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KLEINFELDER 5 SITE CHARACTEM171CS Elements of the closure design are dependent on climatology, geology, hydrology and hydrogeology. Information used in preparation of the closure plan is presented in this chapter. 5.1 CLIMATOLOGY The data resented in this section was obtained from the California meet of Water P Depart Resources (DWR). The climatology of the site is based on the data collected from three climatological stations, the Stockton Airport, Stockton Fire Station, and the Stockton Mowry Bridge. At the Stockton Airport precipitation data was collected from 1949 to 1980. The Stockton Fire Station precipitation data was collected from 1868 to 1980. Evaporation data was collected at the Stockton Mowry Bridge from 1956 through 1963. Inclusion of the Stockton Fire Station as a climatological station is due to limited data available from the Stockton Airport. Approximate locations of these stations are shown on Plate 1-1. 5.1.1 Precipitation 5.1.1.1 Annual Precipitation The mean annual precipitation for the site, as indicated from available data, is approximately 14 inches. Tables 5-1 and 5-2 summarize the annual precipitation data obtained from Stockton Airport and the Stockton Fire Station, respectively. The maximum annual precipitation at Stockton Airport is 23.75 inches, recorded in 1973 and the minimum annual precipitation is 2.75 inches, recorded in 1968. The Stockton Fire Station has a maximum annual precipitation of 25.21 inches, recorded in 1958, and the minimum annual precipitation is 6.06 inches, recorded in 1913. 5.1.1.2 Monthly Precipitation Mean monthly precipitation at the Stockton Airport varies from approximately 2.75 inches in January to 0.05 inches recorded in July. The mean monthly precipitation from the Stockton Fire Station varies from 2.95 inches in January to 0.02 inches recorded in July and August. CR14-92-12 Page 13 of 39 24-220109-1709 Copyright 1992 Kteinfetder, Inc.