55A - RESOLUTION CERTIFYING EIR SAN LORENZO SEWER LIFT STATION

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Chapter 3 Findings Regarding Project Alternatives Attachment "A" for a total duration of three weeks, rather than the five weeks associated with the proposed Project. In addition, this alternative would not require implementation of Construction Configurations B.1, B.2, or C.I. However, this alternative would require the installation of new sewer facilities beneath the existing paved right -of -way of South Bristol Street that are not proposed as part of the proposed Project (i.e., to the south of the South Bristol Street/West Segerstrom Avenue intersection). The segment of South Bristol Street between this site and the existing lift station facility contains a 20- inch OCSD trunk sewer, a 36 -inch MWD pipeline, a 16 -inch water main, and a SCE /MCI Duct Bank. These utilities would require special support during construction of the new 18 -inch sewer, as the new sewer line would need to be installed at a depth of approximately 16 feet, and this depth would increase with distance from the existing facility. Construction along this segment of South Bristol Street would require supporting the utilities from the top of the trench and /or the use of trench boxes /shields, which would elongate the construction schedule. Due to these existing utility constraints beneath South Bristol Street, portions of this roadway would need to be closed to accommodate construction associated with this alternative, which has the potential to result in adverse effects to vehicular circulation. Moreover, the duration of construction for this alternative site location would greatly increase due to the need to cross the railroad tracks running parallel and north of Alton Avenue. Implementation of this alternative would otherwise be similar to the proposed Project during construction conditions. Development of a lift station at Alternative Site No. 19 would require the City to acquire private property to accommodate the proposed lift station. In addition, this alternative would require the City to acquire a temporary construction easement to facilitate construction of the proposed lift station. 3.4.21.2 Summary Comparison of Environmental Effects The environmental effects of constructing the proposed lift station at Alternative Site No. 19 in comparison to the proposed Project site are shown in Final EIR Table 5 -1 and described in detail in RDEIR Section 5.4.21. This alternative would reduce the proposed Project's significant and unavoidable impact associated with Construction Configuration C.2 by two (2) weeks; however, this alternative would result in a significant unavoidable impact to the capacity of the South Bristol Street roadway for a total of 109 days (or 89 days longer than the proposed Project's significant unavoidable impact). Furthermore, construction of a lift station at Alternative Site No. 19 would exacerbate an existing parking deficiency at this existing commercial retail building both during construction and long -term operation. Near- and long -term impacts to parking at Alternative Site No. 19 would be a significant and unmitigable impact. As such, impacts to traffic and circulation would be greater at Alternative Site No. 19 as compared to the proposed Project site. Total construction air quality /greenhouse gas emissions would be increased under this alternative due to a longer construction period, although average daily construction emissions would be similar to the proposed Project and would be less than significant. In addition, construction - related impacts to water quality and hydrology would be increased under this alternative due to a larger area of impact, although such impacts would be less than significant. As with the proposed Project, impacts associated with nighttime dewatering activities during construction would be reduced to less than significant levels with compliance with Mitigation Measure MM 3.3 -2. Long -term odor impacts associated with accident conditions would be slightly decreased under this alternative in comparison to the proposed Project and would be less than significant similar to the proposed Project. Impacts related to long -term noise, utilities and service systems, and water quality and hydrology (long -term) would be similar to the proposed Project and would be less than significant. San Lorenzo Lift Station EIR (Project No. 06 -3510) 3 -42 CEQA Findings of Fact/Statement of Overriding Considerations 55A -81