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ATTY/RESO.0112/BUILDING & FIRE CODE ADOPTIONS <br />REV: 11-21-16 RL <br />Page 2 of 4 <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 fall <br />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 area, <br />create a hazardous fuel condition, which further creates extensive grass and brush <br />land fire risk. With residential developments encroaching into these wooded and grass, <br />or brush-covered areas, wind and terrain-driven fires could have severe consequences <br />to improved properties at risk. This has been demonstrated on several occasions in <br />other areas of our State Fire/Rescue Aid Regions. <br />4. Geological: <br /> <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 approximately <br />19 square miles and 80,000 people. <br />D. Roads and Streets. The number of vehicle miles driven is steadily increasing despite <br />limited growth. Many older streets are narrow and steep. The impact of additional <br />planned developments and increased traffic flow will continue to create an effect on <br />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) feet <br />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 western <br />side. Slopes range from (0) degrees to more than (20) degrees on some streets. <br />F. Vegetation. The hilly portion of the City of Redwood City contains trees, dense brush <br />vegetation and a heavy growth of natural grasses. The City and surrounding areas <br />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 to <br />corrosion. <br />6.4.B. - Page 33