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047 and associated improvements to the ramps. These newly constructed improvements to the Santa Ana Freeway have created an improved traffic flow along the Santa Ana Freeway, and between the Santa Ana Freeway and the Garden Grove Freeway, especially in peak traffic periods. There are 23 key arterial intersections surrounding MainPlace as listed on Exhibit B attached hereto. Based upon a study using the standard Intersection Capacity Utilization methodology for intersection analysis, all of these intersections are presently at acceptable levels of service (LOS D or better) during the AM peak hour traffic periods, and all but two are at acceptable levels of service during the PM peak hour traffic periods. When other approved development projects which have not yet been built in the surrounding area to MainPlace are added to the analysis, two more of these intersections will fall below the acceptable level of service D. Therefore, a total of 19 intersections are expected to be at or above the acceptable level of service D based on the existing traffic conditions today plus the additions of the expected traffic from all of the other previously approved projects in the surrounding area. The other 4 intersections are expected to be below the acceptable level of service D. The proposed expahsion project is expected to generate an additional approximately 1,235 trips during the PM peak hour traffic period. The Planning Commission finds that when these additiona! trips from the proposed expansion are included with the existing traffic conditions today plus the additional expected traffic from all of the other previously approved projects in the surrounding area, the same 19 intersections will remain operating at or above the acceptable level of service ]3, and 4 other intersections will remain below the acceptable level of service D. Thus, the Planning Commission finds that the proposed expansion will not create any new or additional adverse effects on traffic, and will not result in any additional significant impacts compared to those identified in the traffic study conducted as part of the certified EIR. 7. Noise. The primary source of noise from MainPlace is vehicle traffic. The certified EIR analyzed sound levels at three different residential areas near MainPlace during PM peak hour traffic periods. The results demonstrated that the average 12-minute sound levels at the three locations were 64 dBa, 57 dBa and 52 dBa. There is approximately a 2 to 1 ratio between the amount of development presently at MainPlace compared to the development which existed on the Property at the time the EIR was certified. This translates to approximately an additional 3 dB increase in traffic related noise for the immediate area surrounding MainPlace. The additions of 3 dB to the reported dBa levels of the three locations studied in the EIR would result in the aggregate for each location remaining below the acceptable Community Noise Equivalent Level (CNEL) and Day-Night Noise Level (DNL). The Planning Commission finds that, based upon these guidelines, the existing sound levels in the irmnediate area of MainPlace are consistent with the land uses in the area.