EXHIBIT 4-2_55A_BRISTOL WIDENING TECHNICAL STUDIES

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analyzed will be lower with than without the proposed project. Therefore, with the "build" condition, the number of days excee- ding applicable CO standards within the APEI should be reduced. Current CO concentrations without the project exceed the state 1- hour and 8-hour standards and the federal 8 -hour standards. To facilitate comparison between scenarios, Table 3 -4 shows the projected CO concentrations directly attributable to the roadway without adding background (or ambient) CO levels. The ambient CO concentrations shown in Table 3 -4 should be added to the levels generated by the traffic at the intersections analyzed to reflect the expected concentrations at various distances from the inter - 1 sections. The carbon monoxide levels at sensitive receptor locations nearest the intersections analyzed are shown in Table 3 -4. With the "build" alternative, 1 -hour. CO levels will decrease by 0.8 to 2.8 ppm. Under 8 -hour conditions, CO levels will decrease by 0.3 to 1.0 ppm. Figures 6 and 7 illustrate the four intersections analyzed, the closest residential lots, and the closest sensitive receptor location. As shown therein, the closest residential land uses to the intersection of Bristol Street and Memory Lane are three single family dwellings(SFD) and a;multifamily apartment complex. The first SFD lies 2fl0 feet east.ok the Bristol Street centerline and the second SFD lies 175 feet west of the Bristol. Street centerline. Both residences -lie adjacent to the Memory Lane right -of -way. The third SVD lies 175 feet south of the Memory Lane centerline, adjacent to the Bristol right --of -way. A multi - family attached complex lies on the northwest corner of this intersection with the closest receptor located 200 feet north of the Memory Lane centerline and 225 feet west of the Bristol .Street centerline. The closest residential receptor to the intersection of Bristol at Seventeenth Street is an SFD which lies 650 feet north of the Seventeenth Street centerline and 20 feet east of the Bristol right -of -way. Rangho Santiago Community College is considered a sensitive recepto't and lies on the southwest corner of this intersection. A computer center in Building "A" lies 100 feet south of the Seventeenth Street centerline and 350 feet west of the Bristol Street centerline. The music building lies 100 feet west of the Bristol; Street centerline and 300 feet south of the Seventeenth Street centerline. The land uses surrounding the intersection of First at Bristol Street are generally commercial. However, a multifamily attached four -plex at 114, 116, 116, and 120 Bristol Street lies at the right -of -way. The nearest unit to the intersection lies 150 feet north of the First Street centerline. West of and adjacent to this lot lies the Johnson Chapel AME Church, 100 feet west of the 3 -11