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1 . Introduction <br /> GEI Consultants, Inc. (GEI) has prepared this report to summarize the investigations, <br /> analyses, and designs for the Overland Ponds and Treiber Reservoirs Interconnects. The <br /> Overland Ponds and Treiber Reservoirs system is not considered a jurisdictional facility by <br /> the Colorado State Engineer's Office. The designs described in this report are based on <br /> current best-practice, engineering judgment, and discussions with and preferences of the <br /> owner/operator of the ponds. <br /> 1.1 Background <br /> The Overland Ponds and Treiber Reservoirs site is located in Fort Collins, Colorado, <br /> northwest of the existing Martin Marietta Materials (MMM) Home Office mine (Figure 1).- <br /> The site was formerly a part of the Home Office gravel mine and is about 37 acres in area. <br /> Ownership of the property is divided between private ownership, MMM, the City of <br /> Greeley (City) and three water districts: the Fort Collins-Loveland Water District, North <br /> Weld County Water District, and East Larimer County Water District. The three water <br /> districts are known collectively as the Tri-Districts. <br /> The project site consists of a series of below-grade active, reclaimed, or partially reclaimed <br /> gravel pits separated by unmined highwalls, which function as utility corridors and public <br /> lands. The site, shown in Figure 2, has thirteen gravel pits in all. Four abandoned gravel pits <br /> (Overland Ponds Pond 1 and 2, Treiber A, and Treiber B) are owned by the Tri-Districts, <br /> three abandoned gravel pits (Lamb A, Lamb B, and Lamb C) are owned by the City. The <br /> remaining gravel pits (Overland Ponds 3-5 and Currie A-C) are privately owned or owned by <br /> MMM. Overland Ponds 1-5 are being actively reclaimed or mined by MMM. At the <br /> conclusion of mining activities, the Tri-Districts may procure the remaining gravel pits and <br /> utilize them for as augmentation reservoirs. The goal of the City and the Tri-Districts is to <br /> own, reclaim, and operate all 13 ponds as an interconnected system. <br /> The goal of this project is to design and construct an interconnected system between <br /> Overland Ponds 1, 2, and 3, Treiber A, and Treiber B. The purpose of connecting these <br /> ponds is to establish a hydraulic connection between them. When connected, inflow from <br /> ditch or river water can be conveyed between the ponds, and the ponds can be used to store <br /> raw water. The anticipated method of installing the interconnect piping is by trenchless <br /> construction using an open faced tunnel boring machine and pipe jacking methods. <br /> A reclamation plan is begin implemented to separate the existing groundwater lakes from the <br /> alluvial groundwater system and create water storage reservoirs in accordance with the <br /> Division of Reclamation, Mining and Safety(DRMS) permit application M-2011-049, <br /> submitted September 19, 2011. First phases of the reclamation plan included lining Overland <br /> GEI M <br /> Introduction 1 1 <br />