annexc - Newmont Mining Corporation

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Annex C6 -- Noise Supplemental Information C6 - 2 For general comparison purposes, Table C6-1 lists typical A-weighted sound levels of common noise sources and activities. The noise levels in the table listed for specific sources (e.g., a motorcycle accelerating) at referenced distances represent the approximate maximum levels during that event. Such maximum levels typically occur nearly instantaneously, and generally are not sustained continuously over a prolonged period of time. Similarly, the noise levels listed for general sources or environments (e.g., inside a computer equipment room) represent more sustained levels for the general conditions listed. Noise Level (dBA) 120 110 100 90 80 70 60 50 40 30 20 10 TABLE C6-1 Common Noise Levels, Sources and Subjective Human Evaluation Noise Source • Jet take-off at 100 feet • Hard rock concert • Motorcycle accelerating a few feet away • Automobile horn 10 feet away • Gas lawnmower 3 feet away • Diesel truck driving by 50 feet away • Inside a computer equipment room • Very loud speech - 3 feet away • Crackling plastic food wrapper 2 feet away • Car driving by at 55 mph 50 feet away • Outdoors in a commercial area • Normal speech 3 feet away • Typical office activities • Background noise in a conference room • Library background noise • Quiet suburban environment at night • Typical background noise in a residence • Whisper 3 feet away • Typical broadcast studio • Concert hall background noise • Human breathing 0 • Threshold of hearing or audibility Source: Egan (1988); Cavanaugh and Tocci (1998); Burge (2002). NOISE MEASUREMENT METHODOLOGY Subjective Human Evaluation Deafening Very Loud Loud Moderate Faint Very Faint The long-term noise measurements were conducted using two Larson Davis Model 820 sound level meters, which comply with the Type 1 tolerance requirements of the American National Standards Institute (ANSI). Both meters were field calibrated before and after each measurement, and each meter had been calibrated at an accredited laboratory within the past 12 months. Measurements were conducted using the “fast” time averaging function. Overall levels were measured using the A-weighting scale. The microphones of the meters were fitted with appropriate wind screens and set approximately 1.5 meters above the ground (at a typical listening height). Akyem Gold Mining EIS November 2008 FINAL EIS
Annex C6 -- Noise Supplemental Information C6 - 3 The sound level meters were set to continuously measure the hourly Leq, L90, and other parameters. The long-term measurements were unattended most of the time but were visited several times during the week, both during the day and at night. Area noise sources were noted during the setup and retrieval of the meters and during these visits, and some general observations regarding the existing noise environment follow. NOISE MEASUREMENT RESULTS AND DISCUSSION Mamanso (M1) – Measurements were conducted at the Newmont Community Centre. This location is representative of the main part of town where most of the residents live. There are some residents closer to the proposed mine, but they are also closer to the main north-south road. The Community Centre is located about one hundred meters off the main road where baseline sound levels are lower and more representative of the village as a whole. The measured sound levels differ greatly between the May and October surveys. During the May survey, the L90S ranged from approximately 40 to 60 dBA during both the day and the night. During the October survey the L90S ranged from approximately 40 to 83 dBA during the day and 44 to 68 dBA at night. The levels during the October survey are noticeably louder than during the May survey, and the reasons for this are not completely understood. Weather data were analyzed and no pattern was seen with any of the measured parameters, such as wind and rain that correlated to the periods of high sound levels. One possible explanation is that the high sound levels were due to crickets, because the sound levels spike at sundown (between 6 and 7 p.m.), which is when temperatures drop and crickets come out. This phenomenon is much more apparent in the October survey during the wet season. This is supported by the fact that crickets were consistently noted as the primary audible source during the attended measurements. New Abirem South (M2) - Measurements were conducted at one of Newmont’s residences located in the southwest area of New Abirem. This location is representative of the residences in New Abirem located closest to the proposed mine and away from the main north-south road. The measured sound levels differ somewhat between the May and October surveys. During the May survey, L90S ranged from approximately 30 to 52 dBA during the day and night. During the October survey, the L90S ranged from approximately 30 to 69 dBA during the day and 41 to 62 dBA at night. During the daytime, the levels during the October survey were as much as 17 dBA louder than the May survey, while at night the levels were approximately 10 dBA louder. Again, the reasons for this are not completely understood, but crickets are suspected. New Abirem North (M3) - Measurements were conducted at one of Newmont’s residences located in the northwest area of New Abirem. This location is representative of the residences in New Abirem located closest to the proposed mine and away from the main north-south road. Akyem Gold Mining EIS November 2008 FINAL EIS
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A N N E X C SUPLEMENTAL INFORMATION
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Annex C1 - Flora and Fauna Species
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ANNEX C-2 AQUATIC RESOURCES SUPPLEM
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Annex C2 - Aquatic Resources Supple
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Annex C2 - Aquatic Resources Supple
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Annex C3 - Geology and Geochemistry
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Drill Hole ID Core Interval (meters
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TABLE C3-5 (continued) Lithology Ke
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TABLE C3-7 Results of Synthetic Pre
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TABLE C3-7 (continued) Results of S
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TABLE C3-8 Results of Biological Ac
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TABLE C3-8 (continued) Results of B
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TABLE C3-9 (continued) Results of P
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TABLE C3-9 (continued) Results of P
Page 57 and 58: Annex C4 - Water Resources Suppleme
Page 59 and 60: Flow (m3/sec) 80 70 60 50 40 30 20
Page 63 and 64: Flow (m3/sec) 80 70 60 50 40 30 20
Page 67 and 68: Surface Water Statistic Afosu Strea
Page 73 and 74: Piper Diagram for Pra River and Tri
Page 75 and 76: Seep Water Statistic All Seep Sampl
Page 83 and 84: Groundwater Elevation (meters re ms
Page 85 and 86: Groundwater Elevation (meters re ms
Page 89 and 90: Table C4-7 Groundwater Chemistry (2
Page 91 and 92: Surface Water Statistic Village Wel
Page 93 and 94: Surface Water Statistic Village Wel
Page 95 and 96: Groundwater Type Statistic Village
Page 97 and 98: Piper Diagram for Village Wells Aky
Page 99 and 100: Annex C5 - Soil Resources Supplemen
Page 101 and 102: Series BEKWAI NZIMA KOKOFU ODA TEMA
Page 107: Annex C6 -- Noise Supplemental Info
Page 111 and 112: ANNEX C-7 SOCIOECONOMICS SUPPLEMENT
Page 113 and 114: Annex C7 -- Socioeconomics Suppleme
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annexc - Newmont Mining Corporation

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