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Arden Hills 55+ Senior Housing Complex Traffic Noise Assessment <br />David Braslau Associates, Inc. Page 18 <br /> <br />The analysis of exterior-to-interior sound transmission and compliance with exceptions under the state <br />noise rules are summarized in Table 3.3 below. It can be seen that the L10 and L50 levels for the three <br />typical floor plans can be brought into compliance (i.e. 30 dBA exterior façade noise reduction) with the <br />glazing types shown in the table. The composite STC is based upon the sum of acoustical energy passing <br />through the exterior wall and a typical penalty or reduction because of the traffic spectrum is applied. <br /> <br />Table 3.3 Exterior-Interior Façade Evaluations <br /> <br /> <br /> <br />