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Figure 4 presents an isohyeta) 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 isohyeta) precipitation map divides the <br /> whole of San Joaquin County into three rainfall intensity zones. The project site <br /> is located in Zone 2 of the three rainfall zones, as shown on Figure 4. Mean <br /> annual precipitation for Zone 2 on the San Joaquin County isohyetal <br /> precipitation map is approximately 13.5 inches. <br /> Specific precipitation intensities are- ase ,on precipitation data from the Stockton <br /> weather station number B00-8560, located approximately 8 miles northwestwofrthe <br /> site at latitude 38°00', longitude 121°316', and an elevation of 12 feet National <br /> Geodetic Vertical Datum (N`GVD)''(Ca1if6rnia`Department of Water Resources, <br /> 1981). This precipitation was selected due to its long and reliable period of record <br /> 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 cif-4.11 inches <br /> • 100-year annual precipitation of 25.42 inches <br /> • Annual mean precipitation of 14.27"inches <br /> 3.2.3 EVAPORATION <br /> The estimated annual evaporation for the site is 78.43 inches based on Pan A <br /> evaporation data recorded between 1919 and 1968 at Oakdale Woodward'Dam- <br /> (Station No. B00 630500, latitude 37151'28", longitude 120°52'42", Elevation <br /> 215 feet amsl), located approximately 13 miles southeast of the site (California <br /> Department of Water Resources, 1979). A minimum mean monthly evaporation <br /> of 1.14 inches has been calculated for December and January, and a maximum <br /> mean monthly evaporation of 14.69 inches has been calculated for July. <br /> 3.2.4 WIND <br /> The California Air Resources Board (1984) analyzed wind data for the Stockton <br /> WB Airport for the period from 1964 to 1980. The prevailing wind for the <br /> Stockton station blows from the west-northwest (45.3 percent of the time) and the <br /> Forward Landfill jTD 3-2 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-3.0:08/20/01 <br /> BRYAN A.STIRRAT S ASSOCIATES <br />