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i~ i~ i~ Environmental Checklist For CEQA Compliance A. Less Than Significant with Mitigation Incorporated. The City of Santa Ana is included within four watersheds: San Diego Creek, Santa Ana River, Talbert, and Westminster. Each of these watershed areas are under the jurisdiction of the Santa Ana Regional Water Quality Control Board and subject to the objectives, water quality standards, and best management practice requirements established in the Santa Ana River Basin Plan and Orange County Drainage Area Management Plan (DAMP). The City of Santa Ana Storm Water Management Program Ordinance (Municipal Code Ch. 18) governs all projects within the City to comply with the Orange County DAMP and the Santa Ana Regional Water Quality Control Board MS4 permit, which is the National Pollutant Discharge Elimination (NPDES) permit that governs stormwater discharges into the public storm system (MDS Consulting 2007:1). The City of Santa Ana does not contain any impaired water bodies, as defined by Section 303 of the Clean Water Act. However, the City does contain several drainage facilities that convey surface water runoff into bodies of water that are classified as impaired. During construction, runoff from the project site would be managed by best management practices (BMPs) and would be managed as directed in the City's stormwater protection requirements. BMPs include, but are not limited to, treatments such as private storm filters and catch basins, the minimization of directly connecting impervious areas, education of property owners, activity restrictions in certain areas of the property, and regular street sweeping. Therefore, the proposed project would result in aless-than-significant impact to water quality standards and waste discharge requirements during construction of the project. The existing site consists of approximately 40% pervious surface runoff from the project area, which includes two landscaped areas located along the western boundary of the site and the unpaved areas located along the eastern and southern boundaries (MDS Consulting 2007:6). The proposed project would reduce the pervious area by half, to approximately 20% of the site (MDS Consulting 2007:6). The proposed project is classified as a Priority Project Category 1 per the Countywide Orange County Storm Water Program (MDS Consulting 2007:1). Therefore, after development of the proposed project, treatment control BMPs are required to remove pollutants typically associated with urban runoff (MDS Consulting 2007:5). Pollutants typically associated with urban runoff include nutrients, pesticides, sediment, trash and debris, bacteria and viruses, and oil and grease. ~~ BMPs included in the Water Quality Management Plan, already prepared for the proposed project, would limit impacts from project site runoff. These BMPs identified in the WQMP include, but are not limited to: • Onsite structural BMP treatments such as private storm filters and catch basins and the minimization of directly connecting impervious areas. • Nonstructural BMPs such as HOA management of BMPs operation through appropriate Codes, Conditions, and Restrictions (CC&Rs), education of property owners, activity restrictions in certain areas of the property, and regular street sweeping. Impacts are therefore considered less than significant with Mitigation Measure WQ-1, identified below, incorporated. Alton Court Initial Study/Mitigated Negative Declaration 3-27 August 2007 J&S 00635.07 ~ 75A-93