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WASTE DISCHARGE REQUIREMENTS FOR -3- KEARNEY-KPF CLOSURE OF SURFACE IMPOUNDMENTS SAN JOAQUIN COUNTY edge of the facility and is immediately east of the Southern Pacific Railroad. The ditch has no inlet or outlet. 12. Land within 1000 feet of the facility is used for domestic and industrial purposes. 13. Silty clays and clayey silts immediately underlie the surface impoundments and are of low permeability, low to moderate plasticity and are increasingly calcareous with depth. These soils are within the upper 40 inches of the subsurface and belong to the Landlow adobe clay soil series as classified by the United States Department of Agriculture. The Landlow adobe clay is considered to be a secondary mineral soil derived from transported materials of mixed origin and represents an immature soil developed on the outer margins of the basin. CLIMATOLOGY 14. The facility receives an average of 15.75 inches of precipitation per year as measured at the Stockton Fire Station between the years 1931 and 1983. The mean evaporation for this facility is 66.92 inches per year measured at the Lodi Station between the years 1941 and 1983. 15. The 100-year, 24-hour precipitation event for the facility is 3.25 inches and the 1000-year, 24-hour precipitation event for the facility is 4.11 inches as measured at the Stockton Fire Station. 16. The facility is not within a 100-year floodplain. GEOLOGY AND HYDROGEOLOGY 17. The Tracy-Stockton Fault trends easterly-northeasterly across most of San Joaquin County. Displacement has been estimated to be several thousand feet and resulted in a structural high known as the Stockton Arch with the upward movement on the south side of the fault. The maximum credible earthquake associated with the Tracy-Stockton Fault is 5+ with a ground acceleration of 0.11 feet per second' (ft/ sec') . The facility is approximately 3.5 miles north of the trace of the Tracy-Stockton Fault. 18. Non-marine sediments which include the Mehrten, Laguna and Victor Formations are present beneath the facility. All of the wells at the site are installed in the Victor or Laguna Formations. The Laguna Formation conformably overlies the Mehrten Formation and has a maximum thickness of 1000 feet in the Stockton area. The Victor Formation conformably overlies the Laguna Formation and has a maximum thickness of 150 feet.