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8.B. - Page 61 <br /> Because the proposed project will add or replace less than 10,000 sf of impervious surfaces,the <br /> project is not required to comply with the SMCWPPP Municipal Regional NPDES Permit. Pursuant <br /> to Section 32.12 of the City's Zoning Ordinance,the project is required to comply with Section 32.12 <br /> subsections C, D, E, and F, and Chapter 27A of the Municipal Code. A stormwater control plan <br /> (SWCP)was prepared for the project that includes appro�mately 21,347 sf of pervious areas <br /> including pervious pavement,vegetated bioswales, and landscaping consisting of groundcover, <br /> shrubs, and trees around the perimeter of the site. These areas are numerically sized to adequately <br /> treat stormwater consistent with City and RWQCB requirements, and would serve to percolate <br /> stormwater on the project site through the soil and filter runoff through vegetation. To optimize on- <br /> site stormwater filtration the site would be graded to direct the flow of stormwater into the vegetated <br /> swales between the proposed residences prior to entering a detention pipe that empties into Redwood <br /> Creek. <br /> The proposed stormwater treatment facilities will have sufficient capacity to treat all the stormwater <br /> runoff entering the storm drainage system. In addition,the project will be required to record an <br /> Operation &Management Agreement to ensure continued maintenance and performance of post- <br /> construction measures. Implementation and maintenance of the proposed treatment system will <br /> result in a less than significant impact on water quality. (Less Than Significant Impact) <br /> The increase in runoff from the site will be minimal. As discussed in Section 4.17, Utilities, the <br /> majority of stormwater runoff will drain into Redwood Creek. A small portion of runoff from Lot 1 <br /> will drain onto Valota Road and into the roadway's stormdrains. The existing infrastructure has <br /> sufficient capacity to convey the minimal increase in runoff from the site. Redevelopment of the <br /> project site with an increase in impervious surfaces will have a less than significant impact on the <br /> e�sting storm drainage system. (Less Than Significant Impact) <br /> 4.9.2.3 Groundwater <br /> The depth to groundwater at the project site is appro�mately 20 ft. bgs and the project would not <br /> interfere with groundwater flow or expose any aquifers. The project would not impact aquifer <br /> recharge. (Less Than Significant Impact) <br /> 4.9.3 Conclusion <br /> With implementation of the construction measures listed above and the proposed SWCP,the project <br /> would have a less than significant impact on water quality. The project would not deplete the <br /> groundwater supply, increase storm water runoff, or expose people or structures to flood hazards. <br /> (Less Than Significant Impact) <br /> 1410 Valota Road Residential Project 49 Initial Study <br /> Redwood City January 2012 <br />