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4.0 WASTE MANAGEMENT UNIT CHARACTERISTICS 0 4.1 TOPOGRAPHY The site and surrounding areas consist primarily of gently rolling pasture. Fig- ure 4-1 shows topographic features, ground surface elevation contours, natural slopes, and drainage patterns within 1 mile of the site. The NCSL site is at 38006' latitude, 121009' longitude on the 7.5 minute Linden, California topo- graphic quadrangle produced by the U.S. Geological Survey. Two branches of south Paddy Creek, represented by the natural drainage channels entering the east perimeter, traverse the north -central portion of the site. Water in these channels flows to the northwest. Four ponds are present on the site: two are as- sociated with drainage, and two are man-made and are used for irrigation and livestock. The southwest corner of the site drains toward the south and west to intermittent streams. Elevations at the site generally range from approximately 106 feet mean sea level (MSL) in the northwest corner to 123 feet MSL in the southeast corner. Three gentle hills in the site's northern portion rise to elevations ranging from 118 to 124 feet MSL. Two potential flood hazards concern much of the San Joaquin County: flooding of natural water courses during storms, and inundation caused by failure of nu- merous dams in the area. Review of the Flood Insurance Rate Maps (FIRM) and the Safety/Seismic Safety Element of the San Joaquin County General Plan shows that the landfill site is not within a 100 -year floodplain (see Figures 4-2 and 4-3). The site is located within Flood Zone C, which is an area subject to minimal flooding. In addition, the site is not located within the inundation areas of New Hogan Dam or Comanche Dam identified by the U.S. Army Corps of Engineers (see Figures 4-4 and 4-5). 4.2 CLIMATE The site has a Mediterranean climate typical of the northern San Joaquin Valley. Winters are cool and moist, while summers are hot and dry. The mean daily PJ9 9390218A.00W 18 Rev. 0 July 20, 1989