2014-028 - Approving General Plan Amendement No. 2014-01

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City of Santa Ana -Park View at Town and Country Manor Draft EIR and would be developed specifically for the project and documented in the SWPPP that would be prepared for the project and kept onsite at all times during construction. The project will comply with NPDES and SWPPP requirements to implement BMPs to reduce impacts associated with water quality during grading and construction. Additionally, conformance with the provisions of the Uniform Building Code and the City's Grading Code, requiring reduction of erosion and sedimentation, is also required. Short-term construction and grading impacts are, therefore, considered to be less than significant. Operational Phase The Town and Country Manor campus occupies approximately 8.29 acres. The existing building area footprint is 219,556 square feet. The building footprint plus parking lot areas is currently 3.54 acres. The proposed project will increase lot coverage to 4.95 acres. As a percentage of site area, the proposed lot coverage will be 59.7 percent. Impermeable area constitutes 42 percent of the existing campus. The proposed project would increase impermeable area to 60 percent of the campus. Existing landscape areas will remain, with the exception of the grassy area within the project site which will be removed, and new landscape areas will be designed and maintained per City of Santa Ana guidelines. The project architect, Irwin Pancake Architects, is currently working with the City to revise the lot coverage requirements for the project. The proposed project would increase lot coverage and result in the conversion of permeable surfaces to impermeable surfaces. The project engineer, Hall and Foreman, Inc., estimates that project runoff will increase by 1.5 cubic feet per second (cfs) with the increased lot coverage. Upon development of proposed uses, storm runoff from the newly constructed structures and paved surfaces could carry, and be tainted by, a variety of pollutants such as sediment, petroleum products, commonly utilized construction materials, landscaping chemicals, and (to a lesser extent) trace metals such as zinc, copper, lead, cadmium, and iron, which may lead to the degradation of storm water in downstream channels. Runoff from landscaped areas could contain elevated levels of phosphorous, nitrogen, and suspended solids. Oil and other hydrocarbons from vehicles are also expected in storm water runoff. Nutrients from this runoff could promote algae growth in Santa Ana River and its tributaries as well as contribute to degradation of surface water quality. Pollutant concentrations in urban runoff are extremely variable and are dependent on storm intensity, land use, elapsed time since previous storms, and the volume of runoff generated in a given area that reaches a receiving water. As such, potential water quality impacts are related to the increase in the peak runoff, new urban uses, and the sensitivity of the receiving water. Development of the project could result in increased peak flow and pollutant loads in the local drainage ways and the Santa Ana River. Michael Brandman Associates 4.3 -7 H\Cl t(PN- JN)b32]b327W3MMVB2]0030 Se 4B Hyd bUadWat Wity.d¢