75D - PH- MAIN PLACE TRANSFORMATION

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■ Improvements along La Veta Avenue, including the intersection of Main Street at La Veta Avenue and La Veta Avenue at Pepper Street. These improvements in combination with the mitigation measures originally identified for the Fashion Square EIR, which have already been implemented, will provide adequate roadway capacity to accommodate estimated traffic to be generated by the proposed expansion. The proposed expansion modifications are not estimated to result in any additional significant impacts compared to those identified in the Traffic Study for Fashion Square EIR. The measures identified to mitigate the anticipated impacts of the Fashion Square Commercial Center served to mitigate a much larger project than the proposed expansion and that which exists as MainPlace. The measures are more than adequate to mitigate the estimated impacts of the proposed MainPlace expansion. Noise Environmental Setting As discussed in the Fashion Square EIR, vehicle traffic is the primary source of noise in the project area. Major roadways previously described in that EIR continue to be the primary sources of traffic noise in the area. The extension of Broadway Street over the Santa Ana freeway which provides an additional link for traffic between the project site and the west side of the Santa Alfa freeway has been completed. A noise barrier along the west side of Broadway Street between the freeway and Santa Clara Avenue has been completed. The Fashion Square EIR reports the results of sound level measurements that were taken in the residential area which is located near Memory Lane (formerly Owens Drive) and Main Street. Measurements were taken during the peak afternoon traffic period at the three locations depicted in Figure 28 of the Fashion Square EIR. 12-minute average sound levels were 64 dBA, 57 dBA, and 52 dBA respectively at Positions 1, 2, and 3. Sound levels reported in the Fashion Square EIR have likely increased in the time since those measurements were taken. Noise from traffic is proportional to the volume of traffic. A rule of thumb is that a doubling of the traffic volume is needed to increase traffic noise by 3 dB, and a tripling of traffic volume would be needed for a 5 dB increase in noise, generally considered to be the threshold of a distinctly perceptible increase in noise. Since the time the Fashion Square EIR was prepared, the amount of retail space at the center has increased from approximately 522,000 square feet to 1,100,000 square feet or a factor of about 2:1. This corresponds to about a 3 dB increase in traffic noise for the immediate area and access to MainPlace parking. Accordingly, existing peak period sound levels are estimated to be 67 dBA, 60 dBA, and 55 dBA respectively at the three positions where measurements were previously taken. A 3 dB increase in traffic noise implies that the contours depicted in Figure 28 in the EIR would expand to a distance of about 1.5 times the distances to the associated roadways shown in Figure 28. Addendum E1Rfor Matn Place/Santa Ana (F.R96-033) M Project 1996 Page 16 ect No. 96-066 75D-407