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Remove samples of sealants, joint compounds, steel pipe coatings, and any other coatings <br />where appropriate, to determine if they contain lead, chromium or zinc in levels exceeding <br />allowable limits addressed in Title 22 of the California Code of Regulations. <br />Evaluate the condition of any observed concrete cracking or spalling, particularly in areas where <br />there may be exposed rebar. Mark and photograph non -hairline cracks (wide enough to stick a <br />dime in) using NSF 61-approved paint. <br />Note areas in each reservoir where corrosion is evident, especially where exposed rebar is <br />present. Determine whether existing sacrificial cathodic protection anodes in those areas are <br />sufficient to deter corrosion. If not, make appropriate recommendations for additional cathodic <br />protection, if warranted. <br />As part of this investigation, the Consultant shall conduct an initial assessment of visually <br />observable corrosion, and if warranted, perform the following tests to better define the extent of <br />the problem and make appropriate mitigation recommendations: <br />1. Electrical continuity tests using exposed reinforcing steel to record reinforcing steel -to - <br />concrete potentials . <br />2. Electrical resistivity tests to determine the voltage difference between existing exposed <br />rebar and other nearby sections of exposed rebar per ASTM C876. <br />3. Penetrating radar half -cell tests. <br />4. pH and chloride testing of spalled concrete or other samples that may be gathered if no <br />spalled concrete samples are present. <br />5. For partially buried reservoirs, consider soil sampling around the tanks to determine <br />potentials at the tank perimeter. <br />Task 4 — Engineering Services <br />The Consultant shall prepare a seismic, structural and corrosion and security assessment master <br />report of the concrete reservoirs. <br />Seismic & Structural Element: <br />The evaluations shall be site specific and include a full review of the original design plans for each <br />reservoir as well as take into consideration all conditions identified in Task 3. <br />The report shall include analysis of whether or not the reservoirs meet current civil, structural and <br />seismic design standards including ASCE 7 (Minimum Design Loads for Buildings and Other <br />Structures), ACI 318 (Building Code Requirements for Structural Concrete), ACI 350 (Code <br />City of Santa Ana - RFP 19-107 <br />ENGINEERING SERVICES FOR SEISMIC AND STRUCTURAL ASSESSMENT OF THE CITY'S POTABLE WATER <br />STORAGE RESERVOIRS <br />