5_Exhibit B_Resolution_Attachment 2

12 Dissimilarity Index Guidance for Cities with Small Racial Group Populations The analysis conducted for this report suggests that dissimilarity index values are unreliable for a population group if that group represents approximately less than 5% of the jurisdiction’s total population. HCD’s AFFH guidance requires the Housing Element to include the dissimilarity index values for racial groups, but also offers flexibility in emphasizing the importance of various measures. ABAG/MTC recommends that when cities have population groups that are less than 5% of the jurisdiction’s population (see Table 4), jurisdiction staff use the isolation index or Thiel’s H-Index to gain a more accurate understanding of their jurisdiction’s neighborhood-level segregation patterns (intra-city segregation). If a jurisdiction has a very small population of a racial group, this indicates that segregation between the jurisdiction and the region (inter-city segregation) is likely to be an important feature of the jurisdiction’s segregation patterns. In City of Pleasanton, the Black/African American group is 1.7 percent of the population - so staff should be aware of this small population size when evaluating dissimilarity index values involving this group. Table 2 below provides the dissimilarity index values indicating the level of segregation in Pleasanton between white residents and residents who are Black, Latinx, or Asian/Pacific Islander. The table also provides the dissimilarity index between white residents and all residents of color in the jurisdiction, and all dissimilarity index values are shown across three time periods (2000, 2010, and 2020). In Pleasanton the highest segregation is between Black and white residents (see Table 2). Pleasanton’s Black /white dissimilarity index of 0.306 means that 30.6% of Black (or white) residents would need to move to a different neighborhood to create perfect integration between Black residents and white residents. However, local jurisdiction staff should note that this dissimilarity index value is not a reliable data point due to small population size. See callout box above for more information. The “Bay Area Average” column in this table provides the average dissimilarity index values for these racial group pairings across Bay Area jurisdictions in 2020. The data in this column can be used as a comparison to provide context for the levels of segregation between communities of color are from white residents in this jurisdiction.