The 140-acre Gilbert site is located in Oakley in northeast Contra Costa County. The site was predominantly the level plain of a formerly irrigated pasture with a vegetated sand hill that rose in the center of the site, a remnant of the sand dunes that once occupied this region. The primary purpose of these surveys was to determine if special status invertebrate species that inhabit temporary pools were present on the site. Pools with adequate habitat were sampled at two-week intervals until they had dried following USFWS protocols. No special status vernal pool Branchiopods or other invertebrates were found on the site, leading to much more manageable and inexpensive permitting conditions.
During local development reviews for the 2,100-acre Roddy Ranch in the City of Antioch, the CNPS raised concerns regarding potential rare plant impacts, and included a list of almost 200 species that could occur on-site. Zentner Planning and Ecology completed field surveys from the spring through the fall to ensure adequate coverage for the blooming period of all plant species. By completing detailed surveys and documenting our procedures, we were able to show non-presence of most rare plant species, map those few rare species that occurred, and allay the CNPS concerns.
Mission Clay is a former clay quarry in Niles Canyon on the eastern edge of the City of Fremont adjacent to Alameda Creek. The site, which is set for reclamation work by Mission Clay Properties, our client, has a variety of natural, semi-natural and quarry wetland habitats with the potential for California red-legged frog (Rana draytonii; CRF) use. Critical habitat was only about a mile from the site. A CRF assessment was submitted to the USFWS to evaluate the site for CRF use and to obtain permission to conduct surveys. The surveys were completed in both the breeding and on-breeding season. In this case, no CRF were observed making the remaining reclamation work simpler to complete.