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SAN LEANDRO SHORELINE DEVELOPMENT EIR ADDENDUM PROJECT CITY OF SAN LEANDRO Page 22 PlaceWorks butterflies, special-status fish and other aquatic species, and nesting birds which, are protected under State and federal regulations. The Original Project included 64 townhomes, 42 single family residences, and 28 townhomes within the existing 32-acre golf course. Development for the Original Project avoided the stand of blue gum eucalyptus habitat where the winter roosting colony of monarch butterflies congregate at the eastern edge of the golf course. However, the South Golf Course Residential Component of the Original Project was located directly adjacent to the monarch butterfly habitat, which likely provides important wind buffering functions and could provide nectaring and resting locations for individual butterflies. Although these residences avoided most of the trees, there remained the possibility that construction and/or vegetation management activities by future residences could adversely affect these trees and result in indirect adverse effects on the butterfly colony. Furthermore, monarch butterfly winter roosting habitat could be adversely affected if adequate controls on tree removal and pruning are not implemented. Short-term impacts such as construction-generated fumes and dust could adversely affect roosting butterflies if construction is initiated or performed in close proximity during the overwintering period, generally from October 1 to March 1. The Original Project found that this would be a significant impact. In contrast, the Approved Project included 152 single family residences and 48 residential townhomes which are pulled closer to Monarch Bay Drive on the west and Fairway Drive to the south, respectively. Although the 152 single family residences and 48 residential townhomes for the Approved Project represented in a larger development east of Monarch Bay Drive in comparison to the Original Project, the proposed structures are located approximately 600 feet to the west of the blue gum eucalyptus and pines which are located on the eastern portion of the remaining golf course. Therefore, the First Addendum found that the shift in development area would represent a potential avoidance and reduction in impacts to habitat for the winter roosting colony of monarch butterflies. The additional 6 townhome units from the Modified Project would be located within the same footprint of the site plan from the Approved Project and would not result in additional encroachment into the monarch butterfly habitat. To reduce the potential impact to the monarch butterfly habitat to less than significant, the Original Project Certified EIR included Mitigation Measure BIO-1A detailed in Chapter 4.3, Biological Resources, of the Certified EIR. The Mitigation Measure would also be implemented for the Modified Project, which includes the preparation of a Monarch Butterfly Roosting Habitat Protection Program (MBRHPP). Therefore, with implementation of Mitigation Measure BIO-1A, the Modified Project would not result in a new impact or a substantial increase in magnitude of the existing impacts to the winter roost colony of monarch butterflies. The Original Project included improvements to shoreline areas of tidally influenced open water resulting in potential direct and indirect effects on several special-status fish species. The Original Project found that construction could cause disturbance to aquatic habitat of the bay, requiring drilling and excavation for pier/dock installation and shoreline modification, and suspending silts and other substrate within the construction zone, resulting in a temporary reduction in water quality, or inadvertent injury or loss of individual special-status fish species, if present within the construction zone. These impacts were considered a significant impact for the Original Project for which appropriate construction avoidance measures, implemented as part of Mitigation Measure BIO-1B were necessary to prevent possible loss of