EXHIBIT 4-2_55A_BRISTOL WIDENING TECHNICAL STUDIES

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ces. Sites 1 through 12 lie adjacent to Bristol Street, whereas site 13 is one lot removed and therefore a second line receptor. All measurements were located with respect to the existing right- - of -way. Single family residences at sites 1, 5, and 6 have front yards facing with direct driveway access onto Bristol Street. Both multifamily residential sites (3 &7) and single family sites 6, 9, 12, & 13 take access from side streets and have front yards facing away from Bristol Street. Traffic on Bristol Street was free flowing during all measure - ments with the exception of sites adjacent to major intersections where vehicle delay was significant. Measurement 7 is considera- bly affected by this situation due to its proximity to the inter- section and location adjacent to the southbound approach lane. Also note that noise levels midblock are significantly greater than levels closer to the intersections since higher travel speeds are prevalent and noise generated from vehicles is highly speed dependent. Figure 3 depicts the existing land uses adjacent to Bristol Street. Table 4--4 provides the ambient noise measurements at each site in decibels on the A- weighted scale, using the Leq noise descriptor. It also includes comments on the type of adjacent land use. Ten minute noise level recordings were used to represent the maximum noise level for a typical weekday evening peak hour period. Traffic counts were made during the noise measurements and the maximum Leq values shown in Table 4-4 include adjustments to reflect the peak hour traffic conditions. Measurement site 1 was located in the front yard of a single family residence. This residence lies midblock on Bristol Street, 200 feet north of Santa Clara Avenue and is affected by changes in noise level due to the signal at this intersection. The measurement was taken 15 feet from the Bristol Street right - of -way and 5 feet from the front entryway of the house. This residence is representative of 10 other houses in the vicinity. Measurement site 2 was located in the playground area of the Santiago Elementary School. The playground lies adjacent to Bristol Street and has full street exposure. There is an exis- ting chain link fence separating the school grounds from the roadway. This fence provides no noise attenuation and is broken at two ends of the property for pedestrian access. The closest classroom to Bristol Street lies 275 feet from the Bristol Street right --of -way. Measurement site 3 was selected at a multifamily detached dwel- ling complex in a common recreational area. The site was adja- cent to a gazebo in an outdoor activity area, between two of the 4 -7