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Page 9 Tun Monroe Patterson Pass Business Park The Patterson Run draunage bisects the site, flowing from under the California Agtieduct northeast to the Delta Mendota. Canal. Drainage A flows northeast from. the California . . Drainage B also flows Aqueduct, and is an existing State of California Drainage Easement northeast from the California Aqueduct to a pond. .4rea C is located to the west of Patterson pun. Ali potential jurisdictional wetlands.and waters are indicated on the fottr U.S. Army Corps of Engineers Potential Jurisdictional Wetlands and Waters of the.U.S maps. 1,4ETHODS Wetlands were delineated using the 'Corps of Engineers Wetlands DeLneafion Manual" (Environmental Laboratory 1987 with updates). A total of twenty data points were utilized to dcterniile the extent and location of the uplandiwetland boundaries. At each data point, information was collected about vegetation, soils and hydrology. The dominant and sub- dominant Flan species were identified and their relative percentage cover was determined. Soil pits %vere excavated 'at each data point to an average depth of twelve inches to. characterize tine potential extent extent-of hydric soils and presence of wetland hydrology at each location,. Wetland hydrology criterion is usually satisfied if the soil was saturated or inundated within z major portion of the root zone for more than 5% (18 or more days) of the growing season. In • this case, the growing season would be the frost free period, which at this location is year round. Field 'indicators used to identify hydrology include wetland topography, drainage patterns, drift lines, sediment ,deposits on plants and other objects, .water marks, visual observation of soil saturation or inundation, oxidized rhizospheres, and other indicators. Wetland soil criterion are satisfied if soils have low chroma, exhibit gleyed colors, or have concretions or mottles. According to the San Joaquin County soil classification map,-the study area consists of one soil type: Cm-Ra-Capay-Rossi Waukena-D, characterized as clay soils with low infiltration rates, permanent water table, §oils.with a claypan or clay layer at or near the surface, and shallow soils over nearly impervious material Wetland vegetation criterion is satisfied if the plants identified at the data point location ti*e classified as Obligate (OBL), Facultative-Wetland (FACW) or Facultative (FAC) wetland- plant species as listed in the National List of PIant Species that Occur in Wetlands: California (Region 0)U.S.Fish and Wildlife Service. — -- - A section of Patterson Run was delineated on November.21, 1997 A_totai of eighteen data points were utilized to determine the extent and location of the upland/wetland boundary This area was delineated separately to characterize the extent of the low-lying '.'flood plain'.' . area south of Patterson Run, at :the northeast end of-the drautage. ;At this location the boundaries of the wetland drainage and adjacent upland area isnot clearly defined. _ _ - RMI - - . - RlS Ott id Ai"A t.1I.%C