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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). A <br /> topographic map of the site and the surrounding region within a mile of the landfill perimeter is <br /> presented on Plate 6. The topographic map is a 1968 (revised 2004) USGS map of the Linden <br /> quadrangle. The topographic map shows the predevelopment contours of the site and <br /> surrounding areas. The elevation at the site varies between approximately 109 and 189 feet <br /> MSL. Predevelopment elevation at the landfill ranged between 115 and 118 feet MSL. Land <br /> within a mile of the site varies from approximately 100 on the western side of the site and 150 <br /> feet MSL northeast of the site(predevelopment). <br /> 5.2 CLIMATOLOGY <br /> 5.2.1 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 developed in"Storm Drainage Study and <br /> Master Plan, San Joaquin County, January 1973". <br /> 5.2.2 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, and is outside all documented floodplain boundaries <br /> (Plate 8). The site and surrounding areas are located in Zone C, which is identified as "Areas of <br /> minimal flooding". Drainage from the site will be routed through detention basins and into an <br /> existing offsite drainage system (also see Section 5.2.5). <br /> North County RC&SL Page 17 of 48 Public Works/Solid Waste <br /> JTD County of San Joaquin—November 30,2004 <br />