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4.5. Topography <br />The predevelopment contours of the site show the slope of the site to be northwest to southeast <br />(Plate F_ i�u�e 4-7I) <br />wn Appendix G, fFoFn 1962 USGS map of the Valley SpFings SW quadFangle). <br />The present topography varies elevation of the site Fang es• from approximately 220 to 360 mean <br />sea level (MSL) (Figure 2). The tonogranhin gradient isgenerally from the northwest to the <br />4.6. GLIMATOL Climatology <br />4.6.1 Isohyetal Map and Precipitation <br />An -The isohyetal map for the region shows +ng -the rainfall min the vicinity of <br />the landfill is ^rep, ent„tea-inapproximately 17.5 inches per year (-Plate 7XXFigure 9-Geald <br />Oe,Q. The isehyetal Map of San jeaquin GeuRty was obtained from the dOGUment <br />"StOFrA IDFainage Study and MasteF Plan, San jeaquin County, januaFy 1973". The <br />nlimate in the Vicinity of the landfill is demi arid <br />4.6.2 Floodplain <br />Foothill Sanitary Landfill Page 27 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — Revised 7/30/10 <br />