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Appendix I Focused Biological Surveys and Wetland Delineation

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Appendix I Focused Biological Surveys and Wetland Delineation Appendix I Focused Biological Surveys and Wetland Delineation Focused Biological Surveys and Wetland Delineation for the Santa Maria Integrated Waste Management Facility, Los Flores Ranch, Santa Barbara County, California Prepared for: City of Santa Maria Prepared by: Rincon Consultants, Inc. July 2009 Focused Biological Surveys and Wetland Delineation for the Santa Maria Integrated Waste Management Facility, Los Flores Ranch, Santa Barbara County, California Submitted to: City of Santa Maria Utilities Department 2065 East Main Street Santa Maria, CA 93454 Submitted by: Rincon Consultants, Inc. 1530 Monterey Street, Suite D San Luis Obispo, CA 93401 Contact: Susan V. Christopher Kevin Merk July 2009 Rincon Project Number 06-91690 Integrated Waste Management Facility Biological Resources Study EXECUTIVE SUMMARY Rincon Consultants, Inc. conducted focused surveys for special status and common biological resources on the proposed Santa Maria Integrated Waste Management Facility (IWMF) project site, hereafter referred to as the “site” or “property.” The 1,774-acre property is located within the Solomon Hills, approximately 6.5 miles southeast of the unincorporated community of Orcutt and immediately east of Highway 101 in northern Santa Barbara County. The project footprint of the proposed IWMF is comprised of approximately 617 acres that would include a landfill, soil stockpile areas, and associated infrastructure within the central eastern portion of the property. The remaining areas of the property would remain in ownership by the City of Santa Maria, and would be used for passive recreation and preserved as mitigation areas. Focused surveys were conducted for special status plant and animal species. Botanical surveys were conducted over two growing seasons, and the locations of special status plant species and habitat types were mapped. An oak tree inventory was conducted for all areas within the proposed IWMF project footprint, which included tagging, measuring and mapping individual coast live oak (Quercus agrifolia) trees. A wetland delineation was conducted on the site to determine areas under the jurisdiction of the U.S. Army Corps of Engineers (Corps), California Department of Fish and Game (DFG), and Regional Water Quality Control Board (RWQCB). A soils map was prepared using available data. One protocol upland survey for the California tiger salamander (Ambystoma californiense) was conducted at a topographic depression. Two protocol wet season surveys for listed branchiopod species, particularly the vernal pool fairy shrimp (Branchinecta lynchi), was conducted at 12 pools on the property. Terrestrial amphibian and reptile surveys included focused visual surveys and searches of cover objects. Amphibians were also detected during the course of the vernal pool fairy shrimp surveys. Bird and mammal surveys were generally conducted concurrent to other surveys. Although the property has been disturbed by past oil exploration activities, a large proportion of the site containing natural habitats that support wildlife remained relatively intact and disturbed areas have undergone natural recovery. Moderately high levels of cattle grazing have resulted in degraded grassland and wetland habitats, poor oak regeneration, and likely contributed to erosion along drainages. Nevertheless, the property contained nine natural habitats including oak woodland, coastal scrub, maritime chaparral, riparian, wetland, valley needlegrass grassland, and mulefat scrub. Naturalized habitats included non-native grassland and eucalyptus, and areas with iceplant and ruderal habitat also were present. Three of these habitat types are considered to be special status by the DFG (maritime chaparral [central maritime chaparral], 58.5 acres; riparian [Central Coast arroyo willow riparian forest], 4.3 acres; and valley needlegrass grassland, 14.4 acres). Two additional habitats, mulefat scrub and wetland, are protected when other jurisdictional parameters are met. Five special status plant species and 11 special status animal species were detected on the property during the surveys. Five special status animal species are expected to occur on the property, but were not found during the surveys. Six animal species could potentially occur or are unlikely to occur, and were not detected during the surveys. Two of the species in the “unlikely” category include the California tiger salamander and the vernal pool fairy shrimp, both of which are federally listed species. Special status plant species observed on the site included the paniculate tarplant (Deinandra paniculata), mesa horkelia (Horkelia cuneata ssp. puberula), California spineflower (Mucronea