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110 | CITY OF PLEASANTON URBAN FOREST MASTER PLAN <br />URBAN FOREST MANAGEMENT PRACTICES <br />1.3.4 Infrastructure Conflicts <br />An infrastructure conflict exists when the proximity of a tree’s canopy, roots, or trunk <br />poses a risk of damage to adjacent buildings, roofs, walkways, roads, pipes, or other <br />structures. Appendix K: Infrastructure Conflicts and Sidewalk Solutions provides <br />guidelines for decision-making when various tree-related infrastructure conflicts arise, <br />and Appendix L: Sidewalk Solutions provides specific options to mitigate conflict <br />between a tree and sidewalk damage. <br />Current Practices <br />The most common tree and infrastructure conflicts in Pleasanton involve tree roots <br />impacting sewer lines, curbs, or gutters. The Operations and Maintenance - Streets <br />and Signs Division of Public Works is responsible for addressing sidewalk repairs <br />in Pleasanton and was not able to provide specific annual costs for tree-related <br />infrastructure repairs. A study by McPherson (2000) indicates that California cities <br />allocate approximately 30% of their tree budgets to addressing infrastructure conflicts, <br />which includes mitigative tree work, prevention, and litigation. Similarly, about 30% of all <br />liability claims filed against the City of Pleasanton are related to these tree infrastructure <br />conflicts. <br />Recommendations: <br /> ƒProper species selection in the planting phase will help minimize the frequency of <br />costly infrastructure conflicts. Refer to Appendix C: Recommended Tree Species List . <br /> ƒConsult Table 1-10 to determine the most appropriate mitigation option when <br />presented with an infrastructure conflict. Also refer to Appendix K: Infrastructure <br />Conflicts and Sidewalk Solutions.