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Table 4.6-3 Processing Area Noise Sources and Predicted Noise Levels Alternative 3 Reference Level Receiving Distance Predicted Lam/Leq Source at 100 feet-L@ , Location from Source q at Receiver° i �i , (feet)' i, Processing 75 dB Nearest P/L 300 65 -Equipment Residence 1 3,500 44 Residence 2 1,000 55 Asphalt Plant 80 dB Nearest PIL 300 70 Residence 1 3,500 49 Residence 2 1,000 60 Sales/Load-Out 65 dB ' Nearest PIL 300 ' 55 Residence 1 3,500 34 Residence 2 1,000 45 j + 1 - Reference levels obtained from noise level measurements of similar equipment conducted in 4 recent years and FHWA traffic noise prediction model. 2- Residential receiver location are identified on Figure 4.6-1. I� 3- Approximate distance in feet from effective center of noise source area to receiving location. 4- Levels predicted at the receiver are based on a noise level reduction of 6 dB per doubling of distance from the source and do not include corrections for atmospheric absorption of sound and ' shielding by intervening topography and orchards. PIL = property line i! I� ` Table 4.6-3 data indicate that the noise emissions of the various components of the I Alternative 3 plant area are not predicted to exceed the noise standards of the San Joaquin County Noise Ordinance. In addition, after consideration of the noise attenuation provided i by intervening orchards and topography, these noise emissions are not expected to I significantly exceed existing ambient noise levels at Residence #1. However, project- related noise levels are expected to significantly exceed existing ambient noise levels at ' Residence #2, located immediately southwest of the project site. I I After consideration of the noise reduction provided by the embankment of the California Aqueduct, plant area noise levels are expected to be between 55 and 60 dB L at e k Residence #2. Existing ambient noise levels at that residential location were measured to be approximately 50 dB during daytime hours. An increase in noise levels of 5 dB or more i is considered to constitute a significant noise impact. Therefore, plant area noise i generation associated with Alternative 3 is expected to result in a significant noise impact at Residence #2. y Mitigation Measure 4.6-1a (Alternative 3) .I The proponent shall locate the effective noise center of the plant area to a position at least 3,000 feet from Residence #2. This measure would provide a sufficient it Draft.Environmental Impact Report 4-91 ER-96-3 �I I �l