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County of Riverside 2 The project proposes to install approximately 31,872 REC 300 Watt modules or equivalent. In addition, there would be four (4) 2 MW AC Stations located near the vicinity of the arrays. The AC stations would consist of four (4) Advanced Energy 2 MW Power Stations with 2-1 MW inverters and transformers located on concrete foundations. There would be eighty (80) 20 circuit combiner boxes located within the arrays supported by the racking systems or independently held on individual ballasted structures. See the E500 Series Drawings in Appendix C, page 302 of this PDF. The system would tie into an existing Southern California Edison (SCE) substation located in close proximity and adjacent to the project site. The point of connection would occur at the Limonite 33 kilovolt (kv) line associated with the SCE Vista substation. Location The West Riverside Landfill (Landfill) is located in Riverside County. The Landfill is located adjacent to the west levee of the Santa Ana River, along the north side of State Highway 60 in the southeast quarter of Section 10, Township 2S, Range 5W, San Bernardino Base and Meridian. It is bound by Hall Avenue and homes on the west, and by 28th Street and a recreational go-cart track on the north. The entrance to the site is at 2700 Hall Avenue. The site location is shown on Figure 1. A map showing the current land use within 1,000 feet of the site boundaries is provided as Figure 2. CEQA An Initial Study/Mitigated Negative Declaration (IS/MND), dated April 2014, for the West Riverside Solar Project has been prepared to address the environmental concerns associated with the proposed change in land use at West Riverside Landfill. Certification of the IS/MND is required for this project to be implemented. 3 EXISTING FACILITIES Landfill and Final Cover The landfill has been maintained as an open space since its closure in 1983. The 74-acre site has a final closure cover that meeting the prescriptive requirements of California Code of Regulations (CCR) Title 23, Chapter 15 and Title 14, Chapter 3. The cover consists of the following layers.  2-foot foundation layer  1-foot low permeability soil layer (less than 1 X 10-6 cm/sec)  2-foot vegetation layer The total thickness of the cover is 5 feet. The final grades at closure are shown on Figure 5. The current topographic map is presented as Figure 3. A comparison of the grades between closure and current grades indicates an average settlement of the cover of approximately 4 feet. The landfill is maintained under the regulatory agency approved Closure and Post-Closure Maintenance Plan prepared by The Earth Technology Corporation on July 26, 1991, revised