Except where necessary to conform with Washington state laws, rules, and regulations governing eligibility for benefits purchased through the state Health Care Authority, the County shall provide for the extension of County employee benefits to employees’ domestic partners and eligible children of the domestic partner on a basis equal to the benefits provided to employees for a spouse and eligible children of the spouse, subject to the terms and conditions of an Affidavit of Marriage/Domestic Partnership, to be developed and implemented by the Human Resources Department.