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Enbridge Energy, LP Hoover& Keith, Inc. <br /> Waterloo Pump Station RN 3083/JN 4796 <br /> Noise Impact Analysis (10/10/14) <br /> 5.0 NOISE CONTROL REQUIREMENTS <br /> The following section provides recommended noise control measures and equipment <br /> noise specifications along with other assumptions that may affect the noise generated by <br /> the facility. <br /> 5.1 Pump House Building <br /> Building Structure <br /> > As a minimum, walls/roof should be constructed with exterior steel of 22 gauge and <br /> interior layer of 6-inch thick unfaced mineral wool (e.g., 6.0-8.0 pcf uniform density) <br /> covered with a 24 gauge perforated liner. Thermal insulation, such as "R-19", should <br /> not be used as a substitute for the 6.0-8.0 pcf material. <br /> > Personnel entry doors should have a minimum STC-38 sound rating and could <br /> include door glazing if a 2' x 2' maximum view port is employed (e.g., 1/2 inch thick <br /> laminated glazing or double pane safety glass). Doors should seal well with the <br /> doorframe and be self-closing. <br /> > No windows, skylights or"open" louvers should be installed. <br /> > All voids and openings in the building walls resulting from penetrations should be <br /> patched and well sealed. Building construction details shall be consistent with a high <br /> performance acoustical building. <br /> > Each overhead sectional roll-up door, as a minimum, should be a 20 gauge insulated <br /> type design (e.g., 20 gauge exterior with a 22 gauge backskin with insulation core) <br /> and should be completely weather-stripped. <br /> Building Ventilation <br /> > The building ventilation system should be designed to properly ventilate (and cool) the <br /> building and equipment during maximum outside ambient temperatures with all <br /> personnel and equipment doors closed. Personnel and/or equipment doors will only <br /> be opened during maintenance activities. <br /> > The A-wt. sound level for each ventilation inlet should not exceed 40 dBA at 50 feet <br /> from the building penetration (i.e., inlet louver, acoustic inlet hood, etc.). The A-wt. <br /> sound level for each ventilation exhaust outlet should not exceed 40 dBA at 50 feet <br /> from the building penetration (i.e., exhaust louver, exhaust hood, etc. A ridge vent <br /> -3- <br />