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12 <br /> <br />Table 1. Descriptions of soil mapping units of the study area <br />(USDA NRCS Web Soil Survey ). <br />Soil Series/Soil <br />Map <br />Unit <br />Symbol <br />Parent Material Drainage Class <br />% <br />Hydric <br />Composition <br />SAN EMIGDIO <br />SERIES <br />San Emigdio Loam <br /> <br />LaE2 Sedimentary <br />alluvium Well-drained 0 <br />SAN JOAQUIN <br />SERIES <br /> San Joaquin loam, 0- <br />2% slopes <br />PgB <br />alluvium derived <br />from mixed but <br />dominantly <br />granitic rock <br />sources <br />Well and <br />moderately well- <br />drained <br />0 <br />San Joaquin loam, 2- <br />9% slopes PoC2 <br />alluvium derived <br />from mixed but <br />dominantly <br />granitic rock <br />sources <br />Well and <br />moderately well- <br />drained <br />0 <br />TUJUNGA SERIES <br /> Tujunga sand Rc alluvium from <br />granitic sources <br />Somewhat <br />excessively <br />drained <br />0 <br /> http://soils.usda.gov/technical/classification/osd/index.html <br />The East Bay Area has a Mediterranean climate with warm to hot, dry summers and cool <br />winters. Annual precipitation in the general vicinity of the site is highly variable from year to <br />year, but average annual rainfall is approximately 16 inches, most of which falls between <br />October and April. Stormwater runoff readily infiltrates the site’s soils; but when field capacity <br />has been reached, gravitational water either drains to an intermittent tributary of Sycamore Creek <br />in the northern portion of the site, or drains to the existing wetlands in the lowest portion of the <br />site near Alisal where it eventually flows into a roadside ditch along Alisal and into an <br />underground culvert. <br />