Environmental Resources and Conservation Element
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6 ENVIRONMENTAL ReSOURCES AND CONSERVATION ELEMENT he City of San Bruno extends from The Environmental Resources and the lowland areas near the San Fran- Conservation Element provides policies T cisco Bay, westward to and across for biological resources and habitat, wa- the ridgeline of the Santa Cruz Mountains. ter resources and quality, and air quality This variation in elevation, and concomi- and greenhouse gas reduction. Historical tant variation in temperature and precipita- resources, generally clustered along the tion patterns, endows San Bruno with a historic El Camino Real corridor, are also diversity of natural resources. addressed for conservation. 6-1 VISION 6-2 BIOLOGICAL ReSOURCES AND HABITAT The Environmental Resources and Conservation Ele- ment seeks to ensure preservation of Crestmoor Can- Although urbanization has removed much of the city’s yon, natural canyons within the western neighborhoods, original vegetation, it is still found in scattered, discrete and surrounding Golden Gate National Recreation Area areas. Several distinctive vegetative communities found lands as habitat for grasslands species. No public open in San Bruno include: space lands are proposed to be converted to other uses, and the General Plan policies regarding biological and • Freshwater wetlands. Freshwater wetlands are ecologi- water resources will enhance natural resources on public cally productive habitats that support a rich variety lands and waters within the city and surroundings. The of both plant and animal life. This transitional habi- element also seeks to preserve the wetlands areas along tat occurs between terrestrial and aquatic systems the San Francisco Bay margins as habitat for aquatic spe- where water tables are near the surface or land is cies. The element reiterates San Bruno’s commitment covered by shallow water. Grass-like plants, which to the reduction of water pollutants collected in surface emerge from the water, form a dense canopy. Sea- runoff, and reduction in transportation-related air pol- sonal and permanent wetlands in eastern San Bruno lutants and emissions related to global climate change. include coastal freshwater marsh. This habitat is one of the most productive habitats for wildlife because Finally, the element provides a framework for preserva- it offers water, food, and shelter. Reptiles, amphib- tion of historical resources, and placement of signage to ians, birds, small mammals, and bats are found in identify California historical landmarks. wetlands areas. • Willow riparian. Willow riparian habitat is low shrubby tree structure that can cover an entire water- course with an impenetrable understory, and can include fallen limbs and other debris. Willow scrub community is a broad-leaved, winter-deciduous streamside thicket, dominated by any of several wil- low species, usually as small trees or shrubs. Birds, reptiles, amphibians, and small mammals are found in riparian areas. • Mixed oak woodland. Mixed oak woodlands are dominated by any of several oak species, with an understory consisting of shrubs, non-native grasses, and wildflowers. Woodlands provide foraging, nest- ing, shelter, and migrating corridors for a variety of wildlife species. Birds, small and large mammals, and amphibians utilize this habitat. 6-2 San Bruno General Plan • Non-native annual grassland. Non-native grassland current maps from the US Fish and Wildlife Wetlands consists of annual grasses associated with a variety Online Mapper indicate that there are small areas of of broadleafed herbs and perennial grasses. Reptiles, freshwater emergent wetland near the southwest corner small and large mammals, and foraging birds are of the intersection of I-380 and US 101 near 7th and often found in grassland areas. Walnut Park, and small areas of freshwater emergent wetland and freshwater forested/shrub wetland a little Areas within San Bruno that feature potential biologi- further south along the western side of US 101, adjacent cal resources are illustrated in Figure 6-1. Despite their to Lion’s Field. While their general location indicates separation and relatively small size, these areas poten- they are quite close to the city limits, without a field sur- tially contain a number of legally sensitive plant and ani- vey it is difficult to know the precise boundaries of these mal species. Although the California Natural Diversity wetlands resources. While the City is not responsible for Database (California Department of Fish and Game, the condition of wetlands outside city boundaries, the 2001) shows no sensitive plant species within the city proximity of these wetlands to San Bruno development limits, there are a number of relatively inaccessible areas suggests that City land management and development in the higher elevations of the city, and it is possible that decisions could impact the wetlands through changing these have never been comprehensively surveyed for sen- nearby levels of human activity, rates of stormwater run- sitive plants. off, and