55A - RESOLUTION CERTIFYING EIR SAN LORENZO SEWER LIFT STATION

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Chapter 3 Findings Regarding Project Alternatives Attachment "A" implementation of Construction Configurations B.1, B.2, C.1, and 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, 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, 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 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. 10 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. 3.4.12.2 Summary Comparison of Environmental Effects The environmental effects of constructing the proposed lift station at Alternative Site No. 10 in comparison to the proposed Project site are shown in Final EIR Table 5 -1 and described in detail in RDEIR Section 5.4.12. 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 33 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. Mitigation for left -turn movement disruptions is not available since the existing parcels along South Bristol Street have limited access points that cannot be replaced. Furthermore, construction of a lift station at Alternative Site No. 10 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. 10 would be a significant and unmitigable impact. As such, impacts to transportation /traffic would be greater at Alternative Site No. 10 as compared to the proposed Project site. All other direct and cumulative near -term impacts to transportation /traffic would be less than significant and similar to the proposed Project. This alternative also would result in an increase in the severity of the Project's significant long -term air quality impact because Alternative Site No. 10 is closer to nearby sensitive receptors than the proposed Project and would thereby have an increased potential to expose nearby odor - sensitive uses to substantial offensive odor levels during worst -case accident conditions. However, long -term odor impacts would be reduced to less than significant levels with incorporation of Mitigation Measure MM 3.1 -1. Although total construction air quality /greenhouse gas emissions would be increased under this alternative due to a slightly elongated construction period, impacts would be less than significant since average daily construction emissions would be below SCAQMD thresholds, as with San Lorenzo Lift Station EIR (Project No. 06 -3510) 3 -23 CEQA Findings of Fact/Statement of Overriding Considerations 55A -62