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Table 3.6-2 <br /> Department of Housing and Urban Development (HUD) <br /> Exterior Noise Exposure Standards for New Construction Sites <br /> Day-Night <br /> Category Sound Level-Ldn <br /> Unacceptable greater than 75 dB <br /> Discretionary--normally unacceptable greater than 65 dB, <br /> but less than 75 dB <br /> Acceptable less than 65 dB <br /> Source: HUD, 1979. <br /> 83 <br />