EXHIBIT 4-1_55A_BRISTOL WIDENING EIS-EIR

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Measurement Site 1 was located in the front yard of a single - family residence. The residence lies mid -block 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 riszht -of -wavy 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 existing 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 multi - family detached (NiFD) dwelling complex in a common recreational area. The site was adjacent _. to a gazebo in an outdoo*r activity area, between two of the 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 representative 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 tp 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 R 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 mid -block single- family dwelling (SFD) at five 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 b was selected at an SFD that is a "worst case" receptor in this area. The site lies three 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 four -unit, multi- family attached (MFA) dwelling at 114 Bristol Street. The residence lies at .. III -22