TETRA TECH, INC (2)-2020-065 - Laserfiche WebLink

Home Browse Search

UNDERSTANDING SCOPE OF SERVICES PROJECT UNDERSTANDING The City of Santa Ana is soliciting proposals for professional engineering services to conduct condition assessments, inspections, and testing and provide structural and seismic analysis of seven concrete potable water storage reservoirs. Identified deficiencies will be presented with prioritized alternatives for repair, retrofit or replacement to ensure these facilities continue to operate and provide water following a seismic event. The following reservoirs are included: Reservoir Name Size MG Size (feet) W x L x H Date Constructed Description Cambridge 1.3 112 x 112 x 19 1966 Conventional Rectangular Partially Buried Crooke 6.0 179 x 239 x 21 1976 Conventional Rectangular Buried Walnut 7.0 242 x 202 x 18 1956 Conventional Rectangular Buried John Garthe Rect. 5.8 200 x 133 x 35 1992 Prestressed Rectangular Partially Buried John Garthe Circ. 1 5.0 165 diameter x 34 2000 Prestressed Circular Partially Buried John Garthe Circ. II 5.0 165 diameter x 34 2000 Prestressed Circular Partially Buried South 6.0 1 219 diameter x 24.5 1 1965 Circular Precast "Pritzker" Above Grade Construction drawings appear to be available for all the reservoirs (in the "As Built Drawing" attachments provided as part of the RFP). PROJECT SCOPE AND APPROACH Based on our understanding of the City's objectives and needs, our project approach will focus on identifying deficiencies, formulating a prioritized list of improvements to correct deficiencies that have an impact on human life -safety, and estimating the associated cost to implement the improvements. The human life -safety assessment will consider City maintenance personnel and others who may have a need for access to the reservoirs, as well as members of the general public who live in the immediate vicinity of any of the reservoirs. Three factors are key to the life -safety assessment: • Loss of reservoir contents due to a breach —caused either by equipment failure, structural failure, pipe breakage or the like, particularly in the aftermath of an earthquake —may subject the immediate area to inundation, particularly in the case of an above -ground reservoir. This can impact the health and safety of not only the residents in the surrounding area but also the general public at large. • A reservoir rendered inoperable in a seismic event (for example, due to a roof collapse) will result in the lack of water for domestic consumption and/or fire -fighting. • Although arguably not as much of an immediate threat as a seismic event, a breach of site security leading to the contamination of the water supply could be an even greater threat to public safety. As such, site security will also be an area of focus in our project approach. Prioritization of non -life threatening improvements will be discussed with City staff during a draft report review workshop, based on their value/importance relative to human life -safety. With this approach serving as the framework for all of our efforts, the following is our proposed scope of services. Task 1: Project Management Kickoff Meeting The project kickoff meeting will be held in the City offices and will include all key personnel after we have had a chance to review all available drawings. Review of the existing drawings before we mobilize to perform our site reconnaissance efforts is essential for developing a "Field Investigation and Testing Plan." Tetra Tech will prepare an agenda and draft project schedule prior to the meeting. During the kickoff meeting, the scope of services, project schedule and communication protocols will be reviewed and finalized. Following the meeting, Tetra Tech will prepare and distribute meeting minutes and will update and distribute the final project schedule. CITY or SANTA ANA 5 TETRA TECH