Type: report

Article abstract: BACKGROUND In collaboration with Groundwork San Diego and the San Diego Association of Governments (SANDAG), AECOM was selected to enhance and restore existing and potential coastal cactus wren (Campylorhynchus brunneicapillus) and California gnatcatcher (Polioptila californica californica) habitat in Encanto and Radio Canyons. Groundwork San Diego-Chollas Creek (Groundwork) is an independent, not-for-profit, environmental business that works within San Diego's Chollas Creek Watershed to improve the environment, economy, and quality of life in the area through local community projects. Over the past several years, Groundwork has been an integral part of the restoration and enhancement of the Chollas Creek area. The project was funded by SANDAG under the Transnet Environmental Mitigation Program (EMP). This project was identified as an opportunity to create and enhance habitat for the coastal cactus wren (Photo 1) and California gnatcatcher and offer a more native landscape for the community surrounding the sites. The habitat enhancement and restoration objectives included removal of nonnative plant cover and planting of approximately 20,000 new cholla cactus (Cylindropuntia prolifera), which is preferred nesting habitat for the coastal cactus wren. The California gnatcatcher would also benefit from the improved habitat, since this species is also present in the project area and uses maritime succulent scrub habitat in conjunction with coastal sage scrub habitat. Enhancement and expansion of areas with existing occupied gnatcatcher and cactus wren habitats improves and expands habitat for both species, improving the chances for the long-term health of local and regional populations. This project also offered a unique opportunity for students and residents within the surrounding canyon communities to play an important role in project planning and implementing of the coastal cactus wren. AECOM and Groundwork collaborated in the execution of project tasks. AECOM led the site mapping, habitat restoration, monitoring, maintenance, and reporting tasks, and Groundwork led the educational, community involvement, and publicity aspects of the project. The project is located in the community of Encanto in southern San Diego, California, north of Market Street between Euclid Avenue and Merlin Drive (Figures 1 and 2). The total area of both canyons combined is 73.62 acres. Encanto Canyon consists of 37.24 acres and Radio Canyon consists of 36