Laserfiche WebLink
Section 4.0 – Environmental Setting and Discussion of Impacts <br /> <br /> <br />City of Redwood City 60 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />HYDROLOGY AND WATER QUALITY <br /> Potentially <br />Significant <br />Impact <br />Less Than <br />Significant <br />With <br />Mitigation <br />Incorporated <br />Less Than <br />Significant <br />Impact <br />No Impact Beneficial <br />Impact <br />Information <br />Source(s) <br />Would the project: <br />7) Place housing within a 100-year <br />flood hazard area as mapped on a <br />Federal Flood Hazard Boundary or <br />Flood Insurance Rate Map or other <br />flood hazard delineation map? <br /> 1,16 <br />8) Place within a 100-year flood <br />hazard area structures which <br />would impede or redirect flood <br />flows? <br /> 1,16 <br />9) Expose people or structures to a <br />significant risk of loss, injury, or <br />death involving flooding, <br />including flooding as a result of <br />the failure of a levee or dam? <br /> 1,16 <br />10) Be subject to inundation by seiche, <br />tsunami, or mudflow? <br /> 1,17 <br /> <br /> <br />4.9.3 Hydrology and Water Quality Impacts <br /> <br />4.9.3.1 Water Quality Impacts (Checklist Questions 1, 5, and 6) <br /> <br />Construction Impacts <br /> <br />Construction of the proposed project, including demolition, grading and excavation activities, could <br />result in temporary impacts to water quality. In addition to generating dust, litter, oil, and pollutants <br />that could contaminate runoff from the site, construction activities would increase the potential for <br />erosion and sedimentation by disturbing and exposing underlying soil to the erosive forces of water <br />and wind. The project site is approximately 0.77 acres and, therefore, would not require coverage <br />under the NPDES General Permit for Construction Activities. As required under the MRP, however, <br />the proposed project would implement the following construction best management practices (BMPs) <br />to reduce impacts to surface water quality from construction activities: <br /> <br />• Control and prevent the discharge of all potential pollutants, including pavement cutting <br />wastes, paints, concrete, petroleum products, chemicals, wash water or sediments, rinse water <br />from architectural copper, and non-stormwater discharges to storm drains and watercourses. <br />• Store, handle, and dispose of construction materials/wastes properly to prevent contact with <br />stormwater. <br />• Do not clean, fuel, or maintain vehicles on-site, except in a designated area where wash water <br />is contained and treated. <br />7.A. - Page 91