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1-6 <br />1.7.4 Evaporation <br />The estimated annual evaporation for the site is 78.43 inches based on Pan A evaporation <br />data recorded between 1919 and 1968 at Oakdale Woodward Dam (Station No. BOO <br />630500, latitude 3r51'28", longitude 120°52'42", elevation 215 feet above mean sea level <br />[amsl]), located approximately 13 miles southeast of the site (California Department of Water <br />Resources, 1979). A minimum mean monthly evaporation of 1.14 inches has been calculated <br />for December and January, and a maximum mean monthly evaporation of 14.69 inches has <br />been calculated for July. <br />1.7.5 Wind <br />During summer periods, winds usually originate from the north end of the San Joaquin Valley <br />and flow in a south-southeasterly direction through the valley and Tehachapi pass, and then <br />into the neighboring Southeastern Desert Air Basin. During winter months, winds <br />occasionally originate from the south end of the valley and flow in a north-northwesterly <br />direction. During winter months, the valley experiences light, variable winds, less than 10 <br />miles per hour (mph). Low wind speeds, combined with low inversion layers in the winter, <br />create a climate conductive to high concentrations of certain air pollutants. <br />The California Air Resources Board (1984) analyzed wind data for the Stockton Airport weather <br />station for the period from 1964 to 1980. The prevailing wind for the Stockton station blows <br />from the west-northwest (45.3 percent of the time) and the north (15.9 percent of the time). <br />Calm winds occur 6.9 percent of the time. A wind rose (Figure 6) developed from the Stockton <br />WB Airport data provides wind direction information. The mean annual wind speed is 8.2 <br />miles per hour. <br />Forward Resource Recovery Facility SWT Engineering <br />Transfer/Processing Report -MayJ..u.1y 2014 <br />z:\projects\aliied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\tpr 2014\text\secl.doc