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FINDINGS OF FACT Amendments To State Code Based Upon Local Geologic, Topographic, and/or Climatic Conditions Findings of fact for the following Redwood City Code Sections are hereby submitted: 1. SECTION 9.43 - Slab reinforcement and membrane. Redwood City soil conditions, particularly in areas of future development are predominantly adobe or underlain by bay mud. These expansive soils also do not allow for good drainage. Experience has demonstrated that slab reinforcement and vapor barriers in dwelling units are essential to protect new construction from future damage due to these conditions. 2. SECTIONS 9.82 THROUGH 9.87 -Restrictions on metallic underground and plastic piping. Experience has demonstrated that the Younger Bay Mud soils are corrosive to metallic piping installed underground. Redwood City prohibits the installation of metallic drain, waste, vent, sewer, gas, and water piping underground in Younger Bay Mud areas. Redwood City continues to prohibit the expanded use of plastic plumbing piping beyond the 1979 Uniform Plumbing Code provisions until the state certifies the environmental impact report for the expanded use of plastics. Even though this state restriction applies only to residential buildings (those regulated by the State Department of Housing and Community Development), Redwood City elects to apply this restriction to all buildings. 3. SECTION 9.113 - Shunt trip. In multi-story structures the electrical equipment room could be located in a basement or recessed area. Access to and locating the electrical equipment room or area during an emergency situation would in some cases be through or into an area where toxic smoke and liquids were present creating a hazardous, life-threatening condition. Being in the midst of"high-tech" industries, there is a high probability that hazardous materials are present. Redwood City is also susceptible to potential flooding due to the relatively high water table. The operation of the "shunt trip device" push button would disconnect electric power to the structure. This operation would be from a safe location outside of the building. 4. SECTION 9.114 -Low voltage wiring above suspended ceiling. Computers,data services information services common to all office spaces requires low voltage wires to be installed. The wiring is usually installed just before the offices are occupied. The installers, unless instructed or warned otherwise, install the computer, data phone, etc. wire by laying directly over and on the T-bar grid system, panels, and fixtures. 11882