ARCHIVED REPORTS_1991_1 - Laserfiche WebLink

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The model did not take local shielding into account so noise attenuation that might be brought about by terrain, solid fences, buildings, etc. was not subtracted from predicted figures. Comparing the 60 dBA maximum CNEL level allowed for mobile home parks (Figure N-1) with results from the model leads to the conclusion that shielding would be necessary to bring noise along the west edge of the mobile home park into compliance. Noise was measured on the site of the transfer station on October 4, 1989. The equipment used to measure noise was a Quest 215, Type 2, meter. It was mounted on a tripod 5' above the ground. Various noise sources in the operation were recorded with the meter by means of histograms. Table N-1 is a list of findings about noise from each of the processes taking place on site. Method No predictions were made in past studies for noise at street intersections in Lodi's Northeast industrial zone. This document will develop noise predictions due to increased traffic using the FWHA model. First, however, it will estimate the impacts associated with expanding transfer station operations from 400 tons per day (TPD) to 2000 TPD. The map on the following page (Figure N-3) indicates the proposed location of the processes whose noise profile was recorded on Table N-1. Figure N-3A shows the proposed transfer station layout. Noise levels in area A may increase by 2 Db due to the difference in the proposed site layout (Figure N-3A) as opposed to Figure N-3 from which the noise profile was established. To evaluate the effect of expanding the transfer station many of the activities that take place on it will be assumed to have increased to approximately 5 times present levels. Each of the functions will be analyzed individually in the paragraphs that follow. Subsequently, the noise of the functions will be combined to produce a composite noise picture of the expanded operation. 1) Truck Parking and Storage At present about 40 trucks are parked on the site over night. They are driven into the parking area and backed into their stalls to be ready for early morning (6:00 - 7:00 am) start up and departure. In the future 200 trucks would be parked on the site (See Figure N-4). When they back into their parking stalls in the afternoon a warning horn producing 80 dBA (at 50) will be heard. When they start up in the morning the trucks will each idle for a minimum period of 5 minutes to allow for engine warmup. At 50' truck engine noise and exhaust will produce a combined level of 80.5 dBA at 250 Hertz (Hz). On the assumption that the whole process of backing trucks into 30