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<br />INTRODUCTION <br />The City of Lafayette (City) owns and operates a property known as the Goose <br />Haven Reservoir Complex that is located northwest of the intersection of U.S. <br />Highway 287 and Isabelle Road in Lafayette, Colorado in parts of Sections 15, 21, and <br />22, Township 1 North, Range 69 West of the 6th P.M., County of Boulder, State of <br />Colorado. The complex contains two raw water storage reservoirs completed in the <br />late 1980s. The existing reservoirs are named Goose Haven Reservoir No. 1 and <br />Goose Haven Reservoir No. 3. The City plans to expand the Goose Haven Reservoir <br />Complex by building a third reservoir, Goose Haven Reservoir No. 2. It is understood <br />the new reservoir will be connected to one or both of the existing reservoirs to move <br />water between the reservoirs. <br />CTL Thompson, Inc. (CTL T) first consulted with the City and its engineers <br />on expanding the City's raw water storage in 2002. CTL T has completed several <br />geotechnical engineering consulting assignments for the additional raw water storage <br />since 2002. These assignments are designated CTL I T Project Nos. FC02511, <br />• FC02740, FC03360.000-125, FC03362.000-145, FC03371.000-125, and FC04797.000-145. <br />CTL T completed these assignments to assist the City and its engineers with the <br />geologic and geotechnical consultation they needed to select a location and formulate <br />a preliminary configuration for a new City raw water storage reservoir. The location <br />selected was in the Goose Haven Reservoir Complex described above. <br />The ground water response to the reservoir complex expansion is the subject <br />of this report. Data from previous studies by others and from the previous CTL T <br />studies at the complex were combined with data collected for this study to write this <br />report. <br />RESERVOIR EFFECT ON GROUND WATER <br />This study shows no effect on the ground water further south of the complex <br />than about 800 feet. The estimated rise in the groundwater elevation below the Swartz <br />Residence located about 300 feet south of the reservoir complex is about 8 feet above <br />the groundwater conditions prevailing at the time of the field work for this study as <br />• shown on Figure 5. This rise in groundwater elevation would result in a decrease in <br />McLAUGHLIN WATER ENGINEERS, LTD. 1 <br />GOOSE HAVEN RESERVOIR COMPLEX EXPANSION <br />CTL I T PROJECT NO. FC04797.002-145