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0 <br />5.7 Noise <br />i <br />5.7.1 Environmental Setting <br />1 <br />Vehicle traffic is the primary noise source in the project <br />area. The Santa Ana Freeway (I-15), Garden Grove Freeway (Route 22), <br />and Main Street are all located within close proximity to the site. <br />Noise exposure contours for these highway segments were calculated and <br />are presented in Appendix III of this report. Figure 2B illustrates the <br />general outline of the unattenuated 65 dB contour in the project area. <br />L 65 dB or greater is typically considered excessive for certain types of <br />"noise sensitive" uses, i.e., residential. <br />Since the primary access to the site will be along Main <br />Street, "peak hour" traffic noise measurements were made at a <br />residential area which is located near Owens Drive and Main Street <br />(Refer to Figure 28). A series of noise measurements were made at <br />locations 1, 2, and 3 to establish ambient levels in this area which <br />could be impacted by increased traffic from the project along Main <br />Street. Noise samples of 12-minute periods taken at each location <br />exhibited a range of 64 dB(A) at location 1, 57 dB(A) at location 2, <br />and 52 dB(A) at location 3. Results of the noise survey also indicated <br />that any change in traffic volumes along Main Street would change noise <br />1 levels that would only be noticeable within the first 100-200 feet of <br />Main Street. This is due to the shielding effect of homes along Owens <br />Drive as one proceeds in an easterly direction away from Main Street. <br />(Refer to noise measurement data in Appendix III of this report). <br />Appendix III also contains supplemental noise measurement data <br />collected near Broadway Street located southwest of the project site. <br />CALTRANS proposes to extend Broadway Street over the Santa Ana Freeway. <br />This overpass will provide an additional link for traffic between the <br />project site and the west side of the Santa Ana Freeway. Results of <br />this noise measurement study indicated that the noise levels are in the <br />75D-263 <br />