <br />infrastructure, repairs to adjacent elements, such as <br />paving surfaces or utilities and services, must be undertaken <br />with an understanding of the site -specific installation. <br />Repairs to all system components and adjacent or nearby <br />elements should be done per local guidelines and <br />individual manufacturer- directions, as applicable. <br />Each Silva Cell stack is independent of the Silva Cell <br />stack adjacent to it. Therefore, if an individual stack is <br />disturbed, the entire system is generally not expected to <br />be compromised. <br />Examples of repair processes are provided in the Tree <br />Planting Solutions for Hard Boulevard Surfaces Best <br />Practices Manual, included in Appendix B. This manual <br />documents two dernonstration projects conducted by <br />the City of Toronto, in which they field-tested a water <br />main break scenario and a gas lateral and riser installed <br />through Silva Cells. In both cases, the Silva Cells were <br />found to pose no significant. hindrance to their utility work. <br />Section IV of the Silva Cell Operations Manual (DeepRoot <br />2011), included in Appendix C, provides general <br />information on how to protect installed Silva Cell systems, <br />manage utilities in the vicinity of installed systems, repair <br />or replace overlying pavement, and remove or replace <br />Silva Cells and trees as needed. <br />5.0 Proor,mn,atic and ><;dr^inistraiive <_ u,dance <br />This section discusses regulatory requirements for LID <br />BMP maintenance (if applicable) and the available <br />programs and tools to help with implementation. <br />5.1 Regulatory Requirements for LID BMP <br />Maintenance Programs <br />As discussed above, this manual provides general <br />maintenance guidelines that can be adapted to <br />site specific rrrairat:enarrC:e Plans based on given <br />site conditions. If Silva Cells are installed as part <br />of a permanent stormwater management plan to <br />meet minimum storm water requirements for new or <br />redevelopment, local requirements for maintaining <br />LID BMPs would apply. Consult the local standards <br />and requirements to determine the maintenance <br />requirements that will need to be addressed. <br />5.2 Tools for Implementing an LID Maintenance Program <br />A range of administrative tools can be used to assist <br />jurisdictions in implementing required maintenance <br />activities for stormwater BMPs, such as Silva Cells. The <br />tools vary depending on jurisdiction requirements, but <br />may include (Ecology 2013b): <br />• Stormwater requirements <br />(i.e., Code, manual, ordinance) <br />• Legal agreements between private or public owners <br />and the regulatory agency (i.e. access easements, <br />property maintenance covenants, <br />or transfer of ownership; <br />• Maintenance requirements specified as part of the <br />design process <br />• Financial liability measures <br />• Record keeping and tracking requirements <br />• Inspection and maintenance checklists <br />• Inspection and maintenance schedules <br />• Mapping <br />• Owner education (public or private) <br />6.) ;-\Gd:tiot- al Resource's <br />The following resources provide additional information <br />on maintenance of LID facilities applicable to Silva Cells. <br />• Western Washington Low Impact Development <br />Operations and Maintenance Guidance Document <br />,'��i,.,wa � aril i �,i/i i � I i?AiPJ�J„! <br />• LID Technical Guidance Manual for Puget Sound <br />�ri rr yvi >i1 lw, orr"wa ercc:,:` t € o n., .[ -, <br />• International Society of Arboriculture <br />Silva Cell Operation and Maintenance Manual <br />