The Sacramento area is again in the international spotlight as a major college admissions scam was uncovered yesterday by federal authorities. At the head of the scam, former Carmichael resident William Rick Singer, 58, now of Newport Beach, is listed as the owner of a private college-prep consulting firm called Edge College & Career Network. He pleaded guilty in federal court in Boston to multiple felony charges, represented by well-known Sacramento defense attorney Donald Heller. According to court records, Singer agreed to forfeit $3.4 million in cash plus various business holdings controlled by his nonprofit foundation. Two Folsom residentsA whoa ve worked for Singer also were charged: Steven Masera, 69, the accountant and financial officer at Edge; and Mikaela Sanford, 32, an employee at Edge and Singera s nonprofit organization, the Key Worldwide Foundation.