7- AA19-04; TPM19-01;DA18-02_2800 N MAIN STREET

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5.7 Noise 5.7.1 Environmental Setting Vehicle traffic is the primary noise source in the project area. The Santa Ana Freeway (1-15), Garden Grove Freeway (Route 22), and Main Street are all located within close proximity to the site. Noise exposure contours for these highway segments were calculated and are presented in Appendix III of this report. Figure 28 illustrates the general outline of the unattenuated 65 dB contour in the project area. LU 65 dB or greater is typically considered excessive for certain types of "noise sensitive" uses, i.e., residential. LI--; Since the primary access to the site will be along Main Street, "peak hour" traffic noise measurements were made at a residential area which is located near Owens Drive and Main Street (Refer to Figure 28). A series of noise measurements were made at locations 1, 2, and 3 to establish ambient levels in this area which could be impacted by increased traffic from the project along Main Street. Noise samples of 12-minute periods taken at each location exhibited a range of 64 dB(A) at location 1, 57 dB(A) at location 2, and 52 dB(A) at location 3. Results of the noise survey also indicated that any change in traffic volumes along Main Street would change noise levels that would only be noticeable within the first 100-200 feet of Main Street. This is due to the shielding effect of homes along Owens Drive as one proceeds in an easterly direction away from Main Street. (Refer to noise measurement data in Appendix III of this report). Appendix III also contains supplemental noise measurement data collected near Broadway Street located southwest of the project site. CALTRANS proposes to extend Broadway Street over the Santa Ana Freeway. This overpass will provide an additional link for traffic between the project site and the west side of the Santa Ana Freeway. Results of this noise measurement study indicated that the noise levels are in the 119