Laserfiche WebLink
Enbridge Energy, LP Hoover & Keith, Inc. <br /> Waterloo Pump Station —Noise Impact Analysis RN 3083/JN 4796 <br /> APPENDIX C—Acoustical Terminology (10/10/14) <br /> (10) Sound Level Meter(SLM):An instrument used to measure sound pressure level, sound level, <br /> octave-band SPL, or peak sound pressure level, separately or in any combinations thereof. The <br /> measured weighted SPL(i.e.,A-Wt. Sound Level or dBA) is obtained by the use of a SLM having <br /> a standard frequency-filter for attenuating part of the sound spectrum. <br /> (11) Sound Power Level (Lw or PWL): Ten times the common logarithm of the ratio of the total acoustic <br /> power radiated by a sound source to a reference power. A reference power of a picowatt or 10-12 <br /> watt is conventionally used. <br /> (12) Tone:A tone is a sound sensation-having pitch, which is a listener's perception of the frequency <br /> (for example,the higher the frequency, the higher the pitch). For a measured sound spectrum, a <br /> tone is represented as a"peak" in the spectrum curve. Noise that contains significant tones is <br /> considered a tonal type of noise. <br /> (13) List of Common Environmental (i.e., Man-Made&Natural) Noise Sources: For reference, the <br /> following Table presents a list of some common environmental (i.e., man-made and natural) noise <br /> sources as compared to the estimated sound level of the pumping station at the closest NSAs. <br /> Note that inside a typical house, the noise level of an outdoor noise source is approximately 15 to <br /> 20 dB quieter(i.e., house typically provides at least 15 to 20 dB noise reduction). <br /> Type of Noise Source Approx.A-Wt. Approximate Distance <br /> Sound Level To Noise Source <br /> Lawn mower(outdoor) 50—55 dBA 150 to 200 feet <br /> Passenger cars @ 50—60 mph(outdoor) 50—55 dBA 250 to 300 feet <br /> Residential AC unit(outdoor) 50—60 dBA 40 to 50 feet <br /> Residential AC unit(outdoor) 35—45 dBA 200 to 250 feet <br /> Chemical plant(outdoor) 40—50 dBA '/2 mile from plant <br /> Cicadas(outdoor,summertime @ night) 50—55 dBA General area of insects <br /> Window AC unit(indoor) 50—60 dBA 5 to 20 feet <br /> TV @ normal listening level(indoor) 60—70 dBA 10 to 15 feet <br /> Vacuum cleaner(indoor) 70—75 dBA 10 to 15 feet <br /> List of Some Common Environmental Noise Sources compared to Station Sound Level at Closest NSAs <br /> C-3 <br />