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ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM FCS 91 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx would not introduce a new mechanism for direct disturbance to aquatic habitat, shoreline vegetation, or aquatic species. Therefore, consistent with the impact conclusions in the Prior FEIR, this option would not increase the potential for impacts to sensitive habitats or special-status species and would remain subject to all applicable water quality treatment and regulatory requirements as well as all mitigation identified in the Prior FEIR. Accordingly, biological resource impacts would remain less than significant and consistent with the conclusions of the Prior FEIR. Mitigation Measures MM BIO-1a Burrowing Owl • To avoid potential impacts to active burrowing owl nests and adult owls, a qualified Biologist shall conduct protocol-level burrowing owl surveys in accordance with the California Department of Fish and Wildlife (CDFW) 2012 Staff Report. • If an active nest is identified near a proposed work area and work cannot be conducted outside of the nesting season (March 15 to September 1), a no-activity zone will be established by a qualified Biologist. The no-activity zone shall be large enough to avoid nest abandonment and shall, at a minimum, be a 250-feet radius from the nest. • If the burrowing owls are present at the site during the nonbreeding period, a qualified Biologist shall establish a no-activity zone of at least 150 feet. • If an effective no-activity zone cannot be established in either case, an experienced burrowing owl Biologist shall develop a site-specific plan (i.e., a plan that considers the type and extent of the proposed activity, the duration and timing of the activity, the sensitive and habituation of the owls, and the dissimilarity of the proposed activity with background activities) to minimize the potential to affect the reproductive success of the owls. MM BIO-1b Protection of Active Bird Nests (includes pre-construction survey and implementation of avoidance buffer, if found). 1. Removal of trees shall be limited to only those necessary to construct the proposed project as reflected in the relevant project approval documents. 2. If the proposed project requires vegetation to be removed during the nesting season (February 1 to August 31), pre-construction surveys shall be conducted no more than 7 days prior to the start of ground or vegetation disturbance (including tree removal) to determine whether or not active nests are present. 3. If an active nest is located during pre-construction surveys, a qualified Biologist shall determine an appropriately sized avoidance buffer based on the species and anticipated disturbance level. (The California Department of Fish and Wildlife [CDFW] recommends a minimum no-disturbance buffer of 250 feet around active nests of non-listed bird species and a 500-foot no-disturbance buffer around active nests of non-listed raptors.) A qualified Biologist shall delineate the avoidance buffer using Environmentally Sensitive Area fencing, pin flags, and/or