During routine inspections, a field engineer discovers that one of the company’s pipelines is leaking hazardous chemicals into the environment but less than the reportable threshold. The engineer recommends that the line be shut down so that seals can be replaced and the pipe can be inspected more closely. His supervisor commends him on his thoroughness, and says the report will be passed on to the company’s maintenance division. The engineer moves on to his next job, assuming things will be taken care of in a timely manner. While working in the area again several months later, the engineer notices that the problem hasn’t been corrected and is in fact getting worse. What should the engineer do?