Pleasanton is moving forward with a plan to build two new drinking-water wells to replace its wells found to be contaminated. The new wells would be drilled away from the ones contaminated with the potentially harmful per- and polyfluoroalkyl substances — known as PFAS — that caused the city to stop using the three wells it currently operates. The City Council this month approved moving forward with the project, which will take about four years to complete and cost an estimated $23 million to $43 million, according to city figures. However, city officials have not decided how to pay for the entire project. The City Council only committed $500,000 from the city’s water fund to cover planning and development costs.