Glenn Lukos Associates
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GLENN LUKOS ASSOCIATES Regulatory Services October 21, 2010 Joann Lombardo Comprehensive Planning Services P.O. Box 15592 Newport Beach, California 92659 SUBJECT: Results of Biological Overview for the City of Chino Hills, San Bernardino County, California. Dear Ms. Lombardo: Per your request, the following letter identified special-status species and habitats that have potential to occur within the City of Chino Hills based on literature review and site reconnaissance. Impacts to special-status species and habitats must be addressed during project review under the California Environmental Quality Act (CEQA). In addition, species Federally listed as threatened or endangered are regulated by the U.S. Fish and Wildlife Service (USFWS) pursuant to the Federal Endangered Species Act (ESA). Species listed as threatened or endangered by the State of California are regulated by the California Department of Fish and Game (CDFG) pursuant to the State ESA. Wildlife that are assigned other designations by CDFG (i.e., species of concern, fully-protected species, etc.), and plants given special status by the California Native Plant Society (CNPS) are not granted additional protection, except that impacts to these species may need to be evaluated pursuant to CEQA. I. SITE DESCRIPTION The City of Chino Hills is located within southwest San Bernardino County, California [Exhibit 1 – Regional Map]. The City is generally bounded by Interstate 60 to the north, Highway 71 to the east, the Santa Ana River to the south and Los Angeles County to the west. The City is located within the eastern Puente-Chino Hills, which are at the northern end of the Peninsular Ranges geomorphic province and are bounded on the northwest by the San Gabriel Valley, on the northeast by the San Bernardino Valley, and on the south by the Santa Ana River Canyon and the 29 Orchard Lake Forest California 92630-8300 Telephone: (949) 837-0404 Facsimile: (949) 837-5834 Joann Lombardo Comprehensive Planning Services October 21, 2010 Page 2 Los Angeles Basin [Exhibit 2 – Survey Area Map]. Elevations vary from approximately 500 feet to 1,600 feet above sea level. The City is underlain by sandstone bedrock of the Puente Formation and the Topanga Formation and is traversed by the Chino Fault. In general, the underlying geologic formations of a given area will ultimately dictate the vegetation that may establish, and the wildlife that the vegetation will support. Soils develop from the erosion and weathering of parent materials, which depending on the type of parent materials will determine the resulting soil types. Individual plant species, including many sensitive plant species, often have particular soil requirements, including whether the soil is well drained or not, and the type of soil as defined by the particle size (i.e., clay, sand, loam, etc.). For example, species such as Munz’s onion ( Allium munzii ) and many- stemmed dudleya ( Dudleya multicaulis ) occur in clay soils in scrub and grassland habitats, whereas chaparral sand verbena ( Abronia villosa var. aurita ) occurs in sandy soils associated with scrub habitats. Certain plant species are further restricted to areas with very specific parent material, which affects the chemistry of the soil. For example, Braunton’s milk-vetch (Astragalus brauntonii ) usually occurs in soils containing calcium carbonate. In addition to soil types, geologic faults and fractures in the underlying rock can allow for water to seep to the surface, which allows for the development of isolated seep wetlands amongst a broader area of upland vegetation. These isolated seeps provide habitat for plants and wildlife that may not typically occupy the adjacent upland habitats, in addition to representing a water source for wildlife. The Study Area for the scope of this letter report excludes Chino Hills State Park, which is addressed separately by the Chino Hills State Park General Plan. The Study Area totals approximately 34 square miles. II. METHODOLOGY GLA biologists visited the study area on August 4, 2010. Site reconnaissance was conducted in such a manner as to allow inspection of approximately 20-percent of the Study Area [Exhibit 2 – Survey Area Map] by direct observation, including the use of binoculars 1. Site reconnaissance was intended to familiarize biologists with the vegetation communities/land cover types occurring within the study area and each community’s distinct characteristics that distinguish it on the aerial photography. Aerial photography was then used in the office to complete habitat mapping for those areas not examined in the field. 1 GLA focused on the “undeveloped” portions of the Study Area, that is areas with natural vegetation (both native and non-native) as developed areas exhibit minimal potential for supporting special-status plants, animals or communities. Joann Lombardo Comprehensive Planning Services October 21, 2010 Page 3 In addition to site reconnaissance, evaluation of the facilities included a review of the July 2010 California Natural Diversity Database (CNDDB) for the Black Star Canyon, Ontario, Orange, Prado Dam, San Dimas and Yorba Linda Quadrangles 2, the 2010 California Native Plant Society (CNPS) inventory 3, the U.S. Fish and Wildlife Service (FWS) Wetland Inventory 4, and FWS critical habitat maps for endangered and threatened species. III. RESULTS Suitable habitat for a variety of special-status plant and animal species occurs within the Study Area as described below. A. Vegetation/Land Cover Mapping As described above, generalized mapping of major vegetation communities and land cover types was carried out based upon aerial photography with spot checks in the field. Vegetation communities have been classified according to a combination of FWS wetland mapping categories and Holland vegetation classification 5. Table 1 below summarizes the approximate acreage of each community type. Exhibit 3 depicts the distribution of habitat communities within the Study Area. TABLE 1: Vegetation or Land Cover Types Observed Within the Chino Hills Study Area Habitat Type Approximate Area Percentage of (acres) Total Developed 8,816 41.0 Annual Grasslands 7,985 37.2 Diegan Coastal Sage Scrub 1,665 7.8 Coast Live Oak Woodland 778 3.6 Chaparral 741 3.4 Southern Willow Scrub 417 1.9 2 California Department of Fish and Game. July 2010. Natural Diversity Database: RareFind 2. 3 California Native Plant Society. 2010. Inventory of Rare and Endangered Plants of California (v7-10b). Rare Plant Advisory Committee, David Tibor Convening Editor, California Native Plant Society, Sacramento, California, accessed electronically via www.cnps.org 4 U.S. Fish and Wildlife Service. 2010. National Wetlands Inventory. Accessed electronically via http://www.fws.gov/wetlands/Data/Mapper.html 5 Holland, R. October 1986. Preliminary Description of the Terrestrial Natural Communities of California. Department of Fish and Game, California. Joann Lombardo Comprehensive Planning Services October 21, 2010 Page 4 Walnut Woodland 288 1.3 Agriculture 207 1.0 Coast Live Oak Riparian Forest 180 0.8 Riverine 155 0.7 Coastal Sage Scrub/Chaparral Ecotone 104 0.5 Freshwater Emergent Wetland 70 0.3 Sycamore-Alder Riparian Woodland 40 0.2 Open Water 36 0.2 Total 21,482 100% Developed Approximately 41-percent of the Study Area consists of residential and commercial development including ornamental vegetation and landscaping. Annual Grasslands Annual grassland is dominated by annual grasses that are primarily of Mediterranean origin. Approximately 37-percent of the Study Area consists of annual grassland. Dominant species found in this community include wild oat ( Avena fatua ), ripgut grass ( Bromus diandrus ), foxtail chess ( Bromus madritensis ssp. rubens ), foxtail barley ( Hordeum murinum ssp. leporinum )wild radish ( Raphanus sativus ), bull thistle ( Cirsium vulgare ), tocalote ( Centaurea melitensis ) and wild mustard ( Brassica nigra ). Diegan Coastal Sage Scrub Diegan Coastal Sage Scrub consists of drought-deciduous, low, soft-leaved shrubs with herbaceous understory on gentle to steep slopes under 3,000 feet. Approximately 8-percent of the Study Area supports Diegan sage scrub communities. Dominant species in this community include California sagebrush ( Artemesia californica ) and California buckwheat ( Eriogonum fasciculatum ). Other component species include laurel sumac ( Malosma laurina ), coast goldenbush ( Isocoma menziesii ), white sage (Salvia apiana ), black sage ( Salvia mellifera ), deerweed ( Lotus scoparius ) and coyote brush ( Baccharis pilularis ). Diegan Coastal Sage Scrub is designated by DFG & CNDDB with a Sensitivity 3.1 “very threatened” (S3.1)- “Occurs in 21- 100 viable locations statewide and/or between 10,000 and 50,000 acres of habitat remaining.” This habitat has potential to support federally threatened coastal California gnatcatcher (Polioptila californica californica ) as well as several other special status species as detailed in Tables 2 and 3. Joann Lombardo Comprehensive Planning Services October 21, 2010 Page 5 Coast Live Oak Woodland Coast Live Oak Woodland is dominated by coast live oak ( Quercus agrifolia ) and exhibits a shrub layer that varies from sparse to moderately dense and may include toyon ( Heteromeles arbitufolia ), gooseberry ( Ribes spp.), laurel sumac, and Mexican elderberry ( Sambucus nigra ). Approximately 4-percent of the Study Area supports coast live oak woodland communities. Coast Live Oak Woodland and southern California Coast Live Oak Riparian Forest are designated by DFG & CNDDB