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<br /> <br /> <br />Memorandum <br />February 26, 2025 <br />Page 9 <br />21202-23 North County Landfill_Noise DRAFT <br />ANALYSIS AND FINDINGS <br />Operation Noise <br />The project would not involve construction of new facilities at the North County Landfill. The <br />primary source of noise during project operation would be due to a net increase in off-road <br />equipment on the project site and project-generated vehicle trips along the haul route. The <br />project would increase the maximum amount of allowed daily refuse disposal and the number <br />of daily incoming refuse trucks from 1,200 tons per day and 850 trucks per day to 4,000 tons <br />and 1,200 trucks per day. This increase would involve a change in refuse truck routing; <br />approximately 51 transfer trucks that currently go to the Foothill Landfill would be re-routed to <br />the North County Landfill. The increase in daily refuse disposal would also increase the use of <br />off-road equipment associated with landfill operations. According to the Transportation Impact <br />Analysis prepared for the project,7 the project will generate an average of 461 new trips per <br />day, including 359 visitor and worker commute trips and 102 haul truck trips. <br />Landfill Off-Road Equipment Noise <br />The heavy off-road equipment currently used at the North County Landfill will continue to be <br />used with implementation of the project. Compared to the current operation condition, the <br />project would increase the hours of operation and increase the number of off-road equipment <br />used on site (one compactor, one scraper, two dozers, and one loader), but would not change <br />the type of equipment used or the manner of operation. It was assumed that heavy off-road <br />equipment will primarily be used at the designated waste disposal areas. <br />Noise levels from landfill off-road equipment usage were calculated using a conservative <br />outdoor noise propagation methodology that did not consider sound attenuation from <br />intervening buildings or terrain. The nearest noise sensitive receptor to the project site is a <br />single-family home located approximately 2,100 feet northeast from the top of Lined Area 1 <br />(Figure 1). Two scenarios were modeled to evaluate the potential noise impacts from off-road <br />equipment operations at the project site: <br />1) Maximum Noise Level Scenario <br />2) Typical Noise Level Scenario <br />Under the Maximum Noise Level Scenario, it was conservatively assumed that all of the off- <br />road equipment for the project (existing and proposed) would operate simultaneously near the <br />top perimeter of Lined Area 1 for up to 30 minutes. It should be noted that this is a very <br />conservative analysis because it is highly unlikely that all of the off-road equipment would be <br />used simultaneously in this manner, and the existing cells within Lined Area 1 have been filled <br /> <br />7 W-Trans, 2025. DRAFT Transportation Impact Analysis for the North County Recycling Center and Sanitary Landfill <br />Project. January 23.