55A - RESOLUTION CERTIFYING EIR SAN LORENZO SEWER LIFT STATION

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Chapter 3 Findings Regarding Project Alternatives Attachment "A" The lift station that would be constructed at Alternative Site No. 11 would include a similar above- ground block structure as the proposed Project. In addition, the lift station at Alternative Site No. 11 would feature similar equipment and appurtenances as the proposed Project. This alternative would require the installation and operation of approximately 32 percent more underground sewer conveyance infrastructure than the proposed Project and it is anticipated that the duration of Construction Phase 11 would be increased by 16 work days (approximately three weeks) as compared to the Project. The construction schedule for this alternative would otherwise be similar to the 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, which has the potential to result in adverse effects to vehicular circulation. Specifically, 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 likely would require supporting the utilities from the top of the trench and /or the use of trench boxes /shields. Implementation of this alternative would otherwise be similar to the proposed Project during construction conditions. Development of a lift station at Alternative Site No. 11 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. 3.4.13.2 Summary Comparison of Environmental Effects The environmental effects of constructing the proposed lift station at Alternative Site No. 11 in comparison to the proposed Project site are shown in Final EIR Table 5 -1 and described in detail in RDEIR Section 5.4.13. This alternative would avoid the proposed Project's significant and unavoidable impact associated with Construction Configuration C.2; however, this alternative would create a significant and unmitigable near -term impact to transportation/traffic due to a LOS deficiency that would occur for approximately 36 days during construction, which is an increase in duration as compared to the twenty -five (25) days of construction during which the proposed Project would create a significant unavoidable impact to transportation /traffic at the South Bristol Street/West Segerstrom Avenue intersection. Significant and unavoidable impacts to transportation /traffic would also occur when construction activities disrupt left -turn movements, thereby diverting traffic to adjacent intersections or encouraging cut - through traffic in local neighborhoods; such impacts would not occur in association with the proposed Project. Furthermore, construction of a lift station at Alternative Site No. 11 would also result in inadequate parking capacity at an existing medical office building both during construction and long -term operation. Near- and long -term impacts to parking at Alternative Site No. 11 would be a significant and San Lorenzo Lift Station EIR (Project No. 06 -3510) 3 -25 CEQA Findings of Fact /Statement of Overriding Considerations 55A -64