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DEVELOPING THE PLEASANTON URBAN FOREST MASTER PLAN Table 2-12. Relative Performance Index for the Six Most Common Species in Pleasanton's Inventory City Inventory Entire Inventory Average 1.76 Platanus x London plane hispanica Quercus agrifolia coast live oak Sequoia sempervirens Quercus lobata coast redwood valley oak Pistacia chinensis Chinese pistache Lagerstroemia crape myrtle indica Source: City of Pleasanton Tree Inventory (Dudek 2024) 0.7 2.4 0.1 2.7 0.8 0.6 The City of Pleasanton is not currently meeting the recommended RPI goal as the City's top six tree species average score is currently 1.22, and the average score for the entire tree inventory is 1.76. While the City's two most common oak species have RPI scores greater than 2.0, the other four of the six most common tree species in Pleasanton have RPI scores below the overall average. The first and third most common tree species in the City inventory, Sequoia sempervirens has the lowest RPI score of 0.1, and is considered unsuitable for Pleasanton's predicted future climate without supplemental watering (McBride and Lacan 2022). Although Plotanus x hispanica and Lagerstroemia indica both have RPI scores below 1, these two tree species are staples within Pleasanton and there are many examples of these two species performing well even in tough conditions, such as the Platanus x hispanica trees that have survived without irrigation along Bernal Avenue (See Figure 1-7 in Part 1) Recommendations ■ The City should enhance maintenance practices with targeted care such as improved watering, pruning, and pest management. Increased monitoring will help address health issues promptly. For persistently unhealthy species, phased replacement with species that typically have higher RPI scores is recommended. CITY OF PLEASANTON URBAN FOREST MASTER PLAN 1 137