REDWOOD CITY, Calif. — A Stanford sailor arrived at the university’s gleaming boathouse to clean out her locker at the end of the school year. The doors would not open.

“Did they change the locks again?” she said with an air of exasperation.

It was a reasonable question. In March, when the sailing coach John Vandemoer was fired after being snared in a nationwide admissions scandal, the locks were changed at the Arrillaga Family Rowing and Sailing Center. In April, they were changed again, after the men’s rowing coach Craig Amerkhanian was mysteriously fired — late in the season, weeks before his planned retirement.

Stanford’s boating troubles stem from the work of William Singer, the private college consultant who collected millions of dollars in payments from wealthy parents and paid college coaches and athletic administrators to designate non-athletes as recruits for admissions purposes at elite universities. In some cases, the college coaches pocketed the money. In others, Singer, who goes by Rick, made donations to the athletic programs.

Stanford is investigating the scope of the wrongdoing. It has hired the law firm Simpson Thacher & Bartlett to review how its athletes are recruited and how athletics-related gifts are accepted.