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Proposal 3573 - Reservoir Inspection and Cleaning As Needed Services for Utilities – Water… (RFP #PWD-24-601) City of Pleasanton Page 7 April 4, 2024 Priority 4 – work required in 5-7 years Priority 5 – no work required for 7-10+ years Since coatings are typically the only elements on a tank that substantially change, the lining and paint systems are the primary focus of the evaluation. Of course, if coatings are no longer performing well, significant corrosion may have developed, and this condition is most heavily weighted for priority. When developing recommendations, there are generally four possible approaches to maintenance coating. A coating can be either spot repaired, spot repaired and overcoated, or completely removed and replaced (recoated). The fourth approach is to defer any work because the coatings are either in excellent condition or are in a marginal condition with no significant corrosion. It would be best to let a marginal coating continue to degrade because no significant corrosion is present. Where economically feasible, spot repairs will extend the life of a coating by preventing small film defects from becoming larger ones (undercutting). Generally speaking, once defects in a tank approach a certain percent of the total surface area, the window of opportunity for any level of spot repair closes. Whereas the breaking point between the overcoat and recoating strategies arrives when the existing coating becomes weak, brittle, checked, and/or cracked to the point that it will not tolerate an additional coat. Once this point is reached and a simple maintenance overcoat window is closed, it would be economically prudent for the coating to live out its useful life, before proceeding with a complete recoat. This is an example of where significant cost-savings can be achieved through an experienced eye. AWWA recommends that a normal water tank interior be inspected on a 5-year interval, and if a tank is known to have maintenance concerns then a 3-year interval is recommended. Many tank owners budget to inspect each of the tanks in their system within this 3-5 year interval. As a tank is evaluated, its current condition is weighted against the other tanks’ conditions for a master list of priorities. An active TMP results in a working database that is the on-going plan for tank maintenance. Below is a rough crop of a picture of a portion of typical TMP compilation report. The report would have active links to archived tank reports and videos, all stored in a cloud based server. A small- portion snippet of some if the TMP data that we compiled into a master spreadsheet is the right. EXHIBIT A DocuSign Envelope ID: 127FE52A-CAEF-4879-B943-68F42EA8FF9D