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5.0 Environmental Analysis 5.1 Land Use <br />Avion Project SEIR <br />Page 5.1-15 <br />Invasives <br />No invasive non-native plant species shall be introduced into areas adjacent to the MHPA (City of San <br />Diego 2013). <br /> The project planting palette does not include any invasive or non-native plant species <br />adjacent to the MHPA area. Additionally, according to City standards for brush <br />management, Zone 2 will include only native, locally indigenous species. <br />Native shrub species and hydroseed would be installed on the manufactured slope adjacent <br />to the MHPA on the western and eastern slopes of the project and only temporarily irrigated <br />until the plants have become established. It is recommended that they be irrigated using a <br />temporary aboveground irrigation system. The plants should be installed in late winter to <br />early spring, as this is the optimal time for native plant growth and seed germination. A <br />120-day plant establishment period and a 24-month maintenance and monitoring period are <br />necessary to ensure that the native plants establish successfully. Maintenance activities <br />would involve control of non-native plant species, maintenance and removal of the <br />temporary irrigation system, and replacement planting (if necessary). The site should be <br />monitored by a biologist quarterly to evaluate site conditions and to recommend remedial <br />actions, if needed. <br />Barriers/Access <br />New development adjacent to the MHPA may be required to provide barriers (e.g., non-invasive vegetation, <br />rocks/boulders, fences, walls, and/or signage) along the MHPA boundaries to direct public access to <br />appropriate locations and reduce domestic animal predation (City of San Diego 2013). <br /> The project would include boundary fencing along lots at the top of slopes and at the edge <br />of most private drives to delineate residential use areas from adjacent MHPA open space <br />areas. Lots adjacent to MHPA open space would have a glass-block view fence and lots at the <br />top of slopes would have a metal picket view fence. The entry private drive would have a <br />3-rail concrete fence to deter access to the adjacent MHPA open space area. The private <br />drive segment that terminates in the southwest portion of the site dead ends into a steep <br />cut slope which with signage would deter pedestrian access to the MHPA. The private drive <br />segment in the southeast portion of the site adjacent to open space would be at the top of a <br />steep slope that, along with signage, would restrict access to the adjacent MHPA located at <br />the toe of the slope. <br /> Signs should be posted at the edge of unfenced private drives and along perimeter <br />segments fenced with the 3-rail concrete fence to inform residents of the restricted adjacent <br />MHPA open space preserve areas. <br /> The project would include native vegetated slopes adjacent to the MHPA boundary. These <br />vegetated steep slopes (2.2:1-1.5:1) would also function as a deterrent to pedestrian access <br />into the MHPA.