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2.5.1 TEMPERATURE <br /> Normal monthly temperatures were calculated from the Stockton Weather <br /> Station office (WSO) (No. 8558, latitude 37°54, longitude 121°15', Elevation <br /> 22 feet amsl), located approximately 3 miles west of the site, from data collected <br /> from 1948 through 1990. These temperatures ranged from a minimum average <br /> temperature of 42.5°F in January to a maximum average temperature of 78.0°F <br /> in August, with an annual mean temperature of 61.5°F (National Climatic Data <br /> Center, 1990). <br /> 2.5.2 PRECIPITATION <br /> Precipitation at the project site is typical of the Central Valley region. Rainfall is <br /> seasonal, with approximately 90 percent of the rainfall occurring between <br /> November and April. Snowfall is unusual at the site. <br /> Figure 3 presents an isohyetal precipitation map for San Joaquin County showing <br /> lines of equal precipitation on a countywide basis (San Joaquin County <br /> Department of Public Works, 1991). The project site is located in Zone 2 of the <br /> three rainfall zones identified, indicating a mean annual precipitation of <br /> approximately 13.5 inches. <br /> Specific precipitation intensities are based on precipitation data from the Stockton <br /> WBAP Station weather station number B00-8560, located approximately 8 miles <br /> northwest of the site at latitude 38°00', longitude 121'316', and an elevation of <br /> 12 feet National Geodetic Vertical Datum (NGVD) (California Department of <br /> Water Resources, 1981). This precipitation was selected due to its long and <br /> reliable period of record and its proximity to the project site. <br /> The precipitation depth-duration-frequency data for the site from the Stockton <br /> WBAP Station Number B00-8560 are: <br /> • 100-year, 24-hour storm intensity of 3.25 inches <br /> • 1,000-year, 24-hour storm intensity of 4.11 inches <br /> • 100-year annual precipitation of 25.42 inches <br /> • Annual mean precipitation of 14.27 inches <br /> Forward Landfill-Project Description 2-7 BRYAN A.STIRRAT&ASSOCIATES <br /> j:\Allied\Forward\2007.0018 Lateral Expansion\Reports\Prof Descrip\021308 Final Proj Des\Sec 2.doc:2/13/2008) <br />