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Piutlic•o Drive Turnout curd Pipelir:e Project Envirouureutal Checklist $$Qe$ Potentially' Significant Impact Les than Significant With Dli[igatimt Incorporated Less than Significant Impact \b Impact h) Place within a 100-year flood hazard area ^ ^ ^ structures which would impede or redirect flood Mows? i) Expose people or structures to a significant risk ^ ^ ^ ^ of loss, injury or death involvingg flooding, as a result of~the failure of a din di fl i l g ng oo nc u levee or dam'? j) Inundation by seiche, tsunami, or mudflow? ^ ^ ^ ^ Discussion a, e, f) Less than Significant. Construction activities have the potential to increase erosion and result in sediment laden surface water runoff being discharged to storm drains near the project area. Grading activities at the fluoridation building site, excavation at the two project vaults and earth disturbing activities along the pipeline could cause soil erosion and sediment laden runoff to the storm drain system. As discussed in the Project Description and Section 6, Geology and Soils, a Storm Water Pollution Prevention Plan (SWPPP) will be developed and implemented as part of this project per the City of Pleasanton's Starulard Specifications and Details (2002). The SWPPP will identify BMPs necessary to prevent adverse impacts to water quality from sediments or excavated material from entering the storm drain system during construction to prevent violations of water quality standards and waste discharge requirements and follow BMPs in the California Kegional Water Quality Control Board's "Erosion and Sediment Control Field Mmlual " (latest edition) and the Association of Bay Area Government's "Manual o~ Standards for Erosion & Sediment Contr•oi Measures" (latest edition). Operation of the pipeline and vaults will not result in discharge to surface waters, introduce pollutants into storm water runoff, or alter groundwater or surface water quality. The pipeline and other project facilities will be designed to seismic and other standards to avoid potential for pipeline rupture or facility failure from seismic activity as described in the Project Description. The fluoridation building will be designed to state and federal standards including secondary containment to prevent in the case of an accident, leak or failure of the chemical tank any chemical from moving off the site and entering the storm drain system. Potential impacts to water quality are, therefore, less than significant. b) Less than Significant. The project will not use groundwater. The project facilities will increase impervious surfaces in the area by less than 0.06 acres (approximately ?,450 square feet). 'fhe entire project area is urbanized and the amount of impervious surfaces associated with the project is small. The project will not significantly increase the City of Pleasanton 36 Winzlcr & Kelly Draft Initial Study/Proposed Negative Declaration August ?006 04?G3501