populations of domestic animals adjacent to this habitat. Conversely, maintenance of these areas directly Sensitive Species and Habitats impacts the flooding potential in the eastern areas of San Bruno. Located in central San Mateo County, the Peninsula Watershed encompasses 23,000 acres of the San Fran- The State of California recognizes some plant commu- cisco peninsula, hosts a variety of habitats and supports nities as sensitive or significant communities if they are San Bruno contains a variety of natural habitats the highest concentration of rare, threatened and endan- uncommon, regionally declining, or vulnerable. Among and special status species. Among these are mixed gered species in the entire Bay Area. The Watershed these communities are coast live oak forest, freshwater woodlands and grasslands in the western hills (Crestmoor neighborhood, top), and mature Euca- includes three reservoirs—San Andreas, Crystal Springs, seeps, and freshwater marshes. All three may be present lyptus trees along Sneath Lane (bottom). and Pilarcitos. Though no part of San Bruno physically within the city boundaries. drains into this watershed, Skyline Boulevard marks an eastern edge, and a sensitive boundary for these species. Two endangered or threatened animal species have been reported within city limits: the California red-legged frog Within the central portion of the city (generally along (Rana aurora draytonii, federally listed as threatened and the El Camino Real corridor), urban development is too a State species of special concern) and the San Francisco intense for vegetation other than ornamental. However, garter snake (Thamnophis sirtalis tetrataenia, listed as as the terrain rises to the west, larger areas of natural endangered by both the State and federal governments). vegetation and topography are found within the matrix Both have occurrences reported in Lion’s Field, east of El of development, some of it within inaccessible sites that Camino Real and south of Crystal Springs Road (Envi- have not been surveyed thoroughly. Additionally, the ronmental Science Associates, 1999). In addition, the Bay margins along the city’s eastern edge provide habi- U.S. Fish and Wildlife Service indicated that some areas tat areas for a variety of wetlands species. In particular, east of Skyline College may provide suitable habitat for ENVIRONMENTAL ReSOURCES AND CONSERVATION ELEMENT 6-3 FIGURE 6-1 Vegetative Communities and Special Species Habitat Figure 6-1 Vegetative Communities and SHARP PARK RD Special Species Habitat SK Y LIN E 82 BLVD Inaccessible Site; EL CAMINO REAL IN not surveyed but COLLEG TERSTATE 280 E D may contain sensitive R species or habitats. MONTGOMERY MONTGOMERY AVE FLEETW 35 O O D SNEATH LANE D R INTERSTATE 380 AVE WALNUT EUCLID ST San Francisco SNEATH LANE R SAN BRUNO AVE EAST B D Garter Snake AY L (potential) HIL H U SAN BRUNO AVE WEST N AVE TIN KAINS G U TO S H EL C N IG H A AVE WA M IN Freshwater Forested/Shrub AVE Y O 10 REA KAINS 1 SAN L Freshwater Emergent Wetland BRU NO AV E W CHERRY AVE EST California Red-Legged Frog SAN MATEO AVE Coast Live Oak, LINDEN C R Willow Riparian, ELM E S CYPRESS Mission Blue Butterfly possible Freshwater T M Seep habitats. Nesting O AVE AVE O California AVE birds and raptors, R White-Rayed Pentachaeta JENEVEIN Red-legged Frog possibly including AVE D Cooper’s Hawks. R Saltmarsh Common Yellowthroat San Francisco SKYLINE Garter Snake Potential Sensitive Species AVE Damselfly Inaccessible Site; not BLVD SAN FELIPE Inaccessible Site surveyed but may contain sensitive SAN ANSELMO species or habitats. E CRYSTAL S AV Potential Nesting Birds PRINGS City Limits 35 Source: Environmental Science Associates, 2002; AVE California Natural Diversity Database; Dyett & EL CAMINO REAL Bhatia, 2002, 2003. 10 0 500 1000 2000 San Andreas acres FEET R e s e r v o i r 82 DYETT & B HAT I A Urban and Regional Planners both species (U.S. Fish and Wildlife Service, 2000). 6-3 WATER ReSOURCES However, for species such as these that may be collected or captured relatively easily, precise locations are usually The City of San Bruno contains three parallel water- not reported or mapped for the safety of the species. sheds—Crystal Springs, Huntington Creek, and San Bruno Creek—which flow west to east, with riparian A third legally sensitive species, the western pond turtle woodlands in the upper reaches and willow riparian hab- (Clemmys marmorata, a State species of special concern) itat in the lower, slower-moving reaches. The Health and might be found at Lion’s Field and at other wetland Safety Element (Chapter 7) provides further discussion areas, such as the stream area in Crestmoor Canyon, of the local watersheds, San Bruno’s stormwater drain- even though no occurrences have been reported. Two age system, and flooding hazards. sensitive plants have been reported at Lion’s Field: Dud- ley’s lousewort (Pedicularia dudleyi, a federally-listed Water Quality species of concern and State rare species) and stink bell (Fritillaria agrestis, California Native Plant Society Cat- The San Francisco Bay Regional Water Quality Con- egory 4 species).