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2.5.3 EVAPORATION The estimated annual evaporation for the site is 78.43 inches, based on Pan A evaporation data recorded between 1919 and 1968 at Oakdale Woodward Dam (Station No. B00 630500, latitude 37151'28", longitude 120°5242", Elevation 215 feet amsl), located approximately 13 miles southeast of the site (California Department of Water Resources, 1979). A minimum mean monthly evaporation of 1.14 inches has been calculated for December and January, and a maximum mean monthly evaporation of 14.69 inches has been calculated for July. 2.5.4 WIND The California Air Resources Board (1984) analyzed wind data for the Stockton WB Airport for the period from 1964 to 1980. The prevailing wind for the Stockton station blows from the west-northwest (45.3 percent of the time) and the north (15.9 percent of the time). Calms occur 8.06.9 percent of the time. A wind rose Figure 4 developed from the Stockton WB Airport data provides wind direction information. The mean annual wind speed is 8.2 miles per hour. 2.6 SURFACE WATER HYDROLOGY The North and South Creeks traverse the FL. The North Creek has been relocated to the northern boundary of the landfill. The South Creek transects the site at the southeastern corner of the property and is proposed to be relocated to the southern landfill boundary. Most of the creek flow is from agricultural drainage. The 100-year flood elevations at the eastern property boundary and the western property boundary are approximately 41 feet and 38 feet, respectively. (Federal Emergency Management Agency, 1979). Figure 5 presents the regional 100-year floodplain map. As shown on this map, the majority of FL is within flood zone designation C (Federal Insurance Rate Map, U.S. Dept. of Housing and Urban Development, May 15, 1980). Areas designated as Zone C are areas of minimal flooding that lie outside the 100-year and 500-year floodplains. Forward Landfill-Project Description 2-8 BRYAN A.STIRRAT S ASSOCIATES J:\Allied\Forward\2007.0018 Lateral Expansion\Reports\Proj Descrip\021308 Final Proj Des\Sec 2.doc:2/13/2008)