californica), dune larkspur (Delphinium parryi ssp. blochmaniae), and La Purisima manzanita City of Santa Maria i Integrated Waste Management Facility Biological Resources Study (Arctostaphylos purissima). None of these species are federally listed; however, California spineflower and paniculate tarplant are identified as California Native Plant Society List 4 species, and the other species are identified as List 1B species. Mesa horkelia, dune larkspur, and La Purisima manzanita occurred only in the northern part of the property. The total number of individual oak trees inventoried was 3,181, and were represented by 5,595 trunks that were at least four inches diameter at breast height. A majority (51%) of the trees were large, mature individuals. Jurisdictional wetlands on the property were confined to drainages that were considered to be waters of the U.S. and state of California. There were approximately 12.23 acres of wetland waters (including riparian and mulefat scrub areas within drainages) and 4.18 acres (25,553 linear feet) of non-wetland waters that were determined to fall under the jurisdiction of the Corps, RWQCB, and DFG on the property. In addition, approximately 1.41 acres of isolated wetlands were identified that may fall under RWQCB jurisdiction under pending policy. The results of the present study suggest that California tiger salamanders are unlikely to occur on the property. The site is within the region occupied by this species, and therefore, the presence of occasional transient individuals cannot be ruled out at this time. No compelling evidence exists that California tiger salamanders use upland areas on the site. No California tiger salamanders were observed during the upland drift fence survey. The topographic depression did not fill with standing water at any time during 2006/2007, but rainfall was only 37% of normal this season. Because there was no standing water, aquatic sampling could not be performed. Common species of amphibians, reptiles, and small mammals were caught in the traps, as well as a western spadefoot (Spea hammondii), a California species of special concern toad species. Based on several years of study, suitable aquatic breeding sites for the California tiger salamander do not appear to exist on the property, with the possible exception of a detention basin in the southern portion of the property along Highway 101. This pond was sampled intensively for two years during the listed vernal pool branchiopod surveys, and California tiger salamanders were not present. There are a few recorded occurrences of the California tiger salamander within this species’ dispersal distance (1.2-miles) of the southern portion of the property, and this area is outside of the proposed landfill footprint. The property does not occur within the upland area that California tiger salamanders typically move from breeding ponds (2,034-feet) for these known locations. In addition, salamanders from these populations would need to cross Highway 101 to access the property, which further reduces the potential for this species to occur on-site. Furthermore, the topography of most of the site is probably too steep since California tiger salamanders generally occur in low-lying areas. There is a slight possibility that California tiger salamanders could inhabit other adjacent sites that have not been documented. Therefore, there is very low potential that California tiger salamanders could use eastern and southern portions of the site for upland refuge and dispersal. The focused survey results suggest that listed vernal pool branchiopods are unlikely to occur on-site. No vernal pool branchiopods were observed in any of the pools during the sampling that was conducted over two years. The surveys met the requirements under the protocol to be considered a full survey for the U.S. Fish and Wildlife Service to make a presence/absence determination. Although rainfall was below normal, five pools in 2008 and five pools in 2009 experienced inundation long enough for vernal pool fairy shrimp to complete their life cycle. Therefore, this species would have been detected during the surveys if they were present on- City of Santa Maria ii Integrated Waste Management Facility Biological Resources Study site. Invertebrate taxa observed included corixids, ostracods, rotifers, chironomids, dystiscid larvae and adult beetles, notonectids, midge larvae, and mosquito larvae. Eggs and larvae of the western spadefoot, were found at three pools. Both survey years had below normal precipitation, however, and no tadpoles survived to metamorphosis before the pools dried up. Northern Pacific treefrog (Pseudacris regilla) eggs and tadpoles also were detected in the pools. No listed vernal pool branchiopods are recorded from the vicinity of the site, and the nearest locations of vernal pool fairy shrimp are from Vandenberg
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