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Table 4: Common Sound Levels Noise Source Geothermal normal operation Near leaves rustling from breeze Whisper at 6 feet Inside average suburban residence Near a refrigerator Geothermal construction Geothermal well drilling Inside average office, without nearby telephone ringing Speech at 3 feet, normal voice level Auto (60 miles per hour) at 100 feet Vacuum cleaner at 10 feet Garbage disposal at 3 feet Electric lawn mower at 3 feet Food blender at 3 feet Auto horn at 10 feet Sound Level (dBA) 15 - 28 25 35 40 40 51 - 54 54 55 60 65 70 80 85 90 100 In addition to BLM federal regulation, local city and county noise ordinances will vary from site to site. However, geothermal power plants can operate in compliance with the applicable regulations and are not considered a noise nuisance in surrounding residential communities. All power facilities must meet local noise ordinances according to the phase of construction and operation. Noise pollution from geothermal plants is typically considered during three phases: the well-drilling and testing phase, the construction phase, and the plant operation phase. During the construction phase, noise may be generated from construction of the well pads, transmission towers, and power plant. During the operation phase, the majority of noise is generated from the cooling tower, the transformer, and the turbine-generator building. Construction is one of the noisiest phases of geothermal development, but even construction noise generally remains below the 65 dBA regulation established by the BLM. For example, according to the EIS completed for the proposed Telephone Flat geothermal development, construction noise was estimated to be 51 dBA at a 1⁄2 mile distance. The EIS further found that even if two well pads were constructed simultaneously, noise levels would not rise above 54 dBA, well below the 65 dBA BLM regulations. Furthermore, noise pollution associated with the construction phase of geothermal development, as with most construction, is a temporary impact that ends when construction ends. Well pad construction can take anywhere from a few weeks or months to a few years, depending upon the depth of the well. In addition, construction 42PDF Image | Guide to Geothermal Energy and the Environment Geothermal plants
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