55A - RESOLUTION CERTIFYING EIR SAN LORENZO SEWER LIFT STATION

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Exhibit 3 ■ ■ SAN LORENZO SEWER LIFT STATION ■F—] ENVIRONMENTAL IMPACT REPORT S.0 EXECUTIVE SUMMARY station facility, new underground sewer infrastructure, and sewer manholes and appurtenances as a replacement for the Segerstrom Lift Station would not occur. 5.5.2 MODIFIED CONSTRUCTION CONFIGURATION C.2 ALTERNATIVE As described in EIR Section 3.4, implementation of the proposed Project would result in a significant unavoidable impact at the intersection of South Bristol Street at West Segerstrom Avenue for up to five weeks during construction activities within the intersection and /or when construction activities require access to two (2) northbound lanes within South Bristol Street northerly of the intersection. In order to avoid this significant unavoidable impact, Construction Configuration C.2 would need to be altered to include timing restrictions so as to avoid traffic control measures between the hours of 7:15 a.m. to 8:00 a.m. and between the hours of 2:30 p.m. and 6:45 p.m. According to the Project's engineer, such time restrictions would limit construction activities to about 1 -2 hours per day before construction activities would need to cease in order to ensure that traffic control is removed by 2:30 p.m. Such time restrictions are considered infeasible from a practical perspective because they would dramatically elongate the construction schedule for construction activities within the intersection from up to 150 days (3-2 weeks Monday - Friday) to approximately 6049- 12050 days (based on an assumption of one to two working hours per day with traffic control, and approximately 12050 working hours needed to complete construction within the intersection). The time restrictions also would elongate the construction schedule for work within South Bristol Street, which would increase from approximately 10-5 days (2-3 weeks Monday — Friday) to 4060 -804-20 days (based on an assumption of one to two working hours per day with traffic control, and approximately 8047M working hours needed to complete the portion of construction within South Bristol Street requiring access to two northbound travel lanes). With an elongated construction schedule of up to 20045 days (40-_t5 weeks, or nearly 101 months), construction costs would be increased and construction equipment and associated activities would be a nuisance to adjacent land uses for a longer period of time. However, as shown on EIR Figure 3.4 -8, acceptable levels of service at the intersection of South Bristol Street /West Segerstrom Avenue could be maintained between the hours of 6:45 p.m. and 7:00 a.m. without elongating the construction schedule. Assuming that traffic control measures would require approximately four hours (i.e., two hours to set up and two hours for removal), this would allow for approximately 8.25 working hours per day for improvements within the intersection of South Bristol Street/West Segerstrom Avenue. Therefore, this nighttime construction alternative, identified herein as the "Modified Construction Configuration C.2 Alternative," considers modifying the construction schedule for the ..aAia.,s of construction Phases 4- 14 and 16 involving eenstruetientransitioning the existing sewer within Bristol to the new lift station within the inn eetion and viithin South Br -istal Street so as to limit the hours of traffic control and construction activities to between the hours of 6:45 p.m. and 7:00 a.m. (nighttime). Impacts to the intersection of South Bristol Street /West Segerstrom Avenue still would occur under this alternative during Construction Phase 11, as Construction Phase 11 would require implementation of Construction Configuration C.2 for a period of up to three weeks on a 24 -hour basis. Implementation of the Modified Construction Configuration C.2 Alternative would otherwise be identical to the proposed Project. The Modified Construction Configuration C.2 Alternative was selected for consideration in order to avoid reduce by two weeks the duration of the Project's significant and unavoidable short-term traffic impacts to the intersection of South Bristol Street/ West Segerstrom Avenue. S.5.3 ALTERNATIVE SITES This EIR evaluates a total of 19 alternative site locations for the proposed San Lorenzo Lift Station facility. The alternative site locations selected for consideration in this EIR include a reasonable range of potential PAGE S -7 55A -107