EXHIBIT 4-2_55A_BRISTOL WIDENING TECHNICAL STUDIES

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front residential units and 39 feet west of the Bristol Street right -of -way. A chain link fence, gated for pedestrian access, exists at the right -of -way. This noise measurement is represen- tative of the noise level at 33 residences on Bristol Street between Santa Clara Avenue and Seventeenth Street. Measurement site 4 was taken on the Rancho Santiago Community College Campus adjacent to the auditorium. The site was 70 feet from the Bristol right -of -way. A three foot block wall at the right -of -way provides some noise attenuation but allows complete line of sight exposure to truck exhaust stacks. This block wall is also broken directly in front of the measurement site to allow for pedestrian access. The noise level measured at this site also reflects volumes on Seventeenth Street adjacent to this intersection. Measurement site 5 was taken in the front yard of a midblock SFD at 5 feet from the Bristol Street right -of -way. This front yard area has full exposure to the roadway. The noise level at this residence is expected to be representative of noise levels at 16 similar residences along Bristol Street in the project vicinity. Measurement site 6 was selected at an SFD that is a "worst case" receptor in this area. The site lies 3 feet from the Bristol Street right -of -way at a point 80 feet south of Seventh Street. The measurement was taken adjacent to the front porch. This outdoor activity area has full exposure to Bristol Street. Measurement site 7 was taken adjacent to a 4 -unit multifamily attached dwelling at 114 Bristol Street. The residence lies at the right -of -way and an outdoor activity area is only possible in the side yard area. This area receives full street exposure from Bristol and First Street since it is separated from First Street by a vacant lot. The site was located 60 feet from the First Street right -of -way. The intersection has a phased signal and traffic queues in front of this residence. i Measurement site 8 was selected in the front yard of a single family dwelling on the southeast corner of Bristol Street at Raymar Avenue. The measurement was taken 11 feet from the Bristol Street right -of -way adjacent to a front porch. This residence is similar to eleven other houses in the project vici- nity. i Measurement site 9 was taken in the rear yard of a corner house at Richland Avenue and Bristol Street. The site was located at an outdoor activity area on the patio in the rear yard which lies adjacent to Bristol Street. The site was 30 feet from the Bristol Street right --of -way and 5 feet from the rear entrance. The rear yard is separated from the roadway by a 5 -foot high block wall. This noise level measurement was assumed to be repre- sentative of sound levels in the vicinity that are currently attenuated by a 5 -foot block wall. 4 -9