Canyon Springs Draft Environmental Impact Report
Canyon Springs DEIR by Chapter
12/19/2012 1:52:33 PM
12/19/2012 1:52:07 PM
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4.9 HYDROLOGY AND WATER QUALITY <br />4.9-1 <br /> <br /> <br />A. Introduction <br />This section addresses impacts of the proposed project on hydrology, water <br />quality, and flooding within the site and its surroundings. The analysis con- <br />tained within this section considers all short-term hydrologic impacts associ- <br />ated with construction and long-term impacts associated with buildout of the <br />Canyon Springs Subdivision, and addresses all factors contained within Ap- <br />pendix G, Environmental Checklist, of the California Environmental Quality <br />Act (CEQA) Guidelines. This analysis is based on review of available reports, <br />regulatory documents, site-specific environmental investigations, and site re- <br />connaissance conducted in August 2011. Based on this information, this sec- <br />tion describes potential impacts that may result from the proposed project <br />and identifies mitigation measures to reduce potential impacts to a less-than- <br />significant level, if feasible. <br /> <br /> <br />B. Regulatory Framework <br />This section summarizes existing local, state, and federal laws, policies, and <br />regulations that apply to potential hydrology, water quality, and flooding <br />impacts associated with the proposed project. <br /> <br />1. Federal Laws and Regulations <br />a. Clean Water Act <br />Under the Clean Water Act (CWA) of 1977, the US Environmental Protec- <br />tion Agency (EPA) seeks to restore and maintain the chemical, physical, and <br />biological integrity of the nation’s waters. The statute employs a variety of <br />regulatory and non-regulatory tools to reduce direct pollutant discharges into <br />waterways, finance municipal wastewater treatment facilities, and manage <br />polluted runoff. The CWA authorizes the EPA to implement water quality <br />regulations. The National Pollutant Discharge Elimination System (NPDES) <br />permit program under Section 402(p) of the CWA controls water pollution <br />by regulating stormwater discharges into the waters of the United States. <br />California has an approved state NPDES program. The EPA has delegated <br />authority for water permitting to the State Water Resources Control Board
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