55A - SAN LORENZO SEWER LIFT STATION

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Chapter 3 Findings Regarding ProjectAiternathres Attachment "A° Station and associated pipelines through the parking would create significant confusion and safety issues for the public. Therefore, this alternative is rejected as infeasible because it would substantially interfere with and disrupt the medical and retail uses at this location. Further, unlike the proposed Project site where the City has an existing sewer easement, construction at this location would require the City to acquire private property to provide easements for proposed sewer lines. Finally, construction of the lift station at this location would replace currently developed, useable land, in contrast to the proposed Project site, which is vacant and undeveloped. 3.4.6 Alternative Site Location No. 4 (Alternative Site No. 4) 3.4.6.1 Summary of Alternative Site No. 4 Alternative Site Location Number 4 (Alternative Site No. 4) would involve the construction of a replacement lift station in an undeveloped field located behind 2402 South Bristol Street instead of at the proposed Project site. Alternative Site No. 4 is located approximately 0.45 -mile northwest of the proposed Project site. The location of Alternative Site No. 4 is depicted on Final EIR Figure 5 -1. The lift station that would be constructed at Alternative Site No. 4 would include a similar above- ground block structure as the proposed Project. In addition, the lift station at Alternative Site No. 4 would feature similar equipment and appurtenances as the proposed Project. This alternative would construct 108 percent more underground sewer conveyance infrastructure than the proposed Project, and it is anticipated that Construction Phase 11 would be increased by an additional 61 work days (approximately 12 weeks) as compared to the proposed Project. The construction schedule for this alternative would otherwise be similar to the proposed Project. This alternative would not require construction activities within the South Bristol Street/West Segerstrom Avenue intersection or beneath the existing paved right -of -way of West Segerstrom Avenue (east of South Bristol Street). Therefore, this alternative would not require the implementation of Construction Configurations B.1, B.2, C.1, or C.2. 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 Project (i.e., to the north of the existing Segerstrom Lift Station). Due to existing utility constraints beneath South Bristol Street, portions of this roadway would need to be closed to accommodate construction associated with this alternative. Specifically, this segment of South Bristol Street 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. Construction along this segment of South Bristol Street likely would require supporting the utilities using trench boxes or shields, which in turn would require a larger area of closure along South Bristol Street during construction. Implementation of this alternative would otherwise be similar to the proposed Project during construction conditions. Development of a lift station at Alternative Site No. 4 also would require the City to acquire private property to implement a temporary construction easement, accommodate the proposed lift station, and provide easements for proposed sewer lines, as the proposed lift station would be constructed in an undeveloped field located behind 2402 South Bristol Street. 3.4.6.2 Summary Comparison of Environmental Effects The environmental effects of constructing the proposed lift station at Alternative Site No. 4 in comparison to the proposed Project site are shown in Final EIR Table 5 -1 and described in detail in San Lorenzo Lift Station EIR (Project No. 06 -3510) CEQA Findings of Fact /Statement of Overriding Considerations 55A -51 3 -12