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during that period, a minimum annual precipitation of 8.02 inches during the service life and postclosure period of the landfill site was estimated. Table 3.6 Local Climatological Data Stockton Metropolitan Airport Year (inches) Month 1987 1988 1989 1990 1991 January 2.03 1.97 0.37 2.23 0.17 February 3.28 0.31 1.07 1.30 2.32 March 2.84 0.19 2.16 0.86 5.35 April 0.12 1.98 0.07 0.52 0.45 May 0.02 0.54 0.07 2.33 0.12 June 0.00 0.23 0.21 0.00 0.11 July 0.00 0.00 0.00 0.00 0.02 August 0.00 0.00 0.00 0.00 0.07 September 0.00 0.00 2.06 0.00 0.00 October 1.04 0.1 0.87 0.20 1.98 November 1.31 1.36 1.11 0.45 0.34 December 2.41 2.28 0.03 0.91 0.76 Total 13.05 8.96 8.02 8.80 11.69 As shown in Figure 3.2 the Forward site is not located within the 100- flood lain. g � ear plain. The entire landfill site is within flood zone designation C, which encompasses areas of minimal flooding during the 100-year 24-hour storm event (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 flood plain. Since the tlandfill site is not located within the 100-year flood plain, an engineering analysis to deter- mine hydrodynamic forces that would result from such an event is not necessary, as speci- fied by Section 2595(d)(2) of Chapter 15, Title 23. Evaporation. The estimated annual evaporation for the site is 78.43 inches based on evaporation data recorded between 1919 and 1968 at Oakdale Woodward Dam (Station No. B00 630500, latitude 37°51'28", longitude 120°52'42", Elevation 215 msi), 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. wa10029B5C.W'P 5/65 9/29/94 65