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4. Environmental I npacts 4.1 PROJECT RELATED NOISE The proposed project has the potential to generate noise during project construction and operation which may affect sensitive receivers. Construction related noise impacts would largely be associated with noise from the use of construction equipment and construction tools. Operational phase noise impacts would be those that would occur beyond those that are currently produced. This would include noise generated by small increases in traffic volumes due to customers stopping only for the convenience store and the operation of the automated car wash, 4.1.1 Construction Noise Impacts Noise generated during construction is a function of construction equipment used, the location of the equipment, and the timing and duration of the noise-generating activities. Construction of the proposed project is anticipated to commence October 2005 with an estimated duration of 3-6 months. Construction noise levels reported in Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances, (United States Environmental Protection Agency (EPA), 1971) were used to estimate future construction noise levels for the proposed project. Typically, the estimated construction noise level is governed primarily by the highest noise producing pieces of equipment. Table 4-1 presents typical noise levels generated at varying distances from project construction sites during various construction phases and under minimum and maximum equipment usage scenarios. Table 4-1 presents noise levels for the various construction phases. The nearest noise sensitive use is the condominium complex 61 feet to the south of the project site. Table 4-1 ~ Noise Levels at Project Construction Sites (dBA Leq) Minimum Required All Applicable Construction Phase Equipment in Use1 Equipment in Use1 Reference Noise Levels (50 feet from Project Construction) Ground Clearing/Demolition 84 84 Excavation 79 89 Foundation Construction 78 78 Building Construction 76 85 Finishing and Site Cleanup 76 89 Noise Levels at Condominiums (61 feet South.from Project Construction) Ground Clearing/Demolition 82 82 Excavation 77 87 Foundation Construction 76 76 Building Construction 74 83 Finishing and Site Cleanup 74 87 1 Based on Bolt, Beranek and Newman, "Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances," prepared for the EPA, December 31, 1971. Source: The Planning Center (February 27, 2005). Construction of the proposed project would not be expected to use large quantities of construction equipment. The addition of the convenience store, car wash and walls would primarily be constructed by hand with possible use of a backhoe for building footings, Consequently, noise levels generated from project construction would be expected to generate those noise levels listed under the minimum required equipment in use, As such, noise levels may intermittently range from 74-82 dBA Leq at the nearest noise sensitive use which are the condominiums to the south of the project site, Because the Tuhnical NoiJe Study for Mobil Oil Stcltion/Car WaJh Expamion March 2005 . Page] 4 The Plcmning Center Q:I.SIIA i\J-() 1,()L\Shdmfll/lh _N"i,rRepl)r!-/;/N/lfbd(!j 31A~~ 00