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After completing a siting study that evaluated several alternate locations, IEC prepared plans, specifications, and final design of a new, larger reservoir tank to replace the Eastern Municipal Water District's (EMWD's) existing, understized 0.25 Ellis Tank near Perris in unincorporated Riverside County. The IEC team also prepared an IS/MND and Addendum for compliance with CEQA. The new tank project included a 3.5 MG welded steel tank; a reinforced masonry enclosure for inlet/outlet pipeline appurtenances and SCADA equipment; approximately 1,500 lf feet of paved access road; and approximately 4,000 linear feet of 12-inch diameter steel pipeline. The project added about 3.5 acres of hardscape to a previously unpaved area; due to the abscense of existing storm drain facilities, and to minimize impacts on natural drainages, design included development of an extensive drainage scheme providing a number of ditches and culverts for runoff management, as well as a stormwater retention basin that doubles as emergency overflow containment. In addition to surface hydrologic impacts, key environmental issues included the potential presence of host plants for the endagered Quino checkerspot butterfly, as well as habitat potentially suitable for Stephen's kangaroo rat and western burrowing owl. |
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Important Engineering Features • Design of 3.5 MG steel tank and appurtenant facilities • Design of retention basin for emergency tank overflow, maintenance draining, and stormwater run-off • Grading plan developed to minimize need for property acquisition and to accommodate existing natural drainage channels • Land acquisitions from multiple owners required; prepared plats and legal descriptions for fee acquisition as well as waterline and access easements Key Environmental Features • Surveys required to protect endangered Quino checkerspot butterfly • Project designed to reduce impacts on natural drainages • Traffic control plans would address impacts of construction traffic on local circulation
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