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5 PHYSICAL SETTING <br /> 5.1. TOPOGRAPHY <br /> A recent (August of 2004)topographic map of the site is shown in the site plan (Plate 2.1). A <br /> topographic map of the site and the surrounding region within a mile of the landfill perimeter is <br /> presented on Plate 6. <br /> The predevelopment contours of the site show the slope of the site to be northwest to southeast <br /> (Plate 1 in Appendix C, from 1962 USGS map of the Valley Springs SW quadrangle). The <br /> elevation of the site ranges from approximately 220 to 360 mean sea level (MSL). The <br /> topographic gradient is generally from the northwest to the southeast. <br /> 5.2. CLIMATOLOGY <br /> 5.2. Isohyetal Map <br /> An isohyetal map showing the rainfall distribution in the vicinity of the landfill is presented in <br /> Plate 7. The isohyetal Map of San Joaquin County was obtained from the document "Storm <br /> Drainage Study and Master Plan, San Joaquin County, January 1973". The climate in the <br /> vicinity of the landfill is semi-arid. <br /> 5.2.1. Floodplain <br /> Federal Emergency Management Agency (FEMA) flood maps for the landfill and areas <br /> surrounding the landfill were reviewed. The site has been evaluated with respect to current 100 <br /> year flood maps (Flood Insurance Rate Map, San Joaquin County, California (unincorporated <br /> Areas), Panel 365 of 925, May 1980, show the landfill to be outside all documented floodplain <br /> boundaries. The site and surrounding areas are located in Zone C which is identified as "Areas <br /> of minimal flooding". <br /> Foothill Sanitary Landfill Page 19 of 62 Public Works/Solid Waste <br /> JTD County of San Joaquin—Revised 10/6/05 <br />