Seattle City Employees Retirement System will issue RFPs for its entire domestic equity portfolio next week. The citys current domestic equity managers are: Oppenheimer, $123 million; Sirach, $108 million; American Express, $87 million; Dimensional, $73 million; Amerindo, $64 million; Barclays, $61 million; Rainier, $58 million; and NCM Capital, $35 million. The $1.6 billion system is required to put all managerial roles out to bid every five years, said Mel Robertson, acting executive director. The RFPs will be available only through consultant Wurts & Associates website, www.wurts.com. Proposals are due March 10.