55A - RESOLUTION CERTIFYING EIR SAN LORENZO SEWER LIFT STATION

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Chapter 3 Findings Regarding Project Alternatives Attachment "A" 3.4.14 Alternative Site Location No. 12 (Alternative Site No. 12) 3.4.14.1 Summary of Alternative Site No. 12 Alternative Site Location Number 12 (Alternative Site No. 12) would involve the construction of a replacement lift station within the parking lot of an existing medical complex located at approximately 2701 South Bristol Street instead of at the proposed Project site. It should be noted that although construction of a replacement lift station at Alternative Site No. 12 could occur anywhere within the block bounded by South Bristol Street, Hemlock Way, Central Avenue, and Baker Street, with exception of the existing AutoZone use at the northwestern corner of the site and the existing residential uses abutting Baker Street, for purposes of analysis it is assumed that the replacement lift station would be constructed in the southwestern portion of the block (i.e., near the intersection of Hemlock and South Bristol). Alternative Site No. 12 is located approximately 0.15 - mile north of the proposed Project site. The location of Alternative Site No. 12 is depicted on Final EIR Figure 5 -1. The lift station that would be constructed at Alternative Site No. 12 would include a similar above- ground block structure as the proposed Project. In addition, the lift station at Alternative Site No. 12 would feature similar equipment and appurtenances as the proposed Project. This alternative would require the installation and operation of approximately 42 percent less underground sewer conveyance infrastructure than the proposed Project; however, 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, which would elongate the construction schedule. Due to these constraints, it is anticipated that the duration of Construction Phase 11 would be increased by two (2) work days (approximately 0.5 week) 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 the existing utility constraints beneath South Bristol Street (described above), 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. Implementation of this alternative would otherwise be similar to the proposed Project during construction conditions. Development of a lift station at Alternative Site No. 12 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. San Lorenzo Lift Station EIR (Project No. 06 -3510) 3 -27 CEQA Findings of Fact/Statement of Overriding Considerations 55A -66