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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />c) Substantially alter the existing drainage pattern of area, including through the <br />alteration of the course of a stream or river or through the addition of impervious <br />surfaces, in a manner which would: <br />(i) result in substantial erosion or siltation on- or off -site; <br />Less than significant impact. Project construction activities such as demolition, grading, paving, <br />and site improvements may result in loose sediment, which can be transported by surface water or <br />wind into nearby storm drains and waterways. <br />The proposed project would not alter the course of a stream or river as the Santa Ana River is located <br />approximately 4 miles west of the project area. The proposed project would involve construction in an <br />area that is currently covered by a gravel parking lot. As described above, the project site is currently <br />used for parking and is heavily compacted due to daily vehicular use. The proposed project would not <br />substantially alter the existing drainage pattern of the site in a manner that would result in substantial <br />erosion or siltation on- or off -site. As such, impacts related to the alteration of existing drainage <br />patterns in the area that could result in substantial erosion or siltation on- or off -site would be less <br />than significant. <br />(ii) substantially increase the rate or amount of surface runoff in a manner which <br />would result in flooding on- or off -site; <br />Less than significant impact. Project construction activities such as demolition, grading, paving, <br />and site improvements may result in loose sediment that can be picked up by surface water or wind <br />into nearby storm drains and into waterways. The proposed project would not alter the existing <br />drainage pattern of the site and would not alter the path of a stream or river, as explained above. As <br />such, impacts related to the alteration of existing drainage patterns in the area that could result in <br />flooding on- or off -site would be less than significant. <br />(iii) create or contribute runoff water which would exceed the capacity of existing <br />or planned stormwater drainage systems or provide substantial additional <br />sources of polluted runoff; or <br />Less than significant impact. The proposed project would be served by the City's stormwater <br />drainage system. Construction activities such as demolition, grading, and paving could introduce <br />additional pollutants and sediment into water runoff and flow into nearby storm drains. Continuous <br />use and operation of the site would not create or contribute runoff water that would exceed the <br />capacity of existing stormwater drains on the project site with implementation of these BMPs. <br />Therefore, impacts are considered less than significant. <br />(iv) impede or redirect flood flows? <br />No impact. The project site is not located within a floodplain. The proposed project would not add <br />additional impervious surfaces or alter the course of a stream or river. Therefore, there are no impacts <br />related to impeding or redirecting flood flow would occur. <br />FCS 69 <br />Https://adecinnovations.sharepoint.com/sites/PubiicationsSite/Shared Documents/Publications/Client(PN-JN)/D327/03270D47/ISMND/0327D047 Santa Ana Rezone Project ISMND.docx <br />