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

Home Browse Search

Draft Report Review Workshop The in -person draft report review workshop will allow us to answer City question and comments. It will also allow the City provide input in terms of prioritizing the retrofit, which will help us prepare the final report. Progress Meetings We anticipate three meetings via teleconference to report project progress as needed or as requested by the City. Task 2: Preliminary Engineering Services Review Existing Information We will review all available existing information (reservoir as -built drawings, underwater inspection report and video, etc.) prior to the kickoff meeting and the commencement of field investigation and testing. This will provide background needed to develop our "Field Investigation and Testing Plan." Develop Field Investigation and Testing Plan At a minimum, the plan will describe investigation objectives, outline the proposed investigation methods, identify the testing procedures that will be utilized, and identify what entity will be conducting each test if any material testing necessary for the evaluation of the structure. Task 3: Field Inspection Services Our field investigation and testing will be conducted as outlined in our "Field Investigation and Testing Plan" (Task 2). To ensure the safety of our field investigation personnel and in accordance with Tetra Tech policy, we will prepare a health & safety plant that identifies anticipated safety hazards and corresponding precautions and personal safety equipment needed by field staff. Our work scope includes interior examination of selected „. reservoirs, all of which are permit -required confined spaces. All our field personnel entering any confined spaces will be equipped with the necessary safety equipment. At least one Tetra Tech Reservoir Evaluation Personal confined -space -trained inspection team member will serve as Protection Equipment (PPE) the entry supervisor/attendant at the entrance of all confined spaces. We will provide personnel qualified to serve in this role. All Tetra Tech and subconsultant staff who enter confined spaces will be trained in confined -space entry safety procedures prior to visiting the project site. Where interior examination and testing is required, the entrants will be equipped with safety PPE and an oxygen sensor. We assume that the tanks may be accessed using the existing interior and exterior ladders and that the tanks can accommodate standard personnel extraction tripods and winches. Our field investigation and testing will be performed by both Tetra Tech and our subconsultants. Two site visits will be performed for each reservoir (one full and one empty): • First site visit will be done when the reservoirs are full. o Examinations of the underside of roof structures will be performed by Tetra Tech structural engineers, with the reservoir filled to within 3.5 to 4 feet of the low point of the roof structure, with the aid of inflatable kayaks (2 kayaks/2 observers), to allow passage of each kayak and observer across the underside of the lowest roof beams but close enough to the roof structure to allow for up -close visual examination. • The second site visit will be done when the reservoirs are drained and the floor slabs are dry. o Tetra Tech structural engineer will examine all the reservoir structural components that cannot be observed during the first site visit. o Tetra Tech civil engineer will inspect the reservoir piping/appurtenances and perform safety and onsite security assessment. o Subconsultant Ninyo & Moore will perform on -site materials sampling (assumed three concrete cores per reservoir) and non-destructive material testing (Schmidt Hammer, ground penetration CITY OF SANTA ANA 6 TETRA TECH