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11 /28/2016 <br /> General Plan and associated environmental impact report. Modifications which are <br /> necessitated by particular local conditions are delineated below. <br /> 3. Climatic : <br /> The areas served by the City, on average, experience an annual rainfall between 8 to <br /> 18 inches . This rainfall can be expected between October and April of each year and <br /> is based on the 100 year weather almanac. However, during the summer and early <br /> fall months there is little, if any, measurable precipitation . During this dry period , the <br /> temperatures are usually between 70°-90° with light to gusty westerly winds. These <br /> drying winds, mixed with the natural vegetation , which is dominant throughout the <br /> area , create a hazardous fuel condition , which further creates extensive grass and <br /> brush land fire risk. With residential developments encroaching into these wooded <br /> and grass , or brush-covered areas, wind and terrain-driven fires could have severe <br /> consequences to improved properties at risk. This has been demonstrated on several <br /> occasions in other areas of our State Fire/Rescue Aid Regions . <br /> 4. Geological : <br /> A. Geographic Location . The area served by the City is located in San Mateo County. <br /> This area identified as being in the southern region of the county. <br /> B. Seismic Location. The relatively young geological processes that have created the <br /> San Francisco bay region are still active today. Seismically, the City sits along the <br /> active San Andreas Fault, and is rated as a Seismic Zone E . <br /> C . Size and population . Areas served by the Fire Department encompass <br /> approximately 19 square miles and 80, 000 people. <br /> D . Roads and Streets. The number of vehicle miles driven is steadily increasing <br /> despite limited growth . Many older streets are narrow and steep. The impact of <br /> additional planned developments and increased traffic flow will continue to create <br /> an effect on the delivery of fire protection services. <br /> E. Soil Conditions. The City of Redwood City lay's in the southern end of San Mateo <br /> County. The areas closest to the Bay are overlain by unconsolidated fine silty clay, <br /> known as Bay Mud , which varies in thickness from a few feet to as much as thirty <br /> (30) feet. Bedrock lies beneath the area at depths generally three hundred (300) <br /> feet or more. The topography is essentially flat, dropping from an elevation of eight <br /> hundred (800) feet to sea level. The slope of the city extends upwards on the <br /> western side. Slopes range from (0) degrees to more than (20) degrees on some <br /> streets. <br /> F. Vegetation . The hilly portion of the City of Redwood City contains trees, dense <br /> brush vegetation and a heavy growth of natural grasses. The City and surrounding <br /> areas suffer several wildland fires each year. <br /> G . Younger Bay Mud . Within the City, specifically along the San Francisco Bay, is <br /> underlain with Younger Bay Mud , which does not allow for infrastructure subject <br /> to corrosion . <br /> ATTY/RES0.0112/BUILDING & FIRE CODE ADOPTIONS RESO NO. 15540 <br /> REV: 11-21-16 RL MUFF NO. 305 <br /> Page 2 of 4 <br />