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City of Santa Ana Addendum to the <br />MainPlace Mall Transformation Proiect Fashion Square Commercial Center Final EIR <br />quality of storm water discharges during construction, and describe the implementation <br />and maintenance of erosion control and sediment control BMPs. Maintenance of <br />erosion control and sediment control BMPs would be implemented to reduce or <br />eliminate sediment, pollutants adhering to sediment, and other non -sediment pollutants <br />in storm water, as well as non -storm water discharges during construction. In addition, a <br />Qualified SWPPP Practitioner (QSP) would ensure compliance with the SWPPP <br />through regular monitoring and visual inspections during construction activities. <br />Construction BMPs that would be in place during storm events, as required by the <br />Construction General Permit, would reduce the potential for stormwater to come into <br />contact with pollutants and integrate pollutants into surface water. <br />Common types of construction BMPs include: <br />• Silt fencing, fiber rolls, gravel bags . Hydroseeding <br />• Street sweeping and vacuuming . Material delivery and storage <br />• Storm drain inlet protection . Stockpile management <br />• Stabilized construction . Spill prevention and control <br />entrance/exit . Solid waste management <br />• Vehicle/equipment maintenance, . Concrete waste management <br />cleaning, and fueling <br />Compliance with the Construction General Permit and a SWPPP prepared by a <br />Qualified SWPPP Developer and implemented and monitored by a Qualified SWPPP <br />Practitioner would prevent construction -related impacts related to drainage and water <br />quality. The SWPPP would be verified by the City's engineering department during the <br />permitting approval process and compliance would be verified by the QSP. As a result, <br />construction activities would not result in runoff that would exceed the capacity of the <br />drainage system or provide substantial additional sources of polluted runoff, and <br />impacts related to hydrology would be less than significant. No new impacts would <br />occur. <br />Operation <br />The Project site is developed and largely impervious (92 percent) with some pervious <br />landscaping areas (8 percent). The proposed Project would result in a 14 percent <br />increase in pervious area on the site through the provision of new open space areas <br />and new landscaping (WQMP 2019). With implementation of the Project, 22 percent of <br />the site would be pervious, which would improve runoff infiltration over the existing <br />condition. <br />The Water Quality Management Plan (WQMP) for the site describes that the Project site <br />is currently served by an existing storm drain system that ranges in size from 12-inches <br />to 30-inches in diameter and discharges to the following different locations: 1) a 36-inch <br />storm drain in Main Street at the intersection of Town and Country Road; 2) a 30-inch <br />drain that crosses Main Place Drive and connects to the adjacent Caltrans drainage <br />system; 3) an on -site storm drain system that surrounds the mall building and connects <br />RE <br />