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Proposal 3573 - Reservoir Inspection and Cleaning <br /> As Needed Services for Utilities – Water… (RFP #PWD-24-601) <br />City of Pleasanton <br />Page 5 <br /> <br /> <br /> <br /> <br /> April 4, 2024 <br />For the concrete tank, the surveys will investigate any area where rust or other corrosion <br />products are in evidence from reinforcing steel. Concrete will also be evaluated for excessive <br />efflorescence, erosion, cracking, spalling, etc. Any indications of leakage will be determined. <br /> <br />Any aluminum substrates, such as dome roofs will be evaluated for corrosion or chemical <br />attack (High chlorine vapors). Unique items on bolted tanks that can result in maintenance <br />concerns, such as fastener channels or stave plate gaskets will be a focus of the inspections. <br /> <br />Assessment Reports - The product of the above would be a written narrative and color <br />pictorial description of the condition of each tank along with specific recommendations for <br />coatings, cathodic protection, and structural considerations, where applicable. <br />Recommendations for maintenance work will be based on the level of corrosion and the <br />condition of tank coatings and CP systems. Assessments will be based on the amount of <br />change from the original tank design. The life expectancy of existing coating systems, as <br />well as the projected corrosion rates on the structure is used to determine the future <br />maintenance strategies. Recommendations for coatings work will be based on paint or <br />lining’s percentage of failure, ability to be recoated, suspected film heavy metal content, <br />estimated remaining life of the system(s); and/or concerns with any impressed current <br />cathodic protection system. <br /> <br />It should be clear that our cost proposal does not include a seismic analysis of a tank's ability <br />to structurally withstand a probable seismic event, nor does this scope include any <br />geotechnical/soils reports. The report will also include estimated repair costs (if applicable) <br />and prioritization for recommended work. A narrated video will also be included for the <br />underwater inspection. <br /> <br />Tank Cleaning - In order to provide a clear inspection of the tank bottoms, CSI will remove <br />the sediment from the reservoirs. Sediment will be removed with vacuum equipment using <br />diving technicians. The tanks can be left in service during the clean-out operations, but water <br />levels will need to be maintained at the highest water level in <br />order to provide the highest pumping efficiency. A normal <br />amount of sediment on a tank bottom is typically less than <br />one-quarter inch. The sediment will be discharged with a 100 <br />foot exit hose. It is assumed that any run-off will not enter <br />storm drains. Should a NPDES permit be required where <br />water run off may enter into a storm drain, it will be the tank <br />owner’s responsibility to acquire a permit. Uncontained slurry <br />(water and smaller fines) will be deposited to a predetermined <br />owner approved location adjacent to the tank. Discharge of sediment and slurry will be made <br />at the sole discretion of the owner. CSI will provide filter bags to contain heavy particulate <br />as requested, but it is not our intent to be responsible for the discharge of any slurry or waste <br />from the tank. <br /> <br />PLEASE NOTE: The above scope is what we routinely complete and are offering. Any <br />sediment collection, discharge, or disposal cost above and beyond the scope above will be <br />EXHIBIT A <br />DocuSign Envelope ID: 127FE52A-CAEF-4879-B943-68F42EA8FF9D