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Page 2 1% Jim Monroe Patterson Pass Business Park The Patterson Run drainage bisects the site, flowing from under the California Aqueduct northeast to the Delta Mendota Canal. Drainage A flows northeast from the California Aqueduct, and is an existing State of California Drainage Easement. Drainage B also flows northeast from the California Aqueduct to a pond. Area C is located to the nest of Patterson Run. All potential jurisdictional wetlands and waters are indicated on the four U.S. Army Corps of Engineers Potential Jurisdictional Wetlands and Waters of the.U.S maps. METHODS Wetlands were delineated using the "Corps of Engineers Wetlands Delineation Manual" (Environmental Latx-)ratory 1987 with updates). A total of twenty data points were utilized to dete-m,ine the extent and location of the upland/wctland boundaries. At each data point, information was collected about vegetation, soils and hydrology. The dominant and sub- domirant plant 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 the potential 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 a major portion ofthe 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-Rn-Capay-Rossi Waukena D, characterized as clay soils with low infiltration rates, permanent water table, soils with a claypan or clay laver 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 are classified as Obligate (OBL), Facultative-Wetland (FACW), or Facultative (FAC) wetland plant species as listed in the National List of Plant Species that Occur in Wetlands: California (Region O)U.S. Fish and Wildlife Service. A. section of Patterson Run was delineated on November 21, 1997. A total 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 drainage. At this location the boundaries of the wetland drainage and adjacent upland area is not clearly.defined. RMI R LCOL ACL NJAc 4 1.1 NL %T I\ ILA.1 A T 10 Al • I \C.