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expansive soils, and subsidence. Potential seismic impacts, including ground <br />shaking, surface rupture, liquefaction, and landslides will be described. <br />Additionally, potential impacts related to geotechnical soil properties, such as <br />erosion, expansive soils, and subsidence will be described. The Planning Center <br />DC&E's senior geologist, with 30 years of experience, will review the draft General <br />Plan policies pertaining to geology, soils, and seismicity, and suggest revisions to <br />these policies or new policies, if necessary, in order to mitigate potential <br />geotechnical impacts. <br />h. Hazardous Materials <br />The Planning Center I DC&E will prepare the "Setting" section of the EIR on <br />Hazardous Materials, relying on the data collected and presented in Task 4. The <br />Planning Center I DC&E will evaluate potential impacts associated with the use of <br />hazardous materials during construction and land use operations. Potential impacts <br />associated with development in areas with known or potential subsurface <br />contamination and associated with aviation hazards, wildland fires, and emergency <br />response and evacuation procedures will also be discussed. Potential public health <br />and safety concerns in the city also may include demolition or renovation of <br />buildings containing hazardous materials, and the proper management of <br />hazardous materials during construction and land use operations. Mitigation <br />measures will be described as appropriate. <br />i. Hydrology and Water Quality <br />The Planning Center I DC&E will utilize the existing conditions information <br />collected in Task 4 to complete the "Setting" section of the Hydrology and Water <br />Quality chapter. They will then assess impacts and identify mitigation measures. <br />Development under the General Plan Update may change impervious surface areas <br />and alter drainage patterns. Based on a review of available information, it is <br />anticipated that impacts relating to hydrology and water quality may include an <br />increase in stormwater runoff volume and resultant degradation of water quality <br />unless appropriate mitigation measures are implemented. This potential impact will <br />be described qualitatively. Potential impacts associated with the discharge of urban <br />pollutants (petroleum hydrocarbons and heavy metals associated with automobile <br />use) will also be described. Regulations and policies to reduce storm water <br />pollution during the construction and operational phases of future projects will be <br />described in detail. <br />This scope assumes that the City will provide maps of the current storm drain <br />system and identify any constraints associated with future development within the <br />General Plan area. <